Chemically strengthened microcrystalline glass, cover glass plate, electronic device, and glass component

Abstract

The present application belongs to the technical field of microcrystalline glass. Provided are a chemically strengthened microcrystalline glass, a cover glass plate, an electronic device and a glass component. A high-lithium-content microcrystalline glass having a specific composition and using lithium disilicate as a principal crystalline phase undergoes chemical strengthening treatment so as to satisfy specific stress characteristics, especially the molar percentage content of ZrO2 in the microcrystalline glass and the stress characteristic relational expression A satisfy specific requirements, i.e. satisfying the requirement of range of a relational expression B. Therefore, the present application solves the problem of "surface cracking" of the manufactured chemically strengthened microcrystalline glass and can also ensure that the chemically strengthened microcrystalline glass has high mechanical strength, thereby ensuring that the chemically strengthened microcrystalline glass has excellent damage resistance.

Description

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

[0001] Cross-reference to Related Applications

[0002] This application claims priority to the Chinese patent application No. 202411386703.2, filed on September 30, 2024, entitled “Chemically strengthened glass-ceramics, cover glass, electronic device and glass article”, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of glass-ceramics, and in particular to a chemically strengthened glass-ceramics, cover glass, electronic device and glass article. BACKGROUND

[0004] Glass-ceramics, as a kind of solid material containing microcrystalline phase and glass phase, has obvious advantages in overall strength performance over ordinary glass due to the large number of small crystals contained therein that can hinder the propagation of microcracks. Currently, glass-ceramics have begun to be applied in electronic devices, for example, as cover glass of portable electronic devices, and for example, the applications of glass-ceramics include but are not limited to display screen cover, back cover, camera protection cover, etc.

[0005] In glass-ceramics, common crystal phases include lithium metasilicate, lithium disilicate, petalite, quartz, quartz solid solution, spinel, spodumene, nepheline, zirconia, etc. Among them, lithium disilicate (Li2Si2O5) is an orthorhombic crystal based on [Si2O5] tetrahedral array, and the shape of the crystal is flat or plate-like. In the interior of glass-ceramics, lithium disilicate crystals often have a random orientation microstructure, which can force the path of a crack to twist when passing through the crystal, thereby helping to stop the propagation of the crack and improve the strength and fracture toughness of the glass-ceramics. At the same time, lithium disilicate crystals are also ideal crystal phases for preparing high-transparency glass-ceramics. Therefore, glass-ceramics with lithium disilicate as the main crystal phase have great application potential in the cover glass market of electronic devices.

[0006] As a cover glass for electronic devices, especially for portable electronic devices (such as mobile phones, tablet computers, smart watches, smart bracelets, etc.), in addition to strength, it is also desirable for the glass-ceramics used as cover glass in portable electronic devices to be as thin as possible. In order to obtain high strength performance for the glass-ceramics as thin as possible so as to better cope with problems such as squeezing, impact, scratching, wear, etc., it is usually necessary to perform chemical strengthening treatment on the glass-ceramics.

[0007] Since lithium element is a necessary component of lithium disilicate crystal phase, and lithium ion is the key ion for ion exchange of lithium disilicate glass-ceramics in the chemical strengthening process, in order to obtain lithium disilicate glass-ceramics which can be strengthened and has high crystal phase content, and to ensure that the strengthened glass-ceramics has high stress level, a large amount of lithium is usually added to the glass composition.

[0008] Application content

[0009] Without being limited by any theory, for the lithium disilicate-based glass-ceramics with high lithium content, when the chemical strengthening treatment is carried out in a molten salt bath, especially in a high-temperature molten salt bath, a large number of irregular cracks / crevices are easily generated on the surface of the prepared chemical strengthening glass-ceramics, which exist on the surface of the chemical strengthening glass-ceramics and have a depth of 10 μm to 100 μm, hereinafter referred to as "surface cracking". The "surface cracking" problem of the chemical strengthening glass-ceramics will greatly reduce the drop damage resistance and mechanical strength of the chemical strengthening glass-ceramics, and more seriously, even directly cause the surface of the chemical strengthening glass-ceramics to fail due to too many cracks / crevices, and cannot be used.

[0010] Further, the inventors found that when the lithium disilicate-based glass-ceramics with high lithium content is subjected to chemical strengthening treatment to prepare chemical strengthening glass-ceramics with desired properties, the matching relationship between the glass composition and the stress distribution structure is very important. If the two are not matched, the problem of "surface cracking" of the prepared chemical strengthening glass-ceramics is easily generated, which greatly reduces the mechanical strength of the chemical strengthening glass-ceramics. When the glass-ceramics with a specific composition is matched to a suitable and optimal stress distribution structure, not only the problem of "surface cracking" of the prepared chemical strengthening glass-ceramics can be overcome, but also the chemical strengthening glass-ceramics has high mechanical strength.

[0011] The present application provides a chemical strengthening glass-ceramics, a cover glass, an electronic device and a glass device comprising the same, the chemical strengthening glass-ceramics has high lithium content, lithium disilicate as the main crystal phase, and has a specific composition and a specific stress distribution structure, so that the chemical strengthening glass-ceramics not only does not have the problem of "surface cracking", but also has high mechanical strength.

[0012] Specifically, the technical solutions provided by the present application include:

[0013] In a first aspect, a chemical strengthening glass-ceramics is provided, the main crystal phase of the chemical strengthening glass-ceramics is lithium disilicate crystal phase; the crystallinity of the chemical strengthening glass-ceramics is not less than 65%; the Li2O content at the center of the chemical strengthening glass-ceramics is not less than 11% in terms of mass percentage of oxide;

[0014] The surface of the chemically strengthened glass ceramic has a compressive stress layer and has a tensile stress layer inside; the chemically strengthened glass ceramic satisfies the following relationship:

[0015] B = A - 83989 * n(ZrO2) 2 + 2526.5 * n(ZrO2), 130≤B≤180, preferably, 135≤B≤180, more preferably, 135≤B≤175;

[0016] wherein t is the depth from the main surface of the chemically strengthened glass ceramic, CS(t) is the compressive stress value at the depth t, is the stress integral of the compressive stress layer from the main surface of the chemically strengthened glass ceramic to DOL_0, in units of MPa·μm;

[0017] DOL_0 is the depth of the compressive stress layer, in units of μm;

[0018] in the relationship A, the data is substituted for calculation according to the above unit requirements, and the calculation result is obtained, and the unit is not involved in the calculation;

[0019] n(ZrO2) is the mole percentage content of ZrO2 at the center of the chemically strengthened glass ceramic;

[0020] in the relationship B, the numerical value of the relationship A and the mole percentage content numerical value of ZrO2 are substituted for calculation, and the calculation result is obtained, and the unit is not involved in the calculation.

[0021] The present application can effectively overcome the problem of "surface cracking" of the prepared chemically strengthened glass ceramic by making the high lithium content glass ceramic with a specific composition, taking lithium disilicate as the main crystal phase, satisfying the specific stress characteristics after chemical strengthening treatment, especially making the mole percentage content of ZrO2 in the glass ceramic satisfy the specific requirements of the stress characteristic relationship A (i.e., satisfying the range requirements of the aforementioned relationship B), not only can effectively overcome the problem of "surface cracking" of the prepared chemically strengthened glass ceramic, but also can ensure that the chemically strengthened glass ceramic has high mechanical strength performance, and further can ensure that the chemically strengthened glass ceramic has excellent damage resistance.

[0022] Alternatively, the value of the relationship A satisfies: 120≤A≤250, preferably, 130≤A≤240, more preferably, 130≤A≤235. By making the chemically strengthened glass ceramic satisfy the relationship A, it is beneficial to make the chemically strengthened glass ceramic obtain the desired high stress level, and further beneficial to ensure that the chemically strengthened glass ceramic has high mechanical strength performance.

[0023] Optionally, the value of the relationship formula A is: 150.39, 155.13, 157.8, 163.95, 165.23, 167.78, 171.98, 130.02, 148.08, 153.52, 157.87, 150.70, 161.51, 200.59, 217.59, 234.24, 208.06, 207.14, 220.07, 224.21, or 226.66; and / or,

[0024] The value of the relationship formula B is: 144.41, 149.14, 151.82, 157.96, 159.24, 161.80, 166.00, 148.99, 165.83, 168.65, 170.67, 163.85, 155.53, 136.18, 155.43, 172.09, 147.01, 147.17, 165.17, 164.24, or 166.69.

[0025] Optionally, the chemically strengthened microcrystalline glass satisfies the following relationship formula: C = A - |CT_AV|, 30 ≤ C ≤ 90, preferably 30 ≤ C ≤ 85, more preferably 30 ≤ C ≤ 80, wherein |CT_AV| is the absolute value of the average tensile stress, in MPa. By making the chemically strengthened microcrystalline glass satisfy the relationship formula C, it helps to overcome the problem of "surface cracking" of the prepared chemically strengthened microcrystalline glass, and is conducive to ensuring that the chemically strengthened microcrystalline glass has high mechanical strength performance.

[0026] Optionally, the value of the relationship formula C is: 33.97, 40.28, 37.3, 41.41, 47.67, 42.93, 45.51, 45.77, 52.74, 53.28, 51.42, 52.28, 37.27, 64.74, 70.95, 77.45, 57.85, 52.49, 67.32, 66.26, or 64.31.

[0027] Optionally, the chemically strengthened microcrystalline glass satisfies the following relationship formula: 2.0 ≤ |K 0.5×DOL_0 |≤ 6.0, wherein |K 0.5×DOL_0 The absolute value of the slope of the stress curve when the depth t of the distance from the main surface of the chemically strengthened microcrystalline glass is 0.5 × DOL_0.

[0028] Optionally, the chemically strengthened microcrystalline glass satisfies: 0 ≤ M(K2O) ≤ 1.5%, 5% ≤ M(Na2O) ≤ 25%; M(K2O) is the mass percentage of K2O on the surface of the chemically strengthened microcrystalline glass, and M(Na2O) is the mass percentage of Na2O on the surface of the chemically strengthened microcrystalline glass.

[0029] Optionally, after the two main surfaces of the chemically strengthened glass ceramic are each thinned by 3 μm in thickness, the chemically strengthened glass ceramic obtained satisfies: the mass percentage of K2O on the surface of the chemically strengthened glass ceramic M'(K2O) and the mass percentage of Na2O on the surface of the chemically strengthened glass ceramic M'(Na2O) are: 0≤M'(K2O)≤0.5%, and 4.0%≤M'(Na2O)≤20%.

[0030] Optionally, the composition at the center or the tensile stress layer of the chemically strengthened glass ceramic comprises, in terms of mole percentage of oxides:

[0031] SiO2: 58% to 66%, Al2O3: 0% to 3.5%, P2O5: 1% to 3%, ZrO2: 1% to 6%, and Li2O: 24% to 32%. In the present application, by adjusting and controlling the content range of each oxide component, it is beneficial to ensure that the chemically strengthened glass ceramic satisfying the desired crystal phase structure and stress structure is obtained.

[0032] Optionally, the composition at the center or the tensile stress layer of the chemically strengthened glass ceramic further comprises, in terms of mole percentage of oxides: SrO: 0% to 3%, and / or, Na2O: 0% to 4%, and / or, K2O: 0% to 2%, and / or, CaO: 0% to 5%, and / or, B2O3: 0% to 1%, and / or, Ta2O5: 0% to 1%, and / or, BaO: 0% to 3%, and / or, MgO: 0% to 3%, and / or, ZnO: 0% to 3%, and / or, Y2O3: 0% to 1%, and / or, La2O3: 0% to 1%, and / or, Yb2O3: 0% to 1%.

[0033] Optionally, the composition at the center or the tensile stress layer of the chemically strengthened glass ceramic comprises, in terms of mole percentage of oxides:

[0034] the mole percentage of SiO2 is 60% to 65%, and preferably 60.5% to 64.50%; and / or,

[0035] the mole percentage of Al2O3 is 0.5% to 3.5%, and preferably 1% to 1.5%; and / or,

[0036] the mole percentage of P2O5 is 1% to 2.8%, and preferably 1.20% to 2%; and / or,

[0037] the mole percentage of ZrO2 is 1% to 5%, and preferably 1.4% to 5%; and / or,

[0038] the mole percentage of Li2O is 24% to 31.6%, and preferably 27.5% to 31%; and / or,

[0039] Na2O in a molar percentage of 0% to 3%, preferably 0% to 1%; and / or,

[0040] K2O in a molar percentage of 0% to 1%, preferably 0% to 0.7%; and / or,

[0041] CaO in a molar percentage of 0% to 4%, preferably 0% to 3%; and / or,

[0042] BaO in a molar percentage of 0% to 2%, preferably 1% to 2%; and / or,

[0043] SrO in a molar percentage of 0% to 2%, preferably 1% to 2%; and / or,

[0044] MgO in a molar percentage of 0% to 2%; and / or,

[0045] ZnO in a molar percentage of 0% to 2%; and / or,

[0046] B2O3 in a molar percentage of 0% to 0.7%, preferably 0% to 0.5%; and / or,

[0047] Y2O3 in a molar percentage of 0% to 0.5%, preferably 0% to 0.2%; and / or,

[0048] La2O3 in a molar percentage of 0% to 0.5%, preferably 0% to 0.2%; and / or,

[0049] Ta2O5 in a molar percentage of 0% to 0.7%, preferably 0% to 0.5%; and / or,

[0050] Yb2O3 in a molar percentage of 0% to 0.7%, preferably 0% to 0.5%.

[0051] In the present application, the appropriate addition of alkaline earth metal oxides such as BaO, SrO, MgO, CaO, etc. is beneficial to improve the glass melting process, so that the glass is not easy to crystallize during the melting process, to a certain extent, it is beneficial to reduce the high temperature viscosity, increase the substrate glass density, increase the Young's modulus, and also to a certain extent, the glass can obtain higher stress after strengthening. The appropriate addition of rare earth metal oxides such as Y2O3, La2O3, Yb2O3, etc. can increase the substrate glass density and improve the Young's modulus of the microcrystalline glass. The appropriate addition of transition metal oxides such as Ta2O5 can increase the substrate glass density and improve the Young's modulus of the microcrystalline glass. The appropriate addition of alkali metal oxides such as Na2O and K2O can improve the glass melting process, but may reduce the stress of the chemically strengthened microcrystalline glass.

[0052] Optionally, the composition of the center or the compressive stress layer of the chemically strengthened microcrystalline glass comprises, in a molar percentage of oxides:

[0053] Si02at a mole percent of 60.92%, 60.94%, 61.15%, 61.16%, 61.43%, 61.72%, 61.82%, 62.58%, 62.77%, 63.16%, 63.39%, or 63.86%; and / or,

[0054] Al203at a mole percent of 1.14%, 1.22%, 1.23%, 1.37%, 1.38%, 1.4%, 1.42%, 1.43%, or 1.44%; and / or,

[0055] P205at a mole percent of 1.51%, 1.74%, 1.83%, 1.84%, 1.85%, 1.86%, 1.87%, 1.89%, or 1.92%; and / or,

[0056] Zr02at a mole percent of 1.44%, 1.89%, 2.18%, 2.34%, 2.36%, 3.23%, 4.47%, 4.57%, 4.59%, 4.61%, or 4.66%; and / or,

[0057] Li20at a mole percent of 27.54%, 29.25%, 29.38%, 29.52%, 29.8%, 30.22%, 30.4%, 30.44%, 30.81%, or 31.51%; and / or,

[0058] Na20at a mole percent of 0% or 0.3%; and / or,

[0059] K20at a mole percent of 0% or 0.46%; and / or,

[0060] CaO at a mole percent of 0%, 0.92%, or 2.67%; and / or,

[0061] BaO at a mole percent of 0%, 0.91%, 1.38%, or 1.83%; and / or,

[0062] SrO at a mole percent of 0%, 0.91%, 0.92%, 1.38%, 1.42%, or 1.83%; and / or,

[0063] MgO at a mole percent of 0%, 0.2%, or 1.83%; and / or,

[0064] ZnO at a mole percent of 0%, 0.54%, or 1.67%; and / or,

[0065] B203at a mole percent of 0% or 0.46%; and / or,

[0066] a molar percentage of Y2O3 of 0% or 0.2%, and / or,

[0067] a molar percentage of La2O3 of 0% or 0.2%; and / or,

[0068] a molar percentage of Ta2O5 of 0%, 0.46% or 0.5%; and / or,

[0069] a molar percentage of Yb2O3 of 0% or 0.46%.

[0070] Optionally, the chemically strengthened glass-ceramics satisfy:

[0071] 2.00≤n(SiO2) / n(Li2O)≤2.40, preferably 2.00≤n(SiO2) / n(Li2O)≤2.30, more preferably 2.02≤n(SiO2) / n(Li2O)≤2.20, wherein n(SiO2), n(Li2O) are the molar percentage contents of SiO2, Li2O at the center of the chemically strengthened glass-ceramics or in the tensile stress layer, respectively; and / or,

[0072] 90%≤n(SiO2)+n(Li2O)≤96%, preferably 90%≤n(SiO2)+n(Li2O)≤95%, wherein n(SiO2), n(Li2O) are the molar percentage contents of SiO2, Li2O at the center of the chemically strengthened glass-ceramics, respectively; and / or,

[0073] 20%≤2.25×n(Li2O)-8×n(ZrO2)-0.2×n(CaO)≤60%, preferably 25%≤2.25×n(Li2O)-8×n(ZrO2)-0.2×n(CaO)≤60%, wherein n(Li2O), n(ZrO2), n(CaO) are the molar percentage contents of Li2O, ZrO2, CaO at the center of the chemically strengthened glass-ceramics or in the tensile stress layer, respectively; and / or,

[0074] 0%≤n(Y2O3)+n(La2O3)+n(Ta2O5)+n(Yb2O3)≤1%, preferably 0%≤n(Y2O3)+n(La2O3)+n(Ta2O5)+n(Yb2O3)≤0.7%, wherein n(Y2O3), n(La2O3), n(Ta2O5), n(Yb2O3) are the molar percentage contents of Y2O3, La2O3, Ta2O5, Yb2O3 at the center of the chemically strengthened glass-ceramics or in the tensile stress layer, respectively; and / or,

[0075] 0%≤n(SrO)+n(BaO)+n(CaO)+n(MgO)≤3%, preferably, 0%≤n(SrO)+n(BaO)+n(CaO)+n(MgO)≤2.7%, wherein n(SrO), n(BaO), n(CaO), n(MgO) are the molar percentage contents of SrO, BaO, CaO, MgO in the center of the chemically strengthened glass-ceramics or in the tensile stress layer, respectively; and / or,

[0076] 0≤n(SrO) / [n(SrO)+n(BaO)+n(CaO)+n(MgO)]≤1, wherein n(SrO), n(BaO), n(CaO), n(MgO) are the molar percentage contents of SrO, BaO, CaO, MgO in the center of the chemically strengthened glass-ceramics or in the tensile stress layer, respectively. In the present application, by adjusting and controlling the content relationship of each oxide, it is beneficial to ensure that the glass-ceramics meeting the desired performance and taking lithium disilicate as the main crystalline phase structure are obtained, and it is also beneficial to realize the desired stress distribution structure.

[0077] Optionally, the chemically strengthened glass-ceramics satisfy:

[0078] The value of n(SiO2) / n(Li2O) is 2.01, 2.03, 2.07, 2.08, 2.09, 2.10 or 2.28, wherein n(SiO2), n(Li2O) are the molar percentage contents of SiO2, Li2O in the center of the chemically strengthened glass-ceramics or in the tensile stress layer, respectively; and / or,

[0079] The value of n(SiO2)+n(Li2O) is 90.17%, 90.19%, 90.31%, 90.4%, 90.41%, 90.81%, 91.24%, 91.62%, 92.16%, 93.38%, 93.39%, 94.26% or 94.9%, wherein n(SiO2), n(Li2O) are the molar percentage contents of SiO2, Li2O in the center of the chemically strengthened glass-ceramics or in the tensile stress layer, respectively; and / or,

[0080] The value of 2.25*n(Li2O)-8*n(ZrO2)-0.2*n(CaO) is 29.39%, 29.77%, 30.05%, 42.65%, 43.99%, 50.6%, 52.02%, 52.88% or 56.88%, wherein n(Li2O), n(ZrO2), n(CaO) are the molar percentage contents of Li2O, ZrO2, CaO in the center of the chemically strengthened glass-ceramics or in the tensile stress layer, respectively; and / or,

[0081] n(Y2O3) + n(La2O3) + n(Ta2O5) + n(Yb2O3) is 0%, 0.2%, 0.46% or 0.7%, wherein n(Y2O3), n(La2O3), n(Ta2O5), n(Yb2O3) are the molar percentage contents of Y2O3, La2O3, Ta2O5, Yb2O3 in the center or in the tensile stress layer of the chemically strengthened glass-ceramics, respectively; and / or,

[0082] n(SrO) + n(BaO) + n(CaO) + n(MgO) is 0%, 0.2%, 0.92%, 1.38%, 1.42%, 1.83% or 2.67%, wherein n(SrO), n(BaO), n(CaO), n(MgO) are the molar percentage contents of SrO, BaO, CaO, MgO in the center or in the tensile stress layer of the chemically strengthened glass-ceramics, respectively.

[0083] n(SrO) / [n(SrO) + n(BaO) + n(CaO) + n(MgO)] is 0, 0.5 or 1, wherein n(SrO), n(BaO), n(CaO), n(MgO) are the molar percentage contents of SrO, BaO, CaO, MgO in the center or in the tensile stress layer of the chemically strengthened glass-ceramics, respectively.

[0084] Optionally, the composition of the center or the tensile stress layer of the chemically strengthened glass-ceramics comprises, in mass percentage of oxides:

[0085] SiO2: 55% to 75%, Al2O3: 0% to 6%, P2O5: 2% to 8%, ZrO2: 3% to 12%, Li2O: 11% to 20%.

[0086] Optionally, the composition of the center or the tensile stress layer of the chemically strengthened glass-ceramics further comprises, in mass percentage of oxides: SrO: 0% to 6%, and / or, Na2O: 0% to 4%, and / or, K2O: 0% to 2%, and / or, CaO: 0% to 5%, and / or, B2O3: 0% to 1%, and / or, Ta2O5: 0% to 2%, and / or, BaO: 0% to 6%, and / or, MgO: 0% to 3%, and / or, ZnO: 0% to 3%, and / or, Y2O3: 0% to 2%, and / or, La2O3: 0% to 2%, and / or, Yb2O3: 0% to 4%.

[0087] Optionally, the composition of the center or the tensile stress layer of the chemically strengthened glass-ceramics comprises, in mass percentage of oxides:

[0088] The mass percentage of SiO2 is 60% to 71%, preferably 62% to 68%; and / or,

[0089] Al2O3 in a mass percentage of 1 to 6 %, preferably 1 to 3 %, more preferably 2 to 3 %; and / or,

[0090] P2O5 in a mass percentage of 3 to 6 %, preferably 3.5 to 5.5 %; and / or,

[0091] ZrO2 in a mass percentage of 4 to 11 %, preferably 4 to 10 %; and / or,

[0092] Li2O in a mass percentage of 11 to 18 %, preferably 12 to 17.5 %, more preferably 14 to 17 %; and / or,

[0093] Na2O in a mass percentage of 0 to 2.8 %, preferably 0 to 1 %; and / or,

[0094] K2O in a mass percentage of 0 to 1.5 %, preferably 0 to 1 %; and / or,

[0095] CaO in a mass percentage of 0 to 3 %, preferably 0 to 1 %; and / or,

[0096] BaO in a mass percentage of 0 to 5.5 %, more preferably 0 to 5 %; and / or,

[0097] SrO in a mass percentage of 0 to 5 %, preferably 0 to 3.5 %; and / or,

[0098] MgO in a mass percentage of 0 to 2 %; and / or,

[0099] ZnO in a mass percentage of 0 to 2.5 %; and / or,

[0100] B2O3 in a mass percentage of 0 to 0.8 %, preferably 0 to 0.5 %; and / or,

[0101] Y2O3 in a mass percentage of 0 to 1 %, preferably 0 to 0.8 %; and / or,

[0102] La2O3 in a mass percentage of 0 to 1.5 %, preferably 0 to 1 %; and / or,

[0103] Ta2O5 in a mass percentage of 0 to 1.5 %, preferably 0 to 0.5 %; and / or,

[0104] Yb2O3 in a mass percentage of 0 to 3.5 %, preferably 0 to 3 %.

[0105] Optionally, the chemical strengthening glass-ceramics has a crystallinity of 70% to 90%, more preferably, the chemical strengthening glass-ceramics has a crystallinity of 70% to 87%; and / or,

[0106] In the chemical strengthening glass-ceramics, the average grain size is not more than 100 nm, preferably, the average grain size is not more than 50 nm, more preferably, the average grain size is 15 nm to 30 nm; and / or,

[0107] In the chemical strengthening glass-ceramics, the lithium disilicate crystal phase accounts for 80wt% to 100wt% of all crystal phases; and / or,

[0108] In the chemical strengthening glass-ceramics, the mass percentage of petalite crystal phase is less than or equal to 10%, preferably, less than or equal to 5%, more preferably, the petalite crystal phase is not contained. The present application is beneficial to maintaining excellent optical performance while meeting excellent mechanical strength performance and high intrinsic strength by making the glass-ceramics meet the desired crystallinity and / or the desired crystal phase composition and / or the appropriate average grain size.

[0109] Optionally, the chemical strengthening glass-ceramics has a b value <1.0 when the thickness is not more than 0.70 mm, preferably, the b value <0.8, more preferably, the b value ≤0.6; and / or,

[0110] The chemical strengthening glass-ceramics is transparent in the visible light wavelength range, preferably, the transmittance of the chemical strengthening glass-ceramics is ≥85% for 550 nm wavelength light, preferably, the transmittance is ≥90%, more preferably, the transmittance is ≥90.27%. The chemical strengthening glass-ceramics meeting the b value and / or the transmittance can ensure better display effect and transparency effect, and is suitable for use in electronic device display screens which have requirements on display effect.

[0111] Optionally, the chemical strengthening glass-ceramics has a Young's modulus greater than 100 GPa, preferably, the Young's modulus is greater than 105 GPa, more preferably, the Young's modulus is 110 GPa to 130 GPa; and / or,

[0112] The chemical strengthening glass-ceramics has a density of 2.51 g / cm 3 to 2.65 g / cm 3 ; and / or,

[0113] The chemical strengthening glass-ceramics has a refractive index ≤1.60, preferably, the refractive index is 1.54 to 1.60; and / or,

[0114] the thickness T of the chemically strengthened glass-ceramics is 0.35 mm to 1.0 mm, preferably, the thickness T is 0.4 mm to 0.7 mm, more preferably, the thickness T is 0.45 mm to 0.55 mm; and / or,

[0115] the chemically strengthened glass-ceramics is 2D, 2.5D, 3D or special-shaped; and / or, the chemically strengthened glass-ceramics is equal-thickness or unequal-thickness. The Young's modulus, the density and the refractive index within the above ranges indicate that the chemically strengthened glass-ceramics has high intrinsic strength, which is conducive to achieving excellent mechanical strength performance and excellent damage resistance.

[0116] Optionally, the chemically strengthened glass-ceramics satisfies:

[0117] 0.20≤DOL_0 / T≤0.25, preferably, 0.21≤DOL_0 / T≤0.23, wherein DOL_0 is the depth of compressive stress layer, and T is the thickness of the chemically strengthened glass-ceramics; and / or,

[0118] 90.00 μm≤DOL_0≤160.00 μm, preferably, 100.00 μm≤DOL_0≤160.00 μm, wherein DOL_0 is the depth of compressive stress layer; and / or,

[0119] 100.00 MPa≤CS_50≤300.00 MPa, preferably, 110.00 MPa≤CS_50≤250.00 MPa, more preferably, 110.00 MPa≤CS_50≤240.00 MPa, wherein CS_50 is the compressive stress value at a depth of 50 μm from the main surface of the chemically strengthened glass-ceramics; and / or,

[0120] 80.00 MPa≤|CT_AV|≤200.00 MPa, preferably, 80.00 MPa≤|CT_AV|≤170.00 MPa, more preferably, 80.00 MPa≤|CT_AV|≤160.00 MPa, wherein |CT_AV| is the absolute value of the average tensile stress; and / or,

[0121] 40000.00 MPa / mm≤CT_LD≤100000.00 MPa / mm, preferably, 47000.00 MPa / mm≤CT_LD≤95000.00 MPa / mm, wherein CT_LD is the tensile stress line density. By making the chemically strengthened glass-ceramics satisfy the suitable stress characteristics, the application is conducive to obtaining a chemically strengthened glass-ceramics product with high stress level, thereby facilitating the improvement of the stress characteristics on the mechanical strength performance, and ensuring that the chemically strengthened glass-ceramics has no "surface cracking" problem while satisfying excellent damage resistance.

[0122] Optionally, the chemically strengthened glass ceramic is subjected to sandpaper drop test, and the sandpaper used is 80 mesh sandpaper. When the thickness is not more than 0.70 mm, the average sandpaper drop height of the chemically strengthened glass ceramic is ≥1.0 m, preferably, the average sandpaper drop height of the chemically strengthened glass ceramic is ≥1.2 m, more preferably, the average sandpaper drop height of the chemically strengthened glass ceramic is ≥1.6 m. The greater the average sandpaper drop height value measured, the better the drop damage resistance of the chemically strengthened glass ceramic.

[0123] In a second aspect, a glass device is provided, which comprises the chemically strengthened glass ceramic according to any one of the embodiments of the first aspect.

[0124] In a third aspect, a cover glass is provided, which comprises the chemically strengthened glass ceramic according to any one of the embodiments of the first aspect. The cover glass can be a display cover, a back cover or a camera protection cover of an electronic device.

[0125] In a fourth aspect, an electronic device is provided, which comprises the chemically strengthened glass ceramic according to any one of the embodiments of the first aspect.

[0126] Optionally, the electronic device comprises a housing assembled on the outer side of the electronic device, and the housing comprises the chemically strengthened glass ceramic according to any one of the embodiments of the first aspect.

[0127] Optionally, the housing comprises a display cover assembled on the front side of the electronic device, and the display cover comprises the chemically strengthened glass ceramic according to any one of the embodiments of the first aspect.

[0128] Optionally, the housing comprises a back cover assembled on the back side of the electronic device, and the back cover comprises the chemically strengthened glass ceramic according to any one of the embodiments of the first aspect.

[0129] Optionally, the electronic device further comprises a camera assembly located inside the housing, and the housing comprises a camera protection cover covering the camera assembly, and the camera protection cover comprises the chemically strengthened glass ceramic according to any one of the embodiments of the first aspect.

[0130] Optionally, the electronic device further comprises a middle frame located between the display module and the housing, and the middle frame comprises the chemically strengthened glass ceramic according to any one of the embodiments of the first aspect.

[0131] In some embodiments, the housing can be partially made of the chemically strengthened glass ceramic or entirely made of the chemically strengthened glass ceramic. The electronic device in the present application can be one or more of the display cover, the back cover, the camera protection cover and the middle frame, which are made of the chemically strengthened glass ceramic according to any one of the embodiments of the first aspect.

[0132] The above technical solutions provided by the present application include one or more of the following advantages compared with the prior art:

[0133] The present application can effectively overcome the problem of "surface cracking" of the prepared chemically strengthened glass-ceramics, and ensure that the chemically strengthened glass-ceramics has high mechanical strength performance, and further ensure that the chemically strengthened glass-ceramics has excellent damage resistance. BRIEF DESCRIPTION OF DRAWINGS

[0134] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and serve to explain the principles of the present application. It is to be understood that the following drawings are merely exemplary of certain embodiments of the present application and, therefore, should not be considered to limit the scope of the present application.

[0135] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0136] FIG. 1 is a photograph of the chemically strengthened glass-ceramics of Example 1 of the present application under strong light;

[0137] FIG. 2 is a photograph of the chemically strengthened glass-ceramics of Comparative Example 5 of the present application under strong light;

[0138] FIG. 3 is a 2D microscopic picture of the main surface of the chemically strengthened glass-ceramics of Example 1 of the present application at 200 times magnification;

[0139] FIG. 4 is a 2D microscopic picture of the main surface of the chemically strengthened glass-ceramics of Comparative Example 5 of the present application at 100 times magnification;

[0140] FIG. 5 is a 2D microscopic picture of the cross section along the thickness direction of the chemically strengthened glass-ceramics of Example 1 of the present application at 200 times magnification after breaking;

[0141] FIG. 6 is a 2D microscopic picture of the cross section along the thickness direction of the chemically strengthened glass-ceramics of Comparative Example 5 of the present application at 200 times magnification after breaking;

[0142] FIG. 7 is a schematic diagram of the test position of stress tested by SLP-2000 for the sample of the embodiment of the present application, and the test point is located at the center of the sample. In the figure, 7-a is the edge of the main surface of the sample, 7-b is the area of the main surface of the sample, and 7-c is the area of the test point position of stress.

[0143] FIG. 8 is a schematic diagram of the test position of stress tested by SLP-2000 for the sample of the comparative example of the present application, and the test point is located at the center of the sample. In the figure, 8-a is the edge of the main surface of the sample, 8-b is the area of the "surface cracking" of the sample, 8-c is the area of the test point position of stress, and 8-d is the area of the sample without "surface cracking".

[0144] FIG. 9 is the optical transmittance curve of the chemically strengthened microcrystalline glass of Example 1 of the present application in the visible light wavelength range.

[0145] FIG. 10 is the XRD pattern of the microcrystalline glass of Example 1 of the present application.

[0146] FIG. 11 is the XRD comparison pattern of the microcrystalline glass of Example 1 of the present application before and after chemical strengthening, wherein A0 is the XRD pattern of the microcrystalline glass before chemical strengthening, and A1 is the XRD pattern of the chemically strengthened microcrystalline glass obtained after chemical strengthening.

[0147] FIG. 12 is the XRD comparison pattern of the microcrystalline glass of Comparative Example 5 of the present application before and after chemical strengthening, wherein B0 is the XRD pattern of the microcrystalline glass before chemical strengthening, and B1 is the XRD pattern of the chemically strengthened microcrystalline glass obtained after chemical strengthening.

[0148] FIG. 13 is the stress distribution diagram of the chemically strengthened microcrystalline glass of Example 15 of the present application tested by SLP-2000.

[0149] FIG. 14 is the stress distribution diagram of the chemically strengthened microcrystalline glass of Comparative Example 8 of the present application tested by SLP-2000.

[0150] FIG. 15 is a schematic diagram of the front side structure of the electronic device mentioned in the embodiment of the present application.

[0151] FIG. 16 is a schematic diagram of the back side structure of the electronic device mentioned in the embodiment of the present application.

[0152] FIG. 17 is a schematic diagram of the structure of the electronic device mentioned in the embodiment of the present application.

[0153] FIG. 18 is a schematic diagram of the structure of the electronic device mentioned in the embodiment of the present application.

[0154] FIG. 19 is a schematic diagram of the structure of the chemically strengthened microcrystalline glass of the present application, wherein d is the depth of the compressive stress layer, 21 is the compressive stress layer, and 22 is the tensile stress layer.

[0155] Reference signs: 1 - housing; 11 - display screen cover plate; 12 - back cover; 13 - camera protection cover plate; 2 - camera assembly; 3 - middle frame; 4 - display module. DETAILED DESCRIPTION

[0156] The embodiments of the present application will be described in detail below with examples, but those skilled in the art will understand that the following examples are only used to illustrate the present application, and should not be regarded as limiting the scope of the present application. The specific conditions are not specified in the examples, and the conventional conditions or the conditions recommended by the manufacturer are used. The reagents or instruments used are not specified by the manufacturer, and are conventional products that can be obtained by market purchase.

[0157] The endpoints of the ranges and any values disclosed herein are not limited to the precise values stated. The endpoints of the ranges and the values are approximate values and should be understood as including values approximately near these ranges and values within these ranges. For ranges of values, the endpoints of the ranges are combined with the individual points to form new ranges. These new ranges are to be considered as disclosed herein. The terms "optionally", "optional" or similar terms mean that the following description can include, or can not include (or can have, or can not have). The term "and / or" herein is inclusive, for example, "A and / or B" means only A, or only B, or both A and B.

[0158] Terminology and test methods:

[0159] In the present application, the "surface cracking" phenomenon refers to the phenomenon that the surface of the chemically strengthened glass (such as chemically strengthened microcrystalline glass) shows obvious cracks / cracks under strong light irradiation. The depth of the micro-cracks / cracks is several microns to tens of microns, and does not penetrate the entire thickness of the glass.

[0160] In the present application, the microcrystalline glass is a solid composite material containing both glass phase and crystal phase (or also known as microcrystalline phase, crystalline phase). The microcrystalline glass is also called glass ceramic or crystallized glass or crystalline glass.

[0161] In the present application, the chemically strengthened microcrystalline glass refers to a solid composite material obtained by chemically strengthening the microcrystalline glass. It should be understood that when the chemical strengthening treatment is performed, the alkali metal ions with large ionic radius (such as potassium ions or sodium ions) in the molten salt bath (or also known as molten salt bath) will replace the alkali metal ions with small ionic radius (such as sodium ions or lithium ions) in the microcrystalline glass, thereby generating an exchange ion volume difference and generating a compressive stress (or also known as compression stress) on the surface of the microcrystalline glass.

[0162] In the present application, the base glass (or also known as base glass) refers to the glass that has not been subjected to nucleation treatment, crystallization treatment and strengthening treatment.

[0163] In the present application, nucleation treatment refers to growing crystal nucleus in the base material glass through heat treatment; crystallization treatment refers to precipitating target crystal or crystal phase in the base material glass through heat treatment.

[0164] In the present application, the composition at the center of the chemically strengthened microcrystalline glass refers to the composition at or near the center of the depth or thickness of the chemically strengthened microcrystalline glass, that is, the composition of the region of the chemically strengthened microcrystalline glass which has not been ion exchanged. It should be understood that 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 which has not been subjected to chemical strengthening treatment.

[0165] In the present application, the visible light wavelength range refers to 360nm-740nm.

[0166] In the present application, the main crystal phase (or also referred to as the primary crystal phase) refers to a crystal phase having a higher mass content (or also referred to as weight percentage, mass percentage) than other crystal phases present in the microcrystalline glass or the chemically strengthened microcrystalline glass.

[0167] In the present application, the main surface refers to the surface with the largest surface area, such as the upper surface or the lower surface of a horizontally placed microcrystalline glass sheet.

[0168] In the present application, the crystallinity refers to the percentage of the total mass of the crystal phase in the microcrystalline glass or the chemically strengthened microcrystalline glass to the mass of the microcrystalline glass or the chemically strengthened microcrystalline glass, or also referred to as the total content of the crystal phase in the microcrystalline glass or the chemically strengthened microcrystalline glass.

[0169] In the present application, when light of a certain wavelength is irradiated onto the main surface of the microcrystalline glass or the chemically strengthened microcrystalline glass, the light will undergo reflection, absorption and transmission, and the ratio of the intensity of the transmitted portion to the intensity of the incident light is the transmittance.

[0170] In the present application, the refractive index refers to the ratio of the propagation speed of light in vacuum to the propagation speed of light in the medium.

[0171] In the present application, the crystallized glass raw material refers to a glass raw material which, after a period of heat treatment, has reached a certain crystallinity but has not yet reached the target crystallinity, and can continue to crystallize to reach the target crystallinity under heating.

[0172] In the present application, CT_LD refers to the tensile stress linear density, with the unit of MPa / mm. In the present application, CT_LD is calculated by the following formula:

[0173] Wherein, T is the thickness of the chemically strengthened glass-ceramics, in mm; DOL_0 is the depth of the compressive stress layer of the chemically strengthened glass-ceramics, in μm; |CT_AV| is the absolute value of the average tensile stress of the chemically strengthened glass-ceramics, in MPa. It should be understood that the data is substituted into the formula of the tensile stress line density according to the above unit requirements, and the calculation result is obtained, and the unit does not participate in the calculation.

[0174] It should be understood that after the glass-ceramics is placed in the molten salt bath for ion exchange, a compressive stress layer (or also referred to as a compressive stress layer) is formed on the surface of the glass-ceramics, and a tensile stress layer (or also referred to as a tensile stress layer) is formed inside the glass-ceramics. Exemplarily, during the chemical strengthening treatment, the alkali metal ions with large radius in the molten salt bath are ion exchanged with the alkali metal ions with small radius 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, the glass-ceramics after the chemical strengthening treatment is prepared to obtain a chemically strengthened glass-ceramics comprising a compressive stress layer and a tensile stress layer.

[0175] In the present application, CS_50 refers to the compressive stress value at a depth of 50 μm from the main surface of the chemically strengthened glass-ceramics, in MPa, which is obtained by testing with an SLP-2000 stress meter (or also referred to as a scattered light photoelastic stress meter).

[0176] In the present application, |CT_AV| refers to the absolute value of the average tensile stress, in MPa, specifically the absolute value of the average of all tensile stresses in the tensile stress layer, which is obtained by testing with an SLP-2000 stress meter.

[0177] In the present application, DOL_0 refers to the depth of the compressive stress layer, or the depth of the compressive stress layer, specifically the distance from any main surface of the chemically strengthened glass-ceramics to the position close to the surface where the compressive stress is zero, which is obtained by testing with an SLP-2000 stress meter.

[0178] In the present application, the testing method of the aforementioned stress performance is as follows: the SLP-2000 stress meter is used for testing, the wavelength of the light source 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 usec. When testing the stress performance of the chemically strengthened glass-ceramics, a conductive liquid is first dropped on the stress meter, and then the chemically strengthened glass-ceramics sample to be tested is wiped clean and placed on the test channel to test its stress value. The stress meter is SLP-2000 and the conductive liquid used is a conductive liquid with a refractive index of 1.51. Then, the tensile stress line density (CT_LD) value of the chemically strengthened glass-ceramics is calculated by the aforementioned formula of the tensile stress line density; the stress data of the chemically strengthened glass-ceramics measured by the SLP-2000 is used to calculate the depth of the compressive stress layer (DOL_0) of the chemically strengthened glass-ceramics. The value of b is tested according to the reference of FIG. 7 and FIG. 8.

[0179] In the present application, the value of b is used to represent the yellow-blue value of the material. The value of b in the present application is the transmitted light b value, and the positive value of b indicates that the material is blue.

[0180] In the present application, the upper limit of crystallization temperature refers to the highest temperature at which the base glass produces crystals, and above this temperature, the base glass will not produce crystals.

[0181] In the present application, the thickness is tested by a micrometer. It should be understood that in the thickness direction of the glass-ceramic sample, the degree of ion exchange changes gradually from the surface to the center, and the total Na-K and / or Li-Na exchange amount increment (mass) generally does not exceed 1.5% of the total mass of the sample, so the expansion effect in the thickness direction is extremely slight, and the thickness can be approximately considered to be substantially unchanged. That is, the thickness of the glass-ceramic changes very little before and after chemical strengthening, and can be substantially ignored, and the thickness of the glass-ceramic is substantially the same as the thickness of the chemically strengthened glass-ceramic prepared therefrom.

[0182] In the present application, the size specifications of the glass-ceramic sheet are tested by a two-dimensional measuring machine (instrument model Miyu MY-YXCL-4030).

[0183] In the present application, the Young's modulus is used to represent the ability of the glass to resist elastic deformation under the action of external force. In the present application, the UMS-100 ultrasonic material characterization system is used to test the Young's modulus of the glass-ceramic by acoustic waves.

[0184] In the present application, the crystalline phase, crystallinity, and average grain size of the glass-ceramic or chemically strengthened glass-ceramic are confirmed by XRD testing. Specifically:

[0185] (1) XRD testing: The glass-ceramic or chemically strengthened glass-ceramic of the present application is crushed and ground into a sample with a particle size of less than 75 μm, and the ground sample is tested by an X-ray diffractometer to obtain an XRD diffraction peak curve and XRD diffraction data. The X-ray diffractometer used in the present application is Shimadzu XRD-6100, the target material is copper, 2θ = 10°-50°, the scanning speed is 0.2° / min, the working voltage is 40 kV, and the working current is 30 mA.

[0186] (2) Determination of crystalline phase: The XRD diffraction data are analyzed by Jade software (JADE Standard 8.6) to determine the crystalline phase in the sample.

[0187] (3) Determination of crystallinity (or also referred to as total content of crystalline phase): The test results of XRD (RAW format) are imported into Jade software for fitting and calculation, and the crystallinity of the sample can be determined. Specifically, the ratio of the peak area of the fitted crystalline phase to the total peak area of the fitting is recorded as the crystallinity of the sample.

[0188] (4) Determination of average grain size (or also referred to as average crystal size): The average grain size of the sample can be calculated according to the Scherrer formula D = Kλ / (βcosθ) using the result data obtained by XRD test. Wherein, λ is the X-ray wavelength, λ = 0.154056 nm, β is the half-height width of the diffraction peak, K = 0.89, and θ is the Bragg diffraction angle. Specifically, the RAW format file output by the XRD instrument is curve-fitted in Jade software, and the fitting report is output by Jade. According to the angle 2θ value and the Peak FWHM value corresponding to each diffraction peak in the fitting report, the Peak FWHM value is converted to radian system: β = (FWHM / 180x3.14), and the grain size of each diffraction peak is calculated by the Scherrer formula D = Kλ / (βcosθ) and then averaged to obtain the average grain size in the sample.

[0189] In the present application, the transmittance and b value of the microcrystalline glass are tested by using a haze meter according to the national standard GB / T 7962.12-2010 Optical Glass-Determination of Spectral Transmittance. Specifically, the transmittance and b value of light of different wavelengths of 5 pieces of microcrystalline glass in the same batch are tested by using a haze meter. The average of the b values measured from the 5 pieces of microcrystalline glass is taken as the b value result of the microcrystalline glass. The average of the transmittance at 550 nm wavelength light measured from the 5 pieces of microcrystalline glass is taken as the transmittance result of the microcrystalline glass at 550 nm wavelength light. The haze meter used in the present application is a Konica Minolta Spectrophotometer CM-3600A from Japan, the light receiving optical system is transmission, the spectral method is plane diffraction grating, the wavelength range is 360 nm-740 nm, the wavelength interval is 10 nm, the illumination light source is pulse xenon lamp x 4, and the instrument is placed in an environment with a temperature of 24°C and an air humidity of 40%.

[0190] In the present application, the transmittance curve of the microcrystalline glass or the chemically strengthened microcrystalline glass at the wavelength of visible light is also tested by using a UV-2600 ultraviolet visible spectrophotometer from Shimadzu.

[0191] Density test: In the present application, the density of the microcrystalline glass is tested by using an electronic density balance SD-200L from Japan ALFA MIRAGE.

[0192] Refractive index test: In the present application, the refractive index of the microcrystalline glass is tested by using an Abbe refractometer WYA-2WAJ from Li Chenbangxi Instrument Technology in Shanghai, China.

[0193] Thermal expansion softening point test: the sample is made into a cylinder with a diameter of 5.5 mm and a length of 20 mm, and the sample is tested using a thermal dilatometer LINSEIS L75VD1000, and the thermal expansion test curve is output. The temperature corresponding to the peak position of the curve is the thermal expansion softening point temperature of the sample.

[0194] Crystallization upper limit temperature test: the substrate glass is knocked into small pieces, then put into a long quartz tank and fully covered. The gradient furnace with model number JKZC-XJY01 is set to a temperature interval, such as 1050℃-1225℃, and at least 6 temperature points are taken from high to low in each temperature interval. After the gradient furnace reaches the preset temperature interval, the long quartz tank with the sample is placed in the gradient furnace, so that the 6 temperature points correspond to the glass samples at 6 positions in the long quartz tank. After the long quartz tank is placed in the gradient furnace for constant temperature for 60-70 min, the long quartz tank is taken out. The glass samples at different positions in the long quartz tank are observed with a microscope or magnifying glass. If the glass sample appears to be devitrified or foggy, it is determined that the glass sample is crystallized. If the glass sample is completely transparent, it is determined that the glass sample is not crystallized. The crystallization upper limit temperature range is between the temperature point corresponding to the completely transparent sample and the temperature point corresponding to the adjacent devitrified or foggy sample, and the average of the two temperature points is taken as the crystallization upper limit temperature. If all the glass samples in the long quartz tank are crystallized or not crystallized within the temperature interval set by the gradient furnace, the temperature interval of the gradient furnace is reset, and the crystallization upper limit temperature of the glass sample is determined.

[0195] In this application, M(K2O) is the mass percentage of K2O on the surface of the chemically strengthened microcrystalline glass. M(Na2O) is the mass percentage of Na2O on the surface of the chemically strengthened microcrystalline glass.

[0196] Test method of M(K2O): the content of K element on the surface of the chemically strengthened microcrystalline glass is measured by X-ray fluorescence spectrometer (XRF), and then the mass percentage of K2O on the surface is calculated. The calculation method is: mass percentage of K2O on the surface=(content of K element on the surface x relative molecular mass of K2O) / (relative atomic mass of K element x 2). It should be understood that the content of K element on the surface=mass of K element / total mass of elements, and the total mass of elements=total mass of oxides. The equipment model number of the X-ray fluorescence spectrometer (XRF) used is Thermo Scientific ARL PERFORM’X, the target material is Rh (rhodium), the light tube voltage is 40 kV, the current is 60 mA, the collimator is 0.15, the crystal is selected as LiF200, the detector is selected as FPC, and the test range is a circle with a diameter of 29 mm. The test method adopts X_UQ method in OXSAS analysis software.

[0197] Test method of M(Na2O): The content of Na element on the surface of the chemically strengthened glass ceramic is measured by X-ray fluorescence spectrometer (XRF), and then the mass percentage of Na2O on the surface is calculated. The calculation method is: the mass percentage of Na2O on the surface = (the content of Na element on the surface × the relative molecular mass of Na2O) / (the relative atomic mass of Na element × 2). It should be understood that the content of Na element on the surface = the mass of Na element / the total mass of elements, and the total mass of elements = the total mass of oxides. The model of the X-ray fluorescence spectrometer (XRF) used is Thermo Scientific ARL PERFORM’X, the target is Rh (rhodium), the light tube voltage is 30 kV, the current is 80 mA, the collimator is 0.40, the crystal selection is AxO3, the detector selection is FPC, and the test range is a circle with a diameter of 29 mm. The test method uses the X_UQ method in the OXSAS analysis software.

[0198] In this application, the XRF instrument test uses a non-standard test, and the concentration of elements or oxides with atomic number 6 and below in the chemically strengthened glass ceramic is not tested. The mass percentage of K2O on the surface of the chemically strengthened glass ceramic = the mass of K2O / the total mass of oxides, and the mass percentage of Na2O on the surface of the chemically strengthened glass ceramic = the mass of Na2O / the total mass of oxides, wherein the oxides include SiO2, Al2O3, ZrO2, Na2O, K2O, P2O5, and other oxides that can be accurately tested by XRF, and do not include the content of B2O3, Li2O, and other oxides that cannot be accurately tested by XRF.

[0199] In this application, M’(K2O) is the mass percentage of K2O on the surface of the thinned chemically strengthened glass ceramic obtained after each of the two main surfaces of the chemically strengthened glass ceramic is thinned by 3 μm. M’(Na2O) is the mass percentage of Na2O on the surface of the thinned chemically strengthened glass ceramic obtained after each of the two main surfaces of the chemically strengthened glass ceramic is thinned by 3 μm. The test method of M’(K2O) and M’(Na2O) is described in the test method of M(K2O) and M(Na2O).

[0200] Average sandpaper drop height test: In this application, the average sandpaper drop height of the chemically strengthened glass ceramic is obtained by adding the sandpaper drop height of each sample measured in the same embodiment or the same comparative example and dividing the sum by the number of samples. The average sandpaper drop height of the chemically strengthened glass ceramic is used to represent the drop damage resistance of the chemically strengthened glass ceramic. The drop damage resistance is tested by using uniform sandpaper, which can simulate the application scenario of the chemically strengthened glass ceramic falling onto a ground with uniform roughness.

[0201] Specifically, at least 10 samples are taken from each batch for testing, and the average sandpaper drop height

[0202] Wherein, n is the number of glass samples tested per batch, hi is the sandpaper drop height of a single sample test.

[0203] Wherein, the test method of the sandpaper drop height of a single sample is as follows:

[0204] Step 1: Paste 80-mesh sandpaper on the lower surface of a model machine, and place the model machine on a green chart LT-SKDL-CD type drop machine.

[0205] Step 2: Place the chemical strengthened microcrystalline glass sample to be tested directly below the model machine, with the chemical strengthened microcrystalline glass sample facing the sandpaper, specifically with the main surface of the chemical strengthened microcrystalline glass facing the sandpaper. The model machine is allowed to impact and fall at a certain drop height, impacting the chemical strengthened microcrystalline glass sample directly below the model machine. If the chemical strengthened microcrystalline glass sample does not break, the drop height of the model machine is increased in a certain manner, and the model machine is allowed to continue to impact and fall, impacting the chemical strengthened microcrystalline glass sample directly below the model machine, until the chemical strengthened microcrystalline glass sample breaks. For example, the drop height of the model machine is started at 0.4 m, and the sample is subjected to a drop impact. If the sample does not break, the drop height of the model machine is increased by 0.1 m, and the sample is subjected to another drop impact. The above process is repeated until the chemical strengthened microcrystalline glass sample breaks.

[0206] Step 3: The last drop height before the chemical strengthened microcrystalline glass sample breaks is recorded as the sandpaper drop height resistance of the sample. For example, if the drop height is increased by 0.1 m each time, and the sample breaks when the drop height is 0.5 m, then the sandpaper drop height resistance of the sample is 0.4 m.

[0207] t 强化 In the embodiments of the present application, the microcrystalline glass sample to be strengthened is placed in a corresponding salt bath environment for chemical strengthening. During the strengthening process, the microcrystalline glass sample is taken out every certain period of time, and the |CT AV|, DOL 0, and T of the microcrystalline glass sample are tested by SLP-2000. Then, the CT LD value at this moment is calculated by the formula

[0208] When the CT LD value reaches the maximum value, the required strengthening time is t 强化 After the microcrystalline glass is placed in the corresponding salt bath environment for strengthening for t 强化 time, the stress data of the prepared chemical strengthened glass is obtained.

[0209] Relationship A: In the present application, the relationship A is a stress characteristic value of the prepared chemical strengthening glass-ceramic sample after being strengthened in the corresponding salt bath environment for a period of time, which is the ratio of the stress integral of the compressive stress layer of the main surface of the prepared chemical strengthening glass-ceramic sample to the DOL_0 along the thickness direction and the DOL_0. In the embodiments, the glass-ceramic base sample to be strengthened is placed in the corresponding salt bath environment for chemical strengthening t 强化 After a period of time, the prepared chemical strengthening glass-ceramic sample is taken out, and the corresponding stress curve and DOL_0 stress data are obtained by SLP-2000 test. The A value of the chemical strengthening glass-ceramic sample in the corresponding salt bath environment can be obtained by integrating and calculating the stress curve.

[0210] |K 0.5×DOL_0 | The tangent line at the depth t = 0.5 x DOL_0 from the main surface of the chemical strengthening glass-ceramic is drawn on the stress curve measured by SLP-2000, and the absolute value of the slope of the tangent line is calculated.

[0211] Without being limited by any theory, for the glass-ceramic with high lithium content and lithium disilicate as the main crystal phase, when the chemical strengthening treatment is carried out in the molten salt bath, especially in the high-temperature molten salt bath, a large number of irregular cracks / crevices are easily generated on the surface of the prepared chemical strengthening glass-ceramic, which exist on the surface of the chemical strengthening glass-ceramic, please refer to FIG. 2 and FIG. 4, and the depth is between 10 μm and 100 μm, hereinafter referred to as "surface cracking". The "surface cracking" problem of the chemical strengthening glass-ceramic will cause the drop damage resistance and mechanical strength of the chemical strengthening glass-ceramic to be greatly reduced, and more seriously, even cause the surface of the chemical strengthening glass-ceramic to directly fail due to too many cracks / crevices, and cannot be used.

[0212] Without being limited by any theory, the inventors found that if the surface compressive stress generated during the chemical strengthening process of the glass-ceramic is too concentrated and the internal tensile stress is relatively dispersed, the stress difference between the inside and outside of the substrate will be too large, the surface with too concentrated stress will appear "bursting" phenomenon, causing "surface cracking", and finally causing the prepared chemical strengthening glass-ceramic to have the problem of "surface cracking".

[0213] Without being limited by any theory, the inventors found that, when the glass-ceramics with high lithium content and lithium disilicate as the main crystalline phase are subjected to chemical strengthening treatment to prepare the chemically strengthened glass-ceramics with desired properties, the matching relationship between the glass composition and the stress distribution structure is very important. If the two are not matched, the problem of "surface cracking" of the prepared chemically strengthened glass-ceramics is prone to occur, resulting in a significant reduction in the mechanical strength performance of the chemically strengthened glass-ceramics. When the glass-ceramics with a specific composition are matched to a suitable and optimal stress distribution structure, not only can the problem of "surface cracking" of the prepared chemically strengthened glass-ceramics be overcome, but also the chemically strengthened glass-ceramics with high mechanical strength performance can be ensured.

[0214] When the glass-ceramics with high lithium content and lithium disilicate as the main crystalline phase are subjected to chemical strengthening treatment, the matching relationship between the glass composition and the chemical strengthening process is very important. If the matching relationship is poor, a more suitable stress distribution structure cannot be obtained, and a chemically strengthened glass-ceramic with desired properties cannot be obtained.

[0215] In the present application, in order to improve the problem of "surface cracking" of the glass-ceramics with high lithium content and lithium disilicate as the main crystalline phase after chemical strengthening treatment, a chemically strengthened glass-ceramic with high lithium content, lithium disilicate as the main crystalline phase, and specific composition and specific stress distribution structure is provided. The chemically strengthened glass-ceramic not only does not have the problem of "surface cracking", but also has high mechanical strength performance.

[0216] As described above, in some embodiments of the present application, a chemically strengthened glass-ceramic is provided. The main crystalline phase of the chemically strengthened glass-ceramic is lithium disilicate crystalline phase. The crystallinity of the chemically strengthened glass-ceramic is not less than 65%. The content of Li2O at the center of the chemically strengthened glass-ceramic is not less than 11% in terms of mass percentage of oxide.

[0217] The surface of the chemically strengthened glass-ceramic has a compressive stress layer, and has a tensile stress layer inside. The chemically strengthened glass-ceramic satisfies the following relationship:

[0218] B = A - 83989 x n(ZrO2) 2 + 2526.5 x n(ZrO2), 130≤B≤180, preferably 135≤B≤180, more preferably 135≤B≤175;

[0219] wherein t is the depth from the main surface of the chemically strengthened glass-ceramic, CS(t) is the compressive stress value at the depth t, is the stress integral of the compressive stress layer from the main surface of the chemically strengthened glass-ceramic to DOL_0, with the unit of MPa·μm;

[0220] DOL_0 is the depth of compressive stress layer, in units of pm;

[0221] In the relationship formula A, the data is substituted into the calculation according to the above unit requirements, and the calculation result is obtained, and the unit does not participate in the calculation;

[0222] n(ZrO2) is the mole percentage content of ZrO2 in the center of the chemical strengthening glass ceramic;

[0223] In the relationship formula B, the numerical value of the relationship formula A and the mole percentage content numerical value of ZrO2 are substituted into the calculation, and the calculation result is obtained, and the unit does not participate in the calculation.

[0224] The present application can effectively overcome the problem of "surface cracking" of the prepared chemical strengthening glass ceramic by making high lithium content glass ceramic with specific composition and lithium disilicate as the main crystal phase after chemical strengthening treatment, meeting the specific stress characteristics, especially making the mole percentage content of ZrO2 in the glass ceramic and the stress characteristic relationship formula A meet the specific requirements (i.e. meet the range requirements of the aforementioned relationship formula B), not only can effectively overcome the problem of "surface cracking" of the prepared chemical strengthening glass ceramic, but also can ensure that the chemical strengthening glass ceramic has high mechanical strength performance, and further can ensure that the chemical strengthening glass ceramic has excellent damage resistance.

[0225] When the value of relationship formula B exceeds the upper limit value, the prepared chemical strengthening glass ceramic will have the phenomenon of "surface cracking"; and when the value of relationship formula B is lower than the lower limit value, the prepared chemical strengthening glass ceramic cannot obtain ideal stress effect, and the stress level is low, and the mechanical performance and strength performance are poor.

[0226] In some embodiments, the value of relationship formula B can be: 130.00, 135.00, 140.00, 145.00, 150.00, 155.00, 160.00, 165.00, 170.00, 175.00, 180.00, 144.41, 149.14, 151.82, 157.96, 159.24, 161.80, 166.00, 148.99, 165.83, 168.65, 170.67, 163.85, 155.53, 136.18, 155.43, 172.09, 147.01, 147.17, 165.17, 164.24 or 166.69, or can be a value within the numerical range formed by any two of the above specific numerical values as endpoints, as long as the chemical strengthening glass ceramic with the required performance of the present 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 chemical strengthening glass ceramic with the required performance of the present application can be obtained.

[0227] In some embodiments of the present application, the value of the relationship A satisfies: 120≤A≤250, preferably, 130≤A≤240, more preferably, 130≤A≤235. By making the chemically strengthened glass-ceramics satisfy the relationship A, it is conducive to make the chemically strengthened glass-ceramics obtain a desired high stress level, and thus conducive to ensure that the chemically strengthened glass-ceramics has high mechanical strength performance.

[0228] In some embodiments, the value of the relationship A can be: 120.00, 125.00, 130.00, 135.00, 140.00, 145.00, 150.00, 155.00, 160.00, 165.00, 170.00, 175.00, 180.00, 185.00, 190.00, 195.00, 200.00, 205.00, 210.00, 215.00, 220.00, 225.00, 230.00, 235.00, 240.00, 245.00, 250.00, 150.39, 155.13, 157.80, 163.95, 165.23, 167.78, 171.98, 130.02, 148.08, 153.52, 157.87, 150.70, 161.51, 200.59, 217.59, 234.24, 208.06, 207.14, 220.07, 224.21 or 226.66, or can be a value within a value range with any two of the above specific values as end points, as long as a chemically strengthened glass-ceramics with the required performance of the present 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 a chemically strengthened glass-ceramics with the required performance of the present application can be obtained.

[0229] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfies the following relationship: C=A-|CT_AV|, 30≤C≤90, preferably, 30≤C≤85, more preferably, 30≤C≤80, wherein |CT_AV| is the absolute value of the average tensile stress, in MPa. By making the chemically strengthened glass-ceramics satisfy the relationship C, it is conducive to overcome the problem of "surface cracking" of the prepared chemically strengthened glass-ceramics, and conducive to ensure that the chemically strengthened glass-ceramics has high mechanical strength performance. When the value of the relationship C exceeds the upper limit value, it is not conducive to solve the problem of "surface cracking" of the prepared chemically strengthened glass-ceramics; and when the value of the relationship C is lower than the lower limit value, it is not conducive to make the prepared chemically strengthened glass-ceramics obtain an ideal stress effect, and the stress level is low, and the mechanical performance and strength performance are poor.

[0230] In some embodiments, the value of the relationship C can be: 30.00, 35.00, 40.00, 45.00, 50.00, 55.00, 60.00, 65.00, 70.00, 75.00, 80.00, 85.00, 90.00, 33.97, 40.28, 37.3, 41.41, 47.67, 42.93, 45.51, 45.77, 52.74, 53.28, 51.42, 52.28, 37.27, 64.74, 70.95, 77.45, 57.85, 52.49, 67.32, 66.26, or 64.31, or a value within a range defined by any two of the above specific values as endpoints, as long as a chemically strengthened glass-ceramic with desired properties of the present 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 a chemically strengthened glass-ceramic with desired properties of the present application is obtained.

[0231] In some embodiments of the present application, the chemically strengthened glass-ceramic satisfies the following relationship: 2≤|K 0.5×DOL_0 |≤6, preferably 2.5≤|K 0.5×DOL_0 |≤5.5, more preferably 3≤|K 0.5×DOL_0 |≤5, wherein |K 0.5×DOL_0 |is the absolute value of the slope of the stress curve at a depth t = 0.5 x DOL_0 from the main surface of the chemically strengthened glass-ceramic. By having the chemically strengthened glass-ceramic satisfy the above relationship, it is helpful to overcome the problem of "surface cracking" of the chemically strengthened glass-ceramic produced, and to ensure that the chemically strengthened glass-ceramic has high mechanical strength properties. When the value of |K 0.5×DOL_0 |exceeds the upper limit value, it is not conducive to solving the problem of "surface cracking" of the chemically strengthened glass-ceramic produced; and when the value of |K 0.5×DOL_0 |is below the lower limit value, it is not conducive to making the chemically strengthened glass-ceramic produced to obtain the desired stress effect, with a low stress level, poor mechanical properties and strength properties.

[0232] In some embodiments, the relationship |K 0.5×DOL_0The value of | can be 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 3.088, 3.154, 3.105, 3.241, 3.085, 3.208, 3.309, 2.958, 3.224, 3.647, 3.057, 3.464, 3.354, 4.587, 4.244, 4.216, 4.485, 4.454, or 4.324, or can be a value within a range between any two of the foregoing specific values as endpoints, as long as the chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It should be understood that in specific embodiments, any of the foregoing ranges can be combined with any other range, as long as the chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0233] In some embodiments of the present application, the chemically strengthened glass-ceramic satisfies 0≤M(K2O)≤1.5%, 5%≤M(Na2O)≤25%; M(K2O) is the mass percentage of K2O on the surface of the chemically strengthened glass-ceramic, and M(Na2O) is the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic.

[0234] In some embodiments, M(K2O) can be 0, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, or 1.5%, or can be a value within a range between any two of the foregoing specific values as endpoints, as long as the chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It should be understood that in specific embodiments, any of the foregoing ranges can be combined with any other range, as long as the chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0235] In some embodiments, M(Na2O) can be 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, 20.5%, 21%, 21.5%, 22%, 22.5%, 23%, 23.5%, 24%, 24.5%, or 25%, or can be a value within a range between any two of the foregoing specific values as endpoints, as long as the chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It should be understood that in specific embodiments, any of the foregoing ranges can be combined with any other range, as long as the chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0236] In some embodiments of the present application, after the two main surfaces of the chemically strengthened glass ceramic are each thinned by 3 μιη in thickness, the thinned chemically strengthened glass ceramic satisfies: the mass percentage of K2O on the surface of the chemically strengthened glass ceramic M'(K2O) and the mass percentage of Na2O on the surface of the chemically strengthened glass ceramic M'(Na2O) are: 0≤M'(K2O)≤0.5%, 4.0%≤M'(Na2O)≤20%.

[0237] In some embodiments, M'(K2O) can be 0, 0.1%, 0.2%, 0.3%, 0.4%, or 0.5%, or can be a value within a range defined by any two of the above specific values as endpoints, as long as a chemically strengthened glass ceramic with the desired properties of the present 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 a chemically strengthened glass ceramic with the desired properties of the present application is obtained.

[0238] In some embodiments, M'(Na2O) can be 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, or 20%, or can be a value within a range defined by any two of the above specific values as endpoints, as long as a chemically strengthened glass ceramic with the desired properties of the present 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 a chemically strengthened glass ceramic with the desired properties of the present application is obtained.

[0239] It should be understood that the chemically strengthened glass ceramic of the present application is made from a glass ceramic that is chemically strengthened, and the mass percentages of Na2O and K2O on the surface of the chemically strengthened glass ceramic are different from the mass percentages of Na2O and K2O on the surface of the chemically strengthened glass ceramic after the two main surfaces of the chemically strengthened glass ceramic are each thinned by 3 μιη in thickness. This is because, during the chemical strengthening process, ion exchange occurs in the glass ceramic (for example, Li + or Na + is replaced by a larger alkali metal ion (for example, Na + or K + ), and the surface layer of the glass ceramic is directly in contact with the salt bath, and is less hindered by the glass matrix, so the exchange rate of the surface layer is greater, forcing the larger alkali metal ion (for example, Na + or K+ )more easily, but as ion exchange proceeds, the ions inside the glass undergo ion exchange, the higher the resistance of the glass matrix, the more difficult it is to proceed, so compared to the chemically strengthened glass ceramic, the mass percentage of Na2O and K2O on the surface of the chemically strengthened glass ceramic after the two main surfaces of the chemically strengthened glass ceramic are each thinned by 3 μm along the thickness direction is higher than the mass percentage of Na2O and K2O on the surface of the chemically strengthened glass ceramic which is not thinned.

[0240] In some embodiments of the present application, the chemically strengthened glass ceramic satisfies: 0.20≤DOL_0 / T≤0.25, preferably, 0.21≤DOL_0 / T≤0.23, wherein DOL_0 is the depth of compressive stress layer, and T is the thickness of the chemically strengthened glass ceramic. By satisfying the appropriate proportional relationship between the depth of compressive stress layer and the thickness of the chemically strengthened glass ceramic, it is beneficial to ensure that the chemically strengthened glass ceramic is in a relatively optimal stress distribution state, and thus it is beneficial to exert the improvement effect of the stress structure on the mechanical strength performance.

[0241] 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 0.20, 0.21, 0.22, 0.23, 0.24 or 0.25, or can be a value within the numerical range constituted by any two of the above specific numerical values as endpoints, as long as a chemically strengthened glass ceramic with the required performance of the present 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 a chemically strengthened glass ceramic with the required performance of the present application can be obtained.

[0242] In some embodiments of the present application, the chemically strengthened glass ceramic satisfies: 90 μm≤DOL_0≤160 μm, preferably, 100.00 μm≤DOL_0≤160.00 μm, wherein DOL_0 is the depth of compressive stress layer. By having the chemically strengthened glass ceramic have an appropriate DOL_0, it is more beneficial to increase the energy of the chemically strengthened glass ceramic to offset the energy driving crack propagation, and thus to ensure that the chemically strengthened glass ceramic has excellent damage resistance, such as excellent drop damage resistance, when a blunt or sharp object impacts or penetrates, and the sudden crack directly penetrates the compressive stress region to reach the tensile stress region, causing the chemically strengthened glass ceramic to shatter.

[0243] In some embodiments, the DOL_0 of the chemically strengthened glass ceramic can be 100.00 pm, 105.00 pm, 110.00 pm, 115.00 pm, 120 pm, 130 pm, 140 pm, 150 pm, 160 pm, 110.54 pm, 109.75 pm, 111.42 pm, 110.75 pm, 114.2 pm, 111.9 pm, 113.24 pm, 105.74 pm, 107.56 pm, 107.96 pm, 110.78 pm, 108.98 pm, 109.87 pm, 107.04 pm, 107.62 pm, 109.78 pm, 110.42 pm, 112.85 pm, 106.99 pm, 107.67 pm, or 110.42 pm, or can be a value within a range between any two of the above specifically stated values, as long as a chemically strengthened glass ceramic with the desired properties of the present 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 a chemically strengthened glass ceramic with the desired properties of the present application is obtained.

[0244] The thickness T of the chemically strengthened glass ceramic of the present application is not particularly limited. For example, in some embodiments of the present application, the glass ceramic from which the chemically strengthened glass ceramic is prepared or the chemically strengthened glass ceramic is in the form of a plate, and optionally, the thickness T of the glass ceramic from which the chemically strengthened glass ceramic is prepared or 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 0.45-0.55 mm. Optionally, the thickness T of the chemically strengthened glass ceramic of the present 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 a range between any two of the above specifically stated values, as long as a chemically strengthened glass ceramic with the desired properties of the present 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 a chemically strengthened glass ceramic with the desired properties of the present application is obtained. At present, electronic devices tend to be light and thin, and it is believed that the smaller the thickness, the lighter the weight, and the more excellent the optical effect. The present application can make the chemically strengthened glass ceramic product as thin as possible while ensuring strength, so as to meet the light and thin requirements of electronic devices.

[0245] The present application is beneficial to obtain a chemically strengthened glass-ceramic product with high stress level by making the chemically strengthened glass-ceramic meet appropriate stress characteristics, and then beneficial to play the improvement effect of stress characteristics on mechanical strength performance, while ensuring that the chemically strengthened glass-ceramic has no "surface cracking" problem on the surface, and making the chemically strengthened glass-ceramic meet excellent damage resistance.

[0246] In some embodiments of the present application, the chemically strengthened glass-ceramic meets: 100 MPa≤CS_50≤300 MPa, preferably, 110 MPa≤CS_50≤250 MPa, more preferably, 110 MPa≤CS_50≤240 MPa, wherein CS_50 refers to the compressive stress value at a depth of 50 μm from the main surface of the chemically strengthened glass-ceramic.

[0247] In some embodiments, the CS_50 of the chemically strengthened glass-ceramic can be 100.00 MPa, 110.00 MPa, 120.00 MPa, 130.00 MPa, 140.00 MPa, 150.00 MPa, 160.00 MPa, 170.00 MPa, 180.00 MPa, 190.00 MPa, 200.00 MPa, 210.00 MPa, 220.00 MPa, 230.00 MPa, 240.00 MPa, 250.00 MPa, 260.00 MPa, 270.00 MPa, 280.00 MPa, 290.00 MPa, 300.00 MPa, 158.56 MPa, 168.85 MPa, 168.41 MPa, 180.27 MPa, 195.42 MPa, 170.2 MPa, 188.74 MPa, 113.52 MPa, 153.44 MPa, 143.55 MPa, 147.58 MPa, 153.89 MPa, 184.21 MPa, 207.1 MPa, 216.95 MPa, 246.54 MPa, 223.64 MPa, 229.67 MPa, 223.5 MPa, 239.75 MPa, or 244.85 MPa, or can be a value within a value range constituted by any two specific values as end points, as long as the chemically strengthened glass-ceramic with the required performance of the present 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 required performance of the present application can be obtained.

[0248] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfies: 80.00 MPa≤|CT_AV|≤200.00 MPa, preferably, 80.00 MPa≤|CT_AV|≤170.00 MPa, more preferably, 80.00 MPa≤|CT_AV|≤160.00 MPa, wherein |CT_AV| is the absolute value of the average tensile stress.

[0249] In some embodiments, the chemically strengthened glass-ceramics can have |CT_AV| of 80.00 MPa to 160.00 MPa, 100.00 MPa to 160.00 MPa, 100.00 MPa to 125.00 MPa, 105.00 MPa to 120.00 MPa, 100.00 MPa to 150.00 MPa, or 110.00 MPa to 115.00 MPa. In some embodiments, the chemically strengthened glass-ceramics can have |CT_AV| of 80 MPa, 85 MPa, 90 MPa, 100.00 MPa, 110.00 MPa, 120.00 MPa, 125.00 MPa, 130.00 MPa, 135.00 MPa, 140.00 MPa, 150.00 MPa, 160.00 MPa, 170.00 MPa, 180.00 MPa, 190.00 MPa, 200.00 MPa, 116.42 MPa, 114.85 MPa, 120.5 MPa, 122.54 MPa, 117.56 MPa, 124.85 MPa, 126.47 MPa, 84.25 MPa, 95.34 MPa, 100.24 MPa, 106.45 MPa, 98.42 MPa, 124.24 MPa, 135.85 MPa, 146.64 MPa, 156.79 MPa, 150.21 MPa, 154.65 MPa, 152.75 MPa, 157.95 MPa, or 162.35 MPa, or a value within a range defined by any two of the foregoing specific values as endpoints, as long as a chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It should be understood that in specific embodiments, any of the foregoing ranges can be combined with any other range, as long as a chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0250] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfy: 40000.00 MPa / mm≤CT_LD≤100000.00 MPa / mm, preferably, 47000.00 MPa / mm≤CT_LD≤95000.00 MPa / mm, wherein CT_LD refers to the tensile stress linear density. Controlling the CT_LD of the chemically strengthened glass-ceramics to be at a relatively large value, for example, not less than 40000 MPa / mm, is conducive to ensuring that the tensile stress stored inside the chemically strengthened glass-ceramics is sufficiently dense, and in turn, is conducive to ensuring that it has a relatively high surface stress level, and ensuring that it can obtain excellent damage resistance, such as excellent drop damage resistance, to meet market demand.

[0251] In some embodiments, the CT LD of the chemically strengthened glass-ceramics can be 55000 MPa / mm to 92000 MPa / mm, 58000 MPa / mm to 90000 MPa / mm, 56000 MPa / mm to 94000 MPa / mm, or 57000 MPa / mm to 93000 MPa / mm. In some embodiments, the CT LD of the chemically strengthened glass-ceramics can be 40000 MPa / mm, 45000 MPa / mm, 50000 MPa / mm, 55000 MPa / mm, 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, 95000 MPa / mm, 100000 MPa / mm, 64943.73 MPa / mm, 64430.85 MPa / mm, 66795.56 MPa / mm, 68254.78 MPa / mm, 63858.59 MPa / mm, 68967.14 MPa / mm, 69184.15 MPa / mm, 48615.62 MPa / mm, 54320.92 MPa / mm, 56952.36 MPa / mm, 59279.88 MPa / mm, 55516.75 MPa / mm, 69639 MPa / mm, 77684.46 MPa / mm, 83514.41 MPa / mm, 87940.38 MPa / mm, 83865.25 MPa / mm, 84840.99 MPa / mm, 87379.11 MPa / mm, 89924.09 MPa / mm, or 90643.25 MPa / mm, or a value within a range defined by any two of the specifically named values as endpoints, as long as a chemically strengthened glass-ceramics with the desired properties of the present 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 a chemically strengthened glass-ceramics with the desired properties of the present application is obtained.

[0252] It should be understood that the chemically strengthened glass-ceramics of the present application is made from a glass-ceramic which is subjected to a chemical strengthening treatment. The composition at the center of the chemically strengthened glass-ceramics is the same or substantially the same as that of the glass-ceramic. Compared to the glass-ceramic before the chemical strengthening treatment, the composition at the surface of the glass-ceramic article after the chemical strengthening treatment can be different from that of the glass-ceramic before the chemical strengthening treatment. This is because, during the chemical strengthening treatment, ion exchange occurs. During the ion exchange, one type of alkali metal ions (e.g., Li + or Na + ) at the surface of the just-formed glass-ceramic is replaced by a larger alkali metal ion (e.g., Na + or K + ), respectively. However, in embodiments, the glass composition and phase assemblage at or near the center of the depth or thickness of the glass-ceramic article still have those of the just-formed glass-ceramic. That is, in the present application, the composition (e.g., the composition of the compressive stress layer) and phase assemblage at the center of the chemically strengthened glass-ceramics are the same or substantially the same as those of the glass-ceramic without the chemical strengthening treatment.

[0253] In the present application, the glass-ceramic for making the above chemically strengthened glass-ceramics can be made from a base glass which is subjected to a heat treatment. The composition of the base glass is the same or substantially the same as that of the glass-ceramic, in terms of mole percent or mass percent of oxides.

[0254] In some embodiments of the present application, the composition of the base glass or the composition of the glass-ceramic or the composition at the center or the compressive stress layer of the chemically strengthened glass-ceramics comprises, in terms of mole percent of oxides, SiO2: 58% to 66%, Al2O3: 0% to 3.5%, P2O5: 1% to 3%, ZrO2: 1% to 6%, Li2O: 24% to 32%. By adjusting and controlling the content ranges of the oxide components, a specific glass composition is met, which is beneficial for obtaining a glass-ceramic satisfying a specific crystalline phase structure, and for making a chemically strengthened glass-ceramic satisfying a specific stress structure.

[0255] In some embodiments of the present application, the composition of the substrate glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer, in terms of mole percent of oxides, further comprises: SrO: 0% to 3%, and / or, Na2O: 0% to 4%, and / or, K2O: 0% to 2%, and / or, CaO: 0% to 5%, and / or, B2O3: 0% to 1%, and / or, Ta2O5: 0% to 1%, and / or, BaO: 0% to 3%, and / or, MgO: 0% to 3%, and / or, ZnO: 0% to 3%, and / or, Y2O3: 0% to 1%, and / or, La2O3: 0% to 1%, and / or, Yb2O3: 0% to 1%.

[0256] It can be understood that the measurement method of the composition of the substrate glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer can be converted by conversion, for example, the above measurement method in terms of mole percent of oxides can be converted into measurement in terms of mass percent of oxides.

[0257] In some embodiments of the present application, the composition of the substrate glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer, in terms of mass percent of oxides, comprises: SiO2: 55% to 75%, Al2O3: 0% to 6%, P2O5: 2% to 8%, ZrO2: 3% to 12%, Li2O: 11% to 20%.

[0258] In some embodiments of the present application, the composition of the substrate glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer, in terms of mass percent of oxides, further comprises: SrO: 0% to 6%, and / or, Na2O: 0% to 4%, and / or, K2O: 0% to 2%, and / or, CaO: 0% to 5%, and / or, B2O3: 0% to 1%, and / or, Ta2O5: 0% to 2%, and / or, BaO: 0% to 6%, and / or, MgO: 0% to 3%, and / or, ZnO: 0% to 3%, and / or, Y2O3: 0% to 2%, and / or, La2O3: 0% to 2%, and / or, Yb2O3: 0% to 4%.

[0259] In the present application, Si02 is a network former oxide of the glass network and is an indispensable component of the glass network structure. Meanwhile, Si02 is also an important component of the main crystalline phase lithium disilicate (Li2Si205) crystalline phase. Properly increasing the content of Si02 can increase the stability and mechanical strength of the glass, which is beneficial to ensure the precipitation of lithium disilicate crystalline phase with a desired content. However, excessive Si02 will increase the viscosity of the base glass, making the glass melting more difficult, thereby reducing the formability of the base glass. Therefore, in order to meet the glass formability requirements and achieve the desired crystallization effect of the present application, and thus obtain the desired glass-ceramic or chemically strengthened glass-ceramic product of the present application, in the present application, the molar percentage content of Si02 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center or the tensile stress layer of the chemically strengthened glass-ceramic is 58% to 66%, or the mass percentage content of Si02 is 55% to 75%.

[0260] In some embodiments, the molar percentage of Si02 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center or the tensile stress layer of the chemically strengthened glass-ceramic is 58% to 66%, 60.5% to 64.5%, 60% to 65%, or 60.5% to 64%, in terms of mole percentage of oxides. In some embodiments, the molar percentage of Si02 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center or the tensile stress layer of the chemically strengthened glass-ceramic is 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 60.92%, 60.94%, 61.15%, 61.16%, 61.43%, 61.72%, 61.82%, 62.58%, 62.77%, 63.16%, 63.39%, or 63.86%, in terms of mole percentage of oxides, or can be a value within a numerical range formed by any two of the above specific numerical values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present 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 a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application can be obtained.

[0261] In some embodiments, the mass percent of Si02in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer can be 55-75%, 60-71%, 62-68%, or 63-71%, in terms of mass percent of oxides. In some embodiments, the mass percent of Si02in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer can be 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 65.86%, 70.54%, 69.11%, 68.06%, 70.78%, 67.86%, 66.67%, 65.63%, 66.06%, 63.50%, 63.96%, 64.45%, 65.47%, or 63.31%, in terms of mass percent of oxides, or a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application is obtained. It is understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application is obtained.

[0262] In the present application, Al203is an optional component, and the addition of an appropriate amount of Al203helps to promote ion exchange to some extent during chemical strengthening, but an excessive amount of Al203will increase the viscosity of the glass and easily lead to the precipitation of other crystalline phases, such as petalite, which affects the crystalline phase structure of the glass-ceramic. Therefore, in order to achieve the desired crystalline phase structure and obtain the desired properties of the glass-ceramic or the chemically strengthened glass-ceramic, the molar percent content of Al203in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer is 0-3.5%, or the mass percent content of Al203is 0-6%.

[0263] In some embodiments, the mole percent of AI2O3 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer, in terms of mole percent of oxides, can be 0%, 0.2%, 0.4%, 0.5%, 0.6%, 0.8%, 1%, 1.2%, 1.4%, 1.5%, 1.6%, 1.8%, 2%, 2.5%, 3%, 3.5%, 1.14%, 1.22%, 1.23%, 1.37%, 1.38%, 1.4%, 1.42%, 1.43%, or 1.44%, or a value within a range having any two of the above specifically recited values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties herein is obtained. It will be appreciated that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties herein is obtained.

[0264] In some embodiments, the mole percent of AI2O3 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer, in terms of mass percent of oxides, can be 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 2.7%, 2.64%, 2.63%, 2.33%, 2.58%, 2.53%, 2.52%, 2.51%, 2.42%, 2.43%, 2.45%, 2.08%, or 2.15%, or a value within a range having any two of the above specifically recited values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties herein is obtained. It will be appreciated that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties herein is obtained.

[0265] In the present application, P2O5 is a glass-forming oxide of the glass, which exists in the network structure as a phosphorus oxygen tetrahedron [PO4]. P2O5 preferentially appears during heat treatment, first causing the glass to phase separate and segregate, forming an amorphous precursor phase Li3PO4, and then, with Li3PO4 as a non-uniform nucleation point, lithium silicate crystalline phases grow in dependence on the amorphous Li3PO4. With the increase of P2O5 content, the non-uniform nucleation points increase, and the Li3PO4 nucleation point effectively refines the grains, which is beneficial to improve the overall transmittance of the glass-ceramics, the uniformity of the glass, and reduce the b value. However, when the P2O5 content is too high, more Li3PO4 crystals are generated, which makes the Li2O content for forming lithium silicate insufficient, and further causes the base glass to easily precipitate quartz crystals, resulting in the decrease of the transmittance of the glass-ceramics and the overall optical uniformity of the glass-ceramics. When the P2O5 content is too low, the precipitated crystals are too large, which easily causes the glass to lose transparency. Therefore, in order to achieve the desired crystallization effect of the present application and obtain the desired performance of the glass-ceramics or chemically strengthened glass-ceramics, the molar percentage content of P2O5 in the composition of the base glass or the composition of the glass-ceramics or the composition at the center of the chemically strengthened glass-ceramics or the composition of the tensile stress layer is 1% to 3%, or the mass percentage content of P2O5 is 2% to 8%.

[0266] In some embodiments, the molar percentage of P2O5 in the composition of the base glass or the composition of the glass-ceramics or the composition at the center of the chemically strengthened glass-ceramics or the composition of the tensile stress layer, in terms of the mole percentage of oxides, can be 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 1.51%, 1.74%, 1.83%, 1.84%, 1.85%, 1.86%, 1.87%, 1.89%, or 1.92%, or can be a value within a value range with any two of the above specific values as endpoints, as long as a glass-ceramics or chemically strengthened glass-ceramics with the desired performance of the present 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 a glass-ceramics or chemically strengthened glass-ceramics with the desired performance of the present application can be obtained.

[0267] In some embodiments, the mass percentage of P2O5 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer can be 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 4.66%, 5.01%, 4.89%, 4.46%, 3.98%, 4.79%, 4.72%, 4.67%, 4.68%, 4.49%, 4.65%, 4.49%, 4.52%, or 4.56%, or a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present 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 a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application is obtained.

[0268] In the present application, ZrO2 is an intermediate oxide for glass formation, and an appropriate amount of ZrO2 can improve the chemical stability of the glass, increase the hardness of the glass, and improve the scratch resistance and drop resistance of the glass. In addition, due to the high cation charge and strong field of ZrO2, ZrO2 has a large accumulation effect on the structure of the glass, and is also commonly used as a nucleating agent in glass-ceramics. The greater the content of ZrO2, the greater the A value that the lithium disilicate glass-ceramic can tolerate without surface cracking during chemical strengthening, and the more ideal the stress effect. However, when the content of ZrO2 is high, the optical performance of the glass-ceramic is poor. Therefore, in order to meet the requirements of glass forming and achieve the desired strength effect of the present application, the molar percentage of ZrO2 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer is 1% to 6%, or the mass percentage of ZrO2 is 3% to 12%.

[0269] In some embodiments, the mole percent of Zr02in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer can be 1%, 1.2%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 1.44%, 1.89%, 2.18%, 2.34%, 2.36%, 3.23%, 4.47%, 4.57%, 4.59%, 4.61%, or 4.66%, or a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application is obtained. It is understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application is obtained.

[0270] In some embodiments, the mass percent of Zr02in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer can be 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 7.07%, 3.26%, 4.24%, 4.85%, 5.40%, 5.20%, 7.16%, 10.15%, 10.12%, 9.73%, 10.07%, 9.52%, 9.80%, or 9.88%, or a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application is obtained. It is understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application is obtained.

[0271] In the present application, Li2O as an essential component is a network modifier oxide which not only can improve the viscosity of the glass, promote the melting and fining of the glass melt, but also is one of the main components to form lithium disilicate crystals. Meanwhile, Li2O can also provide alkali lithium ions to exchange with the large radius ions in the molten salt bath, which is an important factor affecting the stress level of the chemical strengthened glass-ceramics. However, excessive Li2O can lead to poor stability of the glass crystallization process, even precipitate other undesirable crystal phases, and make the optical performance of the glass-ceramics worse. Therefore, in order to obtain the glass-ceramics or the chemical strengthened glass-ceramics which meet the desired crystal phase structure, optical performance and mechanical strength performance, the molar percentage content of Li2O in the composition of the base glass or the composition of the glass-ceramics or the composition at the center of the chemical strengthened glass-ceramics or the composition of the tensile stress layer is 24% to 32%, or the mass percentage content of Li2O is 11% to 20%.

[0272] In some embodiments, the molar percentage of Li2O in the composition of the base glass or the composition of the glass-ceramics or the composition at the center of the chemical strengthened glass-ceramics or the composition of the tensile stress layer, in terms of mole percentage of oxides, can be 24%, 24.5%, 25%, 25.5%, 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, 30%, 30.5%, 31%, 31.5%, 32%, 27.54%, 29.25%, 29.38%, 29.52%, 29.8%, 30.22%, 30.4%, 30.44%, 30.81%, or 31.51%, or can be a value within a range defined by any two of the above specific values as endpoints, as long as the glass-ceramics or the chemical strengthened glass-ceramics with the desired properties of the present 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 glass-ceramics or the chemical strengthened glass-ceramics with the desired properties of the present application can be obtained.

[0273] In some embodiments, the mass percent of Li20 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer can be 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, 16.15%, 16.70%, 16.44%, 14.85%, 17.50%, 16.61%, 16.35%, 15.73%, 15.71%, 15.10%, 15.63%, 15.11%, or 15.21%, or a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application is obtained. It should be understood that any of the above ranges can be combined with any other range, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application is obtained.

[0274] In the present application, Na20 is an optional component and is an interstitial oxide. An appropriate amount of Na20 can provide free oxygen, improve the viscosity of the glass, promote melting and fining of the glass melt, and also adjust the rate of chemical strengthening, but an excessive amount of Na20 can not only reduce the crystallinity of the glass-ceramic, but also affect the chemical strengthening effect. Therefore, in order to ensure that the glass-ceramic or the chemically strengthened glass-ceramic meets the desired structure and obtains the desired properties, the molar percent of Na20 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer is 0% to 4%, or the mass percent of Na20 is 0% to 4%.

[0275] In some embodiments, the molar percent of Na20 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer 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%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, or 4%, or a value in a range between any two of the above specifically recited values, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application is obtained. It is to be understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application is obtained.

[0276] In some embodiments, the mass percent of Na20 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer can be 0%, 0.1%, 0.2%, 0.3%, 0.34%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, or 4%, or a value in a range between any two of the above specifically recited values, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application is obtained. It is to be understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application is obtained.

[0277] In the present application, K2O is an interstitial oxide of the glass network and is one of the optional components. An appropriate amount of K2O can provide free oxygen to increase the SiO2 / O ratio in the glass structure, but too much K2O can affect the network structure of the glass, affecting the optical properties, thermal stability, chemical stability, mechanical strength, and weather resistance of the glass. Therefore, to ensure that the glass-ceramic or chemically strengthened glass-ceramic meets the desired structure and obtains the desired properties, the molar percentage of K2O in the composition of the base glass or the composition of the glass-ceramic or the composition at the center or the tensile stress layer of the chemically strengthened glass-ceramic is 0% to 2%, or the mass percentage of K2O is 0% to 2%.

[0278] In some embodiments, the molar percentage of K2O in the composition of the base glass or the composition of the glass-ceramic or the composition at the center or the tensile stress layer of the chemically strengthened glass-ceramic, in terms of mole percent of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, or 2%, or can be a value within a range defined by any two of the above specific numerical values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present 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 a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application can be obtained.

[0279] In some embodiments, the mass percentage of K2O in the composition of the base glass or the composition of the glass-ceramic or the composition at the center or the tensile stress layer of the chemically strengthened glass-ceramic, in terms of mass percent of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.46%, 0.5, 0.6%, 0.7%, 0.78%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, or 2%, or can be a value within a range defined by any two of the above specific numerical values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present 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 a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application can be obtained.

[0280] In the present application, CaO is an optional component of the glass-forming network-modifying oxide. An appropriate amount of CaO helps to reduce the high temperature viscosity of the glass and increase the density of the glass. However, an excessive amount of CaO can shorten the working range of the glass and increase the brittleness of the glass. Therefore, to obtain a glass-ceramic or a chemically strengthened glass-ceramic that satisfies the desired optical and mechanical strength properties, the molar percentage of CaO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer can be in the range of 0% to 5%, or the mass percentage of CaO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer can be in the range of 0% to 5%.

[0281] In some embodiments, the molar percentage of CaO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 0.92%, or 2.67%, or can be a value within a range between any two of the above specifically named values as the endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It should be appreciated that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0282] In some embodiments, the mass percentage of CaO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 0.92%, or 2.7%, or can be a value within a range between any two of the above specifically named values as the endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It should be appreciated that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0283] In the present application, BaO as an optional component is an alkaline earth metal oxide. An appropriate amount of BaO can function to adjust the composition of the glass phase in the glass-ceramic, which can help to increase the density of the glass-ceramic and increase the Young's modulus thereof. However, an excessive amount of BaO can deteriorate the optical properties of the glass-ceramic, and thus, in order to obtain a glass-ceramic or a chemically strengthened glass-ceramic satisfying desired optical and mechanical strength properties, the molar percentage of BaO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer can be 0% to 3%, or the mass percentage of BaO can be 0% to 6%.

[0284] In some embodiments, the molar percentage of BaO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, 0.91%, 1.38%, or 1.83%, or can be a value within a range between any two of the above specific numerical values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application can be obtained. It is to be understood that, in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application can be obtained.

[0285] In some embodiments, the mass percentage of BaO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer can be 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 3.76%, 4.85%, or 2.43%, or can be a value within a range between any two of the above specific numerical values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application can be obtained. It is to be understood that, in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application can be obtained.

[0286] In the present application, SrO as an optional component is an alkaline earth metal oxide. Appropriate amount of SrO can adjust the composition of the glass phase in the glass-ceramic, which helps to increase the density of the glass-ceramic and increase the Young's modulus. At the same time, it is also beneficial to reduce the thermal expansion softening point of the glass-ceramic, and thus to the hot bending forming of the glass-ceramic into 3D curved glass-ceramic. However, excessive SrO will deteriorate the optical performance of the glass-ceramic. Therefore, in order to obtain a glass-ceramic or a chemically strengthened glass-ceramic satisfying the desired optical performance and mechanical strength performance, the molar percentage content of SrO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer is 0% to 3%, or the mass percentage content of SrO is 0% to 6%.

[0287] In some embodiments, the molar percentage of SrO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer, in terms of mole percentage of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, 0.91%, 0.92%, 1.38%, 1.42%, or 1.83%, or can be a value within a range formed by any two of the above specific numerical values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired performance of the present 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 a glass-ceramic or a chemically strengthened glass-ceramic with the desired performance of the present application can be obtained.

[0288] In some embodiments, the mass percentage of SrO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer, in terms of mass percentage of oxide, can be 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 2.68%, 2.57%, 1.64%, or 3.33%, or can be a value within a range formed by any two of the above specific numerical values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired performance of the present 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 a glass-ceramic or a chemically strengthened glass-ceramic with the desired performance of the present application can be obtained.

[0289] In the present application, MgO is an optional component. An appropriate amount of MgO can adjust the composition of the glass phase in the glass-ceramic. However, an excessive amount of MgO can affect the growth of the crystals and the crystalline structure of the glass-ceramic. Therefore, in order to obtain a glass-ceramic or a chemically strengthened glass-ceramic that satisfies the desired optical and mechanical strength properties, the molar percentage of MgO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer is 0% to 3%, or the mass percentage of MgO is 0% to 3%.

[0290] In some embodiments, the molar percentage of MgO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer, in terms of mole percent of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, or 1.83%, or can be a value within a range between any two of the above specifically mentioned values as the endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present application can be obtained.

[0291] In some embodiments, the mass percentage of MgO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer, in terms of mass percent of oxide, can be 0%, 0.1%, 0.15%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, or 1.32%, or can be a value within a range between any two of the above specifically mentioned values as the endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present application can be obtained.

[0292] In the present application, ZnO as an intermediate in the network is one of the optional components. An appropriate amount of ZnO can bind free oxygen, adjust the glass structure, and can remain in the glass phase of the glass-ceramic to increase the glass viscosity, but an excessive amount of ZnO can affect the growth of the crystals and the crystalline structure of the glass-ceramic. Therefore, in order to obtain a glass-ceramic or a chemically strengthened glass-ceramic that satisfies the desired optical and mechanical strength properties, the molar percentage of ZnO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center or the composition of the tensile stress layer of the chemically strengthened glass-ceramic is 0% to 3%, or the mass percentage of ZnO is 0% to 3%.

[0293] In some embodiments, the molar percentage of ZnO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center or the composition of the tensile stress layer of the chemically strengthened glass-ceramic can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, 0.54%, or 1.67%, or can be a value within a range of values formed by any two of the above specific numerical values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present 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 a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present application can be obtained.

[0294] In some embodiments, the molar percentage of ZnO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center or the composition of the tensile stress layer of the chemically strengthened glass-ceramic can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.81%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 2%, 2.5%, 3%, 0.54%, or 2.45%, or can be a value within a range of values formed by any two of the above specific numerical values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present 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 a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present application can be obtained.

[0295] In the present application, B2O3 is an optional component, and appropriate amount of B2O3 can be used as a fluxing agent and / or a softening agent, which is helpful to improve the forming and thermal bending effect of the glass, but excessive amount of B2O3 can cause uncontrolled crystallization process, resulting in poor optical performance of the glass-ceramics. Therefore, in order to obtain the glass-ceramics or chemically strengthened glass-ceramics satisfying the desired optical performance and mechanical strength performance, the molar percentage content of B2O3 in the composition of the base glass or the composition of the glass-ceramics or the composition at the center of the chemically strengthened glass-ceramics or the composition of the tensile stress layer is 0% to 1%, or the mass percentage content of B2O3 is 0% to 1%.

[0296] In some embodiments, the molar percentage of B2O3 in the composition of the base glass or the composition of the glass-ceramics or the composition at the center of the chemically strengthened glass-ceramics or the composition of the tensile stress layer, in terms of mole 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 consisting of any two of the above specific numerical values as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired performance of the present 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 glass-ceramics or chemically strengthened glass-ceramics with the desired performance of the present application can be obtained.

[0297] In some embodiments, the mass percentage of B2O3 in the composition of the base glass or the composition of the glass-ceramics or the composition at the center of the chemically strengthened glass-ceramics or the composition of the tensile stress layer, in terms of mass percentage of oxides, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or 0.55%, or can be a value within a range consisting of any two of the above specific numerical values as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired performance of the present 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 glass-ceramics or chemically strengthened glass-ceramics with the desired performance of the present application can be obtained.

[0298] In the present application, the optional addition of Y2O3, La2O3, Ta2O5, or Yb2O3helps to increase the density and Young's modulus of the glass-ceramic, but can also increase the refractive index of the glass-ceramic, which can decrease the optical performance of the glass-ceramic. Therefore, to obtain a glass-ceramic or chemically strengthened glass-ceramic that satisfies the desired optical and mechanical strength properties, the molar percentage of Y2O3in the base glass composition or the glass-ceramic composition or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer is 0% to 1%, and / or the molar percentage of La2O3is 0% to 1%, and / or the molar percentage of Ta2O5is 0% to 1%, and / or the molar percentage of Yb2O3is 0% to 1%, or the mass percentage of Y2O3is 0% to 2%, and / or the mass percentage of La2O3is 0% to 2%, and / or the mass percentage of Ta2O5is 0% to 2%, and / or the mass percentage of Yb2O3is 0% to 4%.

[0299] In some embodiments, the molar percentage of Y2O3in the base glass composition or the glass-ceramic composition or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer, in terms of mole percent of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1%, or a value within a range between any two of the above specifically named values, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application is obtained. It is understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application is obtained.

[0300] In some embodiments, the mass percentage of Y2O3in the base glass composition or the glass-ceramic composition or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer, in terms of mass percent of oxide, can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, or 0.83%, or a value within a range between any two of the above specifically named values, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application is obtained. It is understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application is obtained.

[0301] In some embodiments, the mole percent of La2O3in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1%, or a value within a range having any two of these values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It is understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0302] In some embodiments, the mole percent of La2O3in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, or 1.18%, or a value within a range having any two of these values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It is understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0303] In some embodiments, the mole percent of Ta2O5in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer 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 a value within a range having any two of these values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It is understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0304] In some embodiments, the mole percent of Ta205in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, or 1.44%, or a value within a range having any two of these values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties herein is obtained. It will be understood that any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties herein is obtained.

[0305] In some embodiments, the mole percent of Yb203in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer 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 a value within a range having any two of these values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties herein is obtained. It will be understood that any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties herein is obtained.

[0306] In some embodiments, the mole percent of Yb203in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.5%, 3%, 3.5%, 4%, or 3.12%, or a value within a range having any two of these values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties herein is obtained. It will be understood that any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties herein is obtained.

[0307] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfy: 2.00≤n(SiO2) / n(Li2O)≤2.40, preferably, 2.00≤n(SiO2) / n(Li2O)≤2.30, more preferably, 2.02≤n(SiO2) / n(Li2O)≤2.20, wherein n(SiO2) and n(Li2O) are the molar percentage contents of SiO2 and Li2O in the center or the tensile stress layer of the chemically strengthened glass-ceramics, respectively.

[0308] It should be noted that in the present application, the content of each oxide is expressed as a percentage of the molar content of the oxide, which is substituted into each formula without the molar unit participating in the calculation of the formula. By adjusting the content of each oxide to satisfy a specific content relationship, it is beneficial to obtain a glass-ceramic or chemically strengthened glass-ceramic that satisfies the desired mechanical strength performance.

[0309] In some embodiments, the value of n(SiO2) / n(Li2O) can be 2, 2.1, 2.2, 2.3, 2.4, 2.01, 2.03, 2.07, 2.08, 2.09, 2.10, or 2.28, or can be a value within a numerical range formed by any two of the above specific numerical values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired performance of the present 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 a glass-ceramic or chemically strengthened glass-ceramic with the desired performance of the present application can be obtained.

[0310] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfy: 90%≤n(SiO2)+n(Li2O)≤96%, preferably, 90%≤n(SiO2)+n(Li2O)≤95%, wherein n(SiO2) and n(Li2O) are the molar percentage contents of SiO2 and Li2O in the center or the tensile stress layer of the chemically strengthened glass-ceramics, respectively.

[0311] In some embodiments, the value of n(SiO2)+n(Li2O) can be 90%, 91%, 92%, 93%, 94%, 95%, 96%, 90.17%, 90.19%, 90.31%, 90.4%, 90.41%, 90.81%, 91.24%, 91.62%, 92.16%, 93.38%, 93.39%, 94.26%, or 94.9%, or can be a value within a numerical range formed by any two of the above specific numerical values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired performance of the present 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 a glass-ceramic or chemically strengthened glass-ceramic with the desired performance of the present application can be obtained.

[0312] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfy: 20%≤2.25xn(Li2O)-8xn(ZrO2)-0.2xn(CaO)≤60%, preferably, 25%≤2.25xn(Li2O)-8xn(ZrO2)-0.2xn(CaO)≤60%, wherein n(Li2O), n(ZrO2), n(CaO) are the molar percentage contents of Li2O, ZrO2, CaO in the center or in the tensile stress layer of the chemically strengthened glass-ceramics, respectively.

[0313] In some embodiments, the value of 2.25xn(Li2O)-8xn(ZrO2)-0.2xn(CaO) can be 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 29.39%, 29.77%, 30.05%, 42.65%, 43.99%, 50.6%, 52.02%, 52.88%, or 56.88%, or can be a value within a range of values formed by any two of the above specific numerical values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present 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 a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application is obtained.

[0314] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfy: 0%≤n(Y2O3)+n(La2O3)+n(Ta2O5)+n(Yb2O3)≤1%, preferably, 0%≤n(Y2O3)+n(La2O3)+n(Ta2O5)+n(Yb2O3)≤0.7%, wherein n(Y2O3), n(La2O3), n(Ta2O5), n(Yb2O3) are the molar percentage contents of Y2O3, La2O3, Ta2O5, Yb2O3 in the center or in the tensile stress layer of the chemically strengthened glass-ceramics, respectively.

[0315] In some embodiments, the value of n(Y2O3)+n(La2O3)+n(Ta2O5)+n(Yb2O3) can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or 0.46%, or can be a value within a range of values formed by any two of the above specific numerical values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present 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 a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application is obtained.

[0316] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfy: 0%≤n(SrO)+n(BaO)+n(CaO)+n(MgO)≤3%, preferably, 0%≤n(SrO)+n(BaO)+n(CaO)+n(MgO)≤2.7%, wherein n(SrO), n(BaO), n(CaO), n(MgO) are the molar percentage contents of SrO, BaO, CaO, MgO in the center or in the tensile stress layer of the chemically strengthened glass-ceramics, respectively.

[0317] In some embodiments, n(SrO)+n(BaO)+n(CaO)+n(MgO) can be 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 0.2%, 0.92%, 1.38%, 1.42%, 1.83%, or 2.67%, or can be a value within a range between any two of the above specific numerical values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application is obtained. It should be appreciated that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application is obtained.

[0318] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfy: 0≤n(SrO) / [n(SrO)+n(BaO)+n(CaO)+n(MgO)]≤1, wherein n(SrO), n(BaO), n(CaO), n(MgO) are the molar percentage contents of SrO, BaO, CaO, MgO in the center or in the tensile stress layer of the chemically strengthened glass-ceramics, respectively.

[0319] In some embodiments, n(SrO) / [n(SrO)+n(BaO)+n(CaO)+n(MgO)] can be 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1, or can be a value within a range between any two of the above specific numerical values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application is obtained. It should be appreciated that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application is obtained.

[0320] In the present application, "the main crystal phase is lithium disilicate crystal phase" or other similar expressions mean that the mass of lithium disilicate crystal phase accounts for more than 80 mass percent (mass % or wt %) of all crystal phases of the microcrystalline glass for preparing chemically strengthened microcrystalline glass or the chemically strengthened microcrystalline glass according to the embodiments of the present application. Alternatively, the mass of lithium disilicate crystal phase accounts for 80wt% to 100wt% of all crystal phases of the microcrystalline glass for preparing chemically strengthened microcrystalline glass or the chemically strengthened microcrystalline glass, preferably, the mass of lithium disilicate crystal phase accounts for 85wt% to 100wt% of all crystal phases of the microcrystalline glass or the chemically strengthened microcrystalline glass. In some embodiments, the mass of lithium disilicate crystal phase can account for 80wt%, 80.5wt%, 81wt%, 81.5wt%, 82wt%, 82.5wt%, 83wt%, 83.5wt%, 84wt%, 84.5wt%, 85wt%, 85.5wt%, 86wt%, 86.5wt%, 87wt%, 87.5wt%, 88wt%, 88.5wt%, 89wt%, 89.5wt%, 90wt%, 95wt% or 100wt% of all crystal phases of the microcrystalline glass for preparing chemically strengthened microcrystalline glass or the chemically strengthened microcrystalline glass, or can be a value within a value range constituted by any two specific values as end points, as long as the microcrystalline glass or the chemically strengthened microcrystalline glass with the required performance of the present 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 microcrystalline glass or the chemically strengthened microcrystalline glass with the required performance of the present application can be obtained.

[0321] In the present application, the crystallinity of the microcrystalline glass for preparing chemically strengthened microcrystalline glass does not change significantly after the microcrystalline glass is chemically strengthened to obtain the chemically strengthened microcrystalline glass, that is, the crystallinity of the microcrystalline glass is similar or substantially the same as the crystallinity of the chemically strengthened microcrystalline glass.

[0322] In some embodiments of the present application, the crystallinity of the glass-ceramic or the chemically strengthened glass-ceramic for preparing the chemically strengthened glass-ceramic is not less than 65%, preferably not less than 70%, more preferably the crystallinity of the glass-ceramic or the chemically strengthened glass-ceramic for preparing the chemically strengthened glass-ceramic is 70% to 90%, and even more preferably the crystallinity of the glass-ceramic or the chemically strengthened glass-ceramic for preparing the chemically strengthened glass-ceramic is 70% to 87%. The higher the crystallinity of the glass-ceramic or the chemically strengthened glass-ceramic for preparing the chemically strengthened glass-ceramic, the more beneficial it is to obtain high mechanical strength performance and high damage resistance performance. However, if the crystallinity is too high, it is easy to affect the chemical strengthening effect of the glass-ceramic, resulting in the extension of the chemical strengthening time for preparing the chemically strengthened glass-ceramic with high stress level, and it is also easy to affect the optical performance of the glass-ceramic. In the present application, by making the glass-ceramic meet the desired crystallinity, it is beneficial to make the chemically strengthened glass-ceramic prepared therefrom also meet the desired crystallinity, and it is more beneficial to prepare the chemically strengthened glass-ceramic meeting the desired high mechanical strength performance, high damage resistance performance and excellent optical performance.

[0323] In some embodiments, the crystallinity of the glass-ceramic or the chemically strengthened glass-ceramic for preparing the chemically strengthened glass-ceramic can be 65%, 70%, 72%, 74%, 76%, 78%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 79.85%, 79.85%, 79.85%, 79.85%, 79.85%, 79.85%, 79.85%, 86.82%, 84.25%, 76.8%, 80.4%, 79.65%, 80.42%, 76.7%, 76.6%, 76.6%, 73.64%, 74.85%, 70.69%, 71.95% or 70.4%, or can be a value within a value range constituted by any two of the above specific values as end points, as long as the glass-ceramic or the chemically strengthened glass-ceramic with the required performance of the present 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 glass-ceramic or the chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0324] In some embodiments of the present application, the average grain size in the glass-ceramic or the chemically strengthened glass-ceramic for preparing the chemically strengthened glass-ceramic is not more than 100 nm, preferably not more than 50 nm, and more preferably the average grain size is 15 to 30 nm. A suitable average grain size is beneficial to make the glass-ceramic have excellent optical performance and high intrinsic strength, and if the average grain size is too high, the glass-ceramic is easy to lose transparency. In the present application, by making the glass-ceramic or the chemically strengthened glass-ceramic meet a suitable average grain size, it is beneficial to ensure that the glass-ceramic or the chemically strengthened glass-ceramic has excellent mechanical strength performance and excellent optical performance.

[0325] In some embodiments, the average grain size of the glass-ceramic or the chemically strengthened glass-ceramic for making the chemically strengthened glass-ceramic can be 100 nm, 50 nm, 40 nm, 35 nm, 30 nm, 25 nm, 20 nm, 15 nm, 10 nm, 23.7 nm, 26.8 nm, 23.2 nm, 19.6 nm, 19.5 nm, 24.5 nm, 24.2 nm, 22.8 nm, 23 nm, 24.6 nm, 24.8 nm, 26 nm, 25.5 nm, or 25.6 nm, or a value within a range defined by any two of the above values as endpoints, as long as the glass-ceramic or the chemically strengthened glass-ceramic with the desired properties of the present 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 glass-ceramic or the chemically strengthened glass-ceramic with the desired properties of the present application can be obtained.

[0326] In some embodiments of the present application, non-limiting examples of other possible crystalline phases in the glass-ceramic or the chemically strengthened glass-ceramic for making the chemically strengthened glass-ceramic include: petalite crystalline phase, and / or, lithium phosphate crystalline phase. In some embodiments, the mass percentage of the petalite crystalline phase contained in the glass-ceramic or the chemically strengthened glass-ceramic is less than or equal to 10%, preferably, the mass percentage of the petalite crystalline phase in the glass-ceramic or the chemically strengthened glass-ceramic is less than or equal to 5%, more preferably, the glass-ceramic or the chemically strengthened glass-ceramic does not contain the petalite crystalline phase. By controlling the precipitation of other crystalline phases (such as the petalite crystalline phase), it is more conducive to ensure that the lithium disilicate crystalline phase forms the desired microstructure, thereby ensuring that the glass-ceramic or the chemically strengthened glass-ceramic obtains high mechanical strength performance, excellent optical performance, and excellent damage resistance.

[0327] In some embodiments of the present application, the b value of the glass-ceramic or the chemically strengthened glass-ceramic for making the chemically strengthened glass-ceramic is <1.0, preferably, the b value is <0.80, more preferably, the b value is <0.60, when the thickness is not more than 0.7 mm. It should be understood that in the present application, the optical performance of the glass-ceramic does not change significantly after the glass-ceramic is chemically strengthened to obtain the chemically strengthened glass-ceramic, that is, the b value, transmittance, etc. of the glass-ceramic are similar or substantially the same as those of the chemically strengthened glass-ceramic. In the present application, the b value refers to the optical b value measured under D65 light source, and the Konica Minolta CM-3600A is used in the transmittance mode to test the b value, and the result is shown as b(D65). The smaller the b value, the better the display effect of the glass-ceramic can be ensured. When the b value is large, the glass-ceramic will have an undesirable color, which will result in a display effect that cannot meet the application requirements of the display cover glass.

[0328] In some embodiments, the b-value of the glass-ceramic or chemically strengthened glass-ceramic from which the chemically strengthened glass-ceramic is made can be 1.0, 0.8, 0.9, 0.70, 0.65, 0.60, 0.55, 0.50, 0.45, 0.40, 0.35, 0.30, 0.25, 0.20, 0.39, 0.32, 0.49, 0.41, 0.56, 0.41, 0.47, 0.51, or 0.52, or can be a value within a range between any two of the above specifically named values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It is understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0329] In some embodiments of the present application, the glass-ceramic or chemically strengthened glass-ceramic from which the chemically strengthened glass-ceramic is made is transparent in the visible wavelength range, preferably, the transmittance of the glass-ceramic or chemically strengthened glass-ceramic is ≥ 85% for 550 nm wavelength light, preferably, the transmittance is ≥ 90%, more preferably, the transmittance is ≥ 90.27%. The glass-ceramic or chemically strengthened glass-ceramic satisfying the transmittance can ensure better light transmittance, better transparent effect, and is suitable for use in display screens with requirements for display effect. The "visible wavelength range" herein refers to light with a wavelength of 360 nm-740 nm.

[0330] In some embodiments, the transmittance of the glass-ceramic or chemically strengthened glass-ceramic from which the chemically strengthened glass-ceramic is made can be 85%, 90%, 91%, 92%, 90.76%, 90.76%, 90.76%, 90.76%, 90.76%, 90.76%, 90.76%, 90.31%, 90.59%, 91%, 90.94%, 90.63%, 90.65%, 90.4%, 90.46%, 90.46%, 90.29%, 90.37%, 90.27%, 90.3%, or 90.35% for 550 nm wavelength light, or can be a value within a range between any two of the above specifically named values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It is understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0331] In some embodiments of the present application, the microcrystalline glass for preparing the chemically strengthened microcrystalline glass or the chemically strengthened microcrystalline glass has a Young's modulus greater than 100 GPa, preferably, a Young's modulus greater than 105 GPa, more preferably, a Young's modulus of 110 GPa to 130 GPa. It should be understood that in the present application, the Young's modulus of the microcrystalline glass does not decrease after the microcrystalline glass is subjected to the chemical strengthening treatment to obtain the chemically strengthened microcrystalline glass, that is, when the Young's modulus of the microcrystalline glass is greater than 100 GPa, the Young's modulus of the chemically strengthened microcrystalline glass obtained therefrom should also be greater than 100 GPa. A higher Young's modulus is beneficial to ensuring that the chemically strengthened microcrystalline glass has high mechanical strength performance and high damage resistance.

[0332] In some embodiments, the microcrystalline glass for preparing the chemically strengthened microcrystalline glass or the chemically strengthened microcrystalline glass has a Young's modulus of 100 GPa, 101 GPa, 102 GPa, 103 GPa, 104 GPa, 105 GPa, 106 GPa, 107 GPa, 108 GPa, 109 GPa, 110 GPa, 111 GPa, 112 GPa, 113 GPa, 114 GPa, 115 GPa, 116 GPa, 117 GPa, 118 GPa, 119 GPa, 120 GPa, 125 GPa, 128 GPa, 130 GPa, 118.6 GPa, 116.5 GPa, 116.1 GPa, 115.63 GPa, 116.52 GPa, 117.64 GPa, 118.8 GPa, 117.073 GPa, 114.27 GPa, 114.27 GPa, 113.3 GPa, 114.52 GPa, 120 GPa, 119.3 GPa, or 118.95 GPa, or a value within a range defined by any two of the above-mentioned specific values as endpoints, as long as a microcrystalline glass or a chemically strengthened microcrystalline glass having the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above-mentioned ranges can be combined with any other range, as long as a microcrystalline glass or a chemically strengthened microcrystalline glass having the required performance of the present application can be obtained.

[0333] In some embodiments of the present application, the microcrystalline glass for preparing the chemically strengthened microcrystalline glass or the chemically strengthened microcrystalline glass has a density of 2.51 g / cm 3 to 2.65 g / cm 3 In some embodiments, the microcrystalline glass for preparing the chemically strengthened microcrystalline glass or the chemically strengthened microcrystalline glass has a density of 2.51 g / cm 3 , 2.52 g / cm 3 , 2.53 g / cm 3 , 2.54 g / cm 3 , 2.55 g / cm 32.56 g / cm3 3 2.57 g / cm3 3 2.58 g / cm3 3 2.59 g / cm3 3 2.60 g / cm3 3 2.61 g / cm3 3 2.62 g / cm3 3 2.63 g / cm3 3 2.64 g / cm3 3 2.65 g / cm3 3 or can be a value within a range of values having any two of the specifically recited values as endpoints, as long as the glass-ceramic or chemically strengthened glass-ceramic has the desired properties. It should be understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as the glass-ceramic or chemically strengthened glass-ceramic has the desired properties.

[0334] In some embodiments of the application, the glass-ceramic or chemically strengthened glass-ceramic from which the chemically strengthened glass-ceramic is made has a refractive index of < 1.60, preferably, a refractive index of 1.54-1.60. In some embodiments, the glass-ceramic or chemically strengthened glass-ceramic from which the chemically strengthened glass-ceramic is made can have a refractive index of 1.54, 1.55, 1.56, 1.57, 1.58, 1.59, or 1.60, or can be a value within a range of values having any two of the specifically recited values as endpoints, as long as the glass-ceramic or chemically strengthened glass-ceramic has the desired properties. It should be understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as the glass-ceramic or chemically strengthened glass-ceramic has the desired properties.

[0335] In some embodiments of the application, the glass-ceramic or chemically strengthened glass-ceramic from which the chemically strengthened glass-ceramic is made is 2D, 2.5D, 3D, or shaped. In some embodiments of the application, the glass-ceramic or chemically strengthened glass-ceramic from which the chemically strengthened glass-ceramic is made is isometric or anisometric. One skilled in the art can select as desired. By "anisometric" is meant that the glass-ceramic or chemically strengthened glass-ceramic comprises at least two portions having different thicknesses.

[0336] In some embodiments of the present application, the chemically strengthened glass-ceramics can be subjected to sandpaper drop test using 80 grit sandpaper, and the average sandpaper drop height of the chemically strengthened glass-ceramics is ≥ 1.0 m, preferably ≥ 1.2 m, and more preferably ≥ 1.6 m, when the thickness of the chemically strengthened glass-ceramics is not more than 0.70 mm. The greater the average sandpaper drop height, the better the drop damage resistance of the chemically strengthened glass-ceramics.

[0337] In some embodiments, the average sandpaper drop height of the chemically strengthened glass-ceramics can be 1.0 m, 1.1 m, 1.11 m, 1.12 m, 1.13 m, 1.14 m, 1.15 m, 1.16 m, 1.17 m, 1.18 m, 1.19 m, 1.2 m, 1.25 m, 1.28 m, 1.3 m, 1.35 m, 1.4 m, 1.45 m, 1.5 m, 1.55 m, 1.6 m, 1.65 m, 1.7 m, 1.75 m, 1.8 m, 1.85 m, 1.9 m, 1.95 m, 2.1 m, 2.2 m, 2.3 m, 2.4 m, 2.5 m, or 2 m, or a value within a range defined by any two of the above values as endpoints, as long as the chemically strengthened glass-ceramics having the desired properties of the present 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-ceramics having the desired properties of the present application can be obtained.

[0338] Having described the composition, crystalline phase structure, and stress structure of the chemically strengthened glass-ceramics, the preparation method of the chemically strengthened glass-ceramics will be described in detail.

[0339] In the present application, the preparation process of the chemically strengthened glass-ceramics mainly includes the preparation process of the glass-ceramics and the chemical strengthening process, and the preparation process of the glass-ceramics mainly includes the preparation process of the base glass and the heat treatment process of the base glass.

[0340] In the present application, the base glass can be prepared by using the forming method in the prior art, and the present application does not have any limitation in this regard. For example, the forming method of the base glass can include, but is not limited to, float method, overflow method, calendering method, or casting method. For example, the components are mixed according to the formula, and after melting and forming, the base glass can be obtained by cooling and annealing.

[0341] For example, the raw materials (industrial conventional raw materials) are proportioned according to the formula, a refining agent is added, and then the mixture is mixed for a period of time to obtain a raw material mixture with uniform mixing. The raw material mixture is placed in a platinum crucible, a platinum-rhodium crucible, or a furnace, heated to 1450°C-1700°C, preferably maintained at the melting temperature for 5h or more, and then poured into a molding mold to cool and form, preferably cooled to about 900°C, and then placed in an annealing furnace for annealing treatment, preferably at an annealing temperature of 450°C-650°C, preferably for an annealing time of 10-48h, and then cooled to room temperature in the furnace, to obtain the base glass. The person skilled in the art can select the type and amount of refining agent according to the needs, without the need for creative labor. Further, the refining agent can include, but is not limited to, one or more of sodium chloride, tin oxide, antimony oxide, or arsenic oxide, and the refining agent can be added in an amount of 0-1wt% of the total amount of the raw material.

[0342] In some embodiments of the present application, the heat treatment process of the base glass can include a nucleation treatment and / or a crystallization treatment, preferably both a nucleation treatment and a crystallization treatment. In some embodiments, the crystallization treatment includes a one-step crystallization treatment or a two-step crystallization treatment. In some embodiments, in order to prepare a curved microcrystalline glass, a two-step crystallization treatment can be selected, and when a two-step crystallization treatment is used, the second step of the crystallization treatment is to heat the crystallized glass material obtained from the first step of the crystallization treatment to the hot pressing temperature, while performing the 3D hot bending forming treatment and the second step of the crystallization treatment. The "crystallized glass material" here refers to a glass material with a certain degree of crystallinity, but not yet meeting the crystallinity requirements of the final sample.

[0343] In some embodiments of the present application, in order to obtain the desired physical and chemical properties of the microcrystalline glass, the base glass can be subjected to one-step heat treatment, or two-step or multi-step heat treatment when subjected to heat treatment. If one-step heat treatment is performed, it means that the nucleation treatment (i.e., nucleation treatment) is not performed separately, and the nucleation and crystal growth are performed at the temperature reached in the one-step heating process, which can be understood as direct crystallization treatment. If two-step heat treatment is performed, it means that two-step heating process is performed, including but not limited to the following ways, first step of nucleation treatment, second step of crystallization treatment.

[0344] In some embodiments of the present application, in order to precipitate the desired target crystal phase in the glass-ceramics and obtain the desired physical and chemical properties, the base glass is subjected to nucleation treatment and crystallization treatment in sequence. Further, when the nucleation treatment is performed, the nucleation temperature can be 500-700°C, and the nucleation time can be 10-1440 min; when the crystallization treatment is performed, the crystallization temperature can be 600-800°C, and the crystallization time can be 5-1440 min. During the heat treatment for the nucleation treatment and the crystallization treatment, the heating rate is preferably controlled to be 5-20°C / min, more preferably 10°C / min, and the cooling rate can be 0.1-3°C / min.

[0345] In the present application, after the heat treatment, the skilled person in the art can also perform other conventional steps to obtain the glass-ceramics sample that meets the required specifications or requirements, for example, the sample can be subjected to shaping treatment, cutting treatment (e.g., cutting using a multi-wire saw), CNC processing (computer numerical control), thinning treatment or polishing treatment, etc.

[0346] In some embodiments of the present application, the desired performance of the chemically strengthened glass-ceramics can be obtained by subjecting the aforementioned glass-ceramics to specific chemical strengthening treatment.

[0347] In some embodiments of the present application, the step of polishing and thinning the obtained chemically strengthened glass-ceramics is also included.

[0348] In the present application, the chemical strengthening treatment, i.e., ion exchange method, is performed by immersing the glass-ceramics in a molten salt bath, so that the alkali metal ions with smaller ionic radius in the glass-ceramics are exchanged with the alkali metal ions with larger ionic radius in the molten salt bath, thereby forming a compressive stress layer on the surface of the glass-ceramics and a tensile stress layer in the interior of the glass-ceramics, and obtaining the chemically strengthened glass-ceramics with better mechanical properties.

[0349] In some embodiments of the present application, the chemical strengthening treatment can be a single-step strengthening method or a multi-step strengthening method. The chemical strengthening treatment uses a molten salt bath, which is a molten salt bath containing sodium salt and / or potassium salt. Preferably, the molten salt bath of the present application is a mixed molten salt bath containing sodium salt and potassium salt, and the temperature of the molten salt bath is preferably 380-600°C, more preferably 430-550°C. In some embodiments of the present application, the concentration of potassium salt in the salt bath is preferably 0-95wt%, and the concentration of sodium salt is 5-100wt%, and more preferably a certain amount (e.g., 0.01-0.3wt%) of lithium salt is added to the salt bath. In some embodiments of the present application, the chemical strengthening treatment is preferably performed for 0.1-24h. The sodium salt can be selected from at least one of sodium nitrate, sodium sulfate, and sodium carbonate, and is preferably sodium nitrate; the potassium salt can be selected from at least one of potassium nitrate, potassium sulfate, and potassium carbonate, and is preferably potassium nitrate; and the lithium salt can be selected from at least one of lithium nitrate, lithium sulfate, and lithium carbonate, and is preferably lithium nitrate.

[0350] In the present application, the stress distribution structure of the chemically strengthened glass-ceramics is closely related to the composition of the glass-ceramics (including the oxide composition and the crystal phase composition), the composition of the salt bath, the temperature of the salt bath, and the time of the chemical strengthening treatment. Only when a glass-ceramics with a specific composition is chemically strengthened in a suitable salt bath (a suitable composition and a suitable temperature) for a suitable time, the prepared chemically strengthened glass-ceramics can obtain a specific stress distribution structure, thereby achieving the excellent effects expected by the present application.

[0351] The chemically strengthened glass-ceramics provided by the present application has excellent performance and can be used in electronic devices, including but not limited to mobile phones, tablet computers, handheld game consoles, portable digital devices (such as digital cameras), vehicle-mounted central control, electronic whiteboard glass, smart home, smart wear (such as smart bracelet, smart watch, smart glasses), and can also be used in vehicles, aircraft or vessels, and can also be used in any glass device that requires chemically strengthened glass-ceramics. For example, it can be used in the display screen, cover glass, touch screen, inner screen or inner frame of an electronic device; for example, it can be used in the windshield of a vehicle, aircraft or vessel, such as the front windshield or side windshield. For example, it can be used in worktops, other surfaces, appliance doors, floor tiles, wall panels or storage containers, etc. Other surfaces can include but are not limited to exterior wall surfaces, stair tread surfaces, column facings or counter surfaces, etc., and storage containers can include but are not limited to cups, plates, medicine bottles or beverage bottles, etc.

[0352] For example, the chemically strengthened glass-ceramics provided by the present application has excellent performance and can be used to manufacture glass devices. The glass devices referred to herein can be regular or irregular, and those skilled in the art can manufacture them according to the needs.

[0353] Exemplarily, the chemically strengthened microcrystalline glass with excellent performance provided by the present application can be used to manufacture cover plate glass, which can be a display screen cover plate, a back cover or a camera protection cover plate of an electronic device. Exemplarily, the chemically strengthened microcrystalline glass with excellent performance provided by the present application can be used in an electronic device. Referring to FIGS. 15, 16, 17 and 18, in the embodiments of the present application, an electronic device, which can be a mobile phone, a tablet computer, a smart wearable device or the like, is provided. The electronic device includes a shell 1 assembled on the outer side of the electronic device, and components such as a circuit board and a battery located inside the shell 1. The shell 1 includes a display screen cover plate 11 assembled on the front side and a back cover 12 assembled on the back side. The display screen cover plate 11 is covered on a display module 4. The display screen cover plate 11 and / or the back cover 12 can be made of the aforementioned chemically strengthened microcrystalline glass. In the embodiments of the present application, the display screen cover plate 11 and the back cover 12 can be made of the aforementioned chemically strengthened microcrystalline glass entirely or partially.

[0354] In some embodiments of the present application, as shown in FIG. 16, the electronic device further includes a camera assembly 2 located inside the shell 1. The shell 1 can include a camera protection cover plate 13, which is covered on the camera assembly 2 to protect the camera assembly 2. The camera protection cover plate 13 can be made of the aforementioned chemically strengthened microcrystalline glass. In the embodiments of the present application, the camera protection cover plate 13 can be made of the aforementioned chemically strengthened microcrystalline glass partially or entirely. In the embodiments of the present application, the camera protection cover plate 13 can be located on the front side of the electronic device or on the back side of the electronic device according to the location of the camera assembly 2. In some embodiments of the present application, the camera protection cover plate 13 can be in a separate structure from the display screen cover plate 11 or the back cover 12. In other embodiments of the present application, the camera protection cover plate 13 can be in an integrated structure with the display screen cover plate 11 or the back cover 12.

[0355] In some embodiments of the present application, as shown in FIG. 17, the electronic device further includes a middle frame 3 located between the display module 4 and the shell 1. The middle frame 3 can include the aforementioned chemically strengthened microcrystalline glass.

[0356] In the embodiments of the present application, the display screen cover plate, the back cover, the camera protection cover plate, and the middle frame in the electronic device can be any one of the four using the aforementioned chemically strengthened microcrystalline glass, can be any two of the four using the aforementioned chemically strengthened microcrystalline glass, can be all three of the four using the aforementioned chemically strengthened microcrystalline glass, or can be all four of the four using the aforementioned chemically strengthened microcrystalline glass.

[0357] In some embodiments of the present application, the display screen cover plate, the back cover, the camera protection cover plate, or the middle frame in the electronic device can be 2D, 2.5D, 3D, or special-shaped. In some embodiments of the present application, the display screen cover plate, the back cover, the camera protection cover plate, or the middle frame in the electronic device can be equal-thickness or unequal-thickness.

[0358] The technical solutions of the present application are further described in detail below in combination with embodiments. The embodiments of the present application described in detail below are exemplary and are only used to explain the present application and cannot be understood as a limitation of the present application.

[0359] Embodiment 1

[0360] I. Preparation of base glass

[0361] The raw materials were prepared according to the proportions of each oxide in Table 1, and the total mass of the prepared raw materials was 1000g. 5g of clarifying agent sodium chloride (NaCl) was added to the prepared raw materials, and then a V-type mixer was used to mix the raw materials at a speed of 25r / min for more than 30 minutes to obtain a uniformly mixed raw material mixture.

[0362] The uniformly mixed raw material mixture was transferred to a platinum crucible, and then melted in a platinum-rhodium crucible at 1600°C for more than 5 hours. After that, the mixture was poured into a forming mold for cooling, and cooled to about 900°C. Then, it was placed in an annealing furnace at 460°C for annealing for 12 hours, and then cooled to room temperature in the furnace. Thus, a base glass brick with a size of about 180mm*65mm*24mm was obtained.

[0363] II. Preparation of microcrystalline glass

[0364] The base glass brick was sequentially subjected to nucleation treatment and crystallization treatment, and thus a transparent microcrystalline glass sample brick was prepared. The composition of the prepared microcrystalline glass was the same as that of the base glass, and was shown in Table 1 in terms of mole percentage of oxides. The relationship between the compositions of the microcrystalline glasses was shown in Table 2.

[0365] In order to obtain the glass-ceramic product of the embodiment 1 of the present application, the nucleation treatment is performed at a temperature raising rate of 10 ℃ / min to a nucleation temperature of 520 ℃, and the nucleation holding time is 240 min; the crystallization treatment is performed at a temperature raising rate of 10 ℃ / min from the nucleation temperature to a crystallization temperature of 690 ℃, and the crystallization holding time is 90 min, and then the temperature is lowered to room temperature at a temperature lowering rate of 1 ℃ / min, so that the glass-ceramic sample brick is obtained. The nucleation holding time, i.e. the nucleation time, refers to the time for holding the temperature after the crystallization furnace is raised to the set nucleation temperature at the set temperature raising rate. The crystallization holding time, i.e. the crystallization time, refers to the time for holding the temperature after the crystallization furnace is raised to the set crystallization temperature at the set temperature raising rate.

[0366] After the obtained glass-ceramic sample brick is subjected to the cold processing treatment of cutting, CNC processing (the CNC instrument equipment model used in the present application is RCG500S), and polishing in sequence, the glass-ceramic sample satisfying the required specifications and requirements can be prepared.

[0367] In the specific embodiments and comparative examples of the present application, the glass-ceramic sample brick is subjected to the aforementioned cold processing treatment to prepare a glass-ceramic polished sheet sample with a length and width of 50 mm x 50 mm and a thickness of 0.50 mm.

[0368] The testing conditions of the glass-ceramic sample obtained in the embodiment 1 are as follows:

[0369] The crystalline phase composition, crystallinity, average crystal size (average grain size), dilatometric softening point, density, refractive index, Young's modulus, optical b value, and transmittance (under 550 nm wavelength light) of the glass-ceramic sample are tested respectively, and the results are shown in Table 3.

[0370] III. Preparation of chemically strengthened glass-ceramic

[0371] The glass-ceramic polished sheet obtained above is subjected to one-step chemical strengthening treatment in a mixed salt at 460 ℃, and the strengthening time is 600 min. The composition of the mixed salt is: the mass ratio of NaNO3:KNO3:LiNO3 in the molten salt is 29.99%:69.98%:0.03%.

[0372] After the chemical strengthening treatment, the glass-ceramic sample is taken out and slowly cooled to room temperature on the furnace body of the strengthening furnace, and then the salt on the surface of the glass-ceramic is washed off with clean water. After the glass-ceramic sample is dried, the chemically strengthened glass-ceramic is obtained. The testing conditions of the chemically strengthened glass-ceramic obtained in the embodiment 1 are as follows:

[0373] Ⅰ, whether the chemical strengthening glass-ceramics has "surface cracking" or not: if the light is irradiated on the surface of the chemical strengthening glass-ceramics, no crack is observed on the surface of the glass, as shown in Fig. 1, or the chemical strengthening glass-ceramics is placed under the Axiolab 5 type polarizing microscope, LED light source is used, and the magnification is 100 times or 200 times, no crack is observed on the surface of the glass, as shown in Fig. 3, which indicates that the chemical strengthening glass-ceramics does not have the problem of "surface cracking" in appearance, and is recorded as "qualified" in appearance. If the light is irradiated on the surface of the chemical strengthening glass-ceramics, it is observed that there is a bright crack, as shown in Fig. 2, or the chemical strengthening glass-ceramics is placed under the Axiolab 5 type polarizing microscope, LED light source is used, and the magnification is 100 times or 200 times, it is observed that there is a crack on the surface of the glass, as shown in Fig. 4, which indicates that the chemical strengthening glass-ceramics has the problem of "surface cracking", and is recorded as "unqualified" in appearance.

[0374] The effect of the chemical strengthening glass-ceramics of Example 1 under strong light irradiation is shown in Fig. 1, and the morphology of the main surface and the cross section along the thickness direction of the chemical strengthening glass-ceramics under the microscope (magnification 200 times) is shown in Figs. 3 and 5. It can be seen that there is no bright crack, and there is no irregular crack in the glass interior and surface.

[0375] Ⅱ, stress test: the chemical strengthening glass-ceramics obtained in each example or comparative example is measured for CS_50, DOL_0, |CT_AV| under the SLP-2000 stress tester (the wavelength of the light source used 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 measured, and the exposure time is 300 μsec), and then the CT_LD value of the tensile stress line density, the stress integral value of the compressive stress layer from the main surface of the chemical strengthening glass-ceramics to DOL_0, and the absolute value of the slope of the stress curve when the depth t is 0.5 x DOL_0, |K 0.5×DOL_0 | are calculated. The results are shown in Table 4.

[0376] Ⅲ, surface composition test of the chemical strengthening glass-ceramics: the mass percentage of K2O and the mass percentage of Na2O on the surface of the prepared chemical strengthening glass-ceramics are tested by XRF, and the results are shown in Table 5; at the same time, the polishing machine is used to polish and thin the two main surfaces of the prepared chemical strengthening glass-ceramics, each of the two main surfaces is thinned by 3 μm, and then the thinned chemical strengthening glass-ceramics is obtained, the mass percentage of K2O and the mass percentage of Na2O on the surface of the thinned chemical strengthening glass-ceramics are tested by XRF, and the results are shown in Table 5.

[0377] The transmittance curve of the chemical strengthening glass-ceramics of Example 1 is shown in Fig. 9. As shown in Fig. 9, in the present application, the chemical strengthening glass-ceramics is transparent in the visible light range and has high transmittance.

[0378] The XRD pattern of the glass-ceramics of Example 1 is shown in FIG. 10, and the XRD patterns of the glass-ceramics of Example 1 before and after chemical strengthening are shown in FIG. 11. As can be seen from FIGS. 10 and 11, in the present application, the main crystal phase in the glass-ceramics and the chemically strengthened glass-ceramics is lithium disilicate crystal phase, and the crystal phase structure of the glass-ceramics does not change significantly before and after chemical strengthening.

[0379] Examples 2-21

[0380] Each of the examples was performed according to Example 1, except that the glass composition, different process parameters, and the corresponding test results of each example are shown in Tables 1-5, respectively.

[0381] Comparative Examples 1-10

[0382] Each of the comparative examples was performed according to Example 1, except that the glass composition, different process parameters, and the corresponding test results of each comparative example are shown in Tables 1-5, respectively.

[0383] The XRD pattern of the glass-ceramics of Comparative Example 5 before and after chemical strengthening is shown in FIG. 12. As can be seen from FIG. 12, in the present application, the main crystal phase in the glass-ceramics and the chemically strengthened glass-ceramics is lithium disilicate crystal phase, and the crystal phase structure of the glass-ceramics does not change significantly before and after chemical strengthening.

[0384] Crystallization upper limit temperature test: In order to analyze the industrialization production capacity of the glass-ceramics of the present application, the crystallization upper limit temperature of the substrate glass of some examples was tested, and the details are shown in Table 3. The crystallization upper limit temperature of the substrate glass of each example tested was between 1000°C and 1100°C, indicating that the glass-ceramics of the present application is conducive to industrialization batch production.

[0385] Dilatometric softening point test: In order to analyze the 3D hot bending effect of the glass-ceramics of the present application, the thermal expansion coefficient test curve of the glass-ceramics of some examples was tested, and the dilatometric softening point was obtained, and the details are shown in Table 3. As can be seen from the test results, the dilatometric softening point of the glass-ceramics of the present application is between 750°C and 830°C, indicating that the glass-ceramics of the present application is conducive to 3D hot bending forming to prepare 3D curved glass-ceramics.

[0386] Table 1

[0387] Table 1 (continued) Note: The oxide content of "0%" in Table 1 means that the component is not intentionally or deliberately added to the glass composition during the initial batching process, but the component can exist as an impurity. The oxide content in Table 1 can be converted from mole percent to mass percent by conversion.

[0388] Table 2

[0389] Table 2 (continued) Note: " / " in Table 2 means that the value does not exist, and the content percentage in Table 2 is calculated by substituting the oxide molar content into each formula, and the molar unit does not participate in the calculation of the formula.

[0390] Table 3

[0391] Table 3 (continued) Note: " / " in Table 3 means that the parameter is not tested or the value does not exist.

[0392] Table 4

[0393] Table 4 (continued)

[0394] Table 5

[0395] Table 5 (continued) Note: M(Na2O) and M(K2O) are the mass percentages of K2O and Na2O on the surface of the chemically strengthened glass ceramic measured by XRF, respectively, and M'(Na2O) and M'(K2O) are the mass percentages of K2O and Na2O on the surface of the chemically strengthened glass ceramic after polishing and thinning the two main surfaces of the chemically strengthened glass ceramic by 3 μm in thickness, respectively, measured by XRF. The appearance "qualified" means that the chemically strengthened glass ceramic has no "surface cracking" problem, and the appearance "unqualified" means that the chemically strengthened glass ceramic has a "surface cracking" problem.

[0396] From the above embodiments and comparative examples of Tables 1-5, compared with the comparative examples, by using the embodiment scheme of the present application, by making the high-lithium-content glass ceramic with a specific composition and lithium disilicate as the main crystal phase, after chemical strengthening treatment, the stress characteristics are satisfied, including that the molar percentage content of ZrO2 in the glass ceramic satisfies the specific requirements of the stress characteristic relationship A (i.e., satisfies the range requirements of the relationship B), and / or the stress characteristic relationship A and the average tensile stress value |CT_AV| satisfy the specific requirements (i.e., satisfy the range requirements of the relationship C), and / or the stress curve slope |K 0.5×DOL_0 satisfies the specific range requirements, not only can effectively overcome the "surface cracking" problem of the prepared chemically strengthened glass ceramic, but also can ensure that the chemically strengthened glass ceramic has high mechanical strength performance, and further can ensure that the chemically strengthened glass ceramic has excellent damage resistance.

[0397] In the schemes of Comparative Example 1-Comparative Example 10, the chemical strengthening glass ceramic composition and stress structure do not meet the specific requirements of the present application, for example, do not meet the specific range requirements of relationship B, relationship C required by the present application scheme, and finally, the chemical strengthening glass ceramics prepared in the schemes of each comparative example either have the problem of "surface cracking", cannot meet the appearance requirements, and cannot achieve excellent anti-drop damage performance, or the stress level obtained is low, the ideal stress effect cannot be obtained, the mechanical properties and strength performance are poor, and excellent anti-drop damage performance cannot be achieved.

[0398] For example, the chemical strengthening glass ceramics prepared in Comparative Example 1-Comparative Example 9 are found to have values exceeding the range requirements of the present application technical scheme after calculation by relationship B, relationship C, and finally it is found that these chemical strengthening glass ceramics all have the problem of "surface cracking", and when the sandpaper drop resistance test is performed, the average sandpaper drop resistance height of these chemical strengthening glass ceramics is less than 0.8 m. The chemical strengthening glass ceramic prepared in Comparative Example 10 is found to have a value lower than the range requirements of the present application technical scheme after calculation by relationship B, relationship C, and finally it is found that the chemical strengthening glass ceramic does not have the problem of "surface cracking", but when the sandpaper drop resistance test is performed, the average sandpaper drop resistance height is only 0.9 m, which is lower than 1 m.

[0399] For example, the same glass-ceramics with the same glass composition and crystal phase structure were used in Embodiments 1-7, Comparative Examples 5-7 and Comparative Example 10 to prepare chemically strengthened glass-ceramics. However, the stress characteristics of the prepared chemically strengthened glass-ceramics and the values of the relationship B and the relationship C satisfied by the composition were different. It was finally found that the chemically strengthened glass-ceramics prepared in Embodiments 1-7, which met the requirements of the technical solution range of the present application, not only overcame the problem of "surface cracking", but also had an average sandpaper drop height of more than 1.3 m when subjected to sandpaper drop tests. The chemically strengthened glass-ceramics prepared in Comparative Examples 5-7, which did not meet the requirements of the technical solution range of the present application, all had the problem of "surface cracking" and had an average sandpaper drop height of less than 0.6 m when subjected to sandpaper drop tests. The chemically strengthened glass-ceramic prepared in Comparative Example 10, which did not meet the requirements of the technical solution range of the present application, did not have the problem of "surface cracking", but had an average sandpaper drop height of less than 1 m when subjected to sandpaper drop tests. This shows that when a glass-ceramic with a high lithium content and lithium disilicate as the main crystal phase is subjected to chemical strengthening treatment to prepare a chemically strengthened glass-ceramic with desired properties, the matching relationship between the glass composition and the stress distribution structure is very important. When a glass-ceramic with a specific composition is matched to a suitable and optimal stress distribution structure, not only can the problem of "surface cracking" of the prepared chemically strengthened glass-ceramic be overcome, but also the chemically strengthened glass-ceramic can have high mechanical strength properties.

[0400] The above only describes specific embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application. Industrial applicability

[0401] In summary, the present application provides a chemically strengthened glass-ceramic, a cover glass, an electronic device and a glass device comprising the same, which has a high lithium content, lithium disilicate as the main crystal phase, and a specific composition and a specific stress distribution structure, so that the chemically strengthened glass-ceramic not only does not have the problem of "surface cracking", but also has high mechanical strength properties.

Claims

1. A chemically strengthened microcrystalline glass, characterized in that, The main crystal phase of the chemically strengthened glass-ceramics is lithium disilicate crystal phase; the crystallinity of the chemically strengthened glass-ceramics is not less than 65%; the Li2O content at the center of the chemically strengthened glass-ceramics is not less than 11% in terms of mass percentage of oxides; The surface of the chemically strengthened microcrystalline glass has a compressive stress layer and has a tensile stress layer inside; the chemically strengthened microcrystalline glass satisfies the following relationship: B = A - 83989 x n(Zr02) 2 + 2526.5 x n(Zr02), 130 < B < 180, preferably 135 < B < 180, more preferably 135 < B < 175; wherein t is the depth from the main surface of the chemically strengthened glass-ceramic, CS(t) is the compressive stress value at the depth t, The stress integral of the compressive stress layer from the main surface of the chemically strengthened glass-ceramics to DOL_0 is A, and the unit is MPa·μm; DOL_0 is the depth of the compressive stress layer, and the unit is μm; In the relationship formula A, the data is substituted into the calculation according to the above unit requirements, and the calculation result is obtained, and the unit is not involved in the calculation; n(ZrO2) is the mole percentage content of ZrO2 at the center of the chemically strengthened glass-ceramics; In the relationship formula B, the numerical value of the relationship formula A and the mole percentage content numerical value of ZrO2 are substituted into the calculation, and the calculation result is obtained, and the unit is not involved in the calculation.

2. The chemically strengthened glass ceramic according to claim 1, wherein The value of the relationship formula A satisfies: 120≤A≤250, preferably 130≤A≤240, and more preferably 130≤A≤235.

3. The chemically strengthened glass-ceramics according to claim 1 or 2, characterized in that, The chemically strengthened glass-ceramics satisfies the following relationship formula: C=A-|CT_AV|, 30≤C≤90, preferably 30≤C≤85, and more preferably 30≤C≤80, wherein |CT_AV| is the absolute value of the average tensile stress, and the unit is MPa.

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

5. The chemically strengthened glass ceramic according to any one of claims 1 to 4, wherein, The chemically strengthened glass-ceramics satisfies: 0.20≤DOL_0 / T≤0.25, preferably 0.21≤DOL_0 / T≤0.23, wherein DOL_0 is the depth of the compressive stress layer, and T is the thickness of the chemically strengthened glass-ceramics; and / or, 90.00μm≤DOL_0≤160.00μm, preferably 100.00μm≤DOL_0≤160.00μm, wherein DOL_0 is the depth of the compressive stress layer; and / or, 100.00MPa≤CS_50≤300.00MPa, preferably 110.00MPa≤CS_50≤250.00MPa, and more preferably 110.00MPa≤CS_50≤240.00MPa, wherein CS_50 is the compressive stress value at a depth of 50μm from the main surface of the chemically strengthened glass-ceramics; and / or, 80.00MPa≤|CT_AV|≤200.00MPa, preferably 80.00MPa≤|CT_AV|≤170.00MPa, and more preferably 80.00MPa≤|CT_AV|≤160.00MPa, wherein |CT_AV| is the absolute value of the average tensile stress; and / or, 40000.00MPa / mm≤CT_LD≤100000.00MPa / mm, preferably 47000.00MPa / mm≤CT_LD≤95000.00MPa / mm, wherein CT_LD is the tensile stress line density.

6. The chemically strengthened glass ceramic according to any one of claims 1 to 5, wherein, The chemical strengthening microcrystalline glass satisfies: 0≤M(K2O)≤1.5%, 5%≤M(Na2O)≤25%; M(K2O) is the mass percentage of K2O on the surface of the chemical strengthening microcrystalline glass, and M(Na2O) is the mass percentage of Na2O on the surface of the chemical strengthening microcrystalline glass; and / or, After the two main surfaces of the chemical strengthening microcrystalline glass are each thinned by 3 μm in thickness, the obtained chemical microcrystalline glass satisfies: the mass percentage M'(K2O) of K2O on the surface of the chemical microcrystalline glass and the mass percentage M'(Na2O) of Na2O on the surface of the chemical microcrystalline glass are: 0≤M'(K2O)≤0.5%, 4.0%≤M'(Na2O)≤20%.

7. The chemically strengthened glass ceramic according to any one of claims 1 to 6, wherein, The composition at the center or the tensile stress layer of the chemical strengthening microcrystalline glass comprises, in terms of mole percentage of oxides: SiO2: 58% to 66%, Al2O3: 0% to 3.5%, P2O5: 1% to 3%, ZrO2: 1% to 6%, Li2O: 24% to 32%.

8. The chemically strengthened glass ceramic according to claim 7, wherein, The composition at the center or the tensile stress layer of the chemical strengthening microcrystalline glass further comprises, in terms of mole percentage of oxides: SrO: 0% to 3%, and / or, Na2O: 0% to 4%, and / or, K2O: 0% to 2%, and / or, CaO: 0% to 5%, and / or, B2O3: 0% to 1%, and / or, Ta2O5: 0% to 1%, and / or, BaO: 0% to 3%, and / or, MgO: 0% to 3%, and / or, ZnO: 0% to 3%, and / or, Y2O3: 0% to 1%, and / or, La2O3: 0% to 1%, and / or, Yb2O3: 0% to 1%.

9. The chemically strengthened glass ceramic according to any one of claims 1 to 8, wherein, The composition at the center or the tensile stress layer of the chemical strengthening microcrystalline glass comprises, in terms of mole percentage of oxides: The mole percentage of SiO2 is 60% to 65%, preferably 60.5% to 64.50%; and / or, The mole percentage of Al2O3 is 0.5% to 3.5%, preferably 1% to 1.5%; and / or, The mole percentage of P2O5 is 1% to 2.8%, preferably 1.20% to 2%; and / or, The mole percentage of ZrO2 is 1% to 5%, preferably 1.4% to 5%; and / or, The mole percentage of Li2O is 24% to 31.6%, preferably 27.5% to 31%; and / or, The mole percentage of Na2O is 0% to 3%, preferably 0% to 1%; and / or, The mole percentage of K2O is 0% to 1%, preferably 0% to 0.7%; and / or, The mole percentage of CaO is 0% to 4%, preferably 0% to 3%; and / or, The mole percentage of BaO is 0% to 2%, preferably 1% to 2%; and / or, The mole percentage of SrO is 0% to 2%, preferably 1% to 2%; and / or, The mole percentage of MgO is 0% to 2%; and / or, The mole percentage of ZnO is 0% to 2%; and / or, The mole percentage of B2O3 is 0% to 0.7%, preferably 0% to 0.5%; and / or, Y2O3 is 0% to 0.5%, preferably 0% to 0.2%; and / or, La2O3 is 0% to 0.5%, preferably 0% to 0.2%; and / or, Ta2O5 is 0% to 0.7%, preferably 0% to 0.5%; and / or, Yb2O3 is 0% to 0.7%, preferably 0% to 0.5%.

10. The chemically strengthened glass ceramic according to any one of claims 1 to 9, wherein, The chemically strengthened glass-ceramics satisfies: 2.00≤n(SiO2) / n(Li2O)≤2.40, preferably 2.00≤n(SiO2) / n(Li2O)≤2.30, more preferably 2.02≤n(SiO2) / n(Li2O)≤2.20, wherein n(SiO2), n(Li2O) are the molar percentage contents of SiO2, Li2O at the center of the chemically strengthened glass-ceramics or in the tensile stress layer; and / or, 90%≤n(SiO2)+n(Li2O)≤96%, preferably 90%≤n(SiO2)+n(Li2O)≤95%, wherein n(SiO2), n(Li2O) are the molar percentage contents of SiO2, Li2O at the center of the chemically strengthened glass-ceramics or in the tensile stress layer; and / or, 20%≤2.25×n(Li2O)-8×n(ZrO2)-0.2×n(CaO)≤60%, preferably 25%≤2.25×n(Li2O)-8×n(ZrO2)-0.2×n(CaO)≤60%, wherein n(Li2O), n(ZrO2), n(CaO) are the molar percentage contents of Li2O, ZrO2, CaO at the center of the chemically strengthened glass-ceramics or in the tensile stress layer; and / or, 0%≤n(Y2O3)+n(La2O3)+n(Ta2O5)+n(Yb2O3)≤1%, preferably 0%≤n(Y2O3)+n(La2O3)+n(Ta2O5)+n(Yb2O3)≤0.7%, wherein n(Y2O3), n(La2O3), n(Ta2O5), n(Yb2O3) are the molar percentage contents of Y2O3, La2O3, Ta2O5, Yb2O3 at the center of the chemically strengthened glass-ceramics or in the tensile stress layer; and / or, 0%≤n(SrO)+n(BaO)+n(CaO)+n(MgO)≤3%, preferably 0%≤n(SrO)+n(BaO)+n(CaO)+n(MgO)≤2.7%, wherein n(SrO), n(BaO), n(CaO), n(MgO) are the molar percentage contents of SrO, BaO, CaO, MgO at the center of the chemically strengthened glass-ceramics or in the tensile stress layer; and / or, 0≤n(SrO) / [n(SrO)+n(BaO)+n(CaO)+n(MgO)]≤1, wherein n(SrO), n(BaO), n(CaO), n(MgO) are the molar percentage contents of SrO, BaO, CaO, MgO in the center of the chemically strengthened glass-ceramics or in the tensile stress layer, respectively.

11. The chemically strengthened glass ceramic according to any one of claims 1 to 6, wherein, The composition of the chemically strengthened glass-ceramics in the center or in the tensile stress layer comprises, in mass percentage of oxides: SiO2: 55% to 75%, Al2O3: 0% to 6%, P2O5: 2% to 8%, ZrO2: 3% to 12%, Li2O: 11% to 20%.

12. The chemically strengthened glass ceramic according to claim 11, wherein, The composition of the chemically strengthened glass-ceramics in the center or in the tensile stress layer further comprises, in mass percentage of oxides: SrO: 0% to 6%, and / or, Na2O: 0% to 4%, and / or, K2O: 0% to 2%, and / or, CaO: 0% to 5%, and / or, B2O3: 0% to 1%, and / or, Ta2O5: 0% to 2%, and / or, BaO: 0% to 6%, and / or, MgO: 0% to 3%, and / or, ZnO: 0% to 3%, and / or, Y2O3: 0% to 2%, and / or, La2O3: 0% to 2%, and / or, Yb2O3: 0% to 4%.

13. The chemically strengthened glass-ceramic according to claim 11 or 12, characterized in that, The composition of the chemically strengthened glass-ceramics in the center or in the tensile stress layer comprises, in mass percentage of oxides: The mass percentage of SiO2 is 60% to 71%, preferably 62% to 68%; and / or, The mass percentage of Al2O3 is 1% to 6%, preferably 1% to 3%, more preferably 2% to 3%; and / or, The mass percentage of P2O5 is 3% to 6%, preferably 3.5% to 5.5%; and / or, The mass percentage of ZrO2 is 4% to 11%, preferably 4% to 10%; and / or, The mass percentage of Li2O is 11% to 18%, preferably 12% to 17.5%, more preferably 14% to 17%; and / or, The mass percentage of Na2O is 0% to 2.8%, preferably 0% to 1%; and / or, The mass percentage of K2O is 0% to 1.5%, preferably 0% to 1%; and / or, The mass percentage of CaO is 0% to 3%, preferably 0% to 1%; and / or, The mass percentage of BaO is 0% to 5.5%, preferably 0% to 5%; and / or, The mass percentage of SrO is 0% to 5%, preferably 0% to 3.5%; and / or, The mass percentage of MgO is 0% to 2%; and / or, The mass percentage of ZnO is 0% to 2.5%; and / or, The mass percentage of B2O3 is 0% to 0.8%, preferably 0% to 0.5%; and / or, The mass percentage of Y2O3 is 0% to 1%, preferably 0% to 0.8%; and / or, The mass percentage of La2O3 is 0% to 1.5%, preferably 0% to 1%; and / or, The mass percentage of Ta2O5 is 0% to 1.5%, preferably 0% to 0.5%; and / or, Yb2O3 is 0% to 3.5%, preferably 0% to 3%.

14. The chemically strengthened glass ceramic of any one of claims 1 to 13, wherein, The crystallinity of the chemically strengthened glass-ceramics is 70% to 90%, more preferably, the crystallinity of the chemically strengthened glass-ceramics is 70% to 87%; and / or, The average grain size in the chemically strengthened glass-ceramics is not more than 100 nm, preferably, the average grain size is not more than 50 nm, more preferably, the average grain size is 15 nm to 30 nm; and / or, The mass of lithium disilicate crystal phase in the chemically strengthened glass-ceramics accounts for 80wt% to 100wt% of all crystal phases; and / or, The mass percentage of petalite crystal phase in the chemically strengthened glass-ceramics is less than or equal to 10%, preferably less than or equal to 5%, more preferably, the chemically strengthened glass-ceramics does not contain petalite crystal phase.

15. The chemically strengthened glass ceramic of any one of claims 1 to 14, wherein, The b value of the chemically strengthened glass-ceramics is <1.0, preferably <0.8, more preferably ≤0.6, when the thickness is not more than 0.70 mm; and / or, The chemically strengthened glass-ceramics is transparent in the visible light wavelength range, preferably, the transmittance of the chemically strengthened glass-ceramics is ≥85% for 550 nm wavelength light, preferably ≥90%, more preferably ≥90.27%.

16. The chemically strengthened glass ceramic of any one of claims 1 to 15, wherein, The Young's modulus of the chemically strengthened glass-ceramics is greater than 100 GPa, preferably greater than 105 GPa, more preferably 110 GPa to 130 GPa; and / or, The density of the chemically strengthened glass-ceramics is 2.51 g / cm 3 ~ 2.65 g / cm 3 ; and / or, The refractive index of the chemically strengthened glass-ceramics is ≤1.60, preferably 1.54 to 1.60; and / or, The thickness T of the chemically strengthened glass-ceramics is 0.35 mm to 1.0 mm, preferably 0.4 mm to 0.7 mm, more preferably 0.45 mm to 0.55 mm; and / or, The chemically strengthened glass-ceramics is 2D, 2.5D, 3D or special-shaped; and / or, The chemically strengthened glass-ceramics is equal-thickness or unequal-thickness.

17. The chemically strengthened glass ceramic of any one of claims 1 to 16, wherein, The chemically strengthened glass-ceramics is subjected to sandpaper drop test, using 80-mesh sandpaper, when the thickness is not more than 0.70 mm, the average sandpaper drop height of the chemically strengthened glass-ceramics is ≥1.0 m, preferably ≥1.2 m, more preferably ≥1.6 m.

18. The chemically strengthened glass ceramic according to any one of claims 3 to 17, wherein, The chemically strengthened glass-ceramics satisfies the relationship A: the value of the relationship A is 150.39, 155.13, 157.8, 163.95, 165.23, 167.78, 171.98, 130.02, 148.08, 153.52, 157.87, 150.70, 161.51, 200.59, 217.59, 234.24, 208.06, 207.14, 220.07, 224.21 or 226.66; and / or, The chemically strengthened glass-ceramics satisfies the relationship A: the value of the relationship A is 150.39, 155.13, 157.8, 163.95, 165.23, 167.78, 171.98, 130.02, 148.08, 153.52, 157.87, 150.70, 161.51, 200.59, 217.59, 234.24, 208.06, 207.14, 220.07, 224.21 or 226.66; and / or, The value of relationship B is 144.41, 149.14, 151.82, 157.96, 159.24, 161.80, 166.00, 148.99, 165.83, 168.65, 170.67, 163.85, 155.53, 136.18, 155.43, 172.09, 147.01, 147.17, 165.17, 164.24, or 166.69; and / or, The value of relationship C is 33.97, 40.28, 37.3, 41.41, 47.67, 42.93, 45.51, 45.77, 52.74, 53.28, 51.42, 52.28, 37.27, 64.74, 70.95, 77.45, 57.85, 52.49, 67.32, 66.26, or 64.

31.

19. A cover glass, characterized by The cover glass comprises the chemically strengthened glass ceramic of any one of claims 1-18.

20. An electronic device, comprising: The electronic device comprises the chemically strengthened glass ceramic of any one of claims 1-18.

21. The electronic device of claim 20, wherein, The electronic device comprises a housing assembled on an outer side of the electronic device, the housing comprising the chemically strengthened glass ceramic of any one of claims 1-18.

22. The electronic device of claim 21, wherein, The housing comprises a display cover assembled on a front side of the electronic device, the display cover comprising the chemically strengthened glass ceramic of any one of claims 1-18.

23. The electronic device of claim 21 or 22, wherein, The housing comprises a back cover assembled on a back side of the electronic device, the back cover comprising the chemically strengthened glass ceramic of any one of claims 1-18.

24. The electronic device of claim 21 or 22, wherein, The electronic device further comprises a camera assembly located inside the housing, the housing comprising a camera protection cover, the camera protection cover covering the camera assembly, the camera protection cover comprising the chemically strengthened glass ceramic of any one of claims 1-18.

25. The electronic device of any of claims 21-24, wherein, The electronic device further comprises a middle frame, the middle frame comprising the chemically strengthened glass ceramic of any one of claims 1-18.

26. A glass article, characterized by, The glass device comprises the chemically strengthened glass ceramic of any one of claims 1-18.

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