Chemically strengthened glass-ceramics, cover glass, electronic device and glassware

Abstract

The application provides a chemically strengthened microcrystalline glass, a cover plate glass, an electronic device and a glass device, and belongs to the technical field of microcrystalline glass; through the high lithium content microcrystalline glass with a specific composition and taking lithium disilicate as a main crystal phase, after chemical strengthening treatment, specific stress characteristics are met, especially the relationship between the molar percentage content of ZrO2 in the microcrystalline glass and the stress characteristic relationship A meets specific requirements, that is, the range requirement of the relationship B is met, not only can the problem of "surface cracking" of the prepared chemically strengthened microcrystalline glass be effectively overcome, but also the chemically strengthened microcrystalline glass can be ensured to have high mechanical strength performance, and further the chemically strengthened microcrystalline glass can be ensured to have excellent damage resistance.

Description

Technical Field

[0001] This application relates to the field of glass-ceramic technology, and more particularly to a chemically strengthened glass-ceramic, cover glass, electronic equipment, and glass devices. Background Technology

[0002] As a solid material containing both microcrystalline and glassy phases, glass-ceramic exhibits superior overall strength compared to ordinary glass due to the numerous tiny crystals that hinder microcrack propagation. Currently, glass-ceramic is beginning to be used in electronic devices, such as as cover glass for portable electronic devices. Other applications include, but are not limited to, display screen covers, back covers, and camera protective covers.

[0003] Common crystalline phases in glass-ceramics include lithium monosilicate, lithium disilicate, lithidium feldspar, quartz, quartz solid solution, spinel, spodumene, nepheline, zirconium oxide, and others. Lithium disilicate (Li₂Si₂O₅) is an orthorhombic crystal based on a [Si₂O₅] tetrahedral array, with a flat or plate-like shape. Inside the glass-ceramic, lithium disilicate crystals often exhibit a randomly oriented, interlocking microstructure, which forces cracks to twist their path, thus inhibiting crack propagation and improving the strength and fracture toughness of the glass-ceramic. Simultaneously, lithium disilicate is also an ideal crystalline phase for preparing highly transparent glass-ceramics. Therefore, glass-ceramics with lithium disilicate as the main crystalline phase have significant application potential in the market for cover glass for electronic devices.

[0004] As cover glass for electronic devices, especially for portable electronic devices (such as mobile phones, tablets, smartwatches, and smart bracelets), in addition to strength, it is desirable for the microcrystalline glass used as cover glass in portable electronic devices to be as thin as possible. In order to obtain high strength performance in the thinnest microcrystalline glass so as to better cope with problems such as extrusion, impact, scratches, and wear, chemical strengthening treatment is usually required for microcrystalline glass.

[0005] Since lithium is an essential component of the lithium disilicate crystalline phase, and lithium ions are the key ions for ion exchange during the chemical strengthening process of lithium disilicate glass-ceramics, in order to obtain lithium disilicate glass-ceramics that can be strengthened and have a high crystalline phase content, while ensuring that the strengthened glass-ceramics obtain a high stress level, it is usually considered to add a large amount of lithium to the glass composition. Summary of the Invention

[0006] Without any theoretical limitations, when chemically strengthening glass-ceramics with high lithium content and lithium disilicate as the main crystalline phase are subjected to chemical strengthening treatment in a molten salt bath, especially at high temperatures, a large number of irregular cracks / fissures easily appear on the surface of the resulting chemically strengthened glass-ceramics. These cracks / fissures exist on the surface of the chemically strengthened glass-ceramics and have a depth between 10μm and 100μm, and are referred to as "surface cracking" below. The "surface cracking" problem in chemically strengthened glass-ceramics leads to a significant reduction in its drop resistance and mechanical strength. More seriously, it can even cause the surface of the chemically strengthened glass-ceramics to fail directly due to the excessive number of cracks / fissures, rendering it unusable.

[0007] Furthermore, the inventors discovered that when chemically strengthening microcrystalline glass with high lithium content and lithium disilicate as the main crystalline phase to prepare chemically strengthened microcrystalline glass with desired properties, the compatibility between the glass composition and the stress distribution structure is very important. If the two are not compatible, the chemically strengthened microcrystalline glass is prone to "surface cracking," which greatly reduces its mechanical strength. However, when a microcrystalline glass with a specific composition is matched with a suitable and superior stress distribution structure, not only can the problem of "surface cracking" in the chemically strengthened microcrystalline glass be overcome, but the high mechanical strength of the chemically strengthened microcrystalline glass can also be ensured.

[0008] This application provides a chemically strengthened microcrystalline glass and a cover glass, electronic device and glass device containing the chemically strengthened microcrystalline glass. The chemically strengthened microcrystalline glass has a high lithium content, with lithium disilicate as the main crystalline phase, and has a specific composition and a specific stress distribution structure, so that the chemically strengthened microcrystalline glass not only does not have the problem of "surface cracking", but also has high mechanical strength properties.

[0009] Specifically, the technical solution provided in this application includes:

[0010] In a first aspect, a chemically strengthened glass-ceramic is provided, wherein the main crystalline phase of the chemically strengthened glass-ceramic is lithium disilicate; the crystallinity of the chemically strengthened glass-ceramic is not less than 65%; and the Li2O content at the center of the chemically strengthened glass-ceramic is not less than 11% by mass percentage of oxides.

[0011] The chemically strengthened glass-ceramic has a compressive stress layer on its surface and a tensile stress layer inside; the chemically strengthened glass-ceramic satisfies the following relationship:

[0012]

[0013] B = A - 83989 × n(ZrO2) 2+2526.5×n(ZrO2), 130≤B≤180, preferably, 135≤B≤180, more preferably 135≤B≤175;

[0014] Where t is the depth from the main surface of the chemically strengthened glass-ceramic, and CS(t) is the compressive stress value at depth t. The stress integral of the compressive stress layer from the main surface of the chemically strengthened glass-ceramic to DOL_0 is expressed in MPa·μm.

[0015] DOL_0 represents the depth of the compressive stress layer, in μm.

[0016] In relation A, the data is substituted according to the above unit requirements to perform calculations and obtain the results; the units are not involved in the calculation.

[0017] n(ZrO2) is the molar percentage content of ZrO2 at the center of the chemically strengthened microcrystalline glass;

[0018] In relation B, the values ​​from relation A and the molar percentage of ZrO2 are substituted into the equation to perform the calculation and obtain the result. Units are not involved in the calculation.

[0019] This application enables the chemically strengthened glass-ceramics with a specific composition and a lithium disilicate as the main crystalline phase to meet specific stress characteristics, particularly by ensuring that the molar percentage content of ZrO2 in the glass-ceramics and the stress characteristic relationship A meet specific requirements (i.e., meet the range requirements of the aforementioned relationship B). This not only effectively overcomes the problem of "surface cracking" in the chemically strengthened glass-ceramics, but also ensures that the chemically strengthened glass-ceramics have high mechanical strength properties, thereby ensuring that the chemically strengthened glass-ceramics have excellent damage resistance.

[0020] In some embodiments of this application, the value of relation A satisfies: 120≤A≤250, preferably 130≤A≤240, and more preferably 130≤A≤235. By making the chemically strengthened glass crystal satisfy relation A, it is beneficial to obtain the desired high stress level of the chemically strengthened glass crystal, thereby ensuring that the chemically strengthened glass crystal has high mechanical strength properties.

[0021] In some embodiments of this application, the value of relation A is: 150.39, 155.13, 157.8, 163.95, 165.23, 167.78, 171.98, 130.02, 148.08, 153.52, 157.87, 150.70, 161.51, 200.59, 217.59, 234.24, 208.06, 207.14, 220.07, 224.21, or 226.66; and / or,

[0022] The values ​​of relation B are: 144.41, 149.14, 151.82, 157.96, 159.24, 161.80, 166.00, 148.99, 165.83, 168.65, 170.67, 163.85, 155.53, 136.18, 155.43, 172.09, 147.01, 147.17, 165.17, 164.24, or 166.69.

[0023] In some embodiments of this application, the chemically strengthened glass-ceramic satisfies the following relationship: C = A - |CT_AV|, 30 ≤ C ≤ 90, preferably 30 ≤ C ≤ 85, more preferably 30 ≤ C ≤ 80, where |CT_AV| is the absolute value of the average tensile stress in MPa. By ensuring that the chemically strengthened glass-ceramic satisfies relationship C, it helps to overcome the problem of "surface cracking" in the prepared chemically strengthened glass-ceramic and helps to ensure that the chemically strengthened glass-ceramic has high mechanical strength properties.

[0024] In some embodiments of this application, the value of relation C is: 33.97, 40.28, 37.3, 41.41, 47.67, 42.93, 45.51, 45.77, 52.74, 53.28, 51.42, 52.28, 37.27, 64.74, 70.95, 77.45, 57.85, 52.49, 67.32, 66.26, or 64.31.

[0025] In some embodiments of this application, the chemically strengthened glass crystal satisfies the following relationship: 2.0 ≤ |K 0.5×DOL_0 |≤6.0, where |K 0.5×DOL_0 |The absolute value of the slope of the stress curve at a depth t = 0.5 × DOL_0 from the main surface of the chemically strengthened glass-ceramic.

[0026] In some embodiments of this application, the chemically strengthened glass-ceramic satisfies: 0 ≤ M(K2O) ≤ 1.5%, 5% ≤ M(Na2O) ≤ 25%; M(K2O) is the mass percentage of K2O on the surface of the chemically strengthened glass-ceramic, and M(Na2O) is the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic.

[0027] In some embodiments of this application, after reducing the thickness of each of the two main surfaces of the chemically strengthened glass-ceramic by 3 μm, the resulting chemically strengthened glass-ceramic satisfies the following: the mass percentage of K2O M'(K2O) on the surface of the chemically strengthened glass-ceramic and the mass percentage of Na2O M'(Na2O) on the surface of the chemically strengthened glass-ceramic are: 0 ≤ M'(K2O) ≤ 0.5%, 4.0% ≤ M'(Na2O) ≤ 20%.

[0028] In some embodiments of this application, the composition at the center of the chemically strengthened glass crystal, based on the molar percentage of oxides, comprises:

[0029] SiO2: 58%–66%, Al2O3: 0%–3.5%, P2O5: 1%–3%, ZrO2: 1%–6%, Li2O: 24%–32%. In this application, by adjusting and controlling the content range of each oxide component, it is beneficial to ensure that chemically strengthened microcrystalline glass that meets the desired crystal phase structure and stress structure is obtained.

[0030] In some embodiments of this application, the composition at the center of the chemically strengthened glass-ceramic, based on the molar percentage of oxides, further comprises: SrO: 0%–3%, and / or, Na₂O: 0%–4%, and / or, K₂O: 0%–2%, and / or, CaO: 0%–5%, and / or, B₂O₃: 0%–1%, and / or, Ta₂O₅: 0%–1%, and / or, BaO: 0%–3%, and / or, MgO: 0%–3%, and / or, ZnO: 0%–3%, and / or, Y₂O₃: 0%–1%, and / or, La₂O₃: 0%–1%, and / or, Yb₂O₃: 0%–1%.

[0031] In some embodiments of this application, the composition at the center of the chemically strengthened glass crystal, based on the molar percentage of oxides, comprises:

[0032] The molar percentage of SiO2 is 60%–65%, preferably 60.5%–64.50%; and / or,

[0033] The molar percentage of Al2O3 is 0.5% to 3.5%, preferably 1% to 1.5%; and / or,

[0034] The molar percentage of P2O5 is 1% to 2.8%, preferably 1.20% to 2%; and / or,

[0035] The molar percentage of ZrO2 is 1% to 5%, preferably 1.4% to 5%; and / or,

[0036] The molar percentage of Li2O is 24%–31.6%, preferably 27.5%–31%; and / or,

[0037] The molar percentage of Na2O is 0% to 3%, preferably 0% to 1%; and / or,

[0038] The molar percentage of K2O is 0% to 1%, preferably 0% to 0.7%; and / or,

[0039] The molar percentage of CaO is 0% to 4%, preferably 0% to 3%; and / or,

[0040] The molar percentage of BaO is 0% to 2%, preferably 1% to 2%; and / or,

[0041] The molar percentage of SrO is 0% to 2%, preferably 1% to 2%; and / or,

[0042] The molar percentage of MgO is 0% to 2%; and / or,

[0043] The molar percentage of ZnO is 0% to 2%; and / or,

[0044] The molar percentage of B2O3 is 0% to 0.7%, preferably 0% to 0.5%; and / or,

[0045] The molar percentage of Y₂O₃ is 0% to 0.5%, preferably 0% to 0.2%; and / or,

[0046] The molar percentage of La2O3 is 0% to 0.5%, preferably 0% to 0.2%; and / or,

[0047] The molar percentage of Ta2O5 is 0% to 0.7%, preferably 0% to 0.5%; and / or,

[0048] The molar percentage of Yb₂O₃ is 0% to 0.7%, preferably 0% to 0.5%.

[0049] In this application, the appropriate addition of alkaline earth metal oxides such as BaO, SrO, MgO, and CaO is beneficial for improving the glass melting process, making it less prone to crystallization during glass melting, and to some extent, reducing high-temperature viscosity, increasing the density of the substrate glass, increasing Young's modulus, and also enabling the glass to achieve higher stress after strengthening. The appropriate addition of rare earth metal oxides such as Y₂O₃, La₂O₃, and Yb₂O₃ can increase the density of the substrate glass and improve the Young's modulus of the glass-ceramic. The appropriate addition of transition metal oxides such as Ta₂O₅ can also increase the density of the substrate glass and improve the Young's modulus of the glass-ceramic. The appropriate addition of alkali metal oxides such as Na₂O and K₂O can improve the glass melting process, but it will reduce the stress of chemically strengthened glass-ceramics.

[0050] In some embodiments of this application, the composition at the center of the chemically strengthened glass crystal, based on the molar percentage of oxides, comprises:

[0051] The molar percentage of SiO2 is 60.92%, 60.94%, 61.15%, 61.16%, 61.43%, 61.72%, 61.82%, 62.58%, 62.77%, 63.16%, 63.39%, or 63.86%; and / or,

[0052] The molar percentage of Al2O3 is 1.14%, 1.22%, 1.23%, 1.37%, 1.38%, 1.4%, 1.42%, 1.43%, or 1.44%; and / or,

[0053] The molar percentage of P2O5 is 1.51%, 1.74%, 1.83%, 1.84%, 1.85%, 1.86%, 1.87%, 1.89%, or 1.92%; and / or,

[0054] The molar percentage of ZrO2 is 1.44%, 1.89%, 2.18%, 2.34%, 2.36%, 3.23%, 4.47%, 4.57%, 4.59%, 4.61%, or 4.66%; and / or,

[0055] The molar percentages of Li₂O are 27.54%, 29.25%, 29.38%, 29.52%, 29.8%, 30.22%, 30.4%, 30.44%, 30.81%, or 31.51%; and / or,

[0056] The molar percentage of Na₂O is 0% or 0.3%; and / or,

[0057] The molar percentage of K2O is 0% or 0.46%; and / or,

[0058] The molar percentage of CaO is 0%, 0.92%, or 2.67%; and / or,

[0059] The molar percentage of BaO is 0%, 0.91%, 1.38%, or 1.83%; and / or,

[0060] The molar percentage of SrO is 0%, 0.91%, 0.92%, 1.38%, 1.42%, or 1.83%; and / or,

[0061] The molar percentage of MgO is 0%, 0.2%, or 1.83%; and / or,

[0062] The molar percentage of ZnO is 0%, 0.54%, or 1.67%; and / or,

[0063] The molar percentage of B2O3 is 0% or 0.46%; and / or,

[0064] The molar percentage of Y₂O₃ is 0% or 0.2%, and / or,

[0065] The molar percentage of La2O3 is 0% or 0.2%; and / or,

[0066] The molar percentage of Ta2O5 is 0%, 0.46%, or 0.5%; and / or,

[0067] The molar percentage of Yb₂O₃ is 0% or 0.46%.

[0068] In some embodiments of this application, the chemically strengthened glass crystal satisfies:

[0069] 2.00≤n(SiO2) / n(Li2O)≤2.40, preferably, 2.00≤n(SiO2) / n(Li2O)≤2.30, more preferably, 2.02≤n(SiO2) / n(Li2O)≤2.20, wherein n(SiO2) and n(Li2O) are the molar percentage contents of SiO2 and Li2O at the center of the chemically strengthened microcrystalline glass, respectively; and / or,

[0070] 90% ≤ n(SiO2) + n(Li2O) ≤ 96%, preferably 90% ≤ n(SiO2) + n(Li2O) ≤ 95%, wherein n(SiO2) and n(Li2O) are the molar percentage contents of SiO2 and Li2O at the center of the chemically strengthened microcrystalline glass, respectively; and / or,

[0071] 20% ≤ 2.25 × n(Li₂O) - 8 × n(ZrO₂) - 0.2 × n(CaO) ≤ 60%, preferably 25% ≤ 2.25 × n(Li₂O) - 8 × n(ZrO₂) - 0.2 × n(CaO) ≤ 60%, wherein n(Li₂O), n(ZrO₂), and n(CaO) are the molar percentage contents of Li₂O, ZrO₂, and CaO at the center of the chemically strengthened microcrystalline glass, respectively; and / or,

[0072] 0% ≤ n(Y₂O₃) + n(La₂O₃) + n(Ta₂O₅) + n(Yb₂O₃) ≤ 1%, preferably, 0% ≤ n(Y₂O₃) + n(La₂O₃) + n(Ta₂O₅) + n(Yb₂O₃) ≤ 0.7%, wherein n(Y₂O₃), n(La₂O₃), n(Ta₂O₅), and n(Yb₂O₃) are the molar percentage contents of Y₂O₃, La₂O₃, Ta₂O₅, and Yb₂O₃ at the center of the chemically strengthened microcrystalline glass, respectively; and / or,

[0073] 0% ≤ n(SrO) + n(BaO) + n(CaO) + n(MgO) ≤ 3%, preferably 0% ≤ n(SrO) + n(BaO) + n(CaO) + n(MgO) ≤ 2.7%, wherein n(SrO), n(BaO), n(CaO), and n(MgO) are the molar percentage contents of SrO, BaO, CaO, and MgO at the center of the chemically strengthened microcrystalline glass, respectively; and / or,

[0074] 0 ≤ n(SrO) / [n(SrO)+n(BaO)+n(CaO)+n(MgO)] ≤ 1, where n(SrO), n(BaO), n(CaO), and n(MgO) are the molar percentage contents of SrO, BaO, CaO, and MgO at the center of the chemically strengthened glass-ceramic, respectively. In this application, by adjusting and controlling the content relationship of each oxide, it is beneficial to ensure that a glass-ceramic with lithium disilicate as the main crystalline phase structure that meets the desired performance is obtained, while also facilitating the realization of the desired stress distribution structure.

[0075] In some embodiments of this application, the chemically strengthened glass crystal satisfies:

[0076] The value of n(SiO2) / n(Li2O) is 2.01, 2.03, 2.07, 2.08, 2.09, 2.10, or 2.28, where n(SiO2) and n(Li2O) are the molar percentage contents of SiO2 and Li2O at the center of the chemically strengthened microcrystalline glass, respectively; and / or,

[0077] The values ​​of n(SiO2)+n(Li2O) are 90.17%, 90.19%, 90.31%, 90.4%, 90.41%, 90.81%, 91.24%, 91.62%, 92.16%, 93.38%, 93.39%, 94.26%, or 94.9%, where n(SiO2) and n(Li2O) are the molar percentage contents of SiO2 and Li2O at the center of the chemically strengthened microcrystalline glass, respectively; and / or,

[0078] The values ​​of 2.25×n(Li₂O)-8×n(ZrO₂)-0.2×n(CaO) are 29.39%, 29.77%, 30.05%, 42.65%, 43.99%, 50.6%, 52.02%, 52.88%, or 56.88%, respectively, where n(Li₂O), n(ZrO₂), and n(CaO) are the molar percentage contents of Li₂O, ZrO₂, and CaO at the center of the chemically strengthened microcrystalline glass, respectively; and / or,

[0079] The values ​​of n(Y₂O₃)+n(La₂O₃)+n(Ta₂O₅)+n(Yb₂O₃) are 0%, 0.2%, 0.46%, or 0.7%, where n(Y₂O₃), n(La₂O₃), n(Ta₂O₅), and n(Yb₂O₃) are the molar percentage contents of Y₂O₃, La₂O₃, Ta₂O₅, and Yb₂O₃ at the center of the chemically strengthened microcrystalline glass, respectively; and / or,

[0080] The values ​​of n(SrO)+n(BaO)+n(CaO)+n(MgO) are 0%, 0.2%, 0.92%, 1.38%, 1.42%, 1.83%, or 2.67%, where n(SrO), n(BaO), n(CaO), and n(MgO) are the molar percentage contents of SrO, BaO, CaO, and MgO at the center of the chemically strengthened microcrystalline glass, respectively; and / or,

[0081] The value of n(SrO) / [n(SrO)+n(BaO)+n(CaO)+n(MgO)] is 0, 0.5 or 1, where n(SrO), n(BaO), n(CaO) and n(MgO) are the molar percentage contents of SrO, BaO, CaO and MgO at the center of the chemically strengthened microcrystalline glass, respectively.

[0082] In some embodiments of this application, the composition at the center of the chemically strengthened glass crystal, based on the mass percentage of oxides, comprises:

[0083] SiO2: 55% to 75%, Al2O3: 0% to 6%, P2O5: 2% to 8%, ZrO2: 3% to 12%, Li2O: 11% to 20%.

[0084] In some embodiments of this application, the composition at the center of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, further comprises: SrO: 0%–6%, and / or, Na2O: 0%–4%, and / or, K2O: 0%–2%, and / or, CaO: 0%–5%, and / or, B2O3: 0%–1%, and / or, Ta2O5: 0%–2%, and / or, BaO: 0%–6%, and / or, MgO: 0%–3%, and / or, ZnO: 0%–3%, and / or, Y2O3: 0%–2%, and / or, La2O3: 0%–2%, and / or, Yb2O3: 0%–4%.

[0085] In some embodiments of this application, the composition at the center of the chemically strengthened glass crystal, based on the mass percentage of oxides, comprises:

[0086] The mass percentage of SiO2 is 60%–71%, preferably 62%–68%; and / or,

[0087] The mass percentage of Al2O3 is 1% to 6%, preferably 1% to 3%, more preferably 2% to 3%; and / or,

[0088] The mass percentage of P2O5 is 3% to 6%, preferably 3.5% to 5.5%; and / or,

[0089] The ZrO2 mass percentage is 4% to 11%, preferably 4% to 10%; and / or,

[0090] The mass percentage of Li2O is 11% to 18%, preferably 12% to 17.5%, more preferably 14% to 17%; and / or,

[0091] The mass percentage of Na2O is 0% to 2.8%, preferably 0% to 1%; and / or,

[0092] The mass percentage of K2O is 0% to 1.5%, preferably 0% to 1%; and / or,

[0093] The mass percentage of CaO is 0% to 3%, preferably 0% to 1%; and / or,

[0094] The mass percentage of BaO is 0% to 5.5%, more preferably 0% to 5%; and / or,

[0095] The mass percentage of SrO is 0% to 5%, preferably 0% to 3.5%; and / or,

[0096] The mass percentage of MgO is 0% to 2%; and / or,

[0097] The ZnO mass percentage is 0% to 2.5%; and / or,

[0098] The mass percentage of B2O3 is 0% to 0.8%, preferably 0% to 0.5%; and / or,

[0099] The mass percentage of Y2O3 is 0% to 1%, preferably 0% to 0.8%; and / or,

[0100] The mass percentage of La2O3 is 0% to 1.5%, preferably 0% to 1%; and / or,

[0101] The mass percentage of Ta2O5 is 0% to 1.5%, preferably 0% to 0.5%; and / or,

[0102] The mass percentage of Yb2O3 is 0% to 3.5%, preferably 0% to 3%.

[0103] In some embodiments of this application, the crystallinity of the chemically strengthened glass-ceramic is 70%–90%, more preferably, the crystallinity of the chemically strengthened glass-ceramic is 70%–87%; and / or,

[0104] In the chemically strengthened glass-ceramic, the average grain size does not exceed 100 nm, preferably, the average grain size does not exceed 50 nm, more preferably, the average grain size is 15 nm to 30 nm; and / or,

[0105] In the chemically strengthened glass-ceramic, the lithium disilicate crystalline phase accounts for 80 wt% to 100 wt% of all crystalline phases; and / or,

[0106] The mass percentage of the lithium feldspar crystal phase in the chemically strengthened glass-ceramic is less than or equal to 10%, preferably less than or equal to 5%, and more preferably, it contains no lithium feldspar crystal phase. This application, by enabling the glass-ceramic to meet desired crystallinity and / or desired phase composition and / or appropriate average grain size, facilitates the maintenance of excellent optical properties while satisfying excellent mechanical strength and high intrinsic strength.

[0107] In some embodiments of this application, when the thickness is no more than 0.70 mm, the b-value of the chemically strengthened microcrystalline glass is <1.0, preferably <0.8, more preferably b-value ≤0.6; and / or,

[0108] The chemically strengthened glass-ceramic is transparent in the visible light wavelength range. Preferably, for 550nm wavelength light, the transmittance of the chemically strengthened glass-ceramic is ≥85%, more preferably ≥90%, and even more preferably ≥90.27%. Chemically strengthened glass-ceramics that meet these b-values ​​and / or transmittance requirements can ensure good display and transparency effects, making them suitable for use in electronic device displays where display quality is crucial.

[0109] In some embodiments of this application, the chemically strengthened glass-ceramic has a Young's modulus greater than 100 GPa, preferably greater than 105 GPa, and more preferably 110 GPa to 130 GPa; and / or,

[0110] The density of the chemically strengthened microcrystalline glass is 2.51 g / cm³. 3 ~2.65g / cm 3 ; and / or,

[0111] The refractive index of the chemically strengthened microcrystalline glass is ≤1.60, preferably 1.54 to 1.60; and / or,

[0112] The thickness T of the chemically strengthened microcrystalline glass is 0.35 mm to 1.0 mm, preferably 0.4 mm to 0.7 mm, and more preferably 0.45 mm to 0.55 mm; and / or,

[0113] The chemically strengthened glass-ceramic is 2D, 2.5D, 3D, or irregularly shaped; and / or, the chemically strengthened glass-ceramic is of uniform or non-uniform thickness. Young's modulus, density, and refractive index within the above ranges indicate that the chemically strengthened glass-ceramic possesses high intrinsic strength, which is beneficial for achieving excellent mechanical strength and excellent damage resistance.

[0114] In some embodiments of this application, the chemically strengthened glass crystal satisfies:

[0115] 0.20≤DOL_0 / T≤0.25, preferably, 0.21≤DOL_0 / T≤0.23, where DOL_0 is the compressive stress layer depth and T is the thickness of the chemically strengthened glass-ceramic; and / or,

[0116] 90.00μm≤DOL_0≤160.00μm, preferably 100.00μm≤DOL_0≤160.00μm, where DOL_0 is the compressive stress layer depth; and / or,

[0117] 100.00MPa≤CS_50≤300.00MPa, preferably, 110.00MPa≤CS_50≤250.00MPa, more preferably, 110.00MPa≤CS_50≤240.00MPa, wherein CS_50 refers to the compressive stress value at a depth of 50μm measured from the main surface of the chemically strengthened glass-ceramic; and / or,

[0118] 80.00MPa≤|CT_AV|≤200.00MPa, preferably, 80.00MPa≤|CT_AV|≤170.00MPa, more preferably, 80.00MPa≤|CT_AV|≤160.00MPa, where |CT_AV| is the absolute value of the average tensile stress; and / or,

[0119] The stress distribution is 40000.00 MPa / mm ≤ CT_LD ≤ 100000.00 MPa / mm, preferably 47000.00 MPa / mm ≤ CT_LD ≤ 95000.00 MPa / mm, where CT_LD refers to the tensile stress linear density. This application, by enabling chemically strengthened glass-ceramics to meet suitable stress characteristics, facilitates the acquisition of chemically strengthened glass-ceramic products with high stress levels. This, in turn, allows the stress characteristics to improve mechanical strength properties, ensuring that the chemically strengthened glass-ceramics do not suffer from surface cracking while achieving excellent damage resistance.

[0120] In some embodiments of this application, the chemically strengthened microcrystalline glass is subjected to a sandpaper drop test using 80-grit sandpaper. When the thickness does not exceed 0.70 mm, the average sandpaper drop resistance height of the chemically strengthened microcrystalline glass is ≥1.0 m, preferably ≥1.2 m, and more preferably ≥1.6 m. A higher measured average sandpaper drop resistance height indicates better drop damage resistance of the chemically strengthened microcrystalline glass.

[0121] In a second aspect, a glass device is provided, comprising a chemically strengthened microcrystalline glass as described in any embodiment of the first aspect.

[0122] Thirdly, a cover glass is provided, comprising chemically strengthened microcrystalline glass as described in any embodiment of the first aspect. The cover glass may be a display screen cover, back cover, or camera protection cover for an electronic device.

[0123] Fourthly, an electronic device is provided, comprising chemically strengthened microcrystalline glass as described in any embodiment of the first aspect.

[0124] In some embodiments of this application, the electronic device includes a housing assembled on the outside of the electronic device, the housing comprising chemically strengthened microcrystalline glass as described in any embodiment of the first aspect.

[0125] In some embodiments of this application, the housing includes a display cover assembled on the front side of the electronic device, the display cover comprising chemically strengthened microcrystalline glass as described in any embodiment of the first aspect.

[0126] In some embodiments of this application, the housing includes a back cover assembled to the rear of the electronic device, the back cover comprising chemically strengthened microcrystalline glass as described in any embodiment of the first aspect.

[0127] In some embodiments of this application, the electronic device further includes a camera assembly located inside a housing, the housing including a camera protective cover covering the camera assembly, the camera protective cover comprising chemically strengthened microcrystalline glass as described in any embodiment of the first aspect.

[0128] In some embodiments of this application, the electronic device further includes a mid-frame located between the display module and the housing, the mid-frame comprising chemically strengthened microcrystalline glass as described in any embodiment of the first aspect.

[0129] In some embodiments, the outer casing may be partially or entirely made of chemically strengthened microcrystalline glass. The electronic device in this application may have one or more components, such as the display screen cover, back cover, camera protective cover, and mid-frame, made of chemically strengthened microcrystalline glass as described in any embodiment of the first aspect.

[0130] One or more of the technical solutions provided in this application have the following advantages compared with the prior art:

[0131] This application achieves specific stress characteristics by chemically strengthening a high-lithium-content glass-ceramic with lithium disilicate as the main crystalline phase. In particular, it ensures that the molar percentage content of ZrO2 in the glass-ceramic and the stress characteristic relationship A meet specific requirements (i.e., meet the range requirements of the aforementioned relationship B). This not only effectively overcomes the problem of "surface cracking" in the chemically strengthened glass-ceramic but also ensures that the chemically strengthened glass-ceramic has high mechanical strength properties, thereby ensuring that the chemically strengthened glass-ceramic has excellent damage resistance. Attached Figure Description

[0132] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It should be understood that the following drawings illustrate only certain embodiments of this application and should not be construed as limiting the scope of this application.

[0133] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0134] Figure 1 This is a photograph of the chemically strengthened microcrystalline glass of Example 1 of this application under strong light.

[0135] Figure 2 A photograph of the chemically strengthened microcrystalline glass of Comparative Example 5 of this application under strong light;

[0136] Figure 3 This is a 2D micrograph of the main surface of the chemically strengthened glass-ceramic of Example 1 of this application, magnified 200 times.

[0137] Figure 4 This is a 2D micrograph of the main surface of the chemically strengthened glass-ceramic of Comparative Example 5 of this application, magnified 100 times.

[0138] Figure 5 This is a 2D micrograph magnified 200 times of the cross-section along the thickness direction of the chemically strengthened microcrystalline glass of Example 1 of this application after it has been broken;

[0139] Figure 6 This is a 2D micrograph magnified 200 times of the cross-section along the thickness direction of the chemically strengthened glass-ceramic of Comparative Example 5 of this application after it was broken;

[0140] Figure 7This diagram illustrates the test location for stress testing using the SLP-2000 on a sample according to an embodiment of this application. The test point is located at the exact center of the sample. In the diagram, 7-a represents the edge of the main surface of the sample, 7-b represents the main surface area of ​​the sample, and 7-c represents the area where the stress test point is located.

[0141] Figure 8 This is a schematic diagram of the test location for stress testing using the SLP-2000 on the comparative sample of this application. The test point is located at the exact center of the sample, and there is no "surface cracking" problem at the test point. Among them, 8-a is the edge of the main surface of the sample, 8-b is the "surface cracking" area of ​​the sample, 8-c is the area where the stress test point is located, and 8-d is the area of ​​the sample without "surface cracking".

[0142] Figure 9 The optical transmittance curve of the chemically strengthened microcrystalline glass of Example 1 of this application in the visible light wavelength range;

[0143] Figure 10 The XRD pattern of the glass-ceramic of Example 1 of this application;

[0144] Figure 11 The images show the XRD patterns of the glass-ceramic in Example 1 of this application before and after chemical strengthening, where A0 is the XRD pattern of the glass-ceramic before chemical strengthening and A1 is the XRD pattern of the chemically strengthened glass-ceramic obtained after chemical strengthening.

[0145] Figure 12 The XRD patterns of the microcrystalline glass of Comparative Example 5 of this application are shown in comparison. B0 is the XRD pattern of the microcrystalline glass before chemical strengthening, and B1 is the XRD pattern of the chemically strengthened microcrystalline glass after chemical strengthening.

[0146] Figure 13 Stress distribution diagram of the chemically strengthened glass-ceramic of Example 15 of this application, tested with SLP-2000;

[0147] Figure 14 Stress distribution diagram of the chemically strengthened glass-ceramic of Comparative Example 8 of this application, tested with SLP-2000;

[0148] Figure 15 This is a schematic diagram of the front structure of the electronic device mentioned in the embodiments of this application;

[0149] Figure 16 This is a schematic diagram of the rear structure of the electronic device mentioned in the embodiments of this application;

[0150] Figure 17 This is a schematic diagram of the structure of the electronic device mentioned in the embodiments of this application. Figure 1 ;

[0151] Figure 18This is a schematic diagram of the structure of the electronic device mentioned in the embodiments of this application. Figure 2 ;

[0152] Figure 19 This is a schematic diagram of the structure of the chemically strengthened glass-ceramic of this application, where d is the depth of the compressive stress layer, 21 is the compressive stress layer, and 22 is the tensile stress layer.

[0153] Reference numerals: 1-Outer shell; 11-Display cover; 12-Rear cover; 13-Camera protective cover; 2-Camera assembly; 3-Middle frame; 4-Display module. Detailed Implementation

[0154] The embodiments of this application will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of this application. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0155] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the ranges, the endpoint values ​​of the ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein. The terms "optional" and "optional" mean that they may or may not be included (or may or may not be present). The term "and / or" as used herein is inclusive; for example, "A and / or B" means only A, or only B, or both A and B.

[0156] Terminology and testing methods:

[0157] In this application, the phenomenon of "surface cracking" refers to the appearance of obvious cracks / fissures on the surface of chemically strengthened glass (e.g., chemically strengthened microcrystalline glass) under strong light. These microcracks / fissures are a few micrometers to tens of micrometers deep and do not penetrate the entire thickness of the glass.

[0158] In this application, glass-ceramics are a type of solid composite material that simultaneously contains a glassy phase and a crystalline phase (or microcrystalline phase, crystalline phase) prepared by targeted and controlled heat treatment of a substrate glass. Glass-ceramics are also known as glass ceramics or crystallized glass.

[0159] In this application, chemically strengthened glass-ceramics refers to solid composite materials obtained by chemically strengthening glass-ceramics. It should be understood that during chemical strengthening, alkali metal ions with large ionic radii (e.g., potassium or sodium ions) in the molten salt bath (or molten salt bath) will replace alkali metal ions with small ionic radii (e.g., sodium or lithium ions) in the glass-ceramics, thereby generating a volume difference in exchange ions and producing compressive stress (or compressive stress) on the surface of the glass-ceramics.

[0160] In this application, the substrate glass (or base glass) refers to glass that has not undergone nucleation, crystallization, or strengthening treatment.

[0161] In this application, nucleation treatment refers to growing crystal nuclei in the substrate glass through heat treatment; crystallization treatment refers to precipitating target crystals or crystal phases in the substrate glass through heat treatment.

[0162] In this application, the composition at the center of a chemically strengthened glass-ceramic refers to the composition at or near the center of the depth or thickness of the chemically strengthened glass-ceramic, that is, the composition of the region in the chemically strengthened glass-ceramic where ion exchange has not occurred. It should be understood that the composition at the center of the chemically strengthened glass-ceramic is the same as or substantially the same as the composition of the glass-ceramic used to prepare the chemically strengthened glass-ceramic, but which has not yet undergone chemical strengthening treatment.

[0163] In this application, the visible light wavelength range refers to 360nm to 740nm.

[0164] In this application, the main crystalline phase (or principal crystalline phase) refers to a crystalline phase that has a higher mass content (or weight percentage, mass percentage) than other crystalline phases present in glass-ceramics or chemically strengthened glass-ceramics.

[0165] In this application, the main surface refers to the surface with the largest surface area, such as the upper or lower surface of a horizontally placed microcrystalline glass sheet.

[0166] In this application, crystallinity refers to the percentage of the total mass of crystalline phases in glass-ceramics or chemically strengthened glass-ceramics to the total mass of glass-ceramics or chemically strengthened glass-ceramics, or the total content of crystalline phases in glass-ceramics or chemically strengthened glass-ceramics.

[0167] In this application, when light of a certain wavelength is irradiated onto the main surface of a glass-ceramic or a chemically strengthened glass-ceramic, the light will be reflected, absorbed, and transmitted. The ratio of the intensity of the transmitted portion to the intensity of the incident light is the transmittance.

[0168] In this application, refractive index refers to the ratio of the speed of light in a vacuum to the speed of light in the medium.

[0169] In this application, crystallized glass raw material refers to glass raw material that has undergone heat treatment for a period of time, so that the glass has reached a certain degree of crystallinity, but has not yet reached the target degree of crystallinity, and can continue to crystallize to reach the target degree of crystallinity when heated.

[0170] In this application, CT_LD refers to the tensile stress linear density, with units of MPa / mm. CT_LD is calculated using the following formula:

[0171]

[0172] Where T represents the thickness of the chemically strengthened glass-ceramic, in mm; DOL_0 represents the compressive stress layer depth of the chemically strengthened glass-ceramic, in μm; and |CT_AV| represents the absolute value of the average tensile stress of the chemically strengthened glass-ceramic, in MPa. It should be understood that the calculation formula for the tensile stress linear density involves substituting the data according to the above unit requirements to obtain the calculation result; the units themselves are not included in the calculation.

[0173] It should be understood that after glass-ceramics are placed in a molten salt bath for ion exchange, a compressive stress layer (or compressive stress layer) is formed on the surface of the glass-ceramics, while a tensile stress layer (or tensile stress layer) is formed inside the glass-ceramics. For example, during chemical strengthening, large-radius alkali metal ions in the molten salt bath exchange ions with small-radius alkali metal ions in the glass-ceramics, thereby forming a compressive stress layer on the surface of the glass-ceramics and a tensile stress layer inside the glass-ceramics. That is, after chemical strengthening, a chemically strengthened glass-ceramics containing both a compressive stress layer and a tensile stress layer is obtained.

[0174] In this application, CS_50 refers to the compressive stress value at a depth of 50 μm from the main surface of the chemically strengthened glass-ceramic, in MPa, obtained by testing with an SLP-2000 stress meter (or also known as a scattered light photoelastic stress meter).

[0175] In this application, |CT_AV| refers to the absolute value of the average tensile stress, in MPa. Specifically, it refers to the absolute value of the average value of all tensile stresses in the tensile stress layer, which is obtained by testing with an SLP-2000 stress meter.

[0176] In this application, DOL_0 refers to the compressive stress layer depth, or the compressive stress layer depth, specifically the distance from any main surface of the chemically strengthened glass-ceramic to the position near which the compressive stress is zero, obtained by testing with an SLP-2000 stress meter.

[0177] In this application, the aforementioned stress performance testing method is as follows: An SLP-2000 stress meter is used for testing. The light source wavelength is 518 nm, SOC = 25.5 (nm / cm) / MPa, the refractive index is set according to the refractive index value of the sample to be tested, and the exposure time is 300 µsec. When testing the stress performance of chemically strengthened glass-ceramics, a conductive liquid is first applied to the stress meter. Then, the chemically strengthened glass-ceramic sample to be tested is wiped clean and placed on the test path to measure its stress value. The stress meter is an SLP-2000, and the conductive liquid used is a conductive liquid with a refractive index of 1.51. The tensile stress linear density (CT_LD) value of the chemically strengthened glass-ceramics is then calculated using the aforementioned formula for calculating tensile stress linear density. The stress data of the chemically strengthened glass-ceramics measured by the SLP-2000 is used to calculate... The value, test location reference Figure 7 and Figure 8 .

[0178] In this application, the b-value is used to characterize the yellow-blue value of the material. The b-value in this application is the transmitted light b-value, and a positive b-value indicates that the material has a bluish tint.

[0179] In this application, the upper limit temperature for crystallization refers to the highest temperature at which crystals will form in the substrate glass. Above this temperature, crystals will not form in the substrate glass.

[0180] In this application, the thickness was obtained by micrometer measurement. It should be understood that, along the thickness direction of the glass-ceramic sample, the degree of ion exchange varies gradient from the surface to the center, while the overall increase (mass) in Na-K and / or Li-Na exchange generally does not exceed 1.5% of the total sample mass. Therefore, the expansion effect in the thickness direction is extremely slight, and the thickness can be approximated as essentially unchanged. That is, the thickness change of the glass-ceramic before and after chemical strengthening is very small and can be essentially ignored; the thickness of the glass-ceramic is essentially the same as the thickness of the chemically strengthened glass-ceramic it produces.

[0181] In this application, the dimensions of the microcrystalline glass sheet were tested using a two-dimensional measuring machine (instrument model: Miyu MY-YXCL-4030).

[0182] In this application, Young's modulus is used to characterize the ability of glass to resist elastic deformation under external forces. This application uses the UMS-100 ultrasonic material characterization system to test the Young's modulus of the glass-ceramic using acoustic waves.

[0183] In this application, the crystal phase, crystallinity, and average grain size of the glass-ceramic or chemically strengthened glass-ceramic are confirmed by XRD testing. Specifically:

[0184] (1) XRD test: The microcrystalline glass or chemically strengthened microcrystalline glass of this application was crushed and ground into samples with a particle size of less than 75 μm. The ground samples were tested using an X-ray diffractometer to obtain XRD diffraction peak curves and XRD diffraction data. The X-ray diffractometer used in this application was a Shimadzu XRD-6100, the target material was copper, 2θ=10°-50°, the scanning speed was 0.2° / min, the working voltage was 40kV, and the working current was 30mA.

[0185] (2) Determination of crystal phase: The crystal phase in the sample was determined by analyzing the XRD diffraction data using Jade software (JADE Standard 8.6).

[0186] (3) Determination of crystallinity (or total crystalline phase content): The crystallinity of the sample can be determined by importing the XRD test results (RAW format) into Jade software for fitting and calculation. Specifically, the ratio of the fitted crystalline phase peak area to the fitted total peak area is recorded as the crystallinity of the sample.

[0187] (4) Determination of average grain size (or average crystal size): Using the XRD test results, the average grain size of the sample can be calculated according to the Scherrer formula D = Kλ / (βcosθ). Where λ is the X-ray wavelength, λ = 0.154056 nm, β is the half-width at half-maximum (FWHM) of the diffraction peak, K = 0.89, and θ is the Bragg diffraction angle. Specifically, the RAW format file output by the XRD instrument is curve-fitted in Jade software. Jade outputs a fitting report. Based on the angle 2θ value and Peak FWHM value corresponding to each diffraction peak in the fitting report, the Peak FWHM value is converted to radians: β = (FWHM / 180 × 3.14). The grain size of each diffraction peak is calculated using the Scherrer formula D = Kλ / (βcosθ), and then averaged to obtain the average grain size in the sample.

[0188] In this application, referring to the national standard GB / T 7962.12-2010 "Test Methods for Colorless Optical Glass - Part 12: Intraspectral Transmittance", a haze meter was used to test the transmittance and b-value of the microcrystalline glass of this application. Specifically, the transmittance and b-value of five microcrystalline glass pieces from the same batch for different wavelengths of light were tested using a haze meter. The average b-value of the five microcrystalline glass pieces was recorded as the b-value result of the microcrystalline glass. The average transmittance of the five microcrystalline glass pieces under 550nm wavelength light was recorded as the transmittance result of the microcrystalline glass under 550nm wavelength light. The haze meter used in this application was a Konica Minolta CM-3600A spectrophotometer, with a transmission optical system, a planar refracting grating for beam splitting, a wavelength range of 360nm-740nm, a wavelength spacing of 10nm, and four pulsed xenon lamps as the illumination source. The ambient temperature where the instrument was placed was 24℃, and the air humidity was 40%.

[0189] In this application, the transmittance curves of microcrystalline glass or chemically strengthened microcrystalline glass under wavelengths in the visible light range were also tested using Shimadzu's UV-2600 UV-Vis spectrophotometer.

[0190] Density test: In this application, the density of the microcrystalline glass was tested using an electronic density balance SD-200L from ALFAMIRAGE, Japan.

[0191] Refractive index test: In this application, the refractive index of the microcrystalline glass was tested using the Abbe refractometer WYA-2WAJ of Shanghai Lichen Bangxi Instrument Technology Co., Ltd.

[0192] Thermal expansion softening point test: The sample was made into a cylinder with a diameter of 5.5 mm and a length of 20 mm. The sample was tested using a LINSEIS L75VD1000 thermal expansion meter, and the test output was a thermal expansion test curve. The temperature corresponding to the peak position of the curve is the thermal expansion softening point temperature of the sample.

[0193] Crystallization Upper Limit Temperature Test: Break the substrate glass into small pieces and place them in a long quartz tank until it is full. Set the temperature range of a gradient furnace (model JKZC-XJY01), such as 1050℃-1225℃, and take at least 6 temperature points from high to low within each temperature range. After the gradient furnace reaches the preset temperature range, place the long quartz tank containing the samples into the gradient furnace, so that the 6 temperature points correspond to 6 locations of the glass sample in the long quartz tank. Keep the long quartz tank at a constant temperature in the gradient furnace for 60-70 minutes, and then remove the long quartz tank. Observe the glass sample at different locations in the long quartz tank with a microscope or magnifying glass. If the glass sample becomes devitrified or fogged, it is determined that the glass sample at that location has crystallized. If the glass sample is completely transparent, it is determined that the glass sample at that location has not crystallized. The upper limit temperature range for crystallization is between the temperature point corresponding to the completely transparent sample and the temperature point corresponding to the adjacent devitrified or foggy sample. The average of the two temperature points is taken as the upper limit temperature for crystallization. If all the glass samples in the long quartz tank crystallize or do not crystallize at all within the temperature range set by the gradient furnace, the temperature range of the gradient furnace is reset, and the upper limit temperature for crystallization of the glass samples is determined.

[0194] In this application, M(K2O) is the mass percentage of K2O on the surface of the chemically strengthened glass-ceramic. M(Na2O) is the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic.

[0195] The testing method for M(K₂O): The K element content on the surface of the chemically strengthened glass-ceramic was measured using X-ray fluorescence spectrometry (XRF), and then the mass percentage of K₂O on the surface was calculated as follows: Surface K₂O mass percentage = (Surface K element content × Relative molecular mass of K₂O) / (Relative atomic mass of K element × 2). It should be understood that the surface K element content = K element mass / Total element mass, and the total element mass = Total oxide mass. The X-ray fluorescence spectrometer (XRF) used was a Thermo Scientific ARL PERFORM'X, the target material was Rh (rhodium), the tube voltage was 40 kV, the current was 60 mA, the collimator was 0.15, the crystal was LiF₂O₀, the detector was FPC, the test range was a circle with a diameter of 29 mm, and the testing method was the X_UQ method in the OXSAS analysis software.

[0196] The testing method for M(Na₂O): The Na content on the surface of the chemically strengthened glass-ceramic was measured using X-ray fluorescence spectrometry (XRF). The mass percentage of Na₂O on the surface was then calculated as follows: Surface Na₂O mass percentage = (Surface Na content × Relative molecular mass of Na₂O) / (Relative atomic mass of Na × 2). It should be understood that the surface Na content = Na mass / Total mass of elements, and the total mass of elements = Total mass of oxides. The X-ray fluorescence spectrometer (XRF) used was a Thermo Scientific ARL PERFORM'X, the target material was Rh (rhodium), the tube voltage was 30 kV, the current was 80 mA, the collimator was 0.40, the crystal was AxO₃, the detector was FPC, the test range was a circle with a diameter of 29 mm, and the testing method was the X_UQ method in the OXSAS analysis software.

[0197] In this application, the XRF instrument used a standard-free test, and the concentration of elements with atomic numbers 6 and below or their oxides in the chemically strengthened glass-ceramic was not tested. The mass percentage of K2O on the surface of the chemically strengthened glass-ceramic is calculated as K2O mass / total oxide mass, and the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic is calculated as Na2O mass / total oxide mass. The oxides include SiO2, Al2O3, ZrO2, Na2O, K2O, P2O5, and other oxides that can be accurately measured by XRF, but do not include B2O3, Li2O, and other oxides that cannot be accurately measured by XRF.

[0198] In this application, M'(K2O) is the mass percentage of K2O on the surface of the chemically strengthened glass-ceramic after each of the two main surfaces is thinned by 3 μm. M'(Na2O) is the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic after each of the two main surfaces is thinned by 3 μm. The testing methods for M'(K2O) and M'(Na2O) are the same as those for M(K2O) and M(Na2O).

[0199] Average sandpaper drop resistance test: In this application, the sandpaper drop resistance heights measured for each of the multiple chemically strengthened glass-ceramic samples from the same embodiment or comparative example are summed and divided by the number of samples tested. This sum is recorded as the average sandpaper drop resistance height of the tested chemically strengthened glass-ceramic, used to characterize its drop damage resistance. This drop damage resistance is obtained through a uniform sandpaper test, simulating the application scenario of the chemically strengthened glass-ceramic falling onto a surface with relatively uniform roughness.

[0200] Specifically, at least 10 samples were taken from each batch for testing, and the average sandpaper drop resistance was measured.

[0201] Where n is the number of glass samples tested in each batch, and hi is the drop height resistance of a single sample.

[0202] The test method for the drop height resistance of a single sample against sandpaper is as follows:

[0203] Step 1: Attach 80-grit sandpaper to the lower surface of the 181g model machine and place the model machine on the Green Map LT-SKDL-CD drop tester;

[0204] Step 2: Place the chemically strengthened glass-ceramic sample to be tested directly below the model machine, with the sample facing the sandpaper (specifically, the main surface of the glass-ceramic should face the sandpaper). Drop the model machine from a certain height, impacting the glass-ceramic sample directly below it. If the sample does not break, gradually increase the drop height of the model machine, continuing the impact until the sample breaks. For example, starting with a drop height of 0.4m, after one drop impact, if the sample does not break, increase the drop height by 0.1m and repeat the process until the sample breaks.

[0205] Step 3: Record the previous drop height of the chemically strengthened microcrystalline glass sample before it breaks as its sandpaper drop resistance height. For example, if the drop height is increased by 0.1m each time, and the drop height when the sample breaks is 0.5m, then the sandpaper drop resistance height of the sample is 0.4m.

[0206] t 强化 In this embodiment, the microcrystalline glass sample to be strengthened is placed in a corresponding salt bath environment for chemical strengthening. During the strengthening process, the microcrystalline glass sample is taken out at regular intervals, and its |CT_AV|, DOL_0, and T are tested using an SLP-2000. Then, the results are obtained using the formula...

[0207]

[0208] Calculate the CT_LD value at that moment. The enhancement time required for the CT_LD value to reach its maximum value is t. 强化 The test involved placing the microcrystalline glass in a corresponding salt bath environment to strengthen it. 强化 Stress data of the chemically strengthened glass obtained after a period of time.

[0209] Relation A: In this application, relation A A represents the stress characteristic value obtained after the microcrystalline glass sample has been strengthened in a corresponding salt bath environment for a period of time. It is the ratio of the stress integral of the compressive stress layer from the main surface of the chemically strengthened microcrystalline glass sample to the depth DOL_0 along the thickness direction to DOL_0. In the embodiment, the microcrystalline glass substrate sample to be strengthened is placed in a corresponding salt bath environment for chemical strengthening. 强化 After a period of time, the chemically strengthened glass-ceramic sample was taken out, and the corresponding stress curve and stress data such as DOL_0 were obtained by SLP-2000 testing. By integrating and calculating the stress curve, the A value of the chemically strengthened glass-ceramic sample in the corresponding salt bath environment can be obtained.

[0210] |K 0.5×DOL_0 |:Draw a tangent line at a depth t = 0.5 × DOL_0 from the main surface of the chemically strengthened glass-ceramic on the stress curve measured by SLP-2000, and calculate the slope of the tangent line, taking the absolute value.

[0211] Without any theoretical limitations, for glass-ceramics with high lithium content and lithium disilicate as the main crystalline phase, chemical strengthening treatment in a molten salt bath, especially at high temperatures, easily leads to a large number of irregular cracks / fissures appearing on the surface of the chemically strengthened glass-ceramics. These cracks / fissures exist on the surface of the chemically strengthened glass-ceramics. Please refer to [link to relevant documentation]. Figure 2 and Figure 4 The depth of these cracks ranges from 10μm to 100μm, and they are referred to as "surface cracks" below. The "surface cracks" problem in chemically strengthened glass-ceramics can lead to a significant reduction in their drop resistance and mechanical strength. More seriously, it can even cause the surface of chemically strengthened glass-ceramics to fail directly due to excessive cracks / fissures, rendering it unusable.

[0212] Unbound by theory, the inventors discovered that if the surface compressive stress generated during the chemical strengthening process of glass-ceramics is too concentrated while the internal tensile stress is more dispersed, it can easily lead to an excessive stress difference between the inside and outside of the matrix. The surface with excessively concentrated stress will exhibit a "bursting" phenomenon, resulting in "surface cracking," which ultimately causes the prepared chemically strengthened glass-ceramics to have the problem of "surface cracking."

[0213] Unrestricted by any theoretical limitations, the inventors discovered that when chemically strengthening microcrystalline glass with high lithium content and lithium disilicate as the main crystalline phase to prepare chemically strengthened microcrystalline glass with desired properties, the compatibility between the glass composition and the stress distribution structure is crucial. If the two are not compatible, the chemically strengthened microcrystalline glass is prone to "surface cracking," resulting in a significant reduction in its mechanical strength. However, when a microcrystalline glass with a specific composition is matched with a suitable and superior stress distribution structure, not only can the problem of "surface cracking" in the chemically strengthened microcrystalline glass be overcome, but the high mechanical strength of the chemically strengthened microcrystalline glass can also be ensured.

[0214] When chemically strengthening microcrystalline glass with high lithium content and lithium disilicate as the main crystalline phase, the compatibility between the glass composition and the chemical strengthening process is very important. If the compatibility between the two is poor, the above-mentioned well-matched stress distribution structure cannot be obtained, and chemically strengthened microcrystalline glass with the desired performance cannot be obtained.

[0215] To address the issue of surface cracking in glass-ceramics with high lithium content and lithium disilicate as the main crystalline phase after chemical strengthening, a chemically strengthened glass-ceramic with high lithium content, lithium disilicate as the main crystalline phase, and specific composition and stress distribution structure is provided. This chemically strengthened glass-ceramic not only avoids the surface cracking problem but also possesses high mechanical strength.

[0216] As described above, in some embodiments of this application, a chemically strengthened microcrystalline glass is provided, wherein the main crystalline phase of the chemically strengthened microcrystalline glass is lithium disilicate; the crystallinity of the chemically strengthened microcrystalline glass is not less than 65%; and the Li2O content at the center of the chemically strengthened microcrystalline glass is not less than 11% by mass percentage of oxides.

[0217] The chemically strengthened glass-ceramic has a compressive stress layer on its surface and a tensile stress layer inside; the chemically strengthened glass-ceramic satisfies the following relationship:

[0218]

[0219] B = A - 83989 × n(ZrO2) 2 +2526.5×n(ZrO2), 130≤B≤180, preferably, 135≤B≤180, more preferably 135≤B≤175;

[0220] Where t is the depth from the main surface of the chemically strengthened glass-ceramic, and CS(t) is the compressive stress value at depth t. The stress integral of the compressive stress layer from the main surface of the chemically strengthened glass-ceramic to DOL_0 is expressed in MPa·μm.

[0221] DOL_0 represents the depth of the compressive stress layer, in μm.

[0222] In relation A, the data is substituted according to the above unit requirements to perform calculations and obtain the results; the units are not involved in the calculation.

[0223] n(ZrO2) is the molar percentage content of ZrO2 at the center of the chemically strengthened microcrystalline glass;

[0224] In relation B, the values ​​from relation A and the molar percentage of ZrO2 are substituted into the equation to perform the calculation and obtain the result. Units are not involved in the calculation.

[0225] This application enables the chemically strengthened glass-ceramics with a specific composition and a lithium disilicate as the main crystalline phase to meet specific stress characteristics, particularly by ensuring that the molar percentage content of ZrO2 in the glass-ceramics and the stress characteristic relationship A meet specific requirements (i.e., meet the aforementioned relationship B range requirements). This not only effectively overcomes the problem of "surface cracking" in the chemically strengthened glass-ceramics, but also ensures that the chemically strengthened glass-ceramics have high mechanical strength properties, thereby ensuring that the chemically strengthened glass-ceramics have excellent damage resistance.

[0226] When the value of relation B exceeds the upper limit, the chemically strengthened glass-ceramic will exhibit "surface cracking"; while when the value of relation B is below the lower limit, the chemically strengthened glass-ceramic will not achieve the desired stress effect, its stress level will be low, and its mechanical and strength properties will be poor.

[0227] In some implementations, the value of relation B can be: 130.00, 135.00, 140.00, 145.00, 150.00, 155.00, 160.00, 165.00, 170.00, 175.00, 180.00, 144.41, 149.14, 151.82, 157.96, 159.24, 161.80, 166.00, 148.9 9, 165.83, 168.65, 170.67, 163.85, 155.53, 136.18, 155.43, 172.09, 147.01, 147.17, 165.17, 164.24, or 166.69, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as it yields the chemically strengthened glass-ceramic with the performance required by this application. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as it yields the chemically strengthened glass-ceramic with the performance required by this application.

[0228] In some embodiments of this application, the value of relation A satisfies: 120≤A≤250, preferably 130≤A≤240, and more preferably 130≤A≤235. By making the chemically strengthened glass crystal satisfy relation A, it is beneficial to obtain the desired high stress level of the chemically strengthened glass crystal, thereby ensuring that the chemically strengthened glass crystal has high mechanical strength properties.

[0229] In some implementations, the value of relation A can be: 120.00, 125.00, 130.00, 135.00, 140.00, 145.00, 150.00, 155.00, 160.00, 165.00, 170.00, 175.00, 180.00, 185.00, 190.00, 195.00, 200.00, 205.00, 210.00, 215.00, 220.00, 225.00, 230.00, 235.00, 240.00, 245.00, 250.00. The values ​​can be 0, 150.39, 155.13, 157.80, 163.95, 165.23, 167.78, 171.98, 130.02, 148.08, 153.52, 157.87, 150.70, 161.51, 200.59, 217.59, 234.24, 208.06, 207.14, 220.07, 224.21, or 226.66, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramic with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramic with the desired performance of this application is obtained.

[0230] In some embodiments of this application, the chemically strengthened glass-ceramic satisfies the following relationship: C = A - |CT_AV|, 30 ≤ C ≤ 90, preferably 30 ≤ C ≤ 85, more preferably 30 ≤ C ≤ 80, where |CT_AV| is the absolute value of the average tensile stress in MPa. By ensuring that the chemically strengthened glass-ceramic satisfies relationship C, it helps to overcome the problem of "surface cracking" in the prepared chemically strengthened glass-ceramic and helps to ensure that the chemically strengthened glass-ceramic has high mechanical strength properties. When the value of relationship C exceeds the upper limit, the prepared chemically strengthened glass-ceramic will experience "surface cracking"; while when the value of relationship C is lower than the lower limit, the prepared chemically strengthened glass-ceramic cannot obtain the ideal stress effect, its stress level is low, and its mechanical and strength properties are poor.

[0231] In some embodiments, the value of relation C can be: 30.00, 35.00, 40.00, 45.00, 50.00, 55.00, 60.00, 65.00, 70.00, 75.00, 80.00, 85.00, 90.00, 33.97, 40.28, 37.3, 41.41, 47.67, 42.93, 45.51, 45.77, 52.74, 53.28, 51.42, 52.28, 37.27, 64.74, 70.95, 77.45, 57.85, 52.49, 67.32, 66.26, or 64.31, or a value within the range of any two of the above specific values ​​as endpoints, as long as the chemically strengthened microcrystalline glass with the desired performance of this application can be obtained. It should be understood that, in specific implementations, any of the above ranges can be combined with any other ranges, as long as the chemically strengthened microcrystalline glass with the desired performance of this application can be obtained.

[0232] In some embodiments of this application, the chemically strengthened glass crystal satisfies the following relationship: 2≤|K 0.5×DOL_0 |≤6, preferably, 2.5≤|K 0.5×DOL_0 |≤5.5, more preferably, 3≤|K 0.5×DOL_0 |≤5, where |K 0.5×DOL_0 The absolute value of the slope of the stress curve when the depth t from the main surface of the chemically strengthened glass-ceramic is 0.5 × DOL_0. By ensuring that the chemically strengthened glass-ceramic satisfies the above relationship, it helps to overcome the problem of "surface cracking" in the prepared chemically strengthened glass-ceramic and helps to ensure that the chemically strengthened glass-ceramic has high mechanical strength properties. When |K 0.5×DOL_0 When the value of | exceeds the upper limit, the chemically strengthened glass-ceramic produced will exhibit a phenomenon of "surface cracking"; while when |K 0.5×DOL_0 When the value of | is lower than the lower limit, the chemically strengthened glass-ceramic produced cannot achieve the ideal stress effect, its stress level is low, and its mechanical and strength properties are poor.

[0233] In some implementations, the relation |K 0.5×DOL_0The value of | can be: 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 3.088, 3.154, 3.105, 3.241, 3.085, 3.208, 3.309, 2.958, 3.224, 3.647, 3.057, 3.464, 3.354, 4.587, 4.244, 4.216, 4.485, 4.454, or 4.324, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the chemically strengthened microcrystalline glass with the desired performance of this application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened microcrystalline glass with the desired performance of this application can be obtained.

[0234] In some embodiments of this application, the chemically strengthened glass-ceramic satisfies: 0 ≤ M(K2O) ≤ 1.5%, 5% ≤ M(Na2O) ≤ 25%; M(K2O) is the mass percentage of K2O on the surface of the chemically strengthened glass-ceramic, and M(Na2O) is the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic.

[0235] In some embodiments, M(K2O) can be 0, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, or 1.5%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramic with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramic with the desired performance of this application is obtained.

[0236] In some embodiments, M(Na2O) can be 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, 20.5%, 21%, 21.5%, 22%, 22.5%, 23%, 23.5%, 24%, 24.5%, or 25%, or it can be a value within a range of any two of the above specific values ​​as endpoints, as long as the chemically strengthened microcrystalline glass with the desired performance of this application can be obtained. It should be understood that, in specific implementations, any of the above ranges can be combined with any other ranges, as long as the chemically strengthened microcrystalline glass with the desired performance of this application can be obtained.

[0237] In some embodiments of this application, after reducing the thickness of each of the two main surfaces of the chemically strengthened glass-ceramic by 3 μm, the resulting thinned glass-ceramic satisfies the following: the mass percentage of K2O M'(K2O) on the surface of the glass-ceramic and the mass percentage of Na2O M'(Na2O) on the surface of the glass-ceramic are: 0 ≤ M'(K2O) ≤ 0.5%, 4.0% ≤ M'(Na2O) ≤ 20%.

[0238] In some embodiments, M'(K2O) can be 0, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramic with the desired performance of this application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the chemically strengthened glass-ceramic with the desired performance of this application can be obtained.

[0239] In some embodiments, M'(Na2O) can be 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, or 20%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramic with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the chemically strengthened glass-ceramic with the desired performance of this application is obtained.

[0240] It should be understood that the chemically strengthened glass-ceramic of this application is made by chemically strengthening glass-ceramic. The mass percentages of Na₂O and K₂O on the surface of the chemically strengthened glass-ceramic differ from those on the surface of the thinned chemically strengthened glass-ceramic obtained after thinning the two main surfaces of the chemically strengthened glass-ceramic by 3 μm along the thickness direction. This is because ion exchange (e.g., Li₂O₃) occurs during the chemical strengthening process of the glass-ceramic. + Or Na + They will be respectively affected by larger alkali metal ions (e.g., Na+). + or K + The microcrystalline glass surface is in direct contact with the salt bath, experiencing less resistance from the glass matrix and a higher surface exchange rate, thus forcing larger alkali metal ions (e.g., Na+) to pass through. + or K+ It is easier for ions to enter, but as ion exchange proceeds, the internal ions undergo ion exchange, and the resistance from the glass matrix increases, making it more difficult to proceed. Therefore, compared to the mass percentage of Na2O and K2O on the surface of the unthinned chemically strengthened microcrystalline glass after each of the two main surfaces is thinned by 3μm along the thickness direction, the mass percentage of Na2O and K2O on the surface of the unthinned chemically strengthened microcrystalline glass is higher.

[0241] In some embodiments of this application, the chemically strengthened glass-ceramic satisfies: 0.20 ≤ DOL_0 / T ≤ 0.25, preferably 0.21 ≤ DOL_0 / T ≤ 0.23, where DOL_0 is the compressive stress layer depth and T is the thickness of the chemically strengthened glass-ceramic. By ensuring a suitable proportional relationship between the compressive stress layer depth and the thickness of the chemically strengthened glass-ceramic, it is beneficial to ensure that the chemically strengthened glass-ceramic is in a better stress distribution state, thereby facilitating the improvement of mechanical strength properties by the stress structure.

[0242] In some embodiments, the DOL_O / T value in the chemically strengthened glass-ceramic can be 0.20–0.23 or 0.21–0.22. In some embodiments, the DOL_O / T value in the chemically strengthened glass-ceramic can be 0.20, 0.21, 0.22, 0.23, 0.24, or 0.25, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramic with the desired performance of this application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the chemically strengthened glass-ceramic with the desired performance of this application can be obtained.

[0243] In some embodiments of this application, the chemically strengthened glass-ceramic satisfies: 90μm≤DOL_0≤160μm, preferably 100.00μm≤DOL_0≤160.00μm, where DOL_0 is the compressive stress layer depth. By giving the chemically strengthened glass-ceramic a suitable DOL_0, it is possible to prevent sudden cracks from penetrating the compressive stress region and reaching the tensile stress region when impacted or pierced by blunt or sharp objects, thus preventing the chemically strengthened glass-ceramic from shattering. This is more conducive to improving the ability of the chemically strengthened glass-ceramic to counteract the energy driving crack propagation, thereby ensuring that the chemically strengthened glass-ceramic has excellent damage resistance, such as excellent resistance to drop damage.

[0244] In some embodiments, the DOL_0 of the chemically strengthened glass crystal can be 100.00 μm, 105.00 μm, 110.00 μm, 115.00 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 110.54 μm, 109.75 μm, 111.42 μm, 110.75 μm, 114.2 μm, 111.9 μm, 113.24 μm, 105.74 μm, 107.56 μm, etc. The micrometer values ​​can be 107.96 μm, 110.78 μm, 108.98 μm, 109.87 μm, 107.04 μm, 107.62 μm, 109.78 μm, 110.42 μm, 112.85 μm, 106.99 μm, 107.67 μm, or 110.42 μm, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramic with the desired performance of this application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramic with the desired performance of this application can be obtained.

[0245] The thickness T of the chemically strengthened glass-ceramic described in this application is not particularly limited. For example, in some embodiments of the present invention, the glass-ceramic used to prepare the chemically strengthened glass-ceramic is plate-shaped. Optionally, the thickness T of the glass-ceramic used to prepare the chemically strengthened glass-ceramic can be 0.35-1.0 mm, preferably 0.4-0.7 mm; more preferably, the thickness T is 0.45-0.55 mm. In some embodiments of this application, the thickness T of the chemically strengthened glass-ceramic described in this application can be 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1.0 mm, or can be a value within the range of any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramic with the desired performance of this application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the chemically strengthened glass-ceramic with the desired performance of this application can be obtained. Currently, electronic devices often pursue thinness and lightness, believing that the smaller the thickness, the lighter the weight, and the better the optical performance. This application can make the chemically strengthened glass-ceramic product as thin as possible while ensuring strength, thus meeting the requirements for thinner and lighter electronic devices.

[0246] This application enables chemically strengthened glass-ceramics to meet suitable stress characteristics, thereby facilitating the production of chemically strengthened glass-ceramics products with high stress levels. This, in turn, allows the stress characteristics to improve mechanical strength properties, ensuring that the chemically strengthened glass-ceramics have excellent damage resistance while preventing "surface cracking" on the surface.

[0247] In some embodiments of this application, the chemically strengthened glass crystal satisfies: 100MPa≤CS_50≤300MPa, preferably, 110MPa≤CS_50≤250MPa, more preferably, 110MPa≤CS_50≤240MPa, wherein CS_50 refers to the compressive stress value at a depth of 50μm from the main surface of the chemically strengthened glass crystal.

[0248] In some embodiments, the CS_50 of the chemically strengthened glass crystal can be 100.00 MPa, 110.00 MPa, 120.00 MPa, 130.00 MPa, 140.00 MPa, 150.00 MPa, 160.00 MPa, 170.00 MPa, 180.00 MPa, 190.00 MPa, 200.00 MPa, 210.00 MPa, 220.00 MPa, 230.00 MPa, 240.00 MPa, 250.00 MPa, 260.00 MPa, 270.00 MPa, 280.00 MPa, 290.00 MPa, 300.00 MPa, 158.56 MPa, or 168. The pressure values ​​can be 85 MPa, 168.41 MPa, 180.27 MPa, 195.42 MPa, 170.2 MPa, 188.74 MPa, 113.52 MPa, 153.44 MPa, 143.55 MPa, 147.58 MPa, 153.89 MPa, 184.21 MPa, 207.1 MPa, 216.95 MPa, 246.54 MPa, 223.64 MPa, 229.67 MPa, 223.5 MPa, 239.75 MPa, or 244.85 MPa, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramic with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramic with the desired performance of this application is obtained.

[0249] In some embodiments of this application, the chemically strengthened glass-ceramic satisfies: 80.00MPa≤|CT_AV|≤200.00MPa, preferably, 80.00MPa≤|CT_AV|≤170.00MPa, more preferably, 80.00MPa≤|CT_AV|≤160.00MPa, where |CT_AV| is the absolute value of the average tensile stress.

[0250] In some embodiments, the |CT_AV| of the chemically strengthened glass crystal can be 80.00MPa~160.00MPa, 100.00MPa~160.00MPa, 100.00MPa~125.00MPa, 105.00MPa~120.00MPa, 100.00MPa~150.00MPa, or 110.00MPa~115.00MPa. In some embodiments, the |CT_AV| of the chemically strengthened glass crystal can be 80 MPa, 85 MPa, 90 MPa, 100.00 MPa, 110.00 MPa, 120.00 MPa, 125.00 MPa, 130.00 MPa, 135.00 MPa, 140.00 MPa, 150.00 MPa, 160.00 MPa, 170.00 MPa, 180.00 MPa, 190.00 MPa, 200.00 MPa, 116.42 MPa, 114.85 MPa, 120.5 MPa, 122.54 MPa, 117. The pressure values ​​can be 56 MPa, 124.85 MPa, 126.47 MPa, 84.25 MPa, 95.34 MPa, 100.24 MPa, 106.45 MPa, 98.42 MPa, 124.24 MPa, 135.85 MPa, 146.64 MPa, 156.79 MPa, 150.21 MPa, 154.65 MPa, 152.75 MPa, 157.95 MPa, or 162.35 MPa, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramic with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramic with the desired performance of this application is obtained.

[0251] In some embodiments of this application, the chemically strengthened glass-ceramic satisfies: 40000.00 MPa / mm ≤ CT_LD ≤ 100000.00 MPa / mm, preferably 47000.00 MPa / mm ≤ CT_LD ≤ 95000.00 MPa / mm, where CT_LD refers to the tensile stress linear density. Controlling the CT_LD of the chemically strengthened glass-ceramic to a relatively large value, for example, not less than 40000 MPa / mm, helps ensure that the tensile stress stored inside the chemically strengthened glass-ceramic is sufficiently concentrated, thereby ensuring that it has a high surface stress level and can obtain excellent damage resistance, such as excellent drop damage resistance, to meet market demands.

[0252] In some embodiments, the CT_LD of the chemically strengthened glass crystal can be 55000MPa / mm to 92000MPa / mm, 58000MPa / mm to 90000MPa / mm, 56000MPa / mm to 94000MPa / mm, or 57000MPa / mm to 93000MPa / mm. In some embodiments, the CT_LD of the chemically strengthened glass crystal can be 40000MPa / mm, 45000MPa / mm, 50000MPa / mm, 55000MPa / mm, 60000MPa / mm, 65000MPa / mm, 66000MPa / mm, 67000MPa / mm, 68000MPa / mm, 69000MPa / mm, 70000MPa / mm, 7... 2000MPa / mm, 74000MPa / mm, 76000MPa / mm, 78000MPa / mm, 80000MPa / mm, 85000MPa / mm, 90000MPa / mm, 95000MPa / mm, 100000MPa / mm, 64943.73MPa / mm, 64430.85MPa / mm, 66795.56MPa / mm, 68254. 78MPa / mm, 63858.59MPa / mm, 68967.14MPa / mm, 69184.15MPa / mm, 48615.62MPa / mm, 54320.92MP a / mm, 56952.36MPa / mm, 59279.88MPa / mm, 55516.75MPa / mm, 69639MPa / mm, 77684.46MPa / mm, 835 The values ​​can be 14.41 MPa / mm, 87940.38 MPa / mm, 83865.25 MPa / mm, 84840.99 MPa / mm, 87379.11 MPa / mm, 89924.09 MPa / mm, or 90643.25 MPa / mm, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramic with the desired performance of this application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramic with the desired performance of this application can be obtained.

[0253] It should be understood that the chemically strengthened glass-ceramics of this application are made by chemically strengthening glass-ceramics, and the composition at the center of the chemically strengthened glass-ceramics is the same as or substantially the same as the composition of the original glass-ceramics. However, the composition at the surface of the glass-ceramics after chemical strengthening may differ from that before the chemical strengthening treatment. This is because ion exchange occurs during the chemical strengthening process. During ion exchange, a certain type of alkali metal ion (e.g., Li) at the surface of the newly formed glass-ceramics... + Or Na + They will be respectively affected by larger alkali metal ions (e.g., Na+). + or K + However, in embodiments, the glass composition and phase composition at or near the depth or thickness center of the glass-ceramic article will still have the composition and phase composition of the newly formed glass-ceramic. That is, in this application, the composition (e.g., the composition of the tensile stress layer) and phase composition at the center of the chemically strengthened glass-ceramic are the same as or substantially the same as those of the untreated glass-ceramic.

[0254] In this application, the microcrystalline glass used to prepare chemically strengthened microcrystalline glass can be obtained by heat treatment of a substrate glass. The composition of the substrate glass is the same as or substantially the same as that of the microcrystalline glass in terms of the molar percentage or mass percentage of oxides.

[0255] In some embodiments of this application, the composition of the substrate glass, the composition of the microcrystalline glass, or the composition at the center of the chemically strengthened microcrystalline glass, based on the molar percentage of oxides, includes: SiO2: 58%–66%, Al2O3: 0%–3.5%, P2O5: 1%–3%, ZrO2: 1%–6%, and Li2O: 24%–32%. By adjusting and controlling the content range of each oxide component, a specific glass composition can be achieved, which is beneficial for obtaining microcrystalline glass that satisfies a specific crystal phase structure, as well as for obtaining chemically strengthened microcrystalline glass that satisfies a specific stress structure.

[0256] In some embodiments of this application, the composition of the substrate glass, the composition of the glass-ceramic, or the composition at the center of the chemically strengthened glass-ceramic, based on the molar percentage of oxides, further comprises: SrO: 0%–3%, and / or, Na2O: 0%–4%, and / or, K2O: 0%–2%, and / or, CaO: 0%–5%, and / or, B2O3: 0%–1%, and / or, Ta2O5: 0%–1%, and / or, BaO: 0%–3%, and / or, MgO: 0%–3%, and / or, ZnO: 0%–3%, and / or, Y2O3: 0%–1%, and / or, La2O3: 0%–1%, and / or, Yb2O3: 0%–1%.

[0257] It is understandable that the measurement method of the composition of the substrate glass, the composition of the microcrystalline glass, or the composition at the center of the chemically strengthened microcrystalline glass can be transformed by conversion. For example, the measurement method of mole percentage of oxides can be transformed into mass percentage of oxides.

[0258] In some embodiments of this application, the composition of the substrate glass, the composition of the microcrystalline glass, or the composition at the center of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, includes: SiO2: 55%–75%, Al2O3: 0%–6%, P2O5: 2%–8%, ZrO2: 3%–12%, and Li2O: 11%–20%.

[0259] In some embodiments of this application, the composition of the substrate glass, the composition of the glass-ceramic, or the composition at the center of the chemically strengthened glass-ceramic, based on the mass percentage of oxides, further comprises: SrO: 0%–6%, and / or, Na2O: 0%–4%, and / or, K2O: 0%–2%, and / or, CaO: 0%–5%, and / or, B2O3: 0%–1%, and / or, Ta2O5: 0%–2%, and / or, BaO: 0%–6%, and / or, MgO: 0%–3%, and / or, ZnO: 0%–3%, and / or, Y2O3: 0%–2%, and / or, La2O3: 0%–2%, and / or, Yb2O3: 0%–4%.

[0260] In this application, SiO2 is the forming oxide of the glass network and an indispensable component constituting the glass network structure. Simultaneously, SiO2 is also an important component of the main crystalline phase, lithium disilicate (Li2Si2O5). Appropriately increasing the SiO2 content can enhance the stability and mechanical strength of the glass, facilitating the precipitation of the desired amount of lithium disilicate crystalline phase. However, excessive SiO2 increases the viscosity of the substrate glass, making glass melting more difficult and thus reducing the formability of the substrate glass. Therefore, to meet the glass formability requirements and achieve the desired crystallization effect, thereby obtaining the desired microcrystalline glass or chemically strengthened microcrystalline glass product, in this application, the molar percentage content of SiO2 in the composition of the substrate glass, the composition of the microcrystalline glass, or the composition at the center of the chemically strengthened microcrystalline glass is between 58% and 66%, or the mass percentage content of SiO2 is between 55% and 75%.

[0261] In some embodiments, the molar percentage of SiO2 in the composition of the substrate glass, the composition of the glass-ceramic, or the composition at the center of the chemically strengthened glass-ceramic, based on the molar percentage of oxides, can be 58%–66%, 60.5%–64.5%, 60%–65%, or 60.5%–64%. In some embodiments, the molar percentage of SiO2 in the composition of the substrate glass, the composition of the glass-ceramic, or the composition at the center of the chemically strengthened glass-ceramic, based on the molar percentage of oxides, can be 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 60.92%, 60.94%, 61.15%, 61.16%, 61.43%, 61.72%, 61.82%, 62.58%, 62.77%, 63.16%, 63.39%, or 63.86%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or chemically strengthened glass-ceramic with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or chemically strengthened glass-ceramic with the desired performance of this application is obtained.

[0262] In some embodiments, the mass percentage of SiO2 in the composition of the substrate glass, the microcrystalline glass, or the core composition of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, can be 55%–75%, 60%–71%, 62%–68%, or 63%–71%. In some embodiments, the mass percentage of SiO2 in the composition of the substrate glass, the microcrystalline glass, or the core composition of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, can be 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, or 65.8%. The percentages can be 6%, 70.54%, 69.11%, 68.06%, 70.78%, 67.86%, 66.67%, 65.63%, 66.06%, 63.50%, 63.96%, 64.45%, 65.47%, or 63.31%, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the desired performance of the glass-ceramic or chemically strengthened glass-ceramic is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the desired performance of the glass-ceramic or chemically strengthened glass-ceramic is obtained.

[0263] In this application, Al2O3 is used as an optional component. Adding an appropriate amount of Al2O3 can help promote ion exchange during the chemical strengthening process to some extent. However, excessive Al2O3 will increase the glass viscosity and easily lead to the precipitation of other crystalline phases, such as petalite, affecting the crystal structure of the glass-ceramic. Therefore, in order to achieve the desired crystal structure and enable the glass-ceramic or chemically strengthened glass-ceramic to obtain the desired properties, the molar percentage content of Al2O3 in the composition of the substrate glass, the composition of the glass-ceramic, or the composition at the center of the chemically strengthened glass-ceramic is 0% to 3.5%, or the mass percentage content of Al2O3 is 0% to 6%.

[0264] In some embodiments, the molar percentage of Al2O3 in the composition of the substrate glass, the microcrystalline glass, or the central composition of the chemically strengthened microcrystalline glass, expressed as a molar percentage of oxide, can be 0%, 0.2%, 0.4%, 0.5%, 0.6%, 0.8%, 1%, 1.2%, 1.4%, 1.5%, 1.6%, 1.8%, 2%, 2.5%, 3%, 3.5%, 1.14%, 1.22%, 1.23%, 1.37%, 1.38%, 1.4%, 1.42%, 1.43%, or 1.44%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0265] In some embodiments, the mass percentage of Al2O3 in the composition of the substrate glass, the microcrystalline glass, or the core composition of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, can be 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 2.7%, 2.64%, 2.63%, 2.33%, 2.58%, 2.53%, 2.52%, 2.51%, 2.42%, 2.43%, 2.45%, 2.08%, or 2.15%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0266] In this application, P2O5 is the glass-forming oxide, existing as phosphorus-oxygen tetrahedra [PO4] in the network structure. P2O5 preferentially appears during heat treatment, initially causing phase separation and agglomeration in the glass, forming the amorphous precursor phase Li3PO4. Then, Li3PO4 acts as a non-uniform nucleation site, allowing crystalline phases such as lithium silicate to grow attached to the amorphous Li3PO4. With increasing P2O5 content, the number of non-uniform nucleation sites increases, effectively refining the grains nucleated by Li3PO4, which is beneficial for improving the overall transmittance, uniformity, and reducing the b-value of the glass-ceramic. However, when the P2O5 content is too high, more Li3PO4 crystals are easily formed, resulting in insufficient Li2O content for lithium silicate formation. This leads to the precipitation of quartz crystals in the substrate glass, causing a decrease in the transmittance and overall optical uniformity of the glass-ceramic. Conversely, when the P2O5 content is too low, the precipitated crystals are too large, easily causing glass devitrification. Therefore, in order to achieve the desired crystallization effect of this application and enable the microcrystalline glass or chemically strengthened microcrystalline glass to obtain the desired properties, the molar percentage content of P2O5 in the composition of the substrate glass or the composition of the microcrystalline glass or the composition at the center of the chemically strengthened microcrystalline glass is 1% to 3%, or the mass percentage content of P2O5 is 2% to 8%.

[0267] In some embodiments, the molar percentage of P2O5 in the composition of the substrate glass, the composition of the microcrystalline glass, or the composition at the center of the chemically strengthened microcrystalline glass, based on the molar percentage of oxides, can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 1.51%, 1.74%, 1.83%, 1.84%, 1.85%, 1.86%, 1.87%, 1.89%, or 1.92%, or can be a value within a range of values ​​defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained.

[0268] In some embodiments, the mass percentage of P2O5 in the composition of the substrate glass, the microcrystalline glass, or the core of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, can be 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 4.66%, 5.01%, 4.89%, 4.46%, 3.98%, 4.79%, 4.72%, 4.67%, 4.68%, 4.49%, 4.65%, 4.49%, 4.52%, or 4.56%, or can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained.

[0269] In this application, ZrO2 is an intermediate oxide in glass formation. An appropriate amount of ZrO2 can improve the chemical stability of the glass, increase its hardness, and enhance its scratch and drop resistance. Simultaneously, due to the high cation charge and strong field of ZrO2, it has a significant accumulation effect on the glass structure and is commonly used as a nucleating agent in glass-ceramics. The higher the ZrO2 content, the greater the tolerance of the A value of the lithium disilicate glass-ceramic without "surface cracking" during chemical strengthening, and the more ideal the resulting stress effect. However, a high ZrO2 content results in poor optical properties of the glass-ceramic. Therefore, to meet the glass formability requirements and achieve the desired strength effect, the molar percentage content of ZrO2 in the composition of the substrate glass, the composition of the glass-ceramic, or the composition at the center of the chemically strengthened glass-ceramic is between 1% and 6%, or the mass percentage content of ZrO2 is between 3% and 12%.

[0270] In some embodiments, the molar percentage of ZrO2 in the composition of the substrate glass, the microcrystalline glass, or the central portion of the chemically strengthened microcrystalline glass, based on the molar percentage of oxides, can be 1%, 1.2%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, etc. The percentages are 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 1.44%, 1.89%, 2.18%, 2.34%, 2.36%, 3.23%, 4.47%, 4.57%, 4.59%, 4.61%, or 4.66%, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the desired performance of the glass-ceramic or chemically strengthened glass-ceramic is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as the desired performance of the glass-ceramic or chemically strengthened glass-ceramic is obtained.

[0271] In some embodiments, the mass percentage of ZrO2 in the composition of the substrate glass, the microcrystalline glass, or the core of the chemically strengthened microcrystalline glass, based on the mass percentage of oxide, can be 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 7.07%, 3.26%, 4.24%, 4.85%, 5.40%, 5.20%, 7.16%, 10.15%, 10.12%, 9.73%, 10.07%, 9.52%, 9.80%, or 9.88%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained.

[0272] In this application, Li₂O is an essential component, serving as the network oxide for glass formation. It not only improves the viscosity of the glass and promotes the melting and clarification of the molten glass, but is also one of the main components in the formation of lithium disilicate crystals. Furthermore, Li₂O provides alkali metal lithium ions for ion exchange with large-radius ions in the molten salt bath, making it a significant factor influencing the achievable stress level of chemically strengthened glass-ceramics. However, excessive Li₂O can lead to decreased stability in the glass crystallization process and even the precipitation of other undesirable crystalline phases, resulting in deterioration of the optical properties of the glass-ceramics. Therefore, to obtain glass-ceramics or chemically strengthened glass-ceramics that meet the desired crystalline structure, optical properties, and mechanical strength properties, the molar percentage content of Li₂O in the composition of the substrate glass, the composition of the glass-ceramics, or the composition at the center of the chemically strengthened glass-ceramics is 24%–32%, or the mass percentage content of Li₂O is 11%–20%.

[0273] In some embodiments, the molar percentage of Li2O in the composition of the substrate glass, the composition of the microcrystalline glass, or the composition at the center of the chemically strengthened microcrystalline glass, based on the molar percentage of oxides, can be 24%, 24.5%, 25%, 25.5%, 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, 30%, 30.5%, 31%, 31.5%, 32%, 27.54%, 29.25%, 29.38%, 29.52%, 29.8%, 30.22%, 30.4%, 30.44%, 30.81%, or 31.51%, or can be a value within a range of values ​​defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained.

[0274] In some embodiments, the mass percentage of Li₂O in the composition of the substrate glass, the microcrystalline glass, or the central portion of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, can be 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, etc. The values ​​can be 20%, 16.15%, 16.70%, 16.44%, 14.85%, 17.50%, 16.61%, 16.35%, 15.73%, 15.71%, 15.10%, 15.63%, 15.11%, or 15.21%, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the desired performance of the glass-ceramic or chemically strengthened glass-ceramic is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the desired performance of the glass-ceramic or chemically strengthened glass-ceramic is obtained.

[0275] In this application, Na₂O is an optional component, serving as an exooxide in the network. A suitable amount of Na₂O provides free oxygen, improves the viscosity of the glass, promotes the melting and clarification of the molten glass, and can also regulate the chemical strengthening rate. However, excessive Na₂O not only reduces the crystallinity of the glass-ceramic but also affects the chemical strengthening effect. Therefore, to ensure that the glass-ceramic or chemically strengthened glass-ceramic meets the desired structure and obtains the desired properties, the molar percentage content of Na₂O in the composition of the substrate glass, the composition of the glass-ceramic, or the composition at the center of the chemically strengthened glass-ceramic is 0% to 4%, or the mass percentage content of Na₂O is 0% to 4%.

[0276] In some embodiments, the molar percentage of Na₂O in the composition of the substrate glass, the microcrystalline glass, or the central component of the chemically strengthened microcrystalline glass, based on the molar percentage of oxides, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, or 1.9%. The percentages can be 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, or 4%, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the desired performance of the microcrystalline glass or chemically strengthened microcrystalline glass is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as the desired performance of the microcrystalline glass or chemically strengthened microcrystalline glass is obtained.

[0277] In some embodiments, the mass percentage of Na₂O in the composition of the substrate glass, the microcrystalline glass, or the central component of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, can be 0%, 0.1%, 0.2%, 0.3%, 0.34%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1 ... The percentages can be 0.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, or 4%, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the desired performance of the microcrystalline glass or chemically strengthened microcrystalline glass is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the desired performance of the microcrystalline glass or chemically strengthened microcrystalline glass is obtained.

[0278] In this application, K2O is an external oxide of the glass network and is one of the optional components. An appropriate amount of K2O can provide free oxygen, increasing the oxygen-silicon ratio in the glass structure; however, excessive K2O can affect the glass network structure, impacting its optical properties, thermal stability, chemical stability, mechanical strength, and weather resistance. Therefore, to ensure that the glass-ceramic or chemically strengthened glass-ceramic meets the desired structure and achieves the desired performance, the molar percentage content of K2O in the composition of the substrate glass, the composition of the glass-ceramic, or the composition at the center of the chemically strengthened glass-ceramic is 0% to 2%, or the mass percentage content of K2O is 0% to 2%.

[0279] In some embodiments, the molar percentage of K₂O in the composition of the substrate glass, the microcrystalline glass, or the core composition of the chemically strengthened microcrystalline glass, expressed as a molar percentage of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, or 2%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0280] In some embodiments, the mass percentage of K₂O in the composition of the substrate glass, the microcrystalline glass, or the core of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.46%, 0.5%, 0.6%, 0.7%, 0.78%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, or 2%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0281] In this application, CaO is used as an optional component of the network oxide in glass formation. An appropriate amount of CaO helps reduce the high-temperature viscosity of the glass and increase its density; however, excessive CaO will shorten the glass's thickness and increase its brittleness. Therefore, in order to obtain microcrystalline glass or chemically strengthened microcrystalline glass that meets the desired optical and mechanical strength properties, the molar percentage content of CaO in the composition of the substrate glass, the composition of the microcrystalline glass, or the composition at the center of the chemically strengthened microcrystalline glass is 0% to 5%, or the mass percentage content of CaO is 0% to 5%.

[0282] In some embodiments, the molar percentage of CaO in the composition of the substrate glass, the microcrystalline glass, or the core composition of the chemically strengthened microcrystalline glass, expressed as a molar percentage of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 0.92%, or 2.67%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0283] In some embodiments, the mass percentage of CaO in the composition of the substrate glass, the microcrystalline glass, or the core composition of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 0.92%, or 2.7%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0284] In this application, BaO, an alkaline earth metal oxide, is used as an optional component. An appropriate amount of BaO can adjust the glass phase composition in the glass-ceramic, helping to increase its density and Young's modulus. However, excessive BaO will degrade the optical properties of the glass-ceramic. Therefore, to obtain glass-ceramics or chemically strengthened glass-ceramics that meet the desired optical and mechanical strength properties, the molar percentage content of BaO in the composition of the substrate glass, the composition of the glass-ceramic, or the composition at the center of the chemically strengthened glass-ceramic is 0% to 3%, or the mass percentage content of BaO is 0% to 6%.

[0285] In some embodiments, the molar percentage of BaO in the composition of the substrate glass, the microcrystalline glass, or the central component of the chemically strengthened microcrystalline glass, expressed as a molar percentage of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, 0.91%, 1.38%, or 1.83%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0286] In some embodiments, the mass percentage of BaO in the composition of the substrate glass, the microcrystalline glass, or the central component of the chemically strengthened microcrystalline glass, based on the mass percentage of oxide, can be 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 3.76%, 4.85%, or 2.43%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0287] In this application, SrO, an alkaline earth metal oxide, is used as an optional component. An appropriate amount of SrO can adjust the glass phase composition in the glass-ceramic, helping to increase its density and Young's modulus. It also helps to lower the thermal expansion softening point of the glass-ceramic, thus facilitating its hot bending into 3D curved surfaces. However, excessive SrO will degrade the optical properties of the glass-ceramic. Therefore, to obtain glass-ceramics or chemically strengthened glass-ceramics that meet the desired optical and mechanical strength properties, the molar percentage content of SrO in the composition of the substrate glass, the composition of the glass-ceramic, or the composition at the center of the chemically strengthened glass-ceramic is 0% to 3%, or the mass percentage content of SrO is 0% to 6%.

[0288] In some embodiments, the molar percentage of SrO in the composition of the substrate glass, the microcrystalline glass, or the central component of the chemically strengthened microcrystalline glass, expressed as a molar percentage of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, 0.91%, 0.92%, 1.38%, 1.42%, or 1.83%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0289] In some embodiments, the mass percentage of SrO in the composition of the substrate glass, the microcrystalline glass, or the core of the chemically strengthened microcrystalline glass, based on the mass percentage of oxide, can be 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 2.68%, 2.57%, 1.64%, or 3.33%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0290] In this application, MgO is used as an optional component. An appropriate amount of MgO can play a role in adjusting the glass phase composition in the glass-ceramic. However, excessive MgO will affect crystal growth and the crystal phase structure of the glass-ceramic. Therefore, in order to obtain glass-ceramic or chemically strengthened glass-ceramic that meets the desired optical and mechanical strength properties, the molar percentage content of MgO in the composition of the substrate glass, the composition of the glass-ceramic, or the composition at the center of the chemically strengthened glass-ceramic is 0% to 3%, or the mass percentage content of MgO is 0% to 3%.

[0291] In some embodiments, the molar percentage of MgO in the composition of the substrate glass, the microcrystalline glass, or the core composition of the chemically strengthened microcrystalline glass, expressed as a molar percentage of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, or 1.83%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0292] In some embodiments, the mass percentage of MgO in the composition of the substrate glass, the microcrystalline glass, or the core of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, can be 0%, 0.1%, 0.15%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, or 1.32%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0293] In this application, ZnO is used as a network intermediate and is one of the optional components. An appropriate amount of ZnO can bind free oxygen, adjust the glass structure, and remain in the glass phase of the glass-ceramic, increasing the glass viscosity. However, excessive ZnO can affect crystal growth and the crystal phase structure of the glass-ceramic. Therefore, in order to obtain glass-ceramics or chemically strengthened glass-ceramics that meet the desired optical and mechanical strength properties, the molar percentage content of ZnO in the composition of the substrate glass, the composition of the glass-ceramic, or the composition at the center of the chemically strengthened glass-ceramic is 0% to 3%, or the mass percentage content of ZnO is 0% to 3%.

[0294] In some embodiments, the molar percentage of ZnO in the composition of the substrate glass, the microcrystalline glass, or the core composition of the chemically strengthened microcrystalline glass, expressed as a molar percentage of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, 0.54%, or 1.67%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0295] In some embodiments, the molar percentage of ZnO in the composition of the substrate glass, the microcrystalline glass, or the core composition of the chemically strengthened microcrystalline glass, expressed as a molar percentage of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.81%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, 0.54%, or 2.45%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0296] In this application, B2O3 is an optional component. Appropriate amounts of B2O3 can be used as a flux and / or softener, which helps improve the forming and hot bending effects of the glass. However, excessive B2O3 can lead to uncontrollable crystallization, resulting in deterioration of the optical properties of the glass-ceramic. Therefore, in order to obtain glass-ceramic or chemically strengthened glass-ceramic that meets the desired optical and mechanical strength properties, the molar percentage content of B2O3 in the composition of the substrate glass, the composition of the glass-ceramic, or the composition at the center of the chemically strengthened glass-ceramic is 0% to 1%, or the mass percentage content of B2O3 is 0% to 1%.

[0297] In some embodiments, the molar percentage of B2O3 in the composition of the substrate glass, the microcrystalline glass, or the central component of the chemically strengthened microcrystalline glass, based on the molar percentage of oxides, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or 0.46%, or can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0298] In some embodiments, the mass percentage of B2O3 in the composition of the substrate glass, the microcrystalline glass, or the core composition of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or 0.55%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0299] In this application, the appropriate selective addition of Y2O3, La2O3, Ta2O5 or Yb2O3 helps to increase the density of the glass-ceramic and its Young's modulus, but may also increase the refractive index of the glass-ceramic, thereby reducing its optical properties. Therefore, in order to obtain glass-ceramics or chemically strengthened glass-ceramics that meet the desired optical and mechanical strength properties, the molar percentage content of Y2O3 in the composition of the substrate glass or the composition of the glass-ceramics or the composition at the center of the chemically strengthened glass-ceramics is 0% to 1%, and / or, the molar percentage content of La2O3 is 0% to 1%, and / or, the molar percentage content of Ta2O5 is 0% to 1%, and / or, the molar percentage content of Yb2O3 is 0% to 1%, or the mass percentage content of Y2O3 is 0% to 2%, and / or, the mass percentage content of La2O3 is 0% to 2%, and / or, the mass percentage content of Ta2O5 is 0% to 2%, and / or, the mass percentage content of Yb2O3 is 0% to 4%.

[0300] In some embodiments, the molar percentage of Y₂O₃ in the composition of the substrate glass, the microcrystalline glass, or the central component of the chemically strengthened microcrystalline glass, based on the molar percentage of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1%, or can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0301] In some embodiments, the mass percentage of Y₂O₃ in the composition of the substrate glass, the microcrystalline glass, or the central component of the chemically strengthened microcrystalline glass, based on the mass percentage of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, or 0.83%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0302] In some embodiments, the molar percentage of La2O3 in the composition of the substrate glass, the microcrystalline glass, or the central component of the chemically strengthened microcrystalline glass, expressed as a molar percentage of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1%, or can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0303] In some embodiments, the mass percentage of La2O3 in the composition of the substrate glass, the microcrystalline glass, or the central component of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, or 1.18%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0304] In some embodiments, the molar percentage of Ta₂O₅ in the composition of the substrate glass, the microcrystalline glass, or the central component of the chemically strengthened microcrystalline glass, based on the molar percentage of oxides, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 0.46%, or 1%, or can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0305] In some embodiments, the mass percentage of Ta₂O₅ in the composition of the substrate glass, the microcrystalline glass, or the central component of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, or 1.44%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0306] In some embodiments, the molar percentage of Yb₂O₃ in the composition of the substrate glass, the microcrystalline glass, or the central component of the chemically strengthened microcrystalline glass, based on the molar percentage of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 0.46%, or 1%, or can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0307] In some embodiments, the mass percentage of Yb₂O₃ in the composition of the substrate glass, the microcrystalline glass, or the central component of the chemically strengthened microcrystalline glass, based on the mass percentage of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.5%, 3%, 3.5%, 4%, or 3.12%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application is obtained.

[0308] In some embodiments of this application, the chemically strengthened glass crystal satisfies: 2.00≤n(SiO2) / n(Li2O)≤2.40, preferably, 2.00≤n(SiO2) / n(Li2O)≤2.30, more preferably, 2.02≤n(SiO2) / n(Li2O)≤2.20, wherein n(SiO2) and n(Li2O) are the molar percentage contents of SiO2 and Li2O at the center of the chemically strengthened glass crystal, respectively.

[0309] It should be noted that the content relationships of each oxide in this application are expressed as percentages of oxide content in molar amounts, and the molar unit is not involved in the calculation. By adjusting the content of each oxide to meet specific content relationships, it is beneficial to obtain microcrystalline glass or chemically strengthened microcrystalline glass that meets the desired mechanical strength properties.

[0310] In some embodiments, the value of n(SiO2) / n(Li2O) can be 2, 2.1, 2.2, 2.3, 2.4, 2.01, 2.03, 2.07, 2.08, 2.09, 2.10, or 2.28, or it can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained.

[0311] In some embodiments of this application, the chemically strengthened glass crystal satisfies: 90% ≤ n(SiO2) + n(Li2O) ≤ 96%, preferably 90% ≤ n(SiO2) + n(Li2O) ≤ 95%, wherein n(SiO2) and n(Li2O) are the molar percentage contents of SiO2 and Li2O at the center of the chemically strengthened glass crystal, respectively.

[0312] In some embodiments, the value of n(SiO2)+n(Li2O) can be 90%, 91%, 92%, 93%, 94%, 95%, 96%, 90.17%, 90.19%, 90.31%, 90.4%, 90.41%, 90.81%, 91.24%, 91.62%, 92.16%, 93.38%, 93.39%, 94.26%, or 94.9%, or it can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained.

[0313] In some embodiments of this application, the chemically strengthened glass crystal satisfies the following: 20% ≤ 2.25 × n(Li₂O) - 8 × n(ZrO₂) - 0.2 × n(CaO) ≤ 60%, preferably 25% ≤ 2.25 × n(Li₂O) - 8 × n(ZrO₂) - 0.2 × n(CaO) ≤ 60%, wherein n(Li₂O), n(ZrO₂), and n(CaO) are the molar percentage contents of Li₂O, ZrO₂, and CaO at the center of the chemically strengthened glass crystal, respectively.

[0314] In some embodiments, the value of 2.25×n(Li₂O)-8×n(ZrO₂)-0.2×n(CaO) can be 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 29.39%, 29.77%, 30.05%, 42.65%, 43.99%, 50.6%, 52.02%, 52.88%, or 56.88%, or can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained.

[0315] In some embodiments of this application, the chemically strengthened glass crystal satisfies: 0% ≤

[0316] n(Y₂O₃) + n(La₂O₃) + n(Ta₂O₅) + n(Yb₂O₃) ≤ 1%, preferably 0% ≤

[0317] n(Y2O3)+n(La2O3)+n(Ta2O5)+n(Yb2O3)≤0.7%, where n(Y2O3), n(La2O3), n(Ta2O5), n(Yb2O3)

[0318] These represent the molar percentage content of Y2O3, La2O3, Ta2O5, and Yb2O3 at the center of the chemically strengthened microcrystalline glass.

[0319] In some embodiments, the value of n(Y₂O₃) + n(La₂O₃) + n(Ta₂O₅) + n(Yb₂O₃) can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or 0.46%, or it can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the desired performance of the glass-ceramic or chemically strengthened glass-ceramic is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the desired performance of the glass-ceramic or chemically strengthened glass-ceramic is obtained.

[0320] In some embodiments of this application, the chemically strengthened glass crystal satisfies: 0% ≤

[0321] n(SrO)+n(BaO)+n(CaO)+n(MgO)≤3%, preferably, 0%≤n(SrO)+n(BaO)+n(CaO)+n(MgO)≤2.7%, wherein n(SrO), n(BaO), n(CaO), and n(MgO) are the molar percentage contents of SrO, BaO, CaO, and MgO at the center of the chemically strengthened microcrystalline glass, respectively.

[0322] In some embodiments, the value of n(SrO)+n(BaO)+n(CaO)+n(MgO) can be 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 0.2%, 0.92%, 1.38%, 1.42%, 1.83%, or 2.67%, or it can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained.

[0323] In some embodiments of this application, the chemically strengthened glass crystal satisfies: 0 ≤

[0324] n(SrO) / [n(SrO)+n(BaO)+n(CaO)+n(MgO)]≤1, where n(SrO), n(BaO), n(CaO), and n(MgO) are the molar percentage contents of SrO, BaO, CaO, and MgO at the center of the chemically strengthened microcrystalline glass, respectively.

[0325] In some embodiments, the value of n(SrO) / [n(SrO)+n(BaO)+n(CaO)+n(MgO)] can be 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1, or it can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as it yields the microcrystalline glass or chemically strengthened microcrystalline glass with the performance required by this application. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as it yields the microcrystalline glass or chemically strengthened microcrystalline glass with the performance required by this application.

[0326] In this application, "the main crystalline phase is lithium disilicate" or other similar expressions refer to the fact that the mass percentage (mass % or wt%) of the lithium disilicate crystalline phase in the glass-ceramic used to prepare chemically strengthened glass-ceramics according to embodiments of this application is greater than 80% (mass % or wt%) of all crystalline phases. In some embodiments of this application, the mass percentage of the lithium disilicate crystalline phase in the glass-ceramic used to prepare chemically strengthened glass-ceramics is 80 wt% to 100 wt% of all crystalline phases, preferably, the mass percentage of the lithium disilicate crystalline phase in all crystalline phases of the glass-ceramic or chemically strengthened glass-ceramics is 85 wt% to 100 wt%. In some embodiments, the mass percentage of the lithium disilicate phase in all crystalline phases of the glass-ceramic used to prepare the chemically strengthened glass-ceramic can be 80 wt%, 80.5 wt%, 81 wt%, 81.5 wt%, 82 wt%, 82.5 wt%, 83 wt%, 83.5 wt%, 84 wt%, 84.5 wt%, 85 wt%, 85.5 wt%, 86 wt%, 86.5 wt%, 87 wt%, 87.5 wt%, 88 wt%, 88.5 wt%, 89 wt%, 89.5 wt%, 90 wt%, 95 wt%, or 100 wt%, or can be a value within a range of values ​​defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or chemically strengthened glass-ceramic with the desired performance of this application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained.

[0327] In this application, the crystallinity of the glass-ceramic used to prepare chemically strengthened glass-ceramics does not change significantly after chemical strengthening treatment. That is, the crystallinity of the glass-ceramic is similar to or basically the same as that of the chemically strengthened glass-ceramics.

[0328] In some embodiments of this application, the crystallinity of the glass-ceramic used to prepare the chemically strengthened glass-ceramic is not less than 65%, preferably not less than 70%, more preferably 70% to 90%, and more preferably 70% to 87%. Higher crystallinity of the glass-ceramic used to prepare the chemically strengthened glass-ceramic is more conducive to obtaining high mechanical strength and high damage resistance. However, excessively high crystallinity can easily affect the chemical strengthening effect of the glass-ceramic, leading to a prolonged chemical strengthening time for preparing chemically strengthened glass-ceramics with high stress levels, and also easily affecting the optical properties of the glass-ceramic. In this application, by ensuring that the glass-ceramic meets the desired crystallinity, it is beneficial to ensure that the chemically strengthened glass-ceramic obtained also meets the desired crystallinity, which is more conducive to obtaining chemically strengthened glass-ceramics with the desired high mechanical strength, high damage resistance, and excellent optical properties.

[0329] In some embodiments, the crystallinity of the glass-ceramic used to prepare the chemically strengthened glass-ceramic can be 65%, 70%, 72%, 74%, 76%, 78%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 79.85 ... The percentages can be 5%, 86.82%, 84.25%, 76.8%, 80.4%, 79.65%, 80.42%, 76.7%, 76.6%, 76.6%, 73.64%, 74.85%, 70.69%, 71.95%, or 70.4%, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the desired performance of the glass-ceramic or chemically strengthened glass-ceramic is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as the desired performance of the glass-ceramic or chemically strengthened glass-ceramic is obtained.

[0330] In some embodiments of this application, the average grain size of the glass-ceramic used to prepare the chemically strengthened glass-ceramic is no more than 100 nm, preferably no more than 50 nm, and more preferably 15–30 nm. A suitable average grain size is beneficial for the glass-ceramic to possess both excellent optical properties and high intrinsic strength, while if the average grain size is too high, the glass-ceramic is prone to devitrification. In this application, by ensuring that the glass-ceramic or chemically strengthened glass-ceramic meets an appropriate average grain size, it is beneficial to ensure that the glass-ceramic or chemically strengthened glass-ceramic achieves excellent mechanical strength properties and excellent optical properties.

[0331] In some embodiments, the average grain size of the glass-ceramic or chemically strengthened glass-ceramic used to prepare the glass-ceramic can be 100 nm, 50 nm, 40 nm, 35 nm, 30 nm, 25 nm, 20 nm, 15 nm, 10 nm, 23.7 nm, 26.8 nm, 23.2 nm, 19.6 nm, 19.5 nm, 24.5 nm, 24.2 nm, 22.8 nm, 23 nm, 24.6 nm, 24.8 nm, 26 nm, 25.5 nm, or 25.6 nm, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or chemically strengthened glass-ceramic with the performance required by this application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or chemically strengthened glass-ceramic with the performance required by this application can be obtained.

[0332] In some embodiments of this application, non-limiting examples of other possible crystalline phases in the glass-ceramic used to prepare chemically strengthened glass-ceramics include: a lithium feldspar crystalline phase, and / or a lithium phosphate crystalline phase. In some embodiments, the mass percentage of the lithium feldspar crystalline phase contained in the glass-ceramic or chemically strengthened glass-ceramics is less than or equal to 10%, preferably less than or equal to 5%, and more preferably, the glass-ceramic or chemically strengthened glass-ceramics does not contain the lithium feldspar crystalline phase. By controlling the precipitation of other crystalline phases (e.g., the lithium feldspar crystalline phase), it is more conducive to ensuring that the lithium disilicate crystalline phase forms the desired interlocking structure, thereby ensuring that the glass-ceramic or chemically strengthened glass-ceramics obtains high mechanical strength, excellent optical properties, and excellent damage resistance.

[0333] In some embodiments of this application, when the thickness does not exceed 0.7 mm, the b-value of the microcrystalline glass used to prepare the chemically strengthened microcrystalline glass is <1.0, preferably <0.80, and more preferably ≤0.60. It should be understood that in this application, after the microcrystalline glass undergoes chemical strengthening treatment to obtain chemically strengthened microcrystalline glass, its optical properties do not change significantly; that is, the b-value, transmittance, etc., of the microcrystalline glass are similar to or substantially the same as those of the chemically strengthened microcrystalline glass. In this application, the b-value refers to the optical b-value measured under a D65 light source. This application uses a Konica Minolta CM-3600A to test the b-value in transmittance mode, and the result shows b(D65). The smaller the b-value, the better the display effect of the microcrystalline glass can be ensured. When the b-value is too large, the microcrystalline glass will exhibit undesirable colors, causing its display effect to fail to meet the application requirements of the display screen cover glass.

[0334] In some embodiments, the b-value of the glass-ceramic or chemically strengthened glass-ceramic used to prepare the chemically strengthened glass-ceramic can be 1.0, 0.8, 0.9, 0.70, 0.65, 0.60, 0.55, 0.50, 0.45, 0.40, 0.35, 0.30, 0.25, 0.20, 0.39, 0.32, 0.49, 0.41, 0.56, 0.41, 0.47, 0.51, or 0.52, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or chemically strengthened glass-ceramic with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or chemically strengthened glass-ceramic with the desired performance of this application is obtained.

[0335] In some embodiments of this application, the glass-ceramic used to prepare the chemically strengthened glass-ceramic is transparent in the visible light wavelength range. Preferably, for 550nm wavelength light, the transmittance of the glass-ceramic or chemically strengthened glass-ceramic is ≥85%, more preferably ≥90%, and even more preferably ≥90.27%. Glass-ceramic or chemically strengthened glass-ceramic that meets these transmittance requirements ensures good light transmission and transparency, making it suitable for use in displays where high display quality is required. Here, "visible light wavelength range" refers to light with wavelengths from 360nm to 740nm.

[0336] In some embodiments, for 550nm wavelength light, the transmittance of the glass-ceramic used to prepare the chemically strengthened glass-ceramic can be 85%, 90%, 91%, 92%, 90.76%, 90.76%, 90.76%, 90.76%, 90.76%, 90.76%, 90.76%, 90.31%, 90.59%, 91%, 90.94%, 90.63%, 90.65%, 90.4%, 90.46%, 90.46%, 90.29%, 90.37%, 90.27%, 90.3%, or 90.35%, or a value within a range of values ​​defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or chemically strengthened glass-ceramic with the performance required by this application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the desired performance of this application can be obtained.

[0337] In some embodiments of this application, the Young's modulus of the glass-ceramic used to prepare the chemically strengthened glass-ceramic is greater than 100 GPa, preferably greater than 105 GPa, and more preferably between 110 GPa and 130 GPa. It should be understood that in this application, after the glass-ceramic undergoes chemical strengthening treatment to obtain the chemically strengthened glass-ceramic, its Young's modulus does not decrease. That is, when the Young's modulus of the glass-ceramic is greater than 100 GPa, the Young's modulus of the resulting chemically strengthened glass-ceramic should also be greater than 100 GPa. A higher Young's modulus is beneficial in ensuring that the chemically strengthened glass-ceramic possesses high mechanical strength and high resistance to damage.

[0338] In some embodiments, the Young's modulus of the glass-ceramic used to prepare the chemically strengthened glass-ceramic can be 100 GPa, 101 GPa, 102 GPa, 103 GPa, 104 GPa, 105 GPa, 106 GPa, 107 GPa, 108 GPa, 109 GPa, 110 GPa, 111 GPa, 112 GPa, 113 GPa, 114 GPa, 115 GPa, 116 GPa, 117 GPa, 118 GPa, 119 GPa, 120 GPa, 125 GPa, 128 GPa, or 130 GPa. The values ​​can be 118.6 GPa, 116.5 GPa, 116.1 GPa, 115.63 GPa, 116.52 GPa, 117.64 GPa, 118.8 GPa, 117.073 GPa, 114.27 GPa, 114.27 GPa, 113.3 GPa, 114.52 GPa, 120 GPa, 119.3 GPa, or 118.95 GPa, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the desired performance of the microcrystalline glass or chemically strengthened microcrystalline glass is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the desired performance of the microcrystalline glass or chemically strengthened microcrystalline glass is obtained.

[0339] In some embodiments of this application, the density of the glass-ceramic used to prepare the chemically strengthened glass-ceramic is 2.51 g / cm³. 3 ~2.65g / cm 3 In some embodiments, the density of the glass-ceramic used to prepare the chemically strengthened glass-ceramic can be 2.51 g / cm³. 3 2.52g / cm 3 2.53g / cm 3 2.54 g / cm 3 2.55g / cm 32.56 g / cm 3 2.57g / cm 3 2.58g / cm 3 2.59g / cm 3 2.60g / cm 3 2.61 g / cm 3 2.62 g / cm 3 2.63 g / cm 3 2.64 g / cm 3 Or 2.65g / cm 3 Alternatively, the value can be any value within a range defined by any two of the above specific values ​​as endpoints, as long as it yields the microcrystalline glass or chemically strengthened microcrystalline glass with the performance required by this application. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as it yields the microcrystalline glass or chemically strengthened microcrystalline glass with the performance required by this application.

[0340] In some embodiments of this application, the refractive index of the glass-ceramic used to prepare the chemically strengthened glass-ceramic is ≤1.60, preferably 1.54 to 1.60. In some embodiments, the refractive index of the glass-ceramic used to prepare the chemically strengthened glass-ceramic can be 1.54, 1.55, 1.56, 1.57, 1.58, 1.59, or 1.60, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or chemically strengthened glass-ceramic with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the glass-ceramic or chemically strengthened glass-ceramic with the desired performance of this application is obtained.

[0341] In some embodiments of this application, the glass-ceramic used to prepare the chemically strengthened glass-ceramic is 2D, 2.5D, 3D, or irregularly shaped. In some embodiments of this application, the glass-ceramic used to prepare the chemically strengthened glass-ceramic is of uniform or unequal thickness. Those skilled in the art can choose according to their needs. Here, "unequal thickness" means that the glass-ceramic or chemically strengthened glass-ceramic contains at least two portions with different thicknesses.

[0342] In some embodiments of this application, a sandpaper drop test is conducted on chemically strengthened glass-ceramics. 80-grit sandpaper is used. When the thickness does not exceed 0.70 mm, the average sandpaper drop resistance of the chemically strengthened glass-ceramics is ≥1.0 m, preferably ≥1.2 m, and more preferably ≥1.6 m. A higher average sandpaper drop resistance value indicates better drop damage resistance of the chemically strengthened glass-ceramics.

[0343] In some implementations, when chemically strengthened microcrystalline glass is dropped on 80-grit sandpaper, the average drop resistance can be 1.0m, 1.1m, 1.11m, 1.12m, 1.13m, 1.14m, 1.15m, 1.16m, 1.17m, 1.18m, 1.19m, 1.2m, 1.25m, 1.28m, 1.3m, 1.35m, 1.4m, and 1.4m. The values ​​can be 5m, 1.5m, 1.55m, 1.6m, 1.65m, 1.7m, 1.75m, 1.8m, 1.85m, 1.9m, 1.95m, 2.1m, 2.2m, 2.3m, 2.4m, 2.5m, or 2m, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramic with the desired performance of this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramic with the desired performance of this application is obtained.

[0344] Having introduced the composition, crystal structure, and stress structure of chemically strengthened glass-ceramics, the preparation methods of chemically strengthened glass-ceramics will now be described in detail.

[0345] In this application, the preparation process of chemically strengthened glass-ceramics mainly includes: the preparation process of glass-ceramics and the chemical strengthening process, while the preparation process of glass-ceramics mainly includes: the preparation process of substrate glass and the heat treatment process of substrate glass.

[0346] In this application, the substrate glass can be prepared using existing forming methods, and this application has no limitations on this. For example, the forming method of the substrate glass may include, but is not limited to, float glass, overflow glass, calendering, or casting processes. For instance, by uniformly mixing the components according to the formula, melting and forming the substrate glass, and then cooling and annealing it, the substrate glass can be obtained.

[0347] For example, raw materials (common industrial raw materials) are prepared according to the formula ratio, a clarifying agent is added, and then mixed for a period of time to obtain a uniformly mixed raw material mixture. The raw material mixture is placed in a platinum crucible, platinum-rhodium crucible, or furnace and heated to 1450°C–1700°C, preferably held at the melting temperature for 5 hours or more. Then, it is poured into a molding die and cooled to form, preferably to about 900°C. After that, it is placed in an annealing furnace for annealing treatment, preferably at an annealing temperature of 450°C–650°C and preferably for an annealing time of 10–48 hours. Then, it is cooled to room temperature in the furnace to obtain the substrate glass. Those skilled in the art can select the type and amount of clarifying agent according to their needs without any inventive effort. Furthermore, the clarifying agent may include, but is not limited to, one or more of sodium chloride, tin oxide, antimony oxide, or arsenic oxide, and the amount of clarifying agent added may be 0-1 wt% of the total amount of each raw material.

[0348] In some embodiments of this application, the heat treatment process of the substrate glass may include nucleation and / or crystallization, preferably both. In some embodiments, the crystallization process includes a one-step crystallization or a two-step crystallization. In some embodiments, to prepare curved microcrystalline glass, a two-step crystallization process may be selected. When a two-step crystallization process is used, the second crystallization step involves heating the crystallized glass material obtained from the first crystallization step to a hot-pressing temperature, while simultaneously performing 3D hot bending and the second crystallization step. Here, "crystallized glass material" refers to glass material that has a certain degree of crystallinity but has not yet reached the crystallinity requirement of the final sample.

[0349] In some embodiments of this application, in order to obtain the desired physicochemical properties of the glass-ceramic, the heat treatment of the substrate glass can be performed in one step, or in two or more steps. A one-step heat treatment means that nucleation (i.e., nucleation) is not performed separately; instead, the temperature is directly increased in one step, and nucleation and crystal growth occur at the temperature reached during this one-step heating process. This can be understood as a direct crystallization process. A two-step heat treatment means that two heating processes are performed, including but not limited to the following: a first step of nucleation treatment followed by a second step of crystallization treatment.

[0350] In some embodiments of this application, in order to precipitate the desired target crystalline phase in the glass-ceramic and obtain the desired physicochemical properties, the substrate glass is subjected to nucleation treatment and crystallization treatment sequentially. Further, during nucleation treatment, the nucleation temperature can be 500–700°C, and the nucleation time can be 10–1440 min; during crystallization treatment, the crystallization temperature can be 600–800°C, and the crystallization time can be 5–1440 min. During the heat treatment processes of nucleation and crystallization treatments, it is preferable to control the heating rate to be 5–20°C / min, more preferably 10°C / min, and the cooling rate can be 0.1°C / min–3°C / min.

[0351] In this application, after heat treatment, those skilled in the art can also perform other conventional steps to obtain a microcrystalline glass sample that meets the required specifications or requirements. For example, shaping, cutting (e.g., cutting with a multi-wire cutting machine), CNC machining (computer numerical control, i.e., numerical control machine tool), thinning, or polishing can be performed.

[0352] In some embodiments of this application, chemically strengthened glass crystals that meet the desired performance can be prepared by subjecting the aforementioned glass crystals to specific chemical strengthening treatments.

[0353] In some embodiments of this application, a step of polishing and thinning the prepared chemically strengthened microcrystalline glass is also included.

[0354] In this application, the chemical strengthening treatment, namely the ion exchange method, involves immersing the glass-ceramic in a molten salt bath, allowing the alkali metal ions with smaller ionic radii in the glass-ceramic to exchange with the alkali metal ions with larger ionic radii in the molten salt bath. This forms a compressive stress layer on the surface of the glass-ceramic and a tensile stress layer inside the glass-ceramic, resulting in a chemically strengthened glass-ceramic with superior mechanical properties.

[0355] In some embodiments of this application, the chemical enhancement treatment can be performed using a single-step or multi-step enhancement method. The molten salt bath used for the chemical enhancement treatment is a molten salt bath containing sodium and / or potassium salts. Preferably, the molten salt bath in this application is a mixed molten salt bath containing sodium and potassium salts, and the temperature of the molten salt bath is preferably 380℃~600℃, more preferably 430℃~550℃. In some embodiments of this application, the concentration of potassium salt in the salt bath is preferably 0wt%~95wt%, and the concentration of sodium salt is preferably 5wt%~100wt%, more preferably a certain amount (e.g., 0.01wt%-0.3wt%) of lithium salt is added to the salt bath. In some embodiments of this application, the chemical enhancement treatment time is preferably 0.1~24h. The sodium salt can be selected from at least one of sodium nitrate, sodium sulfate, and sodium carbonate, preferably sodium nitrate; the potassium salt can be selected from at least one of potassium nitrate, potassium sulfate, and potassium carbonate, preferably potassium nitrate; the lithium salt can be selected from at least one of lithium nitrate, lithium sulfate, and lithium carbonate, preferably lithium nitrate.

[0356] In this application, the stress distribution structure of the chemically strengthened glass-ceramic is closely related to the glass-ceramic composition (including oxide composition and crystal phase composition), salt bath composition, salt bath temperature, and chemical strengthening treatment time. Only when a glass-ceramic with a specific composition is chemically strengthened in a suitable salt bath (suitable composition and suitable temperature) for a suitable time can the prepared chemically strengthened glass-ceramic obtain a specific stress distribution structure, thereby achieving the excellent effect expected in this application.

[0357] The chemically strengthened microcrystalline glass with excellent performance provided in this application can be used in electronic devices, including but not limited to mobile phones, tablets, handheld game consoles, portable digital devices (such as digital cameras), vehicle central control systems, electronic whiteboard glass, smart home devices, and smart wearables (such as smart bracelets, smartwatches, and smart glasses). It can also be used in vehicles, aircraft, or spacecraft, and in any glass components requiring chemical strengthening. For example, it can be used for displays, cover glass, touchscreens, inner glass screens, or inner frames of electronic devices; for example, it can be used for windshields of vehicles, aircraft, or spacecraft, such as front windshields or side windshields. For example, it can be used for worktops, other surfaces, appliance doors, floor tiles, wall panels, or storage containers. Other surfaces can include, but are not limited to, exterior wall surfaces, stair tread surfaces, column cladding, or countertop surfaces; storage containers can include, but are not limited to, cups, plates, medicine bottles, or beverage bottles.

[0358] For example, the chemically strengthened glass-ceramic with excellent properties provided in this application can be used to manufacture glass devices. The glass devices referred to herein can be regular or irregular, and can be manufactured by those skilled in the art according to their needs.

[0359] For example, the chemically strengthened microcrystalline glass with excellent properties provided in this application can be used to manufacture cover glass, which can be a display screen cover, back cover, or camera protective cover for electronic devices. For example, the chemically strengthened microcrystalline glass with excellent properties provided in this application can be used in electronic devices. (Reference) Figure 15 , Figure 16 , Figure 17 and Figure 18 This application provides an electronic device, which can be a mobile phone, tablet computer, smart wearable device, or other electronic product. The electronic device includes a housing 1 assembled on the outside of the electronic device, and components such as a circuit board and battery located inside the housing 1. The housing 1 includes a display screen cover 11 assembled on the front side and a rear cover 12 assembled on the rear side. The display screen cover 11 covers a display module 4. The display screen cover 11 and / or the rear cover 12 are made of the aforementioned chemically strengthened microcrystalline glass. In this application, the display screen cover 11 and the rear cover 12 may be entirely made of the aforementioned chemically strengthened microcrystalline glass, or only partially made of the aforementioned chemically strengthened microcrystalline glass. In this application, the display screen may be a touch screen, and the display screen cover 11 may be a protective cover disposed on the touch screen. In this application, the rear cover 12 may only cover the rear side of the electronic device (and the side facing away from the display screen), or it may cover both the rear side and the side bezels of the electronic device. Optionally, the rear cover 12 may cover all the side bezels of the electronic device, or it may cover only a portion of the side bezels.

[0360] In some embodiments of this application, such as Figure 16 As shown, the electronic device also includes a camera assembly 2 located inside the housing 1. The housing 1 may include a camera protective cover 13, which covers the camera assembly 2 to protect it. The camera protective cover 13 is made of the aforementioned chemically strengthened microcrystalline glass. In this embodiment, the camera protective cover 13 may be partially or entirely made of the aforementioned chemically strengthened microcrystalline glass. In this embodiment, the location of the camera protective cover 13 depends on the location of the camera assembly 2; it may be located on the front side of the electronic device or on the rear side. In some embodiments of this application, the camera protective cover 13 may be a separate structure from the display cover 11 or the rear cover 12. In other embodiments of this application, the camera protective cover 13 may be an integral structure with the display cover 11 or the rear cover 12.

[0361] In some embodiments of this application, such as Figure 17 As shown, the electronic device also includes a mid-frame 3 located between the display module 4 and the housing 1, and the mid-frame 3 may include the aforementioned chemically strengthened microcrystalline glass.

[0362] In the embodiments of this application, the display screen cover, back cover, camera protective cover, and mid-frame of the electronic device may be made of the aforementioned chemically strengthened microcrystalline glass, or any two of them may be made of the aforementioned chemically strengthened microcrystalline glass, or all three of them may be made of the aforementioned chemically strengthened microcrystalline glass, or all four of them may be made of the aforementioned chemically strengthened microcrystalline glass.

[0363] In some embodiments of this application, the display screen cover, back cover, camera protective cover, or mid-frame in the electronic device can be 2D, 2.5D, 3D, or irregularly shaped. In some embodiments of this application, the display screen cover, back cover, camera protective cover, or mid-frame in the electronic device can be of uniform thickness or unequal thickness.

[0364] The technical solutions of this application will be further described in detail below with reference to the embodiments. The embodiments of this application described in detail below are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0365] Example 1

[0366] I. Preparation of Substrate Glass

[0367] Prepare the raw materials according to the proportions of each oxide in Table 1. The total mass of the prepared raw materials is 1000g. Add 5g of clarifying agent sodium chloride (NaCl) to the prepared raw materials. Then mix them with a V-type mixer at a speed of 25r / min for more than 30 minutes to obtain a uniformly mixed raw material mixture.

[0368] The mixed raw material mixture is transferred to a platinum crucible and then melted in a platinum-rhodium crucible at 1600℃ for more than 5 hours. After that, it is poured into a molding mold and cooled to about 900℃. Then it is placed in an annealing furnace at 460℃ for 12 hours and then cooled to room temperature with the furnace to obtain a base glass brick with a size of about 180mm*65mm*24mm.

[0369] II. Preparation of Microcrystalline Glass

[0370] Transparent microcrystalline glass samples can be prepared by sequentially performing nucleation and crystallization treatments on the substrate glass brick. The composition of the prepared microcrystalline glass is the same as that of the substrate glass, based on the molar percentage of oxides, as detailed in Table 1. The relationships between the compositions of the microcrystalline glass are shown in Table 2.

[0371] To obtain the microcrystalline glass product of Example 1 of this application, during nucleation treatment, the temperature is increased to the nucleation temperature (520°C) at a heating rate of 10°C / min, and the holding time is 240 min. During crystallization treatment, the temperature is increased from the nucleation temperature to the crystallization temperature (690°C) at a heating rate of 10°C / min, and the holding time is 90 min. Then, the temperature is decreased to room temperature at a cooling rate of 1°C / min to obtain the microcrystalline glass sample brick. The nucleation holding time, or nucleation time, refers to the time during which the crystallization furnace is heated to the set nucleation temperature at the set heating rate and held at that temperature. The crystallization holding time, or crystallization time, refers to the time during which the crystallization furnace is heated to the set crystallization temperature at the set heating rate and held at that temperature.

[0372] After the obtained microcrystalline glass sample bricks are successively cut, CNC machined (the CNC instrument used in this application is model: RCG500S), and polished, a microcrystalline glass sample that meets the required specifications and requirements can be obtained.

[0373] In the specific embodiments and comparative examples of this application, the microcrystalline glass sample brick was subjected to the aforementioned cold working process to produce a microcrystalline glass polished sheet sample with a length and width of 50mm×50mm and a thickness of 0.50mm.

[0374] The following tests were conducted on the microcrystalline glass sample obtained in Example 1:

[0375] The crystal phase composition, crystallinity, average crystal size (average grain size), expansion softening point, density, refractive index, Young's modulus, optical b-value, and transmittance (under 550 nm wavelength light) of the microcrystalline glass samples were tested respectively, and the results are shown in Table 3.

[0376] III. Preparation of Chemically Strengthened Microcrystalline Glass

[0377] The microcrystalline glass polished sheet obtained above was subjected to a one-step chemical strengthening treatment in a mixed salt at 460°C for 600 min. The composition of the mixed salt was: the mass ratio of NaNO3:KNO3:LiNO3 in the molten salt was 29.99%:69.98%:0.03%.

[0378] After chemical strengthening treatment, the glass-ceramic sample was removed and slowly cooled to room temperature in a strengthening furnace. The salt coating on the surface of the glass-ceramic was then washed away with water. After drying, the chemically strengthened glass-ceramic was obtained. The following tests were conducted on the chemically strengthened glass-ceramic obtained in Example 1:

[0379] I. Determining whether chemically strengthened glass-ceramics have "surface cracks": If strong light is shone on the surface of the chemically strengthened glass-ceramics and no cracks are observed on the glass surface, then... Figure 1As shown, or when chemically strengthened glass-ceramics are placed under an Axiolab 5 polarizing microscope with an LED light source and magnified 100x or 200x, no cracks are observed on the glass surface. Figure 3 If the appearance is satisfactory, it indicates that the chemically strengthened microcrystalline glass does not have a "surface cracking" problem and is recorded as "qualified" in appearance. However, if a bright crack is observed on the surface of the chemically strengthened microcrystalline glass when illuminated with strong light, such as... Figure 2 As shown, or by placing the chemically strengthened glass-ceramic under an Axiolab 5 polarizing microscope with an LED light source and magnification of 100x or 200x, cracks can be observed on the glass surface, such as... Figure 4 This indicates that the chemically strengthened microcrystalline glass has a "surface cracking" problem, and is recorded as "unqualified" in appearance.

[0380] The effect of the chemically strengthened microcrystalline glass in Example 1 under strong light irradiation is as follows: Figure 1 As shown, the morphology of the main surface and the cross-section along the thickness direction of the chemically strengthened glass-ceramic under a microscope (200x magnification) is as follows. Figure 3 and Figure 5 As shown, there are no bright cracks, and there are no irregular cracks inside or on the surface of the glass.

[0381] II. Stress Testing: The chemically strengthened microcrystalline glass obtained in each embodiment or comparative example was tested under an SLP-2000 stress meter (the light source wavelength was 518 nm, SOC = 25.5 (nm / cm) / MPa, the refractive index was set according to the refractive index value of the sample to be tested, and the exposure time was 300 μsec) to measure CS_50, DOL_0, and |CT_AV|; then the tensile stress linear density CT_LD value, the stress integral value of the compressive stress layer from the main surface of the chemically strengthened microcrystalline glass to DOL_0, and the absolute value of the slope of the stress curve when the depth t is 0.5 × DOL_0, |K 0.5×DOL_0 The results are shown in Table 4.

[0382] III. Surface Composition Test of Chemically Strengthened Glass-Ceramics: The mass percentages of K2O and Na2O on the surface of the prepared chemically strengthened glass-ceramics were measured using XRF, and the results are shown in Table 5. Simultaneously, the two main surfaces of the prepared chemically strengthened glass-ceramics were polished and thinned by 3 μm on each surface to obtain the thinned chemically strengthened glass-ceramics. The mass percentages of K2O and Na2O on the surface of the thinned chemically strengthened glass-ceramics were measured using XRF, and the results are shown in Table 5.

[0383] The transmittance curve of the chemically strengthened microcrystalline glass in Example 1 is shown in the figure below. Figure 9 As shown. By Figure 9As can be seen, in this application, the chemically strengthened microcrystalline glass is transparent and has high transmittance in the visible light range.

[0384] The XRD pattern of the glass-ceramic in Example 1 is as follows: Figure 10 As shown, the XRD patterns of the glass-ceramic in Example 1 before and after chemical strengthening are as follows: Figure 11 As shown. By Figure 10 and Figure 11 It is known that in this application, the main crystalline phase in both the microcrystalline glass and the chemically strengthened microcrystalline glass is the lithium disilicate crystalline phase, and the crystalline phase structure of the microcrystalline glass does not change significantly before and after the chemical strengthening treatment.

[0385] Example 2-Example 21

[0386] Each of these experiments was conducted with reference to Example 1, except that the glass composition, different process parameters, and corresponding test results of each example are shown in Tables 1-5.

[0387] Comparative Examples 1-10

[0388] The experiments were conducted in accordance with Example 1, with the differences being that the glass composition, different process parameters, and corresponding test results of each comparative example are shown in Tables 1-5.

[0389] Among them, the XRD patterns of the microcrystalline glass in Comparative Example 5 before and after chemical strengthening are as follows: Figure 12 As shown. By Figure 12 It is known that in this application, the main crystalline phase in both the microcrystalline glass and the chemically strengthened microcrystalline glass is the lithium disilicate crystalline phase, and the crystalline phase structure of the microcrystalline glass does not change significantly before and after the chemical strengthening treatment.

[0390] Crystallization upper limit temperature test: In order to analyze the industrial mass production feasibility of the microcrystalline glass of this application, the crystallization upper limit temperature of the substrate glass of some embodiments was tested, as detailed in Table 3. The crystallization upper limit temperature of the substrate glass of each embodiment tested was between 1000℃ and 1100℃, indicating that the microcrystalline glass of this application is conducive to industrial mass production.

[0391] Expansion softening point test: In order to analyze the 3D hot bending effect of the microcrystalline glass of this application, the thermal expansion coefficient test curves of the microcrystalline glass in some embodiments were tested, and the expansion softening point was obtained. As shown in Table 3, the test results show that the expansion softening point of the microcrystalline glass of this application is between 750℃ and 830℃, indicating that the microcrystalline glass of this application is conducive to 3D hot bending to prepare 3D curved surface microcrystalline glass.

[0392]

[0393]

[0394]

[0395]

[0396]

[0397]

[0398]

[0399]

[0400]

[0401]

[0402]

[0403]

[0404] From the embodiments and comparative examples described in Tables 1-5 above, it can be seen that, compared to the comparative examples, the embodiments of this application, by using a high-lithium-content microcrystalline glass with a specific composition and lithium disilicate as the main crystalline phase, after chemical strengthening treatment, satisfy specific stress characteristics. These include ensuring that the molar percentage content of ZrO2 in the microcrystalline glass and the stress characteristic equation A meet specific requirements (i.e., meet the range requirements of equation B), or that the stress characteristic equation A and the average tensile stress value |CT_AV| meet specific requirements (i.e., meet the range requirements of equation C), or that the slope of the stress curve |K 0.5×DOL_0 Meeting specific range requirements can not only effectively overcome the problem of "surface cracking" in the prepared chemically strengthened glass-ceramics, but also ensure that the chemically strengthened glass-ceramics have high mechanical strength properties, thereby ensuring that the chemically strengthened glass-ceramics have excellent damage resistance properties.

[0405] In the schemes of Comparative Examples 1-10, the composition and stress structure of the chemically strengthened microcrystalline glass do not meet the specific requirements of this application. For example, they do not meet the specific range requirements of relation B and relation C required by the scheme of this application. As a result, the chemically strengthened microcrystalline glass prepared in each comparative example either has the problem of "surface cracking" and cannot meet the appearance requirements, nor can it achieve excellent drop damage resistance, or the stress level obtained is too low and cannot obtain the ideal stress effect. The mechanical properties and strength properties are poor and it is also impossible to achieve excellent drop damage resistance.

[0406] For example, the chemically strengthened glass-ceramics prepared in Comparative Examples 1 to 9, after calculation using equations B and C, were found to exceed the requirements of the technical solution of this application. Final testing revealed that these chemically strengthened glass-ceramics all exhibited "surface cracking" problems, and their average sandpaper drop resistance height was less than 0.8m during sandpaper drop tests. The chemically strengthened glass-ceramics prepared in Comparative Example 10, after calculation using equations B and C, were found to be below the requirements of the technical solution of this application. Final testing revealed that although this chemically strengthened glass-ceramics did not exhibit "surface cracking" problems, its average sandpaper drop resistance height was only 0.9m, less than 1m.

[0407] For example, in Examples 1-7, Comparative Examples 5-7, and Comparative Example 10, microcrystalline glasses with the same glass composition and crystal phase structure were used to prepare chemically strengthened microcrystalline glasses. However, due to the different stress characteristics and the different values ​​of relational formulas B and C satisfied by the composition of the prepared chemically strengthened microcrystalline glasses, it was ultimately found that the chemically strengthened microcrystalline glasses prepared in Examples 1-7, which meet the requirements of the technical solution scope of this application, not only overcame the problem of "surface cracking," but also showed higher average sandpaper drop resistance during sandpaper drop tests. The chemically strengthened glass-ceramics prepared in Comparative Examples 5 to 7, which did not meet the requirements of this application's technical scope, all exhibited "surface cracking" problems when subjected to drop tests with sandpaper, with an average drop height of less than 0.6m. While the chemically strengthened glass-ceramic prepared in Comparative Example 10, which also did not meet the requirements of this application's technical scope, did not exhibit "surface cracking," its average drop height was less than 1m during sandpaper drop tests. This indicates that when chemically strengthening glass-ceramics with high lithium content and lithium disilicate as the main crystalline phase to prepare chemically strengthened glass-ceramics with desired properties, the compatibility between the glass composition and the stress distribution structure is crucial. When a glass-ceramic with a specific composition is matched with a suitable and optimal stress distribution structure, not only can the "surface cracking" problem of the prepared chemically strengthened glass-ceramics be overcome, but the high mechanical strength properties of the chemically strengthened glass-ceramics can also be ensured.

[0408] The above are merely specific embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A chemically strengthened microcrystalline glass, characterized in that, The main crystalline phase of the chemically strengthened glass-ceramic is lithium disilicate; the crystallinity of the chemically strengthened glass-ceramic is not less than 65%. The surface of the chemically strengthened microcrystalline glass has a compressive stress layer, and the interior has a tensile stress layer; The composition of the chemically strengthened glass-ceramic at its center or in the tensile stress layer, based on the molar percentage of oxides, comprises: SiO2: 60%~66%, Al2O3: 0%~2.5%, P2O5: 1%~3%, ZrO2: 1%~6%, Li2O: 27%~32%, SrO: 0%~3%, Na2O: 0%~4%, K2O: 0%~2%, Ca O: 0%~5%, B2O3: 0%~1%, Ta2O5: 0%~1%, BaO: 0%~3%, MgO: 0%~3%, ZnO: 0%~3%, Y2O3: 0%~1%, La2O3: 0%~1%, Yb2O3: 0%~1%; The chemically strengthened glass-ceramic satisfies the following relationship: ; B=A-83989×n(ZrO2) 2 +2526.5×n(ZrO2),130≤B≤180; Where t is the depth from the main surface of the chemically strengthened glass-ceramic, and CS(t) is the compressive stress value at depth t. The stress integral of the compressive stress layer from the main surface of the chemically strengthened glass-ceramic to DOL_0 is expressed in MPa·μm. DOL_0 represents the depth of the compressive stress layer, in μm. In relation A, the data is substituted according to the above unit requirements to perform calculations and obtain the results; the units are not involved in the calculation. n(ZrO2) is the molar percentage content of ZrO2 at the center of the chemically strengthened microcrystalline glass; In relation B, the values ​​from relation A and the molar percentage of ZrO2 are substituted into the equation to perform the calculation and obtain the result. Units are not involved in the calculation.

2. The chemically strengthened microcrystalline glass according to claim 1, characterized in that, 135≤B≤180。 3. The chemically strengthened microcrystalline glass according to claim 2, characterized in that, 135≤B≤175。 4. The chemically strengthened microcrystalline glass according to any one of claims 1 to 3, characterized in that, The value of relation A satisfies: 120≤A≤250.

5. The chemically strengthened microcrystalline glass according to claim 4, characterized in that, 130≤A≤240。 6. The chemically strengthened microcrystalline glass according to claim 5, characterized in that, 130≤A≤235。 7. The chemically strengthened microcrystalline glass according to claim 5, characterized in that, 190≤A≤240。 8. The chemically strengthened glass-ceramic according to any one of claims 1 to 3, characterized in that, The chemically strengthened glass-ceramic satisfies the following relationship: C=A-|CT_AV|, 30≤C≤90, where |CT_AV| is the absolute value of the average tensile stress in MPa.

9. The chemically strengthened microcrystalline glass according to claim 8, characterized in that, 30≤C≤85。 10. The chemically strengthened microcrystalline glass according to claim 9, characterized in that, 30≤C≤80。 11. The chemically strengthened glass-ceramic according to claim 10, characterized in that, 50≤C≤80。 12. The chemically strengthened microcrystalline glass according to claim 4, characterized in that, The chemically strengthened glass-ceramic satisfies the following relationship: C=A-|CT_AV|, 30≤C≤90, where |CT_AV| is the absolute value of the average tensile stress in MPa.

13. The chemically strengthened glass-ceramic according to any one of claims 1 to 3, characterized in that, The chemically strengthened glass-ceramic satisfies the following relationship: 2.0 ≤ |K 0.5×DOL_0 |≤6.0, where |K 0.5×DOL_0 |The absolute value of the slope of the stress curve at a depth t = 0.5 × DOL_0 from the main surface of the chemically strengthened glass-ceramic.

14. The chemically strengthened microcrystalline glass according to claim 13, characterized in that, 3.5≤|K 0.5×DOL_0 |≤5.0。 15. The chemically strengthened glass-ceramic according to claim 12, characterized in that, The chemically strengthened glass-ceramic satisfies the following relationship: 2.0 ≤ |K 0.5×DOL_0 |≤6.0, where |K 0.5×DOL_0 |The absolute value of the slope of the stress curve at a depth t = 0.5 × DOL_0 from the main surface of the chemically strengthened glass-ceramic.

16. The chemically strengthened glass-ceramic according to any one of claims 1 to 3, characterized in that, The chemically strengthened microcrystalline glass satisfies: 0.20≤DOL_0 / T≤0.25, where DOL_0 is the compressive stress layer depth and T is the thickness of the chemically strengthened glass-ceramic; and / or, 90.00μm≤DOL_0≤160.00μm, where DOL_0 is the compressive stress layer depth; and / or, 100.00MPa≤CS_50≤300.00MPa, where CS_50 refers to the compressive stress value at a depth of 50μm from the main surface of the chemically strengthened glass-ceramic; and / or, 80.00MPa≤|CT_AV|≤200.00MPa, where |CT_AV| is the absolute value of the average tensile stress; and / or, 40000.00MPa / mm≤CT_LD≤100000.00MPa / mm, where CT_LD refers to the tensile stress linear density.

17. The chemically strengthened glass-ceramic according to claim 16, characterized in that, 0.21≤DOL_0 / T≤0.23; and / or, 100.00μm≤DOL_0≤160.00μm; and / or, 110.00MPa≤CS_50≤250.00MPa; and / or, 80.00MPa≤|CT_AV|≤170.00MPa; and / or, 47000.00MPa / mm≤CT_LD≤95000.00MPa / mm.

18. The chemically strengthened glass-ceramic according to claim 17, characterized in that, 110.00MPa≤CS_50≤240.00MPa and / or, 80.00MPa≤|CT_AV|≤160.00MPa; and / or, 70000.00MPa / mm≤CT_LD≤95000.00MPa / mm.

19. The chemically strengthened glass-ceramic according to claim 17, characterized in that, 200.00MPa≤CS_50≤250.00MPa; and / or, 130.00MPa≤|CT_AV|≤170.00MPa.

20. The chemically strengthened glass-ceramic according to claim 15, characterized in that, The chemically strengthened microcrystalline glass satisfies: 0.20≤DOL_0 / T≤0.25, where DOL_0 is the compressive stress layer depth and T is the thickness of the chemically strengthened glass-ceramic; and / or, 90.00μm≤DOL_0≤160.00μm, where DOL_0 is the compressive stress layer depth; and / or, 100.00MPa≤CS_50≤300.00MPa, where CS_50 refers to the compressive stress value at a depth of 50μm from the main surface of the chemically strengthened glass-ceramic; and / or, 80.00MPa≤|CT_AV|≤200.00MPa, where |CT_AV| is the absolute value of the average tensile stress; and / or, 40000.00MPa / mm≤CT_LD≤100000.00MPa / mm, where CT_LD refers to the tensile stress linear density.

21. The chemically strengthened glass-ceramic according to any one of claims 1 to 3, characterized in that, The chemically strengthened glass-ceramic satisfies: 0 ≤ M(K₂O) ≤ 1.5%, 5% ≤ M(Na₂O) ≤ 25%; M(K₂O) is the mass percentage of K₂O on the surface of the chemically strengthened glass-ceramic, and M(Na₂O) is the mass percentage of Na₂O on the surface of the chemically strengthened glass-ceramic; and / or, After reducing the thickness of each of the two main surfaces of the chemically strengthened glass-ceramic by 3 μm, the resulting chemically strengthened glass-ceramic satisfies the following: the mass percentage of K2O M'(K2O) on the surface of the chemically strengthened glass-ceramic and the mass percentage of Na2O M'(Na2O) on the surface of the chemically strengthened glass-ceramic are: 0 ≤ M'(K2O) ≤ 0.5% and 4.0% ≤ M'(Na2O) ≤ 20%.

22. The chemically strengthened glass-ceramic according to claim 20, characterized in that, The chemically strengthened glass-ceramic satisfies: 0 ≤ M(K₂O) ≤ 1.5%, 5% ≤ M(Na₂O) ≤ 25%; M(K₂O) is the mass percentage of K₂O on the surface of the chemically strengthened glass-ceramic, and M(Na₂O) is the mass percentage of Na₂O on the surface of the chemically strengthened glass-ceramic; and / or, After reducing the thickness of each of the two main surfaces of the chemically strengthened glass-ceramic by 3 μm, the resulting chemically strengthened glass-ceramic satisfies the following: the mass percentage of K2O M'(K2O) on the surface of the chemically strengthened glass-ceramic and the mass percentage of Na2O M'(Na2O) on the surface of the chemically strengthened glass-ceramic are: 0 ≤ M'(K2O) ≤ 0.5% and 4.0% ≤ M'(Na2O) ≤ 20%.

23. The chemically strengthened glass-ceramic according to any one of claims 1 to 3, characterized in that, The crystallinity of the chemically strengthened microcrystalline glass is 65%~90%; and / or, In the chemically strengthened glass-ceramic, the average grain size does not exceed 100 nm; and / or, In the chemically strengthened glass-ceramic, the lithium disilicate crystalline phase accounts for 80wt%~100wt% of all crystalline phases; and / or, The mass percentage of lithium feldspar crystal phase in the chemically strengthened microcrystalline glass is less than or equal to 10%.

24. The chemically strengthened glass-ceramic according to claim 23, characterized in that, The crystallinity of the chemically strengthened microcrystalline glass is 70%~87%; and / or, In the chemically strengthened microcrystalline glass, the average grain size does not exceed 50 nm; and / or, The mass percentage of lithium feldspar crystal phase in the chemically strengthened microcrystalline glass is less than or equal to 5%.

25. The chemically strengthened glass-ceramic according to claim 24, characterized in that, In the chemically strengthened microcrystalline glass, the average grain size is 15nm~30nm; and / or, The chemically strengthened microcrystalline glass does not contain the lithium feldspar crystal phase.

26. The chemically strengthened glass-ceramic according to claim 22, characterized in that, The crystallinity of the chemically strengthened microcrystalline glass is 65%~90%; and / or, In the chemically strengthened glass-ceramic, the average grain size does not exceed 100 nm; and / or, In the chemically strengthened glass-ceramic, the lithium disilicate crystalline phase accounts for 80wt%~100wt% of all crystalline phases; and / or, The mass percentage of lithium feldspar crystal phase in the chemically strengthened microcrystalline glass is less than or equal to 10%.

27. The chemically strengthened glass-ceramic according to any one of claims 1 to 3, characterized in that, When the thickness is no more than 0.70 mm, the b-value of the chemically strengthened microcrystalline glass is < 1.0; and / or, The chemically strengthened microcrystalline glass is transparent in the visible light wavelength range.

28. The chemically strengthened glass-ceramic according to claim 27, characterized in that, When the thickness is no more than 0.70 mm, the b-value of the chemically strengthened microcrystalline glass is <0.8; and / or, For 550nm wavelength light, the transmittance of the chemically strengthened microcrystalline glass is ≥85%.

29. The chemically strengthened glass-ceramic according to claim 28, characterized in that, When the thickness is no more than 0.70 mm, the b-value of the chemically strengthened microcrystalline glass is ≤0.6; and / or, For 550nm wavelength light, the transmittance of the chemically strengthened microcrystalline glass is ≥90%.

30. The chemically strengthened microcrystalline glass according to claim 29, characterized in that, For light at a wavelength of 550 nm, the transmittance of the chemically strengthened microcrystalline glass is 90.27%.

31. The chemically strengthened microcrystalline glass according to claim 26, characterized in that, When the thickness is no more than 0.70 mm, the b-value of the chemically strengthened microcrystalline glass is < 1.0; and / or, The chemically strengthened microcrystalline glass is transparent in the visible light wavelength range.

32. The chemically strengthened glass-ceramic according to any one of claims 1 to 3, characterized in that, The chemically strengthened microcrystalline glass has a Young's modulus greater than 100 GPa; and / or, The density of the chemically strengthened microcrystalline glass is 2.51 g / cm³. 3 ~2.65g / cm 3 ; and / or, The refractive index of the chemically strengthened microcrystalline glass is ≤1.60; and / or, The thickness T of the chemically strengthened microcrystalline glass is 0.35 mm to 1.0 mm; and / or, The chemically strengthened microcrystalline glass is 2D, 2.5D, 3D, or irregularly shaped; and / or, The chemically strengthened microcrystalline glass may be of uniform or unequal thickness.

33. The chemically strengthened microcrystalline glass according to claim 32, characterized in that, The chemically strengthened microcrystalline glass has a Young's modulus greater than 105 GPa; and / or, The refractive index of the chemically strengthened microcrystalline glass is 1.54~1.60; and / or, The thickness T of the chemically strengthened microcrystalline glass is 0.4 mm to 0.7 mm.

34. The chemically strengthened microcrystalline glass according to claim 33, characterized in that, The chemically strengthened microcrystalline glass has a Young's modulus greater than 110 GPa to 130 GPa; and / or, The thickness T of the chemically strengthened microcrystalline glass is 0.45mm~0.55mm.

35. The chemically strengthened microcrystalline glass according to claim 31, characterized in that, The chemically strengthened microcrystalline glass has a Young's modulus greater than 100 GPa; and / or, The density of the chemically strengthened microcrystalline glass is 2.51 g / cm³. 3 ~2.65g / cm 3 ; and / or, The refractive index of the chemically strengthened microcrystalline glass is ≤1.60; and / or, The thickness T of the chemically strengthened microcrystalline glass is 0.35 mm to 1.0 mm; and / or, The chemically strengthened microcrystalline glass is 2D, 2.5D, 3D, or irregularly shaped; and / or, The chemically strengthened microcrystalline glass may be of uniform or unequal thickness.

36. The chemically strengthened glass-ceramic according to any one of claims 1 to 3, characterized in that, The chemically strengthened microcrystalline glass was subjected to a sandpaper drop test. The sandpaper used was 80-grit sandpaper. When the thickness did not exceed 0.70 mm, the average sandpaper drop height of the chemically strengthened microcrystalline glass was ≥1.0 m.

37. The chemically strengthened glass-ceramic according to claim 36, characterized in that, The chemically strengthened microcrystalline glass was subjected to a sandpaper drop test. The sandpaper used was 80-grit sandpaper. When the thickness did not exceed 0.70 mm, the average sandpaper drop height of the chemically strengthened microcrystalline glass was ≥1.2 m.

38. The chemically strengthened microcrystalline glass according to claim 37, characterized in that, The chemically strengthened microcrystalline glass was subjected to a sandpaper drop test. The sandpaper used was 80-grit sandpaper. When the thickness did not exceed 0.70 mm, the average sandpaper drop height of the chemically strengthened microcrystalline glass was ≥1.6 m.

39. The chemically strengthened microcrystalline glass according to claim 35, characterized in that, The chemically strengthened microcrystalline glass was subjected to a sandpaper drop test. The sandpaper used was 80-grit sandpaper. When the thickness did not exceed 0.70 mm, the average sandpaper drop height of the chemically strengthened microcrystalline glass was ≥1.0 m.

40. The chemically strengthened microcrystalline glass according to claim 8, characterized in that, The chemically strengthened glass-ceramics shown satisfy the following conditions: the value of relation A is: 150.39, 155.13, 157.8, 163.95, 165.23, 167.78, 171.98, 130.02, 148.08, 153.52, 157.87, 150.70, 161.51, 200.59, 217.59, 234.24, 208.06, 207.14, 220.07, 224.21 or 226.66; and / or, The values ​​of relation B are: 144.41, 149.14, 151.82, 157.96, 159.24, 161.80, 166.00, 148.99, 165.83, 168.65, 170.67, 163.85, 155.53, 136.18, 155.43, 172.09, 147.01, 147.17, 165.17, 164.24, or 166.69; and / or, The values ​​of relation C are: 33.97, 40.28, 37.3, 41.41, 47.67, 42.93, 45.51, 45.77, 52.74, 53.28, 51.42, 52.28, 37.27, 64.74, 70.95, 77.45, 57.85, 52.49, 67.32, 66.26, or 64.

31.

41. The chemically strengthened glass-ceramic according to any one of claims 1 to 3, characterized in that, The composition of the chemically strengthened glass-ceramic at its center or in the tensile stress layer, based on the molar percentage of oxides, comprises: The molar percentage of SiO2 is 60%~65%; and / or, The molar percentage of Al2O3 is 0.5%~2.5%; and / or, The molar percentage of P2O5 is 1%~2.8%; and / or, The molar percentage of ZrO2 is 1%~5%; and / or, The molar percentage of Li2O is 27%~31.6%; and / or, The molar percentage of Na2O is 0%~3%; and / or, The molar percentage of K2O is 0%~1%; and / or, The molar percentage of CaO is 0%~4%; and / or, The molar percentage of BaO is 0%~2%; and / or, The molar percentage of SrO is 0%~2%; and / or, The molar percentage of MgO is 0%~2%; and / or, The molar percentage of ZnO is 0%~2%; and / or, The molar percentage of B2O3 is 0%~0.7%; and / or, The molar percentage of Y₂O₃ is 0%~0.5%; and / or, The molar percentage of La2O3 is 0%~0.5%; and / or, The molar percentage of Ta₂O₅ is 0%~0.7%; and / or, The molar percentage of Yb2O3 is 0%~0.7%.

42. The chemically strengthened glass-ceramic according to claim 41, characterized in that, The composition of the chemically strengthened glass-ceramic at its center or in the tensile stress layer, based on the molar percentage of oxides, comprises: The molar percentage of SiO2 is 60.5%~64.50%; and / or, The molar percentage of Al2O3 is 1%-2%; and / or, The molar percentage of P2O5 is 1.50%-3%; and / or, The molar percentage of ZrO2 is 1.4%~5%; and / or, The molar percentage of Li2O is 27.5%~31%; and / or, The molar percentage of Na2O is 0%~1%; and / or, The molar percentage of K2O is 0%~0.7%; and / or, The molar percentage of CaO is 0%~3%; and / or, The molar percentage of BaO is 1%~2%; and / or, The molar percentage of B2O3 is 0%~0.5%; and / or, The molar percentage of Y₂O₃ is 0%~0.2%; and / or, The molar percentage of La2O3 is 0%~0.2%; and / or, The molar percentage of Ta2O5 is 0%~0.5%; and / or, The molar percentage of Yb2O3 is 0%~0.5%.

43. The chemically strengthened microcrystalline glass according to claim 41, characterized in that, The composition of the chemically strengthened glass-ceramic at its center or in the tensile stress layer, based on the molar percentage of oxides, comprises: The molar percentage of Al2O3 is 1%~1.5%; and / or, The molar percentage of P2O5 is 1.20%~2%; and / or, The molar percentage of ZrO2 is 3%-5%; and / or, The molar percentage of CaO is 0%~1%.

44. The chemically strengthened microcrystalline glass according to claim 41, characterized in that, The composition of the chemically strengthened glass-ceramic at its center or in the tensile stress layer, based on the molar percentage of oxides, comprises: The molar percentage of ZrO2 is 4%-5%.

45. The chemically strengthened microcrystalline glass according to claim 39, characterized in that, The composition of the chemically strengthened glass-ceramic at its center or in the tensile stress layer, based on the molar percentage of oxides, comprises: The molar percentage of SiO2 is 60%~65%; and / or, The molar percentage of Al2O3 is 0.5%~2.5%; and / or, The molar percentage of P2O5 is 1%~2.8%; and / or, The molar percentage of ZrO2 is 1%~5%; and / or, The molar percentage of Li2O is 27%~31.6%; and / or, The molar percentage of Na2O is 0%~3%; and / or, The molar percentage of K2O is 0%~1%; and / or, The molar percentage of CaO is 0%~4%; and / or, The molar percentage of BaO is 0%~2%; and / or, The molar percentage of SrO is 0%~2%; and / or, The molar percentage of MgO is 0%~2%; and / or, The molar percentage of ZnO is 0%~2%; and / or, The molar percentage of B2O3 is 0%~0.7%; and / or, The molar percentage of Y₂O₃ is 0%~0.5%; and / or, The molar percentage of La2O3 is 0%~0.5%; and / or, The molar percentage of Ta₂O₅ is 0%~0.7%; and / or, The molar percentage of Yb2O3 is 0%~0.7%.

46. ​​The chemically strengthened glass-ceramic according to any one of claims 1 to 3, characterized in that, The chemically strengthened microcrystalline glass satisfies: 2.00 ≤ n(SiO2) / n(Li2O) ≤ 2.40, where n(SiO2) and n(Li2O) are the molar percentage contents of SiO2 and Li2O at the center of the chemically strengthened microcrystalline glass or in the tensile stress layer, respectively; and / or, 90%≤n(SiO2)+n(Li2O)≤96%, where n(SiO2) and n(Li2O) are the molar percentage contents of SiO2 and Li2O at the center of the chemically strengthened microcrystalline glass or in the tensile stress layer, respectively; and / or, 20%≤2.25×n(Li2O)-8×n(ZrO2)-0.2×n(CaO)≤60%, where n(Li2O), n(ZrO2), and n(CaO) are the molar percentage contents of Li2O, ZrO2, and CaO at the center of the chemically strengthened microcrystalline glass or in the tensile stress layer, respectively; and / or, 0%≤n(Y₂O₃)+n(La₂O₃)+n(Ta₂O₅)+n(Yb₂O₃)≤1%, where n(Y₂O₃), n(La₂O₃), n(Ta₂O₅), and n(Yb₂O₃) are the molar percentage contents of Y₂O₃, La₂O₃, Ta₂O₅, and Yb₂O₃ respectively at the center of the chemically strengthened microcrystalline glass or in the tensile stress layer; and / or, 0%≤n(SrO)+n(BaO)+n(CaO)+n(MgO)≤3%, where n(SrO), n(BaO), n(CaO), and n(MgO) are the molar percentage contents of SrO, BaO, CaO, and MgO at the center of the chemically strengthened microcrystalline glass or in the tensile stress layer, respectively; and / or, 0≤n(SrO) / [n(SrO)+n(BaO)+n(CaO)+n(MgO)]≤1, where n(SrO), n(BaO), n(CaO), and n(MgO) are the molar percentage contents of SrO, BaO, CaO, and MgO at the center of the chemically strengthened microcrystalline glass or in the tensile stress layer, respectively.

47. The chemically strengthened microcrystalline glass according to claim 46, characterized in that, The chemically strengthened microcrystalline glass satisfies: 2.00≤n(SiO2) / n(Li2O)≤2.30; and / or, 90%≤n(SiO2)+n(Li2O)≤95%; and / or, 25%≤2.25×n(Li₂O)-8×n(ZrO₂)-0.2×n(CaO)≤60%; and / or, 0%≤n(Y₂O₃)+n(La₂O₃)+n(Ta₂O₅)+n(Yb₂O₃)≤0.7%; and / or, 0%≤n(SrO)+n(BaO)+n(CaO)+n(MgO)≤2.7%.

48. The chemically strengthened glass-ceramic according to claim 47, characterized in that, The chemically strengthened microcrystalline glass satisfies: 2.02≤n(SiO2) / n(Li2O)≤2.28; and / or, 25%≤2.25×n(Li2O)-8×n(ZrO2)-0.2×n(CaO)≤40%.

49. The chemically strengthened microcrystalline glass according to claim 48, characterized in that, The chemically strengthened microcrystalline glass satisfies: 2.07≤n(SiO2) / n(Li2O)≤2.

28.

50. The chemically strengthened microcrystalline glass according to claim 45, characterized in that, The chemically strengthened microcrystalline glass satisfies: 2.00 ≤ n(SiO2) / n(Li2O) ≤ 2.40, where n(SiO2) and n(Li2O) are the molar percentage contents of SiO2 and Li2O at the center of the chemically strengthened microcrystalline glass or in the tensile stress layer, respectively; and / or, 90%≤n(SiO2)+n(Li2O)≤96%, where n(SiO2) and n(Li2O) are the molar percentage contents of SiO2 and Li2O at the center of the chemically strengthened microcrystalline glass or in the tensile stress layer, respectively; and / or, 20%≤2.25×n(Li2O)-8×n(ZrO2)-0.2×n(CaO)≤60%, where n(Li2O), n(ZrO2), and n(CaO) are the molar percentage contents of Li2O, ZrO2, and CaO at the center of the chemically strengthened microcrystalline glass or in the tensile stress layer, respectively; and / or, 0%≤n(Y₂O₃)+n(La₂O₃)+n(Ta₂O₅)+n(Yb₂O₃)≤1%, where n(Y₂O₃), n(La₂O₃), n(Ta₂O₅), and n(Yb₂O₃) are the molar percentage contents of Y₂O₃, La₂O₃, Ta₂O₅, and Yb₂O₃ respectively at the center of the chemically strengthened microcrystalline glass or in the tensile stress layer; and / or, 0%≤n(SrO)+n(BaO)+n(CaO)+n(MgO)≤3%, where n(SrO), n(BaO), n(CaO), and n(MgO) are the molar percentage contents of SrO, BaO, CaO, and MgO at the center of the chemically strengthened microcrystalline glass or in the tensile stress layer, respectively; and / or, 0≤n(SrO) / [n(SrO)+n(BaO)+n(CaO)+n(MgO)]≤1, where n(SrO), n(BaO), n(CaO), and n(MgO) are the molar percentage contents of SrO, BaO, CaO, and MgO at the center of the chemically strengthened microcrystalline glass or in the tensile stress layer, respectively.

51. A chemically strengthened microcrystalline glass, characterized in that, The main crystalline phase of the chemically strengthened glass-ceramic is lithium disilicate; the crystallinity of the chemically strengthened glass-ceramic is not less than 65%. The surface of the chemically strengthened microcrystalline glass has a compressive stress layer, and the interior has a tensile stress layer; The composition of the center or tensile stress layer of the chemically strengthened glass-ceramic, based on the mass percentage of oxides, comprises: SiO2: 60%~75%, Al2O3: 0%~3.5%, P2O5: 2%~8%, ZrO2: 3%~12%, Li2O: 14%~20%, SrO: 0%~6%, Na2O: 0%~4%, K2O: 0%~2%, Ca O: 0%~5%, B2O3: 0%~1%, Ta2O5: 0%~2%, BaO: 0%~6%, MgO: 0%~3%, ZnO: 0%~3%, Y2O3: 0%~2%, La2O3: 0%~2%, Yb2O3: 0%~4%; The chemically strengthened glass-ceramic satisfies the following relationship: ; B=A-83989×n(ZrO2) 2 +2526.5×n(ZrO2),130≤B≤180; Where t is the depth from the main surface of the chemically strengthened glass-ceramic, and CS(t) is the compressive stress value at depth t. The stress integral of the compressive stress layer from the main surface of the chemically strengthened glass-ceramic to DOL_0 is expressed in MPa·μm. DOL_0 represents the depth of the compressive stress layer, in μm. In relation A, the data is substituted according to the above unit requirements to perform calculations and obtain the results; the units are not involved in the calculation. n(ZrO2) is the molar percentage content of ZrO2 at the center of the chemically strengthened microcrystalline glass; In relation B, the values ​​from relation A and the molar percentage of ZrO2 are substituted into the equation to perform the calculation and obtain the result. Units are not involved in the calculation.

52. The chemically strengthened microcrystalline glass according to claim 51, characterized in that, 135≤B≤180。 53. The chemically strengthened microcrystalline glass according to claim 52, characterized in that, 135≤B≤175。 54. The chemically strengthened microcrystalline glass according to any one of claims 51 to 53, characterized in that, The value of relation A satisfies: 120≤A≤250.

55. The chemically strengthened microcrystalline glass according to claim 54, characterized in that, 130≤A≤240。 56. The chemically strengthened glass-ceramic according to claim 55, characterized in that, 130≤A≤235。 57. The chemically strengthened microcrystalline glass according to claim 55, characterized in that, 190≤A≤240。 58. The chemically strengthened microcrystalline glass according to any one of claims 51 to 53, characterized in that, The chemically strengthened glass-ceramic satisfies the following relationship: C=A-|CT_AV|, 30≤C≤90, where |CT_AV| is the absolute value of the average tensile stress in MPa.

59. The chemically strengthened microcrystalline glass according to claim 58, characterized in that, 30≤C≤85。 60. The chemically strengthened microcrystalline glass according to claim 59, characterized in that, 30≤C≤80。 61. The chemically strengthened glass-ceramic according to claim 60, characterized in that, 50≤C≤80。 62. The chemically strengthened glass-ceramic according to claim 54, characterized in that, The chemically strengthened glass-ceramic satisfies the following relationship: C=A-|CT_AV|, 30≤C≤90, where |CT_AV| is the absolute value of the average tensile stress in MPa.

63. The chemically strengthened glass-ceramic according to any one of claims 51 to 53, characterized in that, The chemically strengthened glass-ceramic satisfies the following relationship: 2.0 ≤ |K 0.5×DOL_0 |≤6.0, where |K 0.5×DOL_0 |The absolute value of the slope of the stress curve at a depth t = 0.5 × DOL_0 from the main surface of the chemically strengthened glass-ceramic.

64. The chemically strengthened microcrystalline glass according to claim 63, characterized in that, 3.5≤|K 0.5×DOL_0 |≤5.0。 65. The chemically strengthened glass-ceramic according to claim 62, characterized in that, The chemically strengthened glass-ceramic satisfies the following relationship: 2.0 ≤ |K 0.5×DOL_0 |≤6.0, where |K 0.5×DOL_0 |The absolute value of the slope of the stress curve at a depth t = 0.5 × DOL_0 from the main surface of the chemically strengthened glass-ceramic.

66. The chemically strengthened microcrystalline glass according to any one of claims 51 to 53, characterized in that, The chemically strengthened microcrystalline glass satisfies: 0.20≤DOL_0 / T≤0.25, where DOL_0 is the compressive stress layer depth and T is the thickness of the chemically strengthened glass-ceramic; and / or, 90.00μm≤DOL_0≤160.00μm, where DOL_0 is the compressive stress layer depth; and / or, 100.00MPa≤CS_50≤300.00MPa, where CS_50 refers to the compressive stress value at a depth of 50μm from the main surface of the chemically strengthened glass-ceramic; and / or, 80.00MPa≤|CT_AV|≤200.00MPa, where |CT_AV| is the absolute value of the average tensile stress; and / or, 40000.00MPa / mm≤CT_LD≤100000.00MPa / mm, where CT_LD refers to the tensile stress linear density.

67. The chemically strengthened microcrystalline glass according to claim 66, characterized in that, 0.21≤DOL_0 / T≤0.23; and / or, 100.00μm≤DOL_0≤160.00μm; and / or, 110.00MPa≤CS_50≤250.00MPa; and / or, 80.00MPa≤|CT_AV|≤170.00MPa; and / or, 47000.00MPa / mm≤CT_LD≤95000.00MPa / mm.

68. The chemically strengthened microcrystalline glass according to claim 67, characterized in that, 110.00MPa≤CS_50≤240.00MPa and / or, 80.00MPa≤|CT_AV|≤160.00MPa; and / or, 70000.00MPa / mm≤CT_LD≤95000.00MPa / mm.

69. The chemically strengthened microcrystalline glass according to claim 67, characterized in that, 200.00MPa≤CS_50≤250.00MPa; and / or, 130.00MPa≤|CT_AV|≤170.00MPa.

70. The chemically strengthened microcrystalline glass according to claim 65, characterized in that, The chemically strengthened microcrystalline glass satisfies: 0.20≤DOL_0 / T≤0.25, where DOL_0 is the compressive stress layer depth and T is the thickness of the chemically strengthened glass-ceramic; and / or, 90.00μm≤DOL_0≤160.00μm, where DOL_0 is the compressive stress layer depth; and / or, 100.00MPa≤CS_50≤300.00MPa, where CS_50 refers to the compressive stress value at a depth of 50μm from the main surface of the chemically strengthened glass-ceramic; and / or, 80.00MPa≤|CT_AV|≤200.00MPa, where |CT_AV| is the absolute value of the average tensile stress; and / or, 40000.00MPa / mm≤CT_LD≤100000.00MPa / mm, where CT_LD refers to the tensile stress linear density.

71. The chemically strengthened microcrystalline glass according to any one of claims 51 to 53, characterized in that, The chemically strengthened glass-ceramic satisfies: 0 ≤ M(K₂O) ≤ 1.5%, 5% ≤ M(Na₂O) ≤ 25%; M(K₂O) is the mass percentage of K₂O on the surface of the chemically strengthened glass-ceramic, and M(Na₂O) is the mass percentage of Na₂O on the surface of the chemically strengthened glass-ceramic; and / or, After reducing the thickness of each of the two main surfaces of the chemically strengthened glass-ceramic by 3 μm, the resulting chemically strengthened glass-ceramic satisfies the following: the mass percentage of K2O M'(K2O) on the surface of the chemically strengthened glass-ceramic and the mass percentage of Na2O M'(Na2O) on the surface of the chemically strengthened glass-ceramic are: 0 ≤ M'(K2O) ≤ 0.5% and 4.0% ≤ M'(Na2O) ≤ 20%.

72. The chemically strengthened glass-ceramic according to claim 70, characterized in that, The chemically strengthened glass-ceramic satisfies: 0 ≤ M(K₂O) ≤ 1.5%, 5% ≤ M(Na₂O) ≤ 25%; M(K₂O) is the mass percentage of K₂O on the surface of the chemically strengthened glass-ceramic, and M(Na₂O) is the mass percentage of Na₂O on the surface of the chemically strengthened glass-ceramic; and / or, After reducing the thickness of each of the two main surfaces of the chemically strengthened glass-ceramic by 3 μm, the resulting chemically strengthened glass-ceramic satisfies the following: the mass percentage of K2O M'(K2O) on the surface of the chemically strengthened glass-ceramic and the mass percentage of Na2O M'(Na2O) on the surface of the chemically strengthened glass-ceramic are: 0 ≤ M'(K2O) ≤ 0.5% and 4.0% ≤ M'(Na2O) ≤ 20%.

73. The chemically strengthened microcrystalline glass according to any one of claims 51 to 53, characterized in that, The crystallinity of the chemically strengthened microcrystalline glass is 65%~90%; and / or, In the chemically strengthened glass-ceramic, the average grain size does not exceed 100 nm; and / or, In the chemically strengthened glass-ceramic, the lithium disilicate crystalline phase accounts for 80wt%~100wt% of all crystalline phases; and / or, The mass percentage of lithium feldspar crystal phase in the chemically strengthened microcrystalline glass is less than or equal to 10%.

74. The chemically strengthened microcrystalline glass according to claim 73, characterized in that, The crystallinity of the chemically strengthened microcrystalline glass is 70%~87%; and / or, In the chemically strengthened microcrystalline glass, the average grain size does not exceed 50 nm; and / or, The mass percentage of lithium feldspar crystal phase in the chemically strengthened microcrystalline glass is less than or equal to 5%.

75. The chemically strengthened microcrystalline glass according to claim 74, characterized in that, In the chemically strengthened microcrystalline glass, the average grain size is 15nm~30nm; and / or, The chemically strengthened microcrystalline glass does not contain the lithium feldspar crystal phase.

76. The chemically strengthened microcrystalline glass according to claim 72, characterized in that, The crystallinity of the chemically strengthened microcrystalline glass is 65%~90%; and / or, In the chemically strengthened glass-ceramic, the average grain size does not exceed 100 nm; and / or, In the chemically strengthened glass-ceramic, the lithium disilicate crystalline phase accounts for 80wt%~100wt% of all crystalline phases; and / or, The mass percentage of lithium feldspar crystal phase in the chemically strengthened microcrystalline glass is less than or equal to 10%.

77. The chemically strengthened microcrystalline glass according to any one of claims 51 to 53, characterized in that, When the thickness is no more than 0.70 mm, the b-value of the chemically strengthened microcrystalline glass is < 1.0; and / or, The chemically strengthened microcrystalline glass is transparent in the visible light wavelength range.

78. The chemically strengthened glass-ceramic according to claim 77, characterized in that, When the thickness is no more than 0.70 mm, the b-value of the chemically strengthened microcrystalline glass is <0.8; and / or, For 550nm wavelength light, the transmittance of the chemically strengthened microcrystalline glass is ≥85%.

79. The chemically strengthened microcrystalline glass according to claim 78, characterized in that, When the thickness is no more than 0.70 mm, the b-value of the chemically strengthened microcrystalline glass is ≤0.6; and / or, For 550nm wavelength light, the transmittance of the chemically strengthened microcrystalline glass is ≥90%.

80. The chemically strengthened glass-ceramic according to claim 79, characterized in that, For light at a wavelength of 550 nm, the transmittance of the chemically strengthened microcrystalline glass is 90.27%.

81. The chemically strengthened microcrystalline glass according to claim 76, characterized in that, When the thickness is no more than 0.70 mm, the b-value of the chemically strengthened microcrystalline glass is < 1.0; and / or, The chemically strengthened microcrystalline glass is transparent in the visible light wavelength range.

82. The chemically strengthened microcrystalline glass according to any one of claims 51 to 53, characterized in that, The chemically strengthened microcrystalline glass has a Young's modulus greater than 100 GPa; and / or, The density of the chemically strengthened microcrystalline glass is 2.51 g / cm³. 3 ~2.65g / cm 3 ; and / or, The refractive index of the chemically strengthened microcrystalline glass is ≤1.60; and / or, The thickness T of the chemically strengthened microcrystalline glass is 0.35 mm to 1.0 mm; and / or, The chemically strengthened microcrystalline glass is 2D, 2.5D, 3D, or irregularly shaped; and / or, The chemically strengthened microcrystalline glass may be of uniform or unequal thickness.

83. The chemically strengthened microcrystalline glass according to claim 82, characterized in that, The chemically strengthened microcrystalline glass has a Young's modulus greater than 105 GPa; and / or, The refractive index of the chemically strengthened microcrystalline glass is 1.54~1.60; and / or, The thickness T of the chemically strengthened microcrystalline glass is 0.4 mm to 0.7 mm.

84. The chemically strengthened microcrystalline glass according to claim 83, characterized in that, The chemically strengthened microcrystalline glass has a Young's modulus greater than 110 GPa to 130 GPa; and / or, The thickness T of the chemically strengthened microcrystalline glass is 0.45mm~0.55mm.

85. The chemically strengthened microcrystalline glass according to claim 81, characterized in that, The chemically strengthened microcrystalline glass has a Young's modulus greater than 100 GPa; and / or, The density of the chemically strengthened microcrystalline glass is 2.51 g / cm³. 3 ~2.65g / cm 3 ; and / or, The refractive index of the chemically strengthened microcrystalline glass is ≤1.60; and / or, The thickness T of the chemically strengthened microcrystalline glass is 0.35 mm to 1.0 mm; and / or, The chemically strengthened microcrystalline glass is 2D, 2.5D, 3D, or irregularly shaped; and / or, The chemically strengthened microcrystalline glass may be of uniform or unequal thickness.

86. The chemically strengthened microcrystalline glass according to any one of claims 51 to 53, characterized in that, The chemically strengthened microcrystalline glass was subjected to a sandpaper drop test. The sandpaper used was 80-grit sandpaper. When the thickness did not exceed 0.70 mm, the average sandpaper drop height of the chemically strengthened microcrystalline glass was ≥1.0 m.

87. The chemically strengthened microcrystalline glass according to claim 86, characterized in that, The chemically strengthened microcrystalline glass was subjected to a sandpaper drop test. The sandpaper used was 80-grit sandpaper. When the thickness did not exceed 0.70 mm, the average sandpaper drop height of the chemically strengthened microcrystalline glass was ≥1.2 m.

88. The chemically strengthened microcrystalline glass according to claim 87, characterized in that, The chemically strengthened microcrystalline glass was subjected to a sandpaper drop test. The sandpaper used was 80-grit sandpaper. When the thickness did not exceed 0.70 mm, the average sandpaper drop height of the chemically strengthened microcrystalline glass was ≥1.6 m.

89. The chemically strengthened microcrystalline glass according to claim 85, characterized in that, The chemically strengthened microcrystalline glass was subjected to a sandpaper drop test. The sandpaper used was 80-grit sandpaper. When the thickness did not exceed 0.70 mm, the average sandpaper drop height of the chemically strengthened microcrystalline glass was ≥1.0 m.

90. The chemically strengthened microcrystalline glass according to claim 58, characterized in that, The chemically strengthened glass-ceramics shown satisfy the following conditions: the value of relation A is: 150.39, 155.13, 157.8, 163.95, 165.23, 167.78, 171.98, 130.02, 148.08, 153.52, 157.87, 150.70, 161.51, 200.59, 217.59, 234.24, 208.06, 207.14, 220.07, 224.21 or 226.66; and / or, The values ​​of relation B are: 144.41, 149.14, 151.82, 157.96, 159.24, 161.80, 166.00, 148.99, 165.83, 168.65, 170.67, 163.85, 155.53, 136.18, 155.43, 172.09, 147.01, 147.17, 165.17, 164.24, or 166.69; and / or, The values ​​of relation C are: 33.97, 40.28, 37.3, 41.41, 47.67, 42.93, 45.51, 45.77, 52.74, 53.28, 51.42, 52.28, 37.27, 64.74, 70.95, 77.45, 57.85, 52.49, 67.32, 66.26, or 64.

31.

91. The chemically strengthened microcrystalline glass according to any one of claims 51 to 53, characterized in that, The composition of the center or tensile stress layer of the chemically strengthened glass-ceramic, based on the mass percentage of oxides, comprises: The mass percentage of SiO2 is 60%~71%; and / or, The mass percentage of Al2O3 is 1%~3.5%; and / or, The mass percentage of P2O5 is 3%~6%; and / or, The mass percentage of ZrO2 is 4%~11%; and / or, The mass percentage of Li2O is 14%~18%; and / or, The mass percentage of Na2O is 0%~2.8%; and / or, The mass percentage of K2O is 0%~1.5%; and / or, The mass percentage of CaO is 0%~3%; and / or, The mass percentage of BaO is 0%~5.5%; and / or, The mass percentage of SrO is 0%~5%; and / or, The mass percentage of MgO is 0%~2%; and / or, The ZnO mass percentage is 0%~2.5%; and / or, The mass percentage of B2O3 is 0%~0.8%; and / or, The mass percentage of Y2O3 is 0%~1%; and / or, The mass percentage of La2O3 is 0%~1.5%; and / or, The mass percentage of Ta2O5 is 0%~1.5%; and / or, The mass percentage of Yb2O3 is 0%~3.5%.

92. The chemically strengthened microcrystalline glass according to claim 91, characterized in that, The composition of the center or tensile stress layer of the chemically strengthened glass-ceramic, based on the mass percentage of oxides, comprises: The mass percentage of SiO2 is 62%~68%; and / or, The mass percentage of Al2O3 is 1%~3%; and / or, The mass percentage of P2O5 is 3.5%~5.5%; and / or, The ZrO2 mass percentage is 9%~10.5%; and / or, The mass percentage of Li2O is 14%~17.5%; and / or, The mass percentage of Na2O is 0%~1%; and / or, The mass percentage of K2O is 0%~1%; and / or, The mass percentage of CaO is 0%~1%; and / or, The mass percentage of BaO is 0%~5%; and / or, The mass percentage of SrO is 0%~3.5%; and / or, The mass percentage of B2O3 is 0%~0.5%; and / or, The mass percentage of Y2O3 is 0%~0.8%; and / or, The mass percentage of La2O3 is 0%~1%; and / or, The mass percentage of Ta2O5 is 0%~0.5%; and / or, The mass percentage of Yb2O3 is 0%~3%.

93. The chemically strengthened microcrystalline glass according to claim 92, characterized in that, The composition of the center or tensile stress layer of the chemically strengthened glass-ceramic, based on the mass percentage of oxides, comprises: The mass percentage of Al2O3 is 2%~3%; and / or, The mass percentage of Li2O is 14%~16%.

94. A cover glass, characterized in that, The cover glass comprises chemically strengthened microcrystalline glass as described in any one of claims 1-93.

95. An electronic device, characterized in that, The electronic device comprises chemically strengthened microcrystalline glass as described in any one of claims 1-93.

96. The electronic device according to claim 95, characterized in that, The electronic device includes a housing assembled on the outside of the electronic device, the housing comprising chemically strengthened microcrystalline glass as claimed in any one of claims 1-93.

97. The electronic device according to claim 96, characterized in that, The housing includes a display cover assembled on the front side of the electronic device, the display cover comprising chemically strengthened microcrystalline glass as claimed in any one of claims 1-93.

98. The electronic device according to claim 96 or 97, characterized in that, The housing includes a rear cover assembled on the rear side of the electronic device, the rear cover comprising chemically strengthened microcrystalline glass as claimed in any one of claims 1-93.

99. The electronic device according to any one of claims 96 to 97, characterized in that, The electronic device further includes a camera assembly located inside the housing, the housing including a camera protective cover covering the camera assembly, the camera protective cover comprising chemically strengthened microcrystalline glass as claimed in any one of claims 1-93.

100. The electronic device according to any one of claims 96 to 97, characterized in that, The electronic device further includes a mid-frame, the mid-frame comprising chemically strengthened microcrystalline glass as claimed in any one of claims 1-93.

101. A glass device, characterized in that, The glass device comprises chemically strengthened microcrystalline glass as described in any one of claims 1-93.

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