Chemically strengthened microcrystalline glass, 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; by making the tensile stress linear density value of the chemically strengthened microcrystalline glass and the ratio of the stress integral of the tensile stress layer close to the middle position to the thickness t satisfy a specific difference relationship, the internal stress distribution of the chemically strengthened microcrystalline glass can be ensured to be safer under the condition that the chemically strengthened microcrystalline glass has a relatively high overall stress level, so that the chemically strengthened microcrystalline glass can be kept in a safe stress state.

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] Lithium disilicate glass-ceramics are a type of glass-ceramic with lithium disilicate as the main crystalline phase. Within the glass-ceramic, the lithium disilicate crystals exhibit a randomly oriented, interlocking microstructure, which forces cracks to distort their path as they pass through the crystals, thus inhibiting crack propagation and improving the strength and fracture toughness of the glass-ceramic. Furthermore, the optical refractive index of lithium disilicate crystals is close to that of the glass matrix, making it an ideal crystalline phase for preparing highly transparent glass-ceramics. Therefore, lithium disilicate glass-ceramics have significant application potential in the cover glass market for electronic devices.

[0003] With the continuous development of the industry, the demand for ultra-thin designs in electronic devices is becoming increasingly prominent, and there is a desire to make the glass used as cover glass in electronic devices (such as mobile phones, watches, and tablets) as thin as possible. Therefore, in order to meet the usage requirements of electronic devices, such as meeting high-performance requirements for drop resistance, pressure resistance, scratch resistance, and abrasion resistance, it is usually necessary to chemically strengthen the glass used as cover glass to prepare reinforced microcrystalline glass with a certain stress level. By utilizing the obtained stress level combined with its own inherent strength, the reinforced microcrystalline glass can resist external forces, thereby preventing damage and further improving its anti-damage performance. Superior anti-damage performance often requires the cover glass to have a high stress level. Summary of the Invention

[0004] Unconstrained by any theoretical limitations, the inventors discovered that for lithium disilicate glass-ceramics with high lithium content, increasing the overall stress level does not necessarily guarantee excellent damage resistance. If the strengthening process focuses solely on increasing the overall stress level without considering the stress distribution, the resulting chemically strengthened glass-ceramics often suffers from unsuitable stress distribution, leading to a "reduced strengthening stability." Increasing the overall stress level can cause excessive tensile stress in certain internal areas. Such a stress distribution not only fails to ensure excellent damage resistance but also poses safety hazards. Chemically strengthened glass-ceramics are prone to explosive cracking under slight impacts, with small fragments easily scattering and even spontaneously combusting. This severely impacts the reliability of chemically strengthened glass-ceramics products and poses a serious threat to user safety.

[0005] In view of this, for glass-ceramics with lithium disilicate as the main crystalline phase, this application makes the prepared chemically strengthened glass-ceramics meet specific stress characteristics, so that the chemically strengthened glass-ceramics have a specific stress distribution structure. While ensuring the improvement of the mechanical strength performance and damage resistance of the chemically strengthened glass-ceramics, the chemically strengthened glass-ceramics maintain a safe stress state and have high safety performance.

[0006] This application provides a chemically strengthened microcrystalline glass, as well as a cover glass, electronic device, and glass device incorporating the chemically strengthened microcrystalline glass. The chemically strengthened microcrystalline glass satisfies specific crystal phase and stress distribution structures, giving it both excellent damage resistance (such as excellent drop resistance) and high safety performance. The "high safety performance" is mainly reflected in the fact that when the chemically strengthened microcrystalline glass breaks upon impact, the resulting fragments are relatively large, preventing the formation of numerous small fragments that easily scatter, thus avoiding safety hazards. When this chemically strengthened microcrystalline glass is used as a cover glass for a display screen, it can also meet emergency use requirements after a drop breakage.

[0007] Specifically, the technical solution provided in this application includes:

[0008] In a first aspect, a chemically strengthened glass-ceramic is provided, the glass-ceramic comprising a lithium disilicate phase, wherein the lithium disilicate phase has a higher mass percentage than other phases present in the chemically strengthened glass-ceramic.

[0009] The surface of the chemically strengthened microcrystalline glass has a compressive stress layer, and the interior has a tensile stress layer;

[0010] The chemically strengthened glass-ceramic satisfies the following relationship:

[0011] A≥49500, preferably A≥50000, more preferably A≥51000, and even more preferably A is 49500~65000;

[0012] Wherein, CT_LD is the tensile stress linear density, in MPa / mm, and CT_LD ≥ 60000 MPa / mm.

[0013] t represents the thickness of the chemically strengthened glass-ceramic, in mm.

[0014] The stress integral of the tensile stress layer along the thickness direction of the chemically strengthened glass-ceramic, from a distance of 2 times DOL_0 from the main surface of the chemically strengthened glass-ceramic to half the thickness of the chemically strengthened glass-ceramic, is expressed as the ratio to the thickness t, in MPa / mm, where x is the depth from the main surface of the chemically strengthened glass-ceramic.

[0015] In relation A, the data is substituted according to the above unit requirements to perform the calculation and obtain the result. The unit is not involved in the calculation. The value of A represents the tensile stress linear density (in this application, the tensile stress linear density value is basically the ratio of the definite integral of the tensile stress curve to the thickness of the chemically strengthened microcrystalline glass) minus the ratio of the stress integral of the tensile stress layer from a distance of 2 times DOL_0 from the main surface of the chemically strengthened microcrystalline glass to half the thickness of the chemically strengthened microcrystalline glass to the thickness t.

[0016] This application achieves a specific stress distribution structure in chemically strengthened glass-ceramics by ensuring that the tensile stress linear density value of the predominantly lithium disilicate phase and the ratio of the stress integral of the tensile stress layer near the center to its thickness t satisfy a specific difference relationship. This ensures a high overall stress level while guaranteeing a safer internal stress distribution, thus maintaining a safe stress state. The chemically strengthened glass-ceramics of this application not only achieves excellent damage resistance, such as excellent drop resistance, but also possesses high safety performance. When broken by impact, the resulting fragments are relatively large, preventing the formation of numerous small, easily scattered fragments and avoiding safety hazards. Furthermore, it meets emergency use requirements after breakage.

[0017] In some embodiments of this application, the chemically strengthened glass crystal satisfies the following relationship:

[0018] B=[|CT_AV|×(t / 2-DOL_0)]×[5×M K2O / (5×M K2O +0.5×M Na2O B≥9000MPa·μm

[0019] Preferably, B ≥ 9100 MPa·μm, more preferably, B ≥ 9200 MPa·μm, and even more preferably, the value of B is 9000 MPa·μm to 13000 MPa·μm;

[0020] Where |CT_AV| is the absolute value of the average tensile stress,

[0021] t represents the thickness of the chemically strengthened glass-ceramic.

[0022] M K2O This represents the mass percentage of K2O on the surface of chemically strengthened glass-ceramics.

[0023] M Na2O The percentage by mass of Na2O on the surface of chemically strengthened glass-ceramics.

[0024] This application achieves a better stress level in chemically strengthened glass-ceramics by satisfying a specific relationship between the stress characteristics and surface component content, thus ensuring that the glass-ceramics have good resistance to monobar static pressure and high hardness.

[0025] In some embodiments of this application, the value of relation A is: 54802.89, 51024.81, 57170.35, 52689.22, 52272.54, 58526.63, 54807.04, 56429.32, 52815.28, 53580.63, 54032.42, 54060.10, 53361.40, or 54841.31.

[0026] In some embodiments of this application, the value of relation B is: 10333.74 MPa·μm, 11642.77 MPa·μm, 11864.03 MPa·μm, 10818.69 MPa·μm, 10199.45 MPa·μm, 10638.55 MPa·μm, 10862.45 MPa·μm, 9442.20 MPa·μm, 9292.34 MPa·μm, 10157.90 MPa·μm, 10637.99 MPa·μm, 10907.18 MPa·μm, 10429.05 MPa·μm, or 11586.62 MPa·μm.

[0027] In some embodiments of this application, the chemically strengthened microcrystalline glass satisfies the following relationship: C = CS_50 / |CT_CV|, C ≥ 0.85, preferably 0.85–1.5, more preferably 0.9–1.3, and even more preferably 0.9–1.2; where CS_50 refers to the compressive stress value at a depth of 50 μm from the main surface of the chemically strengthened microcrystalline glass, in MPa, and |CT_CV| is the absolute value of the maximum tensile stress, in MPa. This application, by ensuring a specific relationship between the stress characteristics of the chemically strengthened microcrystalline glass, facilitates a better stress level, thereby ensuring that even after breakage, the fragments are relatively large, preventing the formation of numerous small fragments that easily scatter, thus avoiding safety hazards. When this chemically strengthened microcrystalline glass is used as the cover glass for a display screen, it can also meet emergency use requirements after a drop and breakage.

[0028] In some embodiments of this application, the value of relation C is: 0.93, 1.12, 1.00, 0.97, 1.03, 0.99, 1.01, 0.98, 0.92, 1.05 or 1.06.

[0029] In some embodiments of this application, the chemically strengthened glass crystal satisfies:

[0030] 140.00MPa≤CS_50, preferably, 180.00MPa≤CS_50, more preferably, 180.00MPa≤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,

[0031] 90.00μm≤DOL_0, preferably, 100.00μm≤DOL_0, more preferably, 100.00μm≤DOL_0≤160.00μm, where DOL_0 is the compressive stress layer depth; and / or,

[0032] 0.18≤DOL_0 / t, preferably, 0.20≤DOL_0 / t≤0.25, more preferably, 0.22≤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,

[0033] 150MPa≤|CT_CV|, preferably, 150MPa≤|CT_CV|≤250MPa, more preferably, 180MPa≤|CT_CV|≤250MPa, where |CT_CV| is the absolute value of the maximum tensile stress; and / or,

[0034] 100.00MPa≤|CT_AV|, preferably, 100.00MPa≤|CT_AV|≤160.00MPa, more preferably, 130.00MPa≤|CT_AV|≤160.00MPa, where |CT_AV| is the absolute value of the average tensile stress; and / or,

[0035] 65000.00MPa / mm≤CT_LD≤90000.00MPa / mm, more preferably, 70000.00MPa / mm≤CT_LD≤90000.00MPa / mm, where CT_LD refers to the tensile stress linear density; and / or,

[0036] M K2O ≤3.0%, preferably 0.2% to 2%, more preferably 0.3% to 1.6%, wherein M K2O The mass percentage of K2O on the surface of chemically strengthened glass-ceramics; and / or,

[0037] M Na2O ≥5.0%, preferably 5.0% to 20%, more preferably 6% to 17%, wherein M Na2OThe percentage of Na₂O on the surface of the chemically strengthened glass-ceramic is indicated. This application facilitates the production of chemically strengthened glass-ceramic products with high stress levels by enabling the glass-ceramic to meet suitable stress characteristics and / or surface composition characteristics. This, in turn, allows the stress characteristics to improve mechanical strength properties, resulting in chemically strengthened glass-ceramic products with excellent damage resistance and high safety performance.

[0038] In some embodiments of this application, after thinning the two main surfaces of the chemically strengthened glass-ceramic by 3 μm each, the resulting chemically strengthened glass-ceramic satisfies the following: the mass percentage M' of K2O on the surface of the chemically strengthened glass-ceramic. K2O The mass percentage M' of Na2O on the surface of the chemical microcrystalline glass Na2O for:

[0039] M' K2O <3.0%, preferably 0.0% to 1%, more preferably 0.1% to 0.5%,

[0040] M' Na2O <15.0%, preferably 3.0% to 14%, more preferably 4% to 12%.

[0041] In some embodiments of this application, the chemically strengthened glass crystal satisfies:

[0042] CS_50 is 210.89MPa, 216.96MPa, 216.18MPa, 217.56MPa, 216.54MPa, 214.69MPa, 217.72MPa, 218.14MPa, 216.14MPa, 212.31MPa, 213.77MPa, 215.64MPa, 201.79MPa, or 213.58MPa. CS_50 refers to the compressive stress value at a depth of 50μm from the main surface of the chemically strengthened glass-ceramic.

[0043] In some embodiments of this application, DOL_0 is 110.04μm, 107.70μm, 109.97μm, 109.32μm, 109.13μm, 109.87μm, 109.42μm, 110.63μm, 109.11μm, 108.94μm, 111.27μm, 106.65μm, or 119.97μm, where DOL_0 is the compressive stress layer depth.

[0044] In some embodiments of this application, DOL_0 / t is 0.18, 0.19, 0.20, 0.21, 0.24, 0.25, 0.22 or 0.23, where DOL_0 is the compressive stress layer depth and t is the thickness of the chemically strengthened glass-ceramic.

[0045] In some embodiments of this application, |CT_CV| is 226.68 MPa, 193.35 MPa, 215.52 MPa, 224.35 MPa, 209.26 MPa, 217.21 MPa, 216.52 MPa, 222.24 MPa, 234.28 MPa, 202.79 MPa, 201.74 MPa, 218.25 MPa, 219.42 MPa, or 207.75 MPa, where |CT_CV| is the absolute value of the maximum tensile stress of the chemically strengthened glass crystal.

[0046] In some embodiments of this application, |CT_AV| is 145.28 MPa, 135.44 MPa, 147.26 MPa, 142.53 MPa, 138.79 MPa, 150.24 MPa, 144.35 MPa, 146.02 MPa, 142.02 MPa, 139.69 MPa, 140.56 MPa, 139.63 MPa, 142.25 MPa, or 138.91 MPa, where |CT_AV| is the absolute value of the average tensile stress.

[0047] In some embodiments of this application, CT_LD is 81333.56MPa / mm, 77092.45MPa / mm, 82483.27MPa / mm, 80204.48MPa / mm, 78205.39MPa / mm, 84212.52MPa / mm, 81170.89MPa / mm, 81403.23MPa / mm, 79173.31MPa / mm, 78723.70MPa / mm, 79309.57MPa / mm, 77483.48MPa / mm, 77692.71MPa / mm, or 72249.87MPa / mm, where CT_LD refers to the tensile stress linear density.

[0048] In some embodiments of this application, M Na2O The percentages were 12.87%, 7.93%, 10.85%, 12.63%, 13.02%, 13.63%, 15.25%, 16.16%, 12.75%, 12.18%, 11.95%, 11.26%, or 12.14%, where M... Na2O The percentage by mass of Na2O on the surface of chemically strengthened glass-ceramics.

[0049] In some embodiments of this application, M K2O The percentages are 1.33%, 1.21%, 1.47%, 1.48%, 1.42%, 1.57%, 1.32%, 1.43%, 1.36%, 1.41%, 1.54%, 1.5%, or 1.52%, where MK2O The percentage by mass of K2O on the surface of chemically strengthened glass-ceramics.

[0050] In some embodiments of this application, M' K2O The percentages are 0.300%, 0.289%, 0.318%, 0.321%, 0.315%, 0.301%, 0.326%, 0.305%, 0.322%, 0.319%, or 0.325%, where M' K2O The mass percentage of K2O on the surface of the chemically strengthened glass-ceramic after thinning the two main surfaces by 3 μm along the thickness direction is obtained.

[0051] In some embodiments of this application, M' Na2O The percentages were 8.40%, 5.03%, 6.78%, 8.31%, 8.86%, 8.81%, 9.02%, 9.55%, 9.71%, 8.36%, 8.07%, 8.01%, 7.83%, or 8.08%, where M' Na2O The mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic after thinning the two main surfaces by 3 μm along the thickness direction is obtained.

[0052] 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:

[0053] SiO2: 58%–66%, Al2O3: 0%–3.5%, P2O5: 1%–2.5%, ZrO2: 3.5%–5.5%, Li2O: 22%–32%, SrO: 0%–2.5%, Na2O: 0%–3%. In this application, by adjusting and controlling the content range of each oxide component, it is beneficial to ensure that chemically strengthened glass-ceramics that meet the desired crystal phase structure and stress structure are obtained.

[0054] In some embodiments of this application, the composition at the center of the chemically strengthened glass crystal, based on the molar percentage of oxides, further comprises:

[0055] K2O: 0% to 1%, CaO: 0% to 1.5%, B2O3: 0% to 1%, Ta2O5: 0% to 1%, BaO: 0% to 2.5%.

[0056] 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:

[0057] The molar percentage of SiO2 is 60%–65%, preferably 60.5%–64.50%; and / or,

[0058] The molar percentage of Al2O3 is 1% to 3.5%, preferably 1.00% to 2.5%, more preferably 1% to 1.5%; and / or,

[0059] The molar percentage of P2O5 is 1.00% to 2%, preferably 1.20% to 2%; and / or,

[0060] The molar percentage of ZrO2 is 4%–5%, preferably 4.20%–5%; and / or,

[0061] The molar percentage of Li2O is 23%–31%, preferably 24%–30%, more preferably 27%–30%; and / or,

[0062] The molar percentage of SrO is 0% to 2%, preferably 0% to 1.9%; and / or,

[0063] The molar percentage of Na₂O is 0%–2.6%, preferably 0%–1%; and / or,

[0064] The molar percentage of K2O is 0% to 0.7%, preferably 0% to 0.5%; and / or,

[0065] The molar percentage of CaO is 0% to 1%, preferably 0% to 0.95%; and / or,

[0066] The molar percentage of B2O3 is 0% to 0.7%, preferably 0% to 0.5%; and / or,

[0067] The molar percentage of Ta2O5 is 0% to 0.7%, preferably 0% to 0.5%; and / or,

[0068] The molar percentage of BaO is 0% to 2%, preferably 0% to 1.9%.

[0069] 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:

[0070] SiO2 content is 60.94%, 61.15%, 61.22%, 61.43%, 61.72%, or 62.22%; and / or,

[0071] Al2O3 content is 1.22%, 1.37%, 1.38%, or 1.4%; and / or,

[0072] P2O5 is 1.82%, 1.83%, 1.84%, 1.85%, or 1.86%; and / or,

[0073] ZrO2 content is 4.47%, 4.57%, 4.59%, 4.6%, 4.61%, or 4.66%; and / or,

[0074] The Li2O content is 29.25%, 29.38%, 29.39%, 29.4%, or 29.52%; and / or,

[0075] SrO is 0%, 1.38%, or 1.83%; and / or,

[0076] Na₂O is 0% or 0.46%; and / or,

[0077] K2O is 0% or 0.46%; and / or,

[0078] CaO is 0% or 0.92%; and / or,

[0079] B2O3 is 0%, 0.2%, or 0.46%; and / or,

[0080] Ta2O5 is 0% or 0.46%; and / or,

[0081] BaO content was 0%, 1.37%, 1.38%, or 1.83%.

[0082] In some embodiments of this application, the chemically strengthened glass crystal satisfies:

[0083] 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; and / or,

[0084] The content of SiO2 and Li2O is 90% ≤ n(SiO2) + n(Li2O) ≤ 95%, preferably 90% ≤ n(SiO2) + n(Li2O) ≤ 92%; where n(SiO2) is the molar percentage content of SiO2 at the center of the chemically strengthened glass-ceramic, and n(Li2O) is the molar percentage content of Li2O at the center of the chemically strengthened glass-ceramic. In this application, by adjusting and controlling the content relationship between SiO2 and Li2O, it is beneficial to ensure that a glass-ceramic with lithium disilicate as the main crystal phase structure that meets the desired performance is obtained, while also facilitating the realization of the desired stress distribution structure.

[0085] In some embodiments of this application, the chemically strengthened glass crystal satisfies:

[0086] The value of n(SiO2) / n(Li2O) is 2.08, 2.09, or 2.12; and / or,

[0087] The values ​​of n(SiO2)+n(Li2O) are 90.19%, 90.4%, 90.62%, 90.82%, 91.24%, or 91.62%; wherein n(SiO2) is the molar percentage content of SiO2 at the center of the chemically strengthened glass-ceramic, and n(Li2O) is the molar percentage content of Li2O at the center of the chemically strengthened glass-ceramic.

[0088] 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:

[0089] SiO2: 60%–70%, Al2O3: 0%–6%, P2O5: 2%–8%, ZrO2: 8%–12%, Li2O: 10%–20%, SrO: 0%–6%, Na2O: 0%–3%. 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.

[0090] In some embodiments of this application, the composition at the center of the chemically strengthened glass crystal, based on the mass percentage of oxides, further comprises:

[0091] K2O: 0% to 2%, CaO: 0% to 2%, B2O3: 0% to 1%, Ta2O5: 0% to 2%, BaO: 0% to 6%.

[0092] 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:

[0093] The mass percentage of SiO2 is 62%–68%, preferably 63%–67%; and / or,

[0094] The mass percentage of Al2O3 is 1% to 6%, preferably 2% to 6%, more preferably 2% to 3%; and / or,

[0095] The mass percentage of P2O5 is 3% to 6%, preferably 3% to 5%, more preferably 4% to 5%; and / or,

[0096] The ZrO2 mass percentage is 8%–11%, preferably 9%–11%; and / or,

[0097] The mass percentage of Li2O is 11% to 18%, preferably 12% to 16%, more preferably 14% to 16%; and / or,

[0098] The mass percentage of SrO is 0% to 5%, preferably 0% to 4%; and / or,

[0099] The mass percentage of Na2O is 0% to 2.8%, preferably 0% to 1%; and / or,

[0100] The mass percentage of K2O is 0% to 1.5%, preferably 0% to 1.2%; and / or,

[0101] The mass percentage of CaO is 0% to 1%, preferably 0% to 0.95%; and / or,

[0102] The mass percentage of B2O3 is 0% to 0.8%, preferably 0% to 0.6%; and / or,

[0103] The mass percentage of Ta2O5 is 0% to 1.8%, preferably 0% to 1.5%; and / or,

[0104] The mass percentage of BaO is 0% to 5.5%, preferably 0% to 5%.

[0105] In some embodiments of this application, the crystallinity of the chemically strengthened glass-ceramic is not less than 60%, preferably, the crystallinity of the chemically strengthened glass-ceramic is 70% to 90%, more preferably, the crystallinity of the chemically strengthened glass-ceramic is 70% to 80%; and / or,

[0106] In the chemically strengthened glass-ceramic, the average grain size does not exceed 50 nm, preferably, the average grain size is 10 nm to 40 nm, more preferably, the average grain size is 15 nm to 30 nm; and / or,

[0107] In the chemically strengthened glass-ceramic, the lithium disilicate crystalline phase accounts for 80 wt% to 100 wt% of all crystalline phases; and / or,

[0108] 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.

[0109] In some embodiments of this application, when the thickness does not exceed 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,

[0110] 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 ≥90.2%. 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.

[0111] In some embodiments of this application, the Young's modulus of the chemically strengthened glass-ceramic is not less than 100 GPa, preferably not less than 110 GPa, more preferably 110 GPa to 130 GPa; and / or,

[0112] The density of the chemically strengthened microcrystalline glass is not less than 2.54 g / cm³. 3 Preferably, the density is 2.54 g / cm³. 3 ~2.64g / cm 3 ; and / or,

[0113] The refractive index of the chemically strengthened microcrystalline glass is ≤1.60, preferably 1.55 to 1.60; and / or,

[0114] The chemically strengthened microcrystalline glass has a Vickers hardness ≥ 700 kgf / mm². 2 Preferably, the Vickers hardness is 700 kgf / mm. 2 ~850kgf / mm 2 The fact that the Young's modulus, density, Vickers hardness, and refractive index are all within the above range indicates that chemically strengthened glass-ceramics have high intrinsic strength / natural strength, which in turn helps them achieve excellent mechanical strength and damage resistance.

[0115] In some embodiments of this application, the thickness t of the chemically strengthened glass-ceramic 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, the chemically strengthened glass-ceramic is 2D, 2.5D, 3D, or irregularly shaped; and / or, the chemically strengthened glass-ceramic is of uniform or unequal thickness. Those skilled in the art can choose according to their needs. "Unequal thickness" means that the glass-ceramic or chemically strengthened glass-ceramic contains at least two portions of different thicknesses.

[0116] In some embodiments of this application, the chemically strengthened microcrystalline glass is subjected to a sandpaper drop test. 80-grit sandpaper is used, and with a thickness not exceeding 0.70 mm, preferably 0.4 mm to 0.7 mm, and more preferably 0.45 mm to 0.55 mm, the average sandpaper drop resistance of the chemically strengthened microcrystalline glass is ≥1.60 m. Preferably, the average sandpaper drop resistance of the chemically strengthened microcrystalline glass is 1.65 m to 2.50 m. A higher measured average sandpaper drop resistance value indicates better drop damage resistance of the chemically strengthened microcrystalline glass.

[0117] In some embodiments of this application, the chemically strengthened glass-ceramic is compressed using a 10mm diameter round-headed metal bar, and the static compressive strength of a single bar that the chemically strengthened glass-ceramic can withstand is tested. The average value of the static compressive strength of a single bar that the chemically strengthened glass-ceramic can withstand is greater than 200N, preferably greater than 230N. The higher the measured static compressive strength of a single bar, the better the resistance to compression damage of the chemically strengthened glass-ceramic.

[0118] In a second aspect, a glass device is provided, comprising a chemically strengthened microcrystalline glass as described in any embodiment of the first aspect.

[0119] 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.

[0120] Fourthly, an electronic device is provided, comprising chemically strengthened microcrystalline glass as described in any embodiment of the first aspect.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] One or more of the technical solutions provided in this application have the following advantages compared with the prior art:

[0128] This application achieves both excellent damage resistance and high safety performance by enabling chemically strengthened glass-ceramics to meet specific crystal phase and stress distribution structures. The resulting glass exhibits superior drop resistance, and upon impact breakage, it produces relatively large fragments, preventing the formation of numerous easily scattered small fragments and thus avoiding safety hazards. It also meets emergency use requirements after breakage. For example, in this application, by ensuring a specific difference relationship between the tensile stress linear density value of the chemically strengthened glass-ceramic with lithium disilicate as the main crystal phase and the ratio of the stress integral of the tensile stress layer near the center to its thickness t, the glass-ceramic achieves a specific stress distribution structure. While ensuring a high overall stress level, this also guarantees a safer internal stress distribution, thereby helping to maintain a safe stress state for the glass-ceramic. Attached Figure Description

[0129] 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.

[0130] 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.

[0131] Figure 1 This is a DSC curve of the substrate glass of Embodiment 13 of this application;

[0132] Figure 2This is the XRD pattern of the glass-ceramic of Embodiment 13 of this application;

[0133] Figure 3 This is a comparison of the XRD curves of the microcrystalline glass and the chemically strengthened microcrystalline glass of Example 13 of this application;

[0134] Figure 4 This is a transmittance curve of the microcrystalline glass of Example 13 of this application;

[0135] Figure 5 This is a comparison of the transmittance curves of the microcrystalline glass and the chemically strengthened microcrystalline glass of Example 13 of this application;

[0136] Figure 6 The stress-thickness curve of the chemically strengthened microcrystalline glass of Example 13 of this application is shown.

[0137] Figure 7 The stress-thickness curves of the chemically strengthened microcrystalline glass of Examples 3, 4, 4 and 5 of this application are shown.

[0138] Figure 8 This is a vertical projection of the fragments of the chemically strengthened microcrystalline glass of Example 13 of this application after it breaks in a drop test, in a two-dimensional plane.

[0139] Figure 9 This is a vertical projection of the fragments of the chemically strengthened microcrystalline glass of Example 14 of this application after it breaks in a drop test, in a two-dimensional plane.

[0140] Figure 10 The image shows the vertical projection of the fragments of the chemically strengthened microcrystalline glass of Comparative Example 6 of this application after it breaks in a drop test, in a two-dimensional plane.

[0141] Figure 11 This is a vertical projection of the fragments of the chemically strengthened glass-ceramic of Comparative Example 12 of this application in a two-dimensional plane after it breaks in a drop test.

[0142] Figure 12 This is a schematic diagram of the front structure of the electronic device mentioned in the embodiments of this application;

[0143] Figure 13 This is a schematic diagram of the rear structure of the electronic device mentioned in the embodiments of this application;

[0144] Figure 14 This is a schematic diagram of the structure of the electronic device mentioned in the embodiments of this application. Figure 1 ;

[0145] Figure 15 This is a schematic diagram of the structure of the electronic device mentioned in the embodiments of this application. Figure 2 ;

[0146] Figure 16 This is a schematic diagram of the structure of the chemically strengthened microcrystalline glass of this application, where t is the thickness of the glass, d is the depth of the compressive stress layer, 21 is the compressive stress layer, and 22 is the tensile stress layer.

[0147] 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

[0148] 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.

[0149] 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.

[0150] Terminology and testing methods:

[0151] 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.

[0152] 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.

[0153] In this application, the substrate glass (or base glass) refers to glass that has not undergone nucleation, crystallization, or strengthening treatment.

[0154] 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.

[0155] 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.

[0156] In this application, the visible light wavelength range refers to 360nm to 740nm.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] 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:

[0164]

[0165] 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 are not involved in the calculation. In this application, the tensile stress linear density value is approximately the ratio of the definite integral of the tensile stress curve to the thickness of the chemically strengthened glass-ceramic.

[0166] 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.

[0167] 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).

[0168] In this application, |CT_CV| refers to the absolute value of the maximum tensile stress, in MPa, obtained by testing with an SLP-2000 stress meter.

[0169] 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.

[0170] 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.

[0171] 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 calculated using the aforementioned formula for calculating tensile stress linear density. Based on the stress data of the chemically strengthened glass-ceramics measured by the SLP-2000, the stress integral value of the tensile stress layer along the thickness direction of the chemically strengthened glass-ceramics, from a distance of 2 times DOL_0 from the main surface of the chemically strengthened glass-ceramics to half the thickness of the chemically strengthened glass-ceramics, is calculated.

[0172] 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.

[0173] In this application, M K2O M' represents the mass percentage of K2O on the surface of chemically strengthened glass-ceramics. K2O M represents the mass percentage of K₂O on the surface of a chemically strengthened glass-ceramic after each of the two main surfaces is thinned by 3 μm along the thickness direction. Na2O M' represents the mass percentage of Na2O on the surface of chemically strengthened glass-ceramics. Na2O The mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic after thinning the two main surfaces by 3 μm along the thickness direction is obtained.

[0174] M K2O The testing method involved measuring the potassium (K) content on the surface of the chemically strengthened glass-ceramic using X-ray fluorescence spectrometry (XRF). The mass percentage of K₂O on the surface was then calculated as follows: Mass percentage of K₂O on the surface = (K content on the surface × relative molecular mass of K₂O) / (relative atomic mass of K × 2). It should be understood that the surface K content = mass of K / total mass of elements, and the total mass of elements = total mass of oxides. The XRF instrument used was a Thermo Scientific ARLPERFORM'X, with a Rh target, a photodiode voltage of 40 kV, a current of 60 mA, a collimator of 0.15, a LiF₂O₀ crystal, an FPC detector, and a 29 mm diameter circle as the test area. The X_UQ method in the OXSAS analysis software was employed.

[0175] M Na2O The testing method involved measuring the Na content on the surface of the chemically strengthened glass-ceramic using X-ray fluorescence spectrometry (XRF), and then calculating the mass percentage of Na₂O on the surface. The calculation method was: Mass percentage of Na₂O on the surface = (Na content on the surface × relative molecular mass of Na₂O) / (relative atomic mass of Na × 2). It should be understood that the Na content on the surface = mass of Na / total mass of elements, and the total mass of elements = total mass of oxides. The XRF instrument used was a Thermo Scientific ARLPERFORM'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 used was the X_UQ method in the OXSAS analysis software.

[0176] In this application, the XRF instrument used standard-free testing and did not test the concentration of elements with atomic numbers 6 and below or their oxides in the chemically strengthened glass-ceramic. The mass percentage of K2O on the surface of the chemically strengthened glass-ceramic = mass of K2O / total mass of oxides; the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic = mass of Na2O / total mass of oxides. The oxides include SiO2, Al2O3, ZrO2, Na2O, K2O, P2O5, and other oxides that can be accurately measured by XRF, but do not include the content of oxides such as B2O3 and Li2O that cannot be accurately measured by XRF. K2O and M' Na2O For the testing method, please refer to M. K2O and M Na2O The testing method.

[0177] 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.

[0178] In this application, the dimensions of the microcrystalline glass sheet were tested using a two-dimensional measuring machine (instrument model: MiyuMY-YXCL-4030).

[0179] 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.

[0180] 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:

[0181] (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.

[0182] (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).

[0183] (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.

[0184] (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 used for curve fitting in Jade software. Jade outputs a fitting report. Based on the angle 2θ value and PeakFWHM value corresponding to each diffraction peak in the fitting report, the PeakFWHM 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.

[0185] In this application, referring to the national standard GB / T7962.12-2010 "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%.

[0186] 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.

[0187] Density test: In this application, the density of the microcrystalline glass was tested using an electronic density balance SD-200L from ALFAMIRAGE, Japan.

[0188] 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.

[0189] 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 LINSEISL75VD1000 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.

[0190] Vickers hardness testing: Chemically strengthened microcrystalline glass was prepared into small pieces with dimensions of 50mm × 50mm × (0.47~0.54)mm. Glass samples with clean surfaces and free from visible scratches, dents, cracks, or other damage were selected as test samples. The Vickers hardness was then measured using a Vickers hardness tester. The Vickers hardness tester used in this application was a digital display low-load Vickers hardness tester, model VTD405, manufactured by Beijing Kewei Technology Co., Ltd. Test conditions: load 300gf, loading time 10s, and the validity of the indentation conformed to the standard "GB / T37900-2019 Test Method for Hardness and Fracture Toughness of Ultra-thin Glass: Low-load Vickers Hardness Indentation Method". Measurements were taken at three different locations on the surface of the same test sample, and the average of the three measurements was taken as the Vickers hardness result of the test sample.

[0191] Single-bar static compressive strength test: Place the glass sample to be tested on the bottom ring of the tensile testing machine (LT-850A), start the testing software, and set the moving speed of the compression bar (bar diameter 10mm, ball head diameter 10mm) to 10mm / min. Click "Start Test." The compression bar will apply force to the center of the glass sample at the set moving speed until the glass sample cracks and breaks. The testing software will automatically read the force (N) at which the glass sample breaks and record it as the single-bar static compressive strength it can withstand, as the test result. Take 10 glass samples in the same condition for testing, and take the average of the test results as the single-bar static compressive strength of the glass sample to be tested.

[0192] 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.

[0193] Specifically, at least 10 samples were taken from each batch for testing, and the average sandpaper drop resistance was measured.

[0194] Where n is the number of glass samples tested in each batch, and hi is the drop height resistance of a single sample.

[0195] The test method for the drop height resistance of a single sample against sandpaper is as follows:

[0196] 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;

[0197] 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.

[0198] 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.

[0199] The method for testing the average size of the longest side of the glass fragments is as follows: First, test the average drop resistance on 80-grit sandpaper. After the glass breaks, take a picture of the breakage and import it into particle size analysis software (such as Nanomeasure) for analysis. During the analysis, select more than 80% of the glass fragments and mark them. The selected glass fragments should have a relatively large longest side in a two-dimensional vertical projection. The analysis software will automatically calculate and output the average size of the maximum dimensions of the selected glass fragments.

[0200] Without any theoretical constraints, for lithium disilicate glass-ceramics with high lithium content, increasing the overall stress level does not necessarily guarantee excellent damage resistance. If the strengthening process focuses only on increasing the overall stress level without considering the stress distribution, the resulting chemically strengthened glass-ceramics often suffers from unsuitable stress distribution, leading to a phenomenon of "reduced strengthening stability." Increasing the overall stress level can result in excessive internal tensile stress, especially in certain internal areas. Such a stress distribution structure not only fails to ensure excellent damage resistance but also poses safety hazards. It can cause the chemically strengthened glass-ceramics to easily explode and crack under slight impacts, with small fragments flying everywhere, and even spontaneously combusting. This severely affects the reliability of the chemically strengthened glass-ceramics products and poses a serious threat to the personal safety of users.

[0201] In view of this, for glass-ceramics with lithium disilicate as the main crystalline phase, this application makes the prepared chemically strengthened glass-ceramics meet specific stress characteristics, so that the chemically strengthened glass-ceramics have a specific stress distribution structure. While ensuring the improvement of the mechanical strength performance and damage resistance of the chemically strengthened glass-ceramics, the chemically strengthened glass-ceramics maintain a safe stress state and have high safety performance.

[0202] The chemically strengthened microcrystalline glass with specific stress characteristics provided in this application exhibits excellent resistance to drop damage. Furthermore, when this chemically strengthened microcrystalline glass breaks upon impact, the resulting fragments are relatively large, preventing the formation of numerous small fragments that easily scatter and thus avoiding safety hazards. When this chemically strengthened microcrystalline glass is used as the cover glass for a display screen, it can also meet emergency use requirements after a drop breakage.

[0203] As described above, in some embodiments of this application, a chemically strengthened glass crystal is provided, the chemically strengthened glass crystal containing a lithium disilicate crystalline phase, wherein the lithium disilicate crystalline phase has a higher mass percentage than other crystalline phases present in the chemically strengthened glass crystal;

[0204] The surface of the chemically strengthened microcrystalline glass has a compressive stress layer, and the interior has a tensile stress layer;

[0205] The chemically strengthened glass-ceramic satisfies the following relationship:

[0206] A≥49500, preferably A≥50000, more preferably A≥51000, and even more preferably A is 49500~65000;

[0207] Wherein, CT_LD is the tensile stress linear density, in MPa / mm, and CT_LD ≥ 60000 MPa / mm.

[0208] t represents the thickness of the chemically strengthened glass-ceramic, in mm.

[0209] The stress integral of the tensile stress layer along the thickness direction of the chemically strengthened glass-ceramic, from a distance of 2 times DOL_0 from the main surface of the chemically strengthened glass-ceramic to half the thickness of the chemically strengthened glass-ceramic, is expressed as the ratio to the thickness t, in MPa / mm, where x is the depth from the main surface of the chemically strengthened glass-ceramic.

[0210] In relation A, the data is substituted according to the above unit requirements to perform the calculation and obtain the result. The unit is not involved in the calculation. The value of A represents the tensile stress linear density (in this application, the tensile stress linear density value is basically the ratio of the definite integral of the tensile stress curve to the thickness of the chemically strengthened microcrystalline glass) minus the ratio of the stress integral of the tensile stress layer from a distance of 2 times DOL_0 from the main surface of the chemically strengthened microcrystalline glass to half the thickness of the chemically strengthened microcrystalline glass to the thickness t.

[0211] This application achieves a specific stress distribution structure in chemically strengthened glass-ceramics by ensuring that the tensile stress linear density value of the predominantly lithium disilicate phase and the ratio of the stress integral of the tensile stress layer near the center to its thickness t satisfy a specific difference relationship. This ensures a high overall stress level while guaranteeing a safer internal stress distribution, thus maintaining a safe stress state. The chemically strengthened glass-ceramics of this application not only achieves excellent damage resistance, such as excellent drop resistance, but also possesses high safety performance. When broken by impact, the resulting fragments are relatively large, preventing the formation of numerous small, easily scattered fragments and avoiding safety hazards. Furthermore, it meets emergency use requirements after breakage.

[0212] In some embodiments of this application, the chemically strengthened glass-ceramic satisfies: 60000.00 MPa / mm ≤ CT_LD, preferably 65000.00 MPa / mm ≤ CT_LD ≤ 90000.00 MPa / mm, more preferably 70000.00 MPa / mm ≤ CT_LD ≤ 90000.00 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 60000 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.

[0213] In some embodiments, the CT_LD of the chemically strengthened glass crystal can be 60000MPa / mm to 72000MPa / mm, 62000MPa / mm to 70000MPa / mm, 64000MPa / mm to 85000MPa / mm, or 75000MPa / mm to 80000MPa / mm. In some embodiments, the CT_LD of the chemically strengthened glass crystal can be 60000 MPa / mm, 65000 MPa / mm, 66000 MPa / mm, 67000 MPa / mm, 68000 MPa / mm, 69000 MPa / mm, 70000 MPa / mm, 72000 MPa / mm, 74000 MPa / mm, 76000 MPa / mm, 78000 MPa / mm, 80000 MPa / mm, 85000 MPa / mm, 90000 MPa / mm, 81333.56 MPa / mm, 77092.45 MPa / mm, or 82483. The values ​​can be 27 MPa / mm, 80204.48 MPa / mm, 78205.39 MPa / mm, 84212.52 MPa / mm, 81170.89 MPa / mm, 81403.23 MPa / mm, 79173.31 MPa / mm, 78723.70 MPa / mm, 79309.57 MPa / mm, 77483.48 MPa / mm, 77692.71 MPa / mm, or 72249.87 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.

[0214] In some implementations, the value of relation A can be: 49500, 50000, 50500, 51000, 51500, 52000, 52500, 53000, 53500, 54000, 54500, 55000, 55500, 56000, 56500, 57000, 57500, 58000, 58500, 59000, 59500, 60000, 65000, 54802.89, 5102 4.81, 57170.35, 52689.22, 52272.54, 58526.63, 54807.04, 56429.32, 52815.28, 53580.63, 54032.42, 54060.10, 53361.40, or 54841.31, 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.

[0215] In some embodiments of this application, the chemically strengthened glass crystal satisfies the following relationship:

[0216] B=[|CT_AV|×(t / 2-DOL_0)]×[5×M K2O / (5×M K2O +0.5×M Na2O B≥9000MPa·μm, preferably,

[0217] B ≥ 9100 MPa·μm, more preferably B ≥ 9200 MPa·μm, more preferably B has a value of 9000 MPa·μm~13000 MPa·μm;

[0218] Where |CT_AV| is the absolute value of the average tensile stress,

[0219] t represents the thickness of the chemically strengthened glass-ceramic.

[0220] M K2O This represents the mass percentage of K2O on the surface of chemically strengthened glass-ceramics.

[0221] M Na2O The percentage by mass of Na2O on the surface of chemically strengthened glass-ceramics.

[0222] This application achieves a better stress level in chemically strengthened glass-ceramics by satisfying a specific relationship between the stress characteristics and surface component content, thus ensuring that the glass-ceramics have good resistance to monobar static pressure and high hardness.

[0223] In some implementations, the value of relation B can be: 9000.00 MPa·μm, 9500.00 MPa·μm,

[0224] 10000.00MPa·μm, 10500.00MPa·μm, 11000.00MPa·μm, 11500.00MPa·μm,

[0225] 12000.00MPa·μm, 13000.00MPa·μm, 10333.74MPa·μm, 11642.77MPa·μm,

[0226] 11864.03MPa·μm, 10818.69MPa·μm, 10199.45MPa·μm, 10638.55MPa·μm,

[0227] The values ​​can be 10862.45 MPa·μm, 9442.20 MPa·μm, 9292.34 MPa·μm, 10157.90 MPa·μm, 10637.99 MPa·μm, 10907.18 MPa·μm, 10429.05 MPa·μm, or 11586.62 MPa·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 ranges, as long as the chemically strengthened glass-ceramic with the desired performance of this application can be obtained.

[0228] In some embodiments of this application, the chemically strengthened microcrystalline glass satisfies the following relationship: C = CS_50 / |CT_CV|, C ≥ 0.85, preferably 0.85–1.5, more preferably 0.9–1.3, and even more preferably 0.9–1.2; where CS_50 refers to the compressive stress value at a depth of 50 μm from the main surface of the chemically strengthened microcrystalline glass, in MPa, and |CT_CV| is the absolute value of the maximum tensile stress, in MPa. This application, by ensuring a specific relationship between the stress characteristics of the chemically strengthened microcrystalline glass, facilitates a better stress level, thereby ensuring that even after breakage, the fragments are relatively large, preventing the formation of numerous small fragments that easily scatter, thus avoiding safety hazards. When this chemically strengthened microcrystalline glass is used as the cover glass for a display screen, it can also meet emergency use requirements after a drop and breakage.

[0229] In some embodiments, the value of relation C can be: 0.85, 0.90, 0.95, 1.00, 1.05, 1.10, 1.15, 1.20, 1.25, 1.30, 0.93, 1.12, 1.00, 0.97, 1.03, 0.99, 1.01, 0.98, 0.92, or 1.06, 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 range, as long as the chemically strengthened glass-ceramic with the desired performance of this application can be obtained.

[0230] In this application, by making the chemically strengthened glass crystal meet suitable stress characteristics and / or surface composition characteristics, it is beneficial to obtain chemically strengthened glass crystal products with high stress levels, thereby making it easier to exert the effect of stress characteristics on improving mechanical strength properties, and enabling the chemically strengthened glass crystal to meet excellent damage resistance and high safety performance.

[0231] In some embodiments of this application, the chemically strengthened glass crystal satisfies: 140.00MPa≤CS_50, preferably, 180.00MPa≤CS_50, more preferably, 180MPa≤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 crystal.

[0232] In some embodiments, the CS_50 of the chemically strengthened glass crystal can be 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, 210.89 MPa, 216.96 MPa, or 216.18 MPa. The pressure values ​​can be 217.56 MPa, 216.54 MPa, 214.69 MPa, 217.72 MPa, 218.14 MPa, 216.14 MPa, 212.31 MPa, 213.77 MPa, 215.64 MPa, 201.79 MPa, or 213.58 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.

[0233] In some embodiments of this application, the chemically strengthened glass-ceramic satisfies: 90.00 μm ≤ DOL_0, preferably 100.00 μm ≤ DOL_0, more preferably 100.00 μm ≤ DOL_0 ≤ 160.00 μm, 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 drop damage resistance.

[0234] In some embodiments, the DOL_0 of the chemically strengthened glass-ceramic can be 90.00 μm, 100.00 μm, 105.00 μm, 110.00 μm, 115.00 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 110.04 μm, 107.70 μm, 109.97 μm, 109.32 μm, 109.13 μm, 109.87 μm, 109.42 μm, 110.63 μm, 109.11 μm, 108.94 μm, 111.27 μm, 106.65 μm, or 119.97 μm, 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 performance required by 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.

[0235] In some embodiments of this application, the chemically strengthened glass-ceramic satisfies: 0.18 ≤ DOL_0 / t, preferably 0.20 ≤ DOL_0 / t ≤ 0.25, more preferably 0.22 ≤ 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.

[0236] In some embodiments, the value of DOL_0 / t in the chemically strengthened glass-ceramic can be 0.20–0.23 or 0.21–0.22. In some embodiments, the value of DOL_0 / t in the chemically strengthened glass-ceramic can be 0.18, 0.19, 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.

[0237] The thickness t of the chemically strengthened glass-ceramic described in this application is not particularly limited. For example, in some embodiments of this application, 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, the thickness t is 0.4-0.7 mm; more preferably, the thickness t is 0.45 mm-0.55 mm. In some embodiments of this application, the thickness 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.

[0238] In some embodiments of this application, the chemically strengthened glass crystal satisfies: 150MPa≤|CT_CV|, preferably, 150MPa≤|CT_CV|≤250MPa, more preferably, 180MPa≤|CT_CV|≤250MPa, where |CT_CV| is the absolute value of the maximum tensile stress.

[0239] In some embodiments, the |CT_CV| of the chemically strengthened glass crystal can be 150.00MPa~250.00MPa, 150.00MPa~180.00MPa, 150.00MPa~240.00MPa, 190.00MPa~230.00MPa, or 200.00MPa~230.00MPa. In some embodiments, the |CT_CV| of the chemically strengthened glass crystal can be 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, 226.68 MPa, 193.35 MPa, or 215.52 MPa. The pressure values ​​can be 224.35 MPa, 209.26 MPa, 217.21 MPa, 216.52 MPa, 222.24 MPa, 234.28 MPa, 202.79 MPa, 201.74 MPa, 218.25 MPa, 219.42 MPa, or 207.75 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.

[0240] In some embodiments of this application, the chemically strengthened glass crystal satisfies: 100.00MPa≤|CT_AV|, preferably, 100.00MPa≤|CT_AV|≤160.00MPa, more preferably, 130.00MPa≤|CT_AV|≤160.00MPa, where |CT_AV| is the absolute value of the average tensile stress.

[0241] In some embodiments, the |CT_AV| of the chemically strengthened glass crystal can be 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 100.00MPa, 110.00MPa, 120.00MPa, 125.00MPa, 130.00MPa, 135.00MPa, 140.00MPa, 150.00MPa, 160.00MPa, 145.28MPa, 135.44MPa, 147.26MPa, or 142.53MPa. The pressure values ​​can be 138.79 MPa, 150.24 MPa, 144.35 MPa, 146.02 MPa, 142.02 MPa, 139.69 MPa, 140.56 MPa, 139.63 MPa, 142.25 MPa, or 138.91 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 ranges, as long as the chemically strengthened glass-ceramic with the desired performance of this application is obtained.

[0242] It should be understood that "surface composition" in this application can refer to the material composition or component distribution of the surface of the substrate glass, microcrystalline glass, or chemically strengthened microcrystalline glass. It can also refer to the mass percentage, molar percentage, mass percentage relationship between two or more material components, mass content relationship between two or more material components, molar content relationship between two or more material components, a combination of the foregoing, and others. For example, the mass percentage of Na₂O or K₂O on the surface of a chemically strengthened microcrystalline glass, or, for instance, the mass percentage of Na₂O and K₂O on the surface of a chemically strengthened microcrystalline glass.

[0243] In some embodiments of this application, the chemically strengthened glass crystal satisfies: M Na2O ≥5.0%, preferably 5.0% to 20%, more preferably 6% to 17%, wherein M Na2O M for chemically strengthened microcrystalline glass surface Na2O The percentage of mass.

[0244] In some embodiments, the mass percentage M of Na₂O on the surface of the chemically strengthened microcrystalline glass is... Na2O The percentage 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%, 16%, 17%, 18%, 19%, 20%, 12.87%, 7.93%, 10.85%, 12.63%, 13.02%, 13.63%, 15.25%, 16.16%, 12.75%, 12.18%, 11.95%, 11.26%, or 12.14%, or it can be a value within the range of any two of the above specific values ​​as endpoints, as long as it can produce the chemically strengthened microcrystalline glass with the performance required by this application. 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.

[0245] In some embodiments of this application, the chemically strengthened glass crystal satisfies: M K2O ≤3.0%, preferably 0.2% to 2%, more preferably 0.3% to 1.6%, wherein M K2O The percentage by mass of K2O on the surface of chemically strengthened glass-ceramics.

[0246] In some embodiments, the mass percentage M of K2O on the surface of the chemically strengthened microcrystalline glass is... K2O The percentage can be 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 1.33%, 1.21%, 1.47%, 1.48%, 1.42%, 1.57%, 1.32%, 1.43%, 1.36%, 1.41%, 1.54%, 1.5%, or 1.52%, or it can be 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.

[0247] In some embodiments of this application, after thinning the two main surfaces of the chemically strengthened glass-ceramic by 3 μm each, the resulting thinned chemically strengthened glass-ceramic satisfies the following: the mass percentage M' of K2O on the surface of the chemically strengthened glass-ceramic. K2O The mass percentage M' of Na2O on the surface of the chemical microcrystalline glass Na2O for:

[0248] M'K2O <3.0%, preferably 0.0% to 1%, more preferably 0.1% to 0.5%,

[0249] M' Na2O <15.0%, preferably 3.0% to 14%, more preferably 4% to 12%.

[0250] In some implementations, M' K2O The percentage can be 0.00%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 1%, 1.5%, 2%, 2.5%, 0.300%, 0.289%, 0.318%, 0.321%, 0.315%, 0.301%, 0.326%, 0.305%, 0.322%, 0.319%, or 0.325%, 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.

[0251] In some implementations, M' Na2O The percentage can be 3.00%, 4.00%, 5.00%, 6.00%, 7.00%, 8.00%, 9.00%, 10.00%, 11.00%, 12.00%, 13.00%, 14.00%, 8.40%, 5.03%, 6.78%, 8.31%, 8.86%, 8.81%, 9.02%, 9.55%, 9.71%, 8.36%, 8.07%, 8.01%, 7.83%, or 8.08%, 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 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.

[0252] 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 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., Li₂O) 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 the process more difficult. Therefore, compared to the mass percentage of Na2O and K2O on the surface of the chemically strengthened microcrystalline glass after thinning each of the two main surfaces by 3 μm along the thickness direction, the mass percentage of Na2O and K2O on the surface of the unthinned chemically strengthened microcrystalline glass is higher. It should be understood that the chemically strengthened microcrystalline glass of this application is made by chemically strengthening microcrystalline glass, and the composition at the center of the chemically strengthened microcrystalline glass is the same as or substantially the same as the composition of the microcrystalline glass. Compared to the microcrystalline glass before chemical strengthening treatment, the composition at the surface of the microcrystalline glass product after chemical strengthening treatment may be different from that before chemical strengthening treatment. This is because ion exchange occurs during the chemical strengthening process. During ion exchange, in the newly formed microcrystalline glass, a certain type of alkali metal ion (e.g., Li) at the surface of the microcrystalline glass... + 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.

[0253] In this application, the glass-ceramic used to prepare chemically strengthened glass-ceramics 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 glass-ceramic in terms of the molar percentage or mass percentage of oxides.

[0254] 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%–2.5%, ZrO2: 3.5%–5.5%, Li2O: 22%–32%, SrO: 0%–2.5%, and Na2O: 0%–3%. 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 meets a specific crystal phase structure, as well as for obtaining chemically strengthened microcrystalline glass that meets a specific stress structure.

[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, further includes: K2O: 0%–1%, CaO: 0%–1.5%, B2O3: 0%–1%, Ta2O5: 0%–1%, and BaO: 0%–2.5%.

[0256] It should be understood 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 above measurement method based on the molar percentage of oxides can be transformed into the mass percentage of oxides.

[0257] In some embodiments of this application, the composition of the substrate glass, the composition of the microcrystalline glass, or the composition of the core of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, includes: SiO2: 60%–70%, Al2O3: 0%–6%, P2O5: 2%–8%, ZrO2: 8%–12%, Li2O: 10%–20%, SrO: 0%–6%, Na2O: 0%–3%. In some embodiments of this application, the composition of the substrate glass, the composition of the microcrystalline glass, or the composition of the core of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, further includes: K2O: 0%–2%, CaO: 0%–2%, B2O3: 0%–1%, Ta2O5: 0%–2%, BaO: 0%–6%.

[0258] 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 60% and 70%.

[0259] In some embodiments, the molar 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 molar percentage of oxides, can be 58%–66%, 60%–65%, 60.5%–64.5%, or 60.5%–63%. In some embodiments, the molar 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 molar percentage of oxides, can be 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 60.94%, 61.15%, 61.22%, 61.43%, 61.72%, or 62.22%, 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 can be obtained.

[0260] In some embodiments, the mass percentage 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, based on the mass percentage of oxides, can be 60%–70%, 62%–68%, 63%–67%, or 63%–66.5%. 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 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 65.92%, 66.06%, 63.98%, 63.44%, 63.31%, 64.45%, 65.72%, 65.54%, or 63.87%, 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.

[0261] 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%.

[0262] In some embodiments, the molar percentage of Al2O3 in the composition of the substrate glass, the microcrystalline glass, or the central part of the chemically strengthened microcrystalline glass, based on the molar percentage of oxides, can be 0%–3.5%, 1%–3.5%, 1%–2.5%, 0%–2.5%, 0.1%–2%, or 1%–2%. 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%, 0.6%, 0.8%, 1%, 1.2%, 1.5%, 1.6%, 1.8%, 2%, 2.2%, 2.4%, 2.5%, 3%, 3.5%, 1.22%, 1.37%, 1.38%, or 1.4%, 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.

[0263] In some embodiments, the mass percentage of Al2O3 in the composition of the substrate glass, the microcrystalline glass, or the central part of the chemically strengthened microcrystalline glass, based on the mass percentage of oxides, can be 0%–6%, 1%–6%, 2%–6%, 0%–5%, 0.1%–4%, 2%–3%, or 1.5%–3.5%. 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%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 2.52%, 2.51%, 2.43%, 2.41%, 2.15%, 2.48%, 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.

[0264] 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 2.5%, or the mass percentage content of P2O5 is 2% to 8%.

[0265] 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% to 2.5%, 1% to 2%, 1.2% to 2%, or 1.5% to 2%. In some embodiments, the molar percentage of P2O5 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 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%, 1.82%, 1.83%, 1.84%, 1.85%, or 1.86%, 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 some embodiments, the mass percentage of P2O5 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 2%–8%, 3%–6%, 3%–5%, or 4%–4.8%. In some embodiments, the mass percentage of P2O5 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 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 4.66%, 4.68%, 4.54%, 4.49%, 4.55%, 4.56%, 4.65%, 4.64%, or 4.52%, 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 can be obtained.

[0267] 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. Furthermore, due to the high charge and strong field of the ZrO2 cations, it has a significant accumulation effect on the glass structure and is commonly used as a nucleating agent in glass-ceramics. In this invention, a higher ZrO2 content results in higher stress in the system and a more ideal stress effect; however, excessive ZrO2 can degrade the optical properties of the glass-ceramics. 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-ceramics, or the composition at the center of the chemically strengthened glass-ceramics is 3.5% to 5.5%, or the mass percentage content of ZrO2 is 8% to 12%.

[0268] In some embodiments, the molar percentage of ZrO2 in the composition of the substrate glass, the microcrystalline glass, or the core composition of the chemically strengthened microcrystalline glass, based on the molar percentage of oxides, can be 3.5%–5.5%, 4%–5%, 4.2%–5%, or 4%–4.8%. In some embodiments, the molar percentage of ZrO2 in the composition of the substrate glass, the microcrystalline glass, or the core composition of the chemically strengthened microcrystalline glass, based on the molar percentage of oxides, can be 3.5%, 4%, 4.5%, 5%, 5.5%, 4.47%, 4.57%, 4.59%, 4.6%, 4.61%, or 4.66%, 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.

[0269] 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 8%–12%, 8%–11%, 9%–11%, or 9.2%–10.5%. 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 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 10.12%, 9.84%, 9.72%, 9.52%, 9.98%, 9.88%, 10.07%, 10.04%, or 9.79%, 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 can be obtained.

[0270] 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 22%–32%, or the mass percentage content of Li₂O is 10%–20%.

[0271] In some embodiments, the molar percentage of Li2O 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 22%–32%, 23%–31%, 24%–30%, 25%–31%, 27%–30.5%, or 28.5%–29.8%. In some embodiments, the molar percentage of Li2O in the composition of the substrate glass, the microcrystalline glass, or the core of the chemically strengthened microcrystalline glass, based on the molar percentage of oxides, can be 22%, 22.5%, 23%, 23.5%, 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%, 29.25%, 29.38%, 29.39%, 29.4%, or 29.52%, 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 some embodiments, the mass percentage of Li₂O 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 10%–20%, 11%–18%, 12%–16%, 15%–16%, 14%–17%, or 13%–16.5%. In some embodiments, the mass percentage of Li₂O 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 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, or 18%. The values ​​can be 18.5%, 19%, 19.5%, 20%, 15.49%, 15.71%, 15.28%, 15.09%, 15.11%, 15.47%, 15.33%, 15.63%, 15.59%, or 15.19%, 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.

[0273] 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 2.5%, or the mass percentage content of SrO is 0% to 6%.

[0274] In some embodiments, the molar percentage of SrO in the composition of the substrate glass, the microcrystalline glass, or the core composition of the chemically strengthened microcrystalline glass, based on the molar percentage of oxide, can be 0%–2.5%, 0%–2%, or 0%–1.9%. In some embodiments, the molar percentage of SrO in the composition of the substrate glass, the microcrystalline glass, or the core composition 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%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 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 can be obtained.

[0275] In some embodiments, the mass percentage of SrO 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%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 2.52%, 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.

[0276] In this application, Na₂O is an optional component, serving as an exooxide in the network. A suitable amount of Na₂O can provide free oxygen, improve the viscosity of the glass, promote the melting and clarification of the molten glass, and 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 3%, or the mass percentage content of Na₂O is 0% to 3%.

[0277] In some embodiments, the molar percentage of Na2O in the composition of the substrate glass, the microcrystalline glass, or the central part of the chemically strengthened microcrystalline glass, as measured by the molar percentage of oxides, can be 0% to 3%, 0% to 2.6%, or 0% to 1%. 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, 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%, 2%, 2.5%, 2.6%, 3%, or 0.46%, 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.

[0278] In some embodiments, the mass percentage of Na₂O 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%, 0.5%, 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%, 2.6%, 3%, or 0.51%, 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.

[0279] 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 1%, or the mass percentage content of K2O is 0% to 2%.

[0280] 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%, 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.

[0281] 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%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, or 0.77%, 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.

[0282] 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 1.5%, or the mass percentage content of CaO is 0% to 2%.

[0283] 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%, 0.95%, or 0.92%, 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 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%, 0.95%, or 0.92%, 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.

[0285] 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%.

[0286] 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.

[0287] In some embodiments, the mass 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 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 0.56%, 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.

[0288] In this application, the selective addition of appropriate amounts of Ta2O5 helps to increase the density of the glass-ceramic and its Young's modulus, but it may also increase the refractive index of the glass-ceramic, thus 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 Ta2O5 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 Ta2O5 is 0% to 2%.

[0289] 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.

[0290] 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 oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.2%, 1.5%, 1.8%, 2%, 1.3%, or 1%, 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.

[0291] 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 2.5%, or the mass percentage content of BaO is 0% to 6%.

[0292] 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%, 1.9%, 2%, 2.5%, 1.37%, 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.

[0293] In some embodiments, the mass percentage of BaO 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%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 3.65%, 3.68%, or 4.85%, 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.

[0294] In some embodiments of this application, the chemically strengthened glass-ceramic satisfies: 2.00 ≤ n(SiO2) / n(Li2O) ≤ 2.40, preferably 2.00 ≤ n(SiO2) / n(Li2O) ≤ 2.30, and more preferably 2.02 ≤ n(SiO2) / n(Li2O) ≤ 2.20, where n(SiO2) is the molar percentage content of SiO2 at the center of the chemically strengthened glass-ceramic, and n(Li2O) is the molar percentage content of Li2O at the center of the chemically strengthened glass-ceramic. It should be noted that the content relationships of each oxide in this application are expressed as molar percentages of the oxides, and the molar unit is not involved in the calculation. By adjusting the content of each oxide to satisfy a specific content relationship, it is beneficial to obtain glass-ceramic or chemically strengthened glass-ceramic that meets the desired mechanical strength properties.

[0295] In some embodiments, the value of n(SiO2) / n(Li2O) can be 2, 2.1, 2.2, 2.3, 2.4, 2.08, 2.09, or 2.12, 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.

[0296] In some embodiments of this application, the chemically strengthened glass-ceramic satisfies: 90% ≤ n(SiO2) + n(Li2O) ≤ 95%, preferably 90% ≤ n(SiO2) + n(Li2O) ≤ 92%, where n(SiO2) is the molar percentage content of SiO2 at the center of the chemically strengthened glass-ceramic, and n(Li2O) is the molar percentage content of Li2O at the center of the chemically strengthened glass-ceramic. It should be noted that the content relationships of each oxide in this application are expressed as molar percentages of the oxides, and the molar unit is not involved in the calculation. By adjusting the content of each oxide to satisfy a specific content relationship, it is beneficial to obtain glass-ceramic or chemically strengthened glass-ceramic that meets the desired mechanical strength properties.

[0297] In some embodiments, the value of n(SiO2)+n(Li2O) can be 90%, 91%, 92%, 93%, 94%, 95%, 90.19%, 90.4%, 90.62%, 90.82%, 91.24%, or 91.62%, 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.

[0298] In this application, by adjusting and controlling the content relationship between SiO2 and Li2O, it is beneficial to ensure that a microcrystalline glass with lithium disilicate as the main crystal phase structure is obtained that meets the desired performance, and at the same time, it is beneficial to achieve the desired stress distribution structure.

[0299] In this application, phrases such as "lithium disilicate crystalline phase has a higher mass percentage than other crystalline phases present in chemically strengthened glass-ceramics" or "lithium disilicate is the main crystalline phase," or other similar expressions, refer to the fact that the mass percentage (mass % or wt%) of the lithium disilicate crystalline phase in the glass-ceramics used to prepare chemically strengthened glass-ceramics, or in all crystalline phases of chemically strengthened glass-ceramics, according to embodiments of this application, is greater than 80% (mass %). In some embodiments of this application, the mass percentage of the lithium disilicate crystalline phase in the glass-ceramics used to prepare chemically strengthened glass-ceramics, or in 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-ceramics 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.

[0300] In this application, the crystallinity of the glass-ceramic used to prepare chemically strengthened glass-ceramics does not change significantly after chemical strengthening treatment. The crystallinity of the glass-ceramic is similar to or basically the same as that of the chemically strengthened glass-ceramics.

[0301] In some embodiments of this application, the crystallinity of the glass-ceramic used to prepare the chemically strengthened glass-ceramic is not less than 60%, preferably 70% to 90%, and more preferably 70% to 80%. 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.

[0302] In some embodiments, the crystallinity of the glass-ceramic used to prepare the chemically strengthened glass-ceramic can be 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 76.7%, 76.6%, 70.89%, 70.69%, 73.77%, 70.4%, 75.45%, 75.61%, 71.32%, or 72.29%, or it 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 properties 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.

[0303] 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 50 nm, preferably 10 nm to 40 nm, and more preferably 15 nm to 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.

[0304] In some embodiments, the average grain size of the glass-ceramic used to prepare the chemically strengthened glass-ceramic can be 50 nm, 40 nm, 35 nm, 30 nm, 25 nm, 20 nm, 15 nm, 10 nm, 22.8 nm, 23.0 nm, 26.4 nm, 23.3 nm, 25.6 nm, 24.3 nm, 24.1 nm, or 26.0 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 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 glass-ceramic or chemically strengthened glass-ceramic with the desired performance of this application can be obtained.

[0305] 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.

[0306] In some embodiments of this application, when the thickness does not exceed 0.70 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.

[0307] 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, 0.9, 0.8, 0.70, 0.65, 0.60, 0.55, 0.50, 0.45, 0.40, 0.35, 0.30, 0.25, 0.20, 0.56, 0.54, 0.52, 0.44, 0.42, 0.47, or 0.41, 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 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 desired performance of this application can be obtained.

[0308] In some embodiments of this application, the glass crystal used to prepare the chemically strengthened glass crystal is transparent in the visible light wavelength range. Preferably, for 550nm wavelength light, the transmittance of the chemically strengthened glass crystal is ≥85%, more preferably ≥90%, and even more preferably ≥90.2%. Chemically strengthened glass crystals that meet these transmittance requirements ensure good light transmission and transparency, making them 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.

[0309] 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%, 90.2%, 91%, 92%, 90.4%, 90.46%, 90.32%, 90.22%, 90.27%, 90.51%, 90.35%, 90.71%, 90.63%, 90.52%, 90.46%, or 90.32%, 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.

[0310] In some embodiments of this application, the Young's modulus of the glass-ceramic used to prepare the chemically strengthened glass-ceramic is not less than 100 GPa, preferably not less than 110 GPa, more preferably 110 GPa to 130 GPa, and even more preferably 114 GPa to 125 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 has high mechanical strength and high damage resistance.

[0311] 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, or 125 GPa. The values ​​can be 128 GPa, 130 GPa, 117.07 GPa, 114.27 GPa, 120.20 GPa, 122.40 GPa, 120.00 GPa, 116.22 GPa, 118.95 GPa, 114.61 GPa, 114.88 GPa, 118.63 GPa, 114.27 GPa, or 120.20 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.

[0312] In some embodiments of this application, the Vickers hardness of the chemically strengthened glass crystal is ≥700 kgf / mm². 2 Preferably, the Vickers hardness is 700 kgf / mm. 2 ~850kgf / mm 2 The high Vickers hardness helps ensure that chemically strengthened glass-ceramics have high mechanical strength and high resistance to damage.

[0313] In some embodiments, the Vickers hardness of chemically strengthened glass crystals can be 700 kgf / mm². 2 710kgf / mm2 720kgf / mm 2 730kgf / mm 2 740kgf / mm 2 750kgf / mm 2 760kgf / mm 2 770kgf / mm 2 780kgf / mm 2 790kgf / mm 2 800kgf / mm 2 810kgf / mm 2 820kgf / mm 2 830kgf / mm 2 840kgf / mm 2 Or 850 kgf / mm 2 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 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.

[0314] In some embodiments of this application, the density of the glass-ceramic used to prepare the chemically strengthened glass-ceramic is not less than 2.54 g / cm³. 3 Preferably, the density is 2.54 g / cm³. 3 ~2.64g / cm 3 In some embodiments, the density of the glass-ceramic used to prepare the chemically strengthened glass-ceramic can be 2.54 g / cm³. 3 2.55g / cm 3 2.56 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 Or 2.64 g / cm 3Alternatively, 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.

[0315] 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 1.55 to 1.60. In some embodiments, the refractive index of the glass-ceramic used to prepare the chemically strengthened glass-ceramic can be 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.

[0316] 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.

[0317] In some embodiments of this application, a sandpaper drop test is conducted on the chemically strengthened microcrystalline glass. The sandpaper used is 80-grit sandpaper. When the thickness does not exceed 0.70 mm, preferably 0.4 mm to 0.7 mm, and more preferably 0.45 mm to 0.55 mm, the average sandpaper drop resistance height of the chemically strengthened microcrystalline glass is ≥1.60 m. More preferably, the average sandpaper drop resistance height of the chemically strengthened microcrystalline glass is 1.65 m to 2.50 m. The higher the measured average sandpaper drop resistance height, the better the drop damage resistance performance of the chemically strengthened microcrystalline glass.

[0318] In some embodiments, when chemically strengthened glass-ceramics undergo drop tests on 80-grit sandpaper, the average drop resistance can be 1.60m, 1.65m, 1.7m, 1.75m, 1.8m, 1.85m, 1.9m, 1.95m, 2m, 2.1m, 2.2m, 2.3m, 2.4m, 2.5m, 1.79m, 1.67m, 1.82m, 1.76m, or 1.72m, or values ​​within a range defined by any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramics exhibiting the performance required by this application are 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-ceramics exhibiting the performance required by this application are obtained.

[0319] In some embodiments of this application, the chemically strengthened glass-ceramic is compressed using a 10mm diameter round-headed metal bar, and the static compressive strength of a single bar that the chemically strengthened glass-ceramic can withstand is tested. The average value of the static compressive strength of a single bar that the chemically strengthened glass-ceramic can withstand is greater than 200N, preferably greater than 230N. The higher the measured static compressive strength of a single bar, the better the resistance to compression damage of the chemically strengthened glass-ceramic.

[0320] 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.

[0321] 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.

[0322] 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.

[0323] 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.

[0324] 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.

[0325] 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.

[0326] 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.

[0327] 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.

[0328] 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.

[0329] In some embodiments of this application, a step of polishing and thinning the prepared chemically strengthened microcrystalline glass is also included.

[0330] 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.

[0331] 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 60wt%~95wt%, and the concentration of sodium salt is preferably 5wt%~40wt%. 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.

[0332] 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.

[0333] 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.

[0334] 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.

[0335] 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 12 , Figure 13 , Figure 14 and Figure 15 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.

[0336] In some embodiments of this application, such as Figure 13 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.

[0337] In some embodiments of this application, such as Figure 14 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.

[0338] 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.

[0339] 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.

[0340] 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.

[0341] Example 1

[0342] I. Preparation of Substrate Glass

[0343] 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.

[0344] 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.

[0345] II. Preparation of Microcrystalline Glass

[0346] 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.

[0347] 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 (710°C) at a heating rate of 10°C / min, and the holding time is 60 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 spent holding the crystallization furnace at the set heating rate after it has been heated to the set nucleation temperature. The crystallization holding time, or crystallization time, refers to the time spent holding the crystallization furnace at the set heating rate after it has been heated to the set crystallization temperature.

[0348] 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.

[0349] In the specific embodiments and comparative examples of this application, the microcrystalline glass sample brick was subjected to the aforementioned cold working treatment to produce microcrystalline glass polishing sheet samples with dimensions of 50mm × 50mm and thicknesses of 0.47mm to 0.54mm. The thickness of the microcrystalline glass polishing sheet sample obtained in Example 1 was 0.50mm.

[0350] The following tests were conducted on the microcrystalline glass sample obtained in Example 1:

[0351] 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 2.

[0352] III. Preparation of Chemically Strengthened Microcrystalline Glass

[0353] The microcrystalline glass polished sheet obtained above was subjected to one-step chemical strengthening treatment in a mixed salt at 470°C for 450 min. The composition of the mixed salt was: 19.99 wt% NaNO3 + 79.98 wt% KNO3 + 0.03 wt% LiNO3.

[0354] After chemical strengthening treatment, the glass-ceramic sample is taken out and placed on the furnace body of the strengthening furnace to be slowly cooled to room temperature. The salt coating on the surface of the glass-ceramic is washed off with water. After drying the glass-ceramic sample, the chemically strengthened glass-ceramic can be obtained.

[0355] The following tests were conducted on the chemically strengthened glass-ceramic obtained in Example 1:

[0356] I. Stress Test: The chemically strengthened glass-ceramic was tested using an SLP-2000 stress meter (the light source wavelength was 518nm, SOC = 25.5 (nm / cm) / MPa, the refractive index was set according to the refractive index value of the sample, and the exposure time was 300μsec). The stress linear density CT_LD value and the values ​​of Equation A (CT_LD value minus the stress integral of the tensile stress layer from a distance of 2 times DOL_0 from the main surface of the chemically strengthened glass-ceramic to half the thickness of the chemically strengthened glass-ceramic to the thickness t) and Equation C (CS_50 / |CT_CV|) were calculated. The results are shown in Table 3.

[0357] II. The mass content of Na2O and K2O on the surface of the chemically strengthened glass-ceramic was tested, and the results are shown in Table 4. At the same time, the two main surfaces of the prepared chemically strengthened glass-ceramic were polished and thinned along the thickness direction using a polishing machine. After each main surface was thinned by 3μm, the thinned chemically strengthened glass-ceramic was obtained. The mass percentage of K2O and Na2O on the surface of the thinned chemically strengthened glass-ceramic was tested using XRF, and the results are shown in Table 4. The value of relation B was then calculated, and the results are shown in Table 4.

[0358] III. The average drop height of chemically strengthened microcrystalline glass against sandpaper, single bar static compressive strength, Vickers hardness, and the average length of the longest side of 80% of the fragments after the drop test under two-dimensional vertical projection were tested. The results are shown in Table 4.

[0359] Examples 2-14

[0360] Each of these experiments was conducted with reference to Example 1, except that the glass composition, glass thickness, different process parameters, and corresponding test results for each example are shown in Tables 1-4.

[0361] The DSC curve of the substrate glass in Example 13 is as follows: Figure 1 As shown, by Figure 1 It can be seen that the substrate glass in this embodiment has endothermic and exothermic peaks, from which appropriate nucleation and crystallization temperatures can be selected.

[0362] The XRD pattern of the glass-ceramic in Example 13 is as follows: Figure 2 As shown, the XRD patterns of the microcrystalline glass in Example 13 before and after chemical strengthening are compared as follows. Figure 3 As shown. By Figure 2 and Figure 3 It is known that in this application, the main crystalline phase of both the glass-ceramic used to prepare chemically strengthened glass-ceramics and the chemically strengthened glass-ceramics is lithium disilicate, and the crystalline phase structure of the glass-ceramics does not change significantly before and after the chemical strengthening treatment.

[0363] The transmittance curve of the microcrystalline glass in Example 13 is as follows: Figure 4 As shown in the figure, the transmittance curves of the microcrystalline glass in Example 13 before and after chemical strengthening are compared as follows. Figure 5 As shown. By Figure 4 and Figure 5 It is understood that, in this application, both the glass crystal used to prepare the chemically strengthened glass crystal are transparent in the visible light range and have high transmittance, and the transmittance of the glass crystal does not change significantly before and after the chemical strengthening treatment.

[0364] The stress-thickness curve of the chemically strengthened microcrystalline glass in Example 13 is shown below. Figure 6 As shown, by Figure 6 It can be seen that the chemically strengthened microcrystalline glass has a better stress distribution.

[0365] The stress-thickness curves of the chemically strengthened microcrystalline glass in Examples 2, 3, 4, and 5 are shown below. Figure 7 As shown, by Figure 7 Therefore, the chemically strengthened microcrystalline glass needs to meet specific stress distribution requirements in order to achieve both good drop performance and good fragmentation after breakage, thereby ensuring good safety performance.

[0366] The chemically strengthened microcrystalline glass of Examples 13 and 14, after breaking in a drop test, has fragments whose vertical projections on a two-dimensional plane are as follows: Figure 8 and Figure 9 As shown in the figure, after the chemically strengthened microcrystalline glass breaks due to drop impact, the resulting fragments are relatively large and do not form a large number of small fragments that are easy to scatter, thus avoiding safety hazards.

[0367] Comparative Examples 1-12

[0368] The tests were conducted according to Example 1, with the differences being that the glass composition, thickness, different process parameters, and corresponding test results of each comparative example are shown in Tables 1-4. Among them, the chemically strengthened microcrystalline glass of Comparative Examples 6 and 12, after breaking in the drop test, showed the vertical projection of the fragments on the two-dimensional plane as shown in Tables 1-4. Figure 10 and Figure 11 As shown in the figure, the chemically strengthened microcrystalline glass produces relatively small fragments after being broken by a drop impact.

[0369] 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 2, the test results show that the expansion softening point of the microcrystalline glass of this application is between 750℃ and 820℃, indicating that the microcrystalline glass of this application is conducive to 3D hot bending to prepare 3D curved surface microcrystalline glass.

[0370]

[0371]

[0372]

[0373]

[0374]

[0375]

[0376]

[0377]

[0378]

[0379]

[0380] As can be seen from the embodiments and comparative examples described in Tables 1-4 above, compared with the comparative examples, the embodiments of this application, by ensuring that the tensile stress linear density value of the chemically strengthened glass-ceramic with lithium disilicate as the main crystalline phase satisfies a specific difference relationship with the ratio of the stress integral of the tensile stress layer near the middle position to the thickness t, can guarantee a safer internal stress distribution of the chemically strengthened glass-ceramic while ensuring a high overall stress level. This helps maintain a safe stress state for the chemically strengthened glass-ceramic. When the chemically strengthened glass-ceramic breaks due to a drop impact, the resulting fragments are relatively large, avoiding the formation of a large number of small fragments that are easily scattered, thus preventing safety hazards.

[0381] In Comparative Examples 1-12, the stress characteristics of the chemically strengthened microcrystalline glass do not meet the specific requirements of this application. For example, they do not meet the requirement that the tensile stress linear density value and the ratio of the stress integral of the tensile stress layer near the middle position to the thickness t satisfy a specific difference relationship. Ultimately, the chemically strengthened microcrystalline glass prepared in each comparative example either has poor resistance to sandpaper drop height, failing to achieve excellent drop damage resistance, or has low single-bar static compressive strength, failing to achieve excellent extrusion damage resistance, or has low Vickers hardness, or produces small fragments after drop impact breakage, failing to achieve high safety performance.

[0382] For example, in Comparative Examples 4-6, 8-9, and 12, although a high compressive stress layer depth and a high tensile stress linear density were obtained after chemical strengthening treatment, the stress distribution of the tensile stress layer was relatively unreasonable. The ratio of the tensile stress linear density value to the stress integral of the tensile stress layer near the center and its thickness t could not reach a specific difference relationship. Ultimately, the drop damage resistance and fragmentation performance of the chemically strengthened microcrystalline glass prepared in these comparative examples were inferior to those of the chemically strengthened microcrystalline glass of the present application embodiment. Similarly, in Comparative Examples 1-3, 10-11, and 7, the stress distribution of the tensile stress layer was also relatively unreasonable, and the ratio of the tensile stress linear density value to the stress integral of the tensile stress layer near the center and its thickness t could not reach a specific difference relationship. Although the fragments were larger after breakage, the overall drop damage resistance was inferior to that of the chemically strengthened microcrystalline glass of the present application embodiment. For example, in Comparative Examples 1 to 3, 6, 8 to 9, and 12, the stress characteristics and surface component content of the chemically strengthened glass-ceramics prepared do not meet the specific relationship requirements. As a result, the single-bar static compressive strength that the chemically strengthened glass-ceramics prepared in these comparative examples can withstand is lower than that of the chemically strengthened glass-ceramics in the embodiments of this application.

[0383] For example, in Examples 3, 12-14, Comparative Examples 4, and Comparative Examples 10-12, microcrystalline glass with the same glass composition and crystal structure was used to prepare chemically strengthened microcrystalline glass. However, because the tensile stress linear density value of the prepared chemically strengthened microcrystalline glass was different from the ratio of the stress integral to the thickness t of the tensile stress layer near the middle position, it was ultimately found that the chemically strengthened microcrystalline glass prepared in Examples 3 and 12-14, which meet the requirements of the technical solution scope of this application, not only had excellent resistance to sandpaper drop height greater than 1.6m and drop damage performance, but also produced relatively large fragments after drop impact breakage, with the average size of the longest side of the fragment particles under two-dimensional vertical projection being greater than or equal to 10mm. The chemically strengthened glass-ceramics prepared in Comparative Examples 4 and 12, which do not meet the requirements of the scope of this application, not only have a sandpaper drop resistance height of less than 1.6m, but also produce relatively small fragments after drop impact breakage, with the average size of the longest side of the fragment particles not exceeding 5mm under two-dimensional vertical projection. Meanwhile, the chemically strengthened glass-ceramics prepared in Comparative Examples 10 and 11, which also do not meet the requirements of the scope of this application, produce larger fragments after drop impact breakage, with the average size of the longest side of the fragment particles greater than or equal to 10mm under two-dimensional vertical projection, but their sandpaper drop resistance height does not exceed 1.4m, and their drop damage resistance is significantly inferior to the embodiments of this application. This indicates that, for glass-ceramics with lithium disilicate as the main crystalline phase, by making the prepared chemically strengthened glass-ceramics meet specific stress characteristics, thereby giving the chemically strengthened glass-ceramics a specific stress distribution structure, it is possible not only to improve the mechanical strength properties and damage resistance of the chemically strengthened glass-ceramics, but also to maintain the chemically strengthened glass-ceramics in a safe stress state, thus exhibiting higher safety performance.

[0384] 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 chemically strengthened glass-ceramic contains a lithium disilicate crystalline phase, wherein the lithium disilicate crystalline phase has a higher mass percentage than other crystalline phases present in the chemically strengthened glass-ceramic. The surface of the chemically strengthened microcrystalline glass has a compressive stress layer, and the interior has a tensile stress layer; The tensile stress layer of the chemically strengthened glass-ceramic, based on the molar percentage of oxides, comprises: SiO2: 60%~66%, Al2O3: 0%~2.5%, P2O5: 1%~2.5%, ZrO2: 3.5%~5.5%, Li2O: 27%~32%, SrO: 0% ~2.5%, Na2O: 0%~3%, K2O: 0%~1%, CaO: 0%~1.5%, B2O3: 0%~1%, Ta2O5: 0%~1%, BaO: 0%~2.5%; The chemically strengthened glass-ceramic satisfies the following relationship: A= ,A≥49500; Wherein, CT_LD is the tensile stress linear density, in MPa / mm. DOL_0 is the distance from any primary surface of the chemically strengthened glass-ceramic to the position near which the compressive stress is zero, in μm; |CT_AV| is the absolute value of the average tensile stress of the chemically strengthened glass-ceramic, in MPa; CT_LD ≥ 60000 MPa / mm. t represents the thickness of the chemically strengthened glass-ceramic, in mm. The stress integral of the tensile stress layer along the thickness direction of the chemically strengthened glass-ceramic, from a distance of 2 times DOL_0 from the main surface of the chemically strengthened glass-ceramic to half the thickness of the chemically strengthened glass-ceramic, is expressed as the ratio to the thickness t, in MPa / mm, where x is the depth from the main surface of the chemically strengthened glass-ceramic. 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.

2. The chemically strengthened microcrystalline glass according to claim 1, characterized in that, A≥50000。 3. The chemically strengthened microcrystalline glass according to claim 2, characterized in that, A≥51000。 4. The chemically strengthened microcrystalline glass according to claim 1, characterized in that, The value of A is between 49500 and 65000.

5. The chemically strengthened microcrystalline glass according to any one of claims 1 to 4, characterized in that, The chemically strengthened glass-ceramic satisfies the following relationship: B=[|CT_AV|×(t / 2-DOL_0)]×[5×M K2O / (5×M K2O +0.5×M Na2O )], B≥9000 MPa·μm; Where |CT_AV| is the absolute value of the average tensile stress, t represents the thickness of the chemically strengthened glass-ceramic. M K2O This represents the mass percentage of K₂O on the surface of chemically strengthened glass-ceramics. M Na2O The percentage by mass of Na2O on the surface of chemically strengthened glass-ceramics.

6. The chemically strengthened microcrystalline glass according to claim 5, characterized in that, B≥9100 MPa·μm.

7. The chemically strengthened microcrystalline glass according to claim 6, characterized in that, B≥9200 MPa·μm.

8. The chemically strengthened microcrystalline glass according to claim 5, characterized in that, The value of B is 9000 MPa·μm~13000 MPa·μm.

9. The chemically strengthened glass-ceramic according to any one of claims 1 to 4, characterized in that, The chemically strengthened glass-ceramic satisfies the following relationship: C=CS_50 / |CT_CV|, C≥0.85; where CS_50 refers to the compressive stress value at a depth of 50μm from the main surface of the chemically strengthened glass-ceramic, in MPa, and |CT_CV| is the absolute value of the maximum tensile stress, in MPa.

10. The chemically strengthened microcrystalline glass according to claim 9, characterized in that, The value of C is 0.85~1.

5.

11. The chemically strengthened glass-ceramic according to claim 10, characterized in that, The value of C is 0.9 to 1.

3.

12. The chemically strengthened glass-ceramic according to claim 11, characterized in that, The value of C is 0.9 to 1.

2.

13. The chemically strengthened microcrystalline glass according to claim 5, characterized in that, The chemically strengthened glass-ceramic satisfies the following relationship: C=CS_50 / |CT_CV|, C≥0.85; where CS_50 refers to the compressive stress value at a depth of 50μm from the main surface of the chemically strengthened glass-ceramic, in MPa, and |CT_CV| is the absolute value of the maximum tensile stress, in MPa.

14. The chemically strengthened glass-ceramic according to any one of claims 1 to 4, characterized in that, The chemically strengthened glass-ceramic satisfies: 140.00 MPa ≤ CS_50, where CS_50 refers to the compressive stress value at a depth of 50 μm from the main surface of the chemically strengthened glass-ceramic; and / or, 90.00μm≤DOL_0, where DOL_0 is the compressive stress layer depth; and / or, 0.18≤DOL_0 / t, where DOL_0 is the compressive stress layer depth and t is the thickness of the chemically strengthened glass-ceramic; and / or, 150MPa≤|CT_CV|, where |CT_CV| is the absolute value of the maximum tensile stress; and / or, 100.00MPa≤|CT_AV|, where |CT_AV| is the absolute value of the average tensile stress; and / or, 65000.00MPa / mm≤CT_LD≤90000.00MPa / mm, where CT_LD refers to the tensile stress linear density; and / or, M K2O ≤3.0%, of which M K2O The mass percentage of K2O on the surface of chemically strengthened glass-ceramics; and / or, M Na2O ≥5.0%, of which M Na2O The percentage by mass of Na2O on the surface of chemically strengthened glass-ceramics.

15. The chemically strengthened glass-ceramic according to claim 14, characterized in that, The chemically strengthened glass-ceramic satisfies: 180.00MPa≤CS_50; and / or, 100.00μm≤DOL_0; and / or, 0.20≤DOL_0 / t≤0.25; and / or, 150MPa≤|CT_CV|≤250MPa; and / or, 100.00MPa≤|CT_AV|≤160.00MPa; and / or, 70000.00MPa / mm≤CT_LD≤90000.00MPa / mm; and / or, M K2O It is 0.2% to 2%; and / or, M Na2O It ranges from 5.0% to 20%.

16. The chemically strengthened glass-ceramic according to claim 15, characterized in that, The chemically strengthened glass-ceramic satisfies: 180.00MPa≤CS_50≤240.00MPa; and / or, 100.00μm≤DOL_0≤160.00μm; and / or, 0.22≤DOL_0 / t≤0.23; and / or, 180MPa≤|CT_CV|≤250MPa; and / or, 130.00MPa≤|CT_AV|≤160.00MPa; and / or, M K2O The percentage is 0.3% to 1.6%; and / or, M Na2O It ranges from 6% to 17%.

17. The chemically strengthened glass-ceramic according to claim 16, characterized in that, The chemically strengthened glass-ceramic satisfies: 200MPa≤CS_50≤240.00MPa.

18. The chemically strengthened glass-ceramic according to claim 13, characterized in that, The chemically strengthened glass-ceramic satisfies: 140.00 MPa ≤ CS_50, where CS_50 refers to the compressive stress value at a depth of 50 μm from the main surface of the chemically strengthened glass-ceramic; and / or, 90.00μm≤DOL_0, where DOL_0 is the compressive stress layer depth; and / or, 0.18≤DOL_0 / t, where DOL_0 is the compressive stress layer depth and t is the thickness of the chemically strengthened glass-ceramic; and / or, 150MPa≤|CT_CV|, where |CT_CV| is the absolute value of the maximum tensile stress; and / or, 100.00MPa≤|CT_AV|, where |CT_AV| is the absolute value of the average tensile stress; and / or, 65000.00MPa / mm≤CT_LD≤90000.00MPa / mm, where CT_LD refers to the tensile stress linear density; and / or, M K2O ≤3.0%, of which M K2O The mass percentage of K2O on the surface of chemically strengthened glass-ceramics; and / or, M Na2O ≥5.0%, of which M Na2O The percentage by mass of Na2O on the surface of chemically strengthened glass-ceramics.

19. The chemically strengthened glass-ceramic according to any one of claims 1 to 4, characterized in that, 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 M' of K2O on the surface of the chemically strengthened glass-ceramic. K2O The mass percentage M' of Na2O on the surface of the chemical microcrystalline glass Na2O for: M’ K2O ＜3.0%， M’ Na2O ＜15.0%。 20. The chemically strengthened glass-ceramic according to claim 19, characterized in that, M' K2O For 0%~1%, M' Na2O The percentage is 3.0% to 14%.

21. The chemically strengthened glass-ceramic according to claim 20, characterized in that, M' K2O The concentration is 0.1%~0.5%, M' Na2O It ranges from 4% to 12%.

22. The chemically strengthened glass-ceramic according to claim 18, characterized in that, 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 M' of K2O on the surface of the chemically strengthened glass-ceramic. K2O The mass percentage M' of Na2O on the surface of the chemical microcrystalline glass Na2O for: M’ K2O ＜3.0%， M’ Na2O ＜15.0%。 23. The chemically strengthened glass-ceramic according to any one of claims 1 to 4, characterized in that, The crystallinity of the chemically strengthened microcrystalline glass is not less than 60%; and / or, In the chemically strengthened microcrystalline glass, the average grain size does not exceed 50 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 65%~90%; and / or, In the chemically strengthened microcrystalline glass, the average grain size is 10 nm to 40 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, The crystallinity of the chemically strengthened microcrystalline glass is 70%~80%; and / or, 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 not less than 60%; and / or, In the chemically strengthened microcrystalline glass, the average grain size does not exceed 50 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 microcrystalline glass according to any one of claims 1 to 4, characterized in that, When the thickness does not exceed 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, and for 550nm wavelength light, the transmittance of the chemically strengthened microcrystalline glass is ≥85%.

28. The chemically strengthened glass-ceramic according to claim 27, characterized in that, When the thickness does not exceed 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 ≥90%.

29. The chemically strengthened glass-ceramic according to claim 28, characterized in that, When the thickness does not exceed 0.70 mm, the b-value of the chemically strengthened microcrystalline glass is ≤0.6; and / or, For light with a wavelength of 550 nm, the transmittance of the chemically strengthened microcrystalline glass is ≥90.2%.

30. The chemically strengthened microcrystalline glass according to claim 26, characterized in that, When the thickness does not exceed 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, and for 550nm wavelength light, the transmittance of the chemically strengthened microcrystalline glass is ≥85%.

31. The chemically strengthened microcrystalline glass according to any one of claims 1 to 4, characterized in that, The chemically strengthened microcrystalline glass has a Young's modulus of not less than 100 GPa; and / or, The density of the chemically strengthened microcrystalline glass is not less than 2.54 g / cm³. 3 ; and / or, The refractive index of the chemically strengthened microcrystalline glass is ≤1.60; and / or, The chemically strengthened microcrystalline glass has a Vickers hardness ≥ 700 kgf / mm². 2 .

32. The chemically strengthened microcrystalline glass according to claim 31, characterized in that, The chemically strengthened microcrystalline glass has a Young's modulus of not less than 110 GPa; and / or, The density of the chemically strengthened microcrystalline glass is 2.54 g / cm³. 3 ~2.64g / cm 3 ; and / or, The refractive index of the chemically strengthened microcrystalline glass is 1.55~1.60; and / or, The Vickers hardness of the chemically strengthened microcrystalline glass is 700 kgf / mm. 2 ~850kgf / mm 2 .

33. The chemically strengthened microcrystalline glass according to claim 32, characterized in that, The Young's modulus of the chemically strengthened microcrystalline glass is 110 GPa to 130 GPa.

34. The chemically strengthened glass-ceramic according to claim 30, characterized in that, The chemically strengthened microcrystalline glass has a Young's modulus of not less than 100 GPa; and / or, The density of the chemically strengthened microcrystalline glass is not less than 2.54 g / cm³. 3 ; and / or, The refractive index of the chemically strengthened microcrystalline glass is ≤1.60; and / or, The chemically strengthened microcrystalline glass has a Vickers hardness ≥ 700 kgf / mm². 2 .

35. The chemically strengthened glass-ceramic according to any one of claims 1 to 4, characterized in that, The thickness t of the chemically strengthened glass-ceramic is 0.35mm~1.0mm; and / or, the chemically strengthened glass-ceramic is 2D, 2.5D, 3D or irregularly shaped; and / or, the chemically strengthened glass-ceramic is of uniform thickness or unequal thickness.

36. The chemically strengthened microcrystalline glass according to claim 35, characterized in that, The thickness t of the chemically strengthened microcrystalline glass is 0.4 mm to 0.7 mm.

37. The chemically strengthened glass-ceramic according to claim 36, characterized in that, The thickness t of the chemically strengthened microcrystalline glass is 0.45mm~0.55mm.

38. The chemically strengthened glass-ceramic according to claim 34, characterized in that, The thickness t of the chemically strengthened glass-ceramic is 0.35mm~1.0mm; and / or, the chemically strengthened glass-ceramic is 2D, 2.5D, 3D or irregularly shaped; and / or, the chemically strengthened glass-ceramic is of uniform thickness or unequal thickness.

39. The chemically strengthened microcrystalline glass according to any one of claims 1 to 4, characterized in that, The chemically strengthened microcrystalline glass was subjected to a sandpaper drop test using 80-grit sandpaper. With a thickness not exceeding 0.70 mm, the average sandpaper drop height resisted by the chemically strengthened microcrystalline glass was ≥1.60 m; and / or, The chemically strengthened glass-ceramic was pressed with a 10mm diameter round-headed metal bar, and the static compressive strength of a single bar that the chemically strengthened glass-ceramic could withstand was tested. The average static compressive strength of a single bar that the chemically strengthened glass-ceramic could withstand was greater than 200N.

40. The chemically strengthened microcrystalline glass according to claim 39, characterized in that, The chemically strengthened microcrystalline glass was subjected to a sandpaper drop test using 80-grit sandpaper. With a thickness not exceeding 0.70 mm, the average sandpaper drop height resisted by the chemically strengthened microcrystalline glass was 1.65 m to 2.50 m; and / or, The chemically strengthened glass-ceramic was pressed with a 10mm diameter round-headed metal bar, and the static compressive strength of a single bar that the chemically strengthened glass-ceramic could withstand was tested. The average static compressive strength of a single bar that the chemically strengthened glass-ceramic could withstand was greater than 230N.

41. The chemically strengthened microcrystalline glass according to claim 39, 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 was 0.4mm to 0.7mm, the average sandpaper drop height of the chemically strengthened microcrystalline glass was ≥1.60m.

42. The chemically strengthened glass-ceramic according to claim 41, 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 was 0.4mm to 0.7mm, the average sandpaper drop height of the chemically strengthened microcrystalline glass was 1.65m to 2.50m.

43. The chemically strengthened microcrystalline glass according to claim 39, 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 was 0.45mm~0.55mm, the average sandpaper drop height of the chemically strengthened microcrystalline glass was ≥1.60m.

44. The chemically strengthened glass-ceramic according to claim 43, 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 was 0.45mm to 0.55mm, the average sandpaper drop height of the chemically strengthened microcrystalline glass was 1.65m to 2.50m.

45. The chemically strengthened glass-ceramic according to claim 38, characterized in that, The chemically strengthened microcrystalline glass was subjected to a sandpaper drop test using 80-grit sandpaper. With a thickness not exceeding 0.70 mm, the average sandpaper drop height resisted by the chemically strengthened microcrystalline glass was ≥1.60 m; and / or, The chemically strengthened glass-ceramic was pressed with a 10mm diameter round-headed metal bar, and the static compressive strength of a single bar that the chemically strengthened glass-ceramic could withstand was tested. The average static compressive strength of a single bar that the chemically strengthened glass-ceramic could withstand was greater than 200N.

46. ​​The chemically strengthened glass-ceramic according to claim 13, characterized in that, The chemically strengthened glass-ceramic satisfies: The values ​​of relation A are: 54802.89, 51024.81, 57170.35, 52689.22, 52272.54, 58526.63, 54807.04, 56429.32, 52815.28, 53580.63, 54032.42, 54060.10, 53361.40, or 54841.31; and / or, The values ​​of relation B are: 10333.74 MPa·μm, 11642.77 MPa·μm, 11864.03 MPa·μm, 10818.69 MPa·μm, 10199.45 MPa·μm, 10638.55 MPa·μm, 10862.45 MPa·μm, 9442.20 MPa·μm, 9292.34 MPa·μm, 10157.90 MPa·μm, 10637.99 MPa·μm, 10907.18 MPa·μm, 10429.05 MPa·μm, or 11586.62 MPa·μm; and / or, The values ​​of relation C are: 0.93, 1.12, 1.00, 0.97, 1.03, 0.99, 1.01, 0.98, 0.92, 1.05, or 1.

06.

47. The chemically strengthened glass-ceramic according to any one of claims 1 to 4, characterized in that, The tensile stress layer of the chemically strengthened glass-ceramic, based on the molar percentage of oxides, comprises: The molar percentage of SiO2 is 60%~65%; and / or, The molar percentage of Al2O3 is 1%~2.5%; and / or, The molar percentage of P2O5 is 1%~2%; and / or, The molar percentage of ZrO2 is 4%~5%; and / or, The molar percentage of Li2O is 27%~31%; and / or, The molar percentage of SrO is 0%~2%; and / or, The molar percentage of Na₂O is 0%~2.6%; and / or, The molar percentage of K2O is 0%~0.7%; and / or, The molar percentage of CaO is 0%~1%; and / or, The molar percentage of B2O3 is 0%~0.7%; and / or, The molar percentage of Ta₂O₅ is 0%~0.7%; and / or, The molar percentage of BaO is 0%~2%.

48. The chemically strengthened glass-ceramic according to claim 47, characterized in that, The tensile stress layer of the chemically strengthened glass-ceramic, based on the molar percentage of oxides, comprises: The molar percentage of SiO2 is 60.5%~64.5%; and / or, The molar percentage of Al2O3 is 1%~2%; and / or, The molar percentage of P2O5 is 1.2%~2%; and / or, The molar percentage of ZrO2 is 4.2%~5%; and / or, The molar percentage of Li2O is 27%~30%; and / or, The molar percentage of SrO is 0%~1.9%; and / or, The molar percentage of Na2O is 0%~1%; and / or, The molar percentage of K2O is 0%~0.5%; and / or, The molar percentage of CaO is 0%~0.95%; and / or, The molar percentage of B2O3 is 0%~0.5%; and / or, The molar percentage of Ta2O5 is 0%~0.5%; and / or, The molar percentage of BaO is 0%~1.9%.

49. The chemically strengthened microcrystalline glass according to claim 48, characterized in that, The tensile stress layer of the chemically strengthened glass-ceramic, 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 1.50%~2%; and / or, The molar percentage of Li2O is 27.5%~30%.

50. The chemically strengthened glass-ceramic according to claim 45, characterized in that, The tensile stress layer of the chemically strengthened glass-ceramic, based on the molar percentage of oxides, comprises: The molar percentage of SiO2 is 60%~65%; and / or, The molar percentage of Al2O3 is 1%~2.5%; and / or, The molar percentage of P2O5 is 1%~2%; and / or, The molar percentage of ZrO2 is 4%~5%; and / or, The molar percentage of Li2O is 27%~31%; and / or, The molar percentage of SrO is 0%~2%; and / or, The molar percentage of Na₂O is 0%~2.6%; and / or, The molar percentage of K2O is 0%~0.7%; and / or, The molar percentage of CaO is 0%~1%; and / or, The molar percentage of B2O3 is 0%~0.7%; and / or, The molar percentage of Ta₂O₅ is 0%~0.7%; and / or, The molar percentage of BaO is 0%~2%.

51. The chemically strengthened glass-ceramic according to any one of claims 1 to 4, characterized in that, The chemically strengthened glass-ceramic satisfies: 2.00≤n(SiO2) / n(Li2O)≤2.40; and / or, 90%≤n(SiO2)+n(Li2O)≤95%; where n(SiO2) is the molar percentage content of SiO2 in the chemically strengthened microcrystalline glass tensile stress layer, and n(Li2O) is the molar percentage content of Li2O in the chemically strengthened microcrystalline glass tensile stress layer.

52. The chemically strengthened microcrystalline glass according to claim 51, characterized in that, The chemically strengthened glass-ceramic satisfies: 2.00≤n(SiO2) / n(Li2O)≤2.30; and / or, 90%≤n(SiO2)+n(Li2O)≤92%.

53. The chemically strengthened microcrystalline glass according to claim 52, characterized in that, The chemically strengthened glass-ceramic satisfies: 2.02≤n(SiO2) / n(Li2O)≤2.

20.

54. The chemically strengthened microcrystalline glass according to claim 52, characterized in that, The chemically strengthened glass-ceramic satisfies: 2.07≤n(SiO2) / n(Li2O)≤2.

30.

55. The chemically strengthened glass-ceramic according to claim 50, characterized in that, The chemically strengthened glass-ceramic satisfies: 2.00≤n(SiO2) / n(Li2O)≤2.40; and / or, 90%≤n(SiO2)+n(Li2O)≤95%; where n(SiO2) is the molar percentage content of SiO2 in the chemically strengthened microcrystalline glass tensile stress layer, and n(Li2O) is the molar percentage content of Li2O in the chemically strengthened microcrystalline glass tensile stress layer.

56. The chemically strengthened microcrystalline glass according to any one of claims 1 to 4, characterized in that, The tensile stress layer of the chemically strengthened glass-ceramic, based on the mass percentage of oxides, comprises: SiO2: 60%~70%, Al2O3: 0%~3.5%, P2O5: 2%~8%, ZrO2: 8%~12%, Li2O: 14%~20%, SrO: 0 %~6%, Na2O: 0%~3%, K2O: 0%~2%, CaO: 0%~2%, B2O3: 0%~1%, Ta2O5: 0%~2%, BaO: 0%~6%.

57. The chemically strengthened microcrystalline glass according to claim 56, characterized in that, The 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%~3.5%; and / or, The mass percentage of P2O5 is 3%~6%; and / or, The mass percentage of ZrO2 is 8%~11%; and / or, The mass percentage of Li2O is 14%~18%; and / or, The mass percentage of SrO is 0%~5%; 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%~1%; and / or, The mass percentage of B2O3 is 0%~0.8%; and / or, The mass percentage of Ta2O5 is 0%~1.8%; and / or, The mass percentage of BaO is 0%~5.5%.

58. The chemically strengthened microcrystalline glass according to claim 57, characterized in that, The tensile stress layer of the chemically strengthened glass-ceramic, based on the mass percentage of oxides, comprises: The mass percentage of SiO2 is 63%~67%; and / or, The mass percentage of Al2O3 is 2%~3.5%; and / or, The mass percentage of P2O5 is 3%~5%; and / or, The mass percentage of ZrO2 is 9%~11%; and / or, The mass percentage of Li2O is 14%~17%; and / or, The mass percentage of SrO is 0%~4%; and / or, The mass percentage of Na2O is 0%~1%; and / or, The mass percentage of K2O is 0%~1.2%; and / or, The mass percentage of CaO is 0%~0.95%; and / or, The mass percentage of B2O3 is 0%~0.6%; and / or, The mass percentage of Ta2O5 is 0%~1.5%; and / or, The mass percentage of BaO is 0%~5%.

59. The chemically strengthened microcrystalline glass according to claim 58, characterized in that, The 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 P2O5 is 4%~5%; and / or, The mass percentage of Li2O is 14%~16%.

60. A cover glass, characterized in that, The cover glass comprises chemically strengthened microcrystalline glass as described in any one of claims 1-59.

61. An electronic device, characterized in that, The electronic device comprises chemically strengthened microcrystalline glass as described in any one of claims 1-59.

62. The electronic device according to claim 61, 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 1-59.

63. The electronic device according to claim 62, 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 1-59.

64. The electronic device according to claim 62 or 63, 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 1-59.

65. The electronic device according to any one of claims 62 to 63, 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 1-59.

66. The electronic device according to any one of claims 62 to 63, 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 1-59.

67. A glass device, characterized in that, The glass device comprises chemically strengthened microcrystalline glass as described in any one of claims 1-59.

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