Glass ceramic, strengthened glass ceramic, cover glass, electronic apparatus and glass device

Abstract

The present application relates to the technical field of glass ceramics and provides a glass ceramic, a strengthened glass ceramic, cover glass, an electronic apparatus, and a glass device. By enabling the content relationship of some oxides in the composition of the glass ceramic to satisfy specific requirements, also enabling the glass ceramic to satisfy the condition that a zinc aluminum spinel-magnesium aluminum spinel solid solution (Zn,Mg)Al2O4 is used as a principal crystalline phase, and enabling the content relationship of a (Zn,Mg)Al2O4 crystalline phase and a ZrO2 crystalline phase to satisfy specific requirements, the glass ceramic obtains a specific crystalline phase structure and a specific glass phase structure, thereby better improving the strength performance of the glass ceramic while ensuring that the glass ceramic achieves excellent optical performance, ensuring that the prepared glass ceramic can be chemically strengthened to prepare a strengthened glass ceramic having both excellent pressure resistance and excellent deformation resistance.

Description

Glass-ceramics, strengthened glass-ceramics, cover glasses, electronic devices, and glass articles

[0001] Cross Reference to Related Applications

[0002] This application claims priority to the Chinese patent application with the title of "Glass-ceramics, strengthened glass-ceramics, cover glasses, electronic devices, and glass articles", the application number of 202410740147.8, which was filed on June 7, 2024, with the State Intellectual Property Office of China, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

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

[0004] In recent years, glass-ceramics are often used in many electronic devices, such as smart phones, smart wear, computers, tablets, video cameras, electronic watches, smart detection devices and other similar devices, as window glass, protective cover glass, etc. While electronic devices used in different scenarios do not encounter exactly the same damage risk points, for example, as smart phones, tablets, etc., the damage risks encountered mainly include scratches, drops, impacts, etc., while electronic devices used in deep-sea exploration environments, diving environments, etc. may encounter not only impact problems, but also water pressure extrusion problems. In order to better meet the application requirements of electronic devices in different application scenarios and achieve better protection of electronic devices, it is necessary to develop glass-ceramic materials that can exhibit higher performance.

[0005] It should be noted that this part of the present application only provides background technology related to the present application, and does not necessarily constitute prior art or public knowledge. SUMMARY

[0006] When the cover glass of an electronic device is extruded or impacted, it will usually deform to varying degrees. The worse the ability to resist deformation, the greater the amount of deformation, and the more likely it is to break. A larger amount of deformation may also cause the internal structure of the electronic device to fail, affecting the normal use of the electronic device.

[0007] The purpose of the present application is to provide a glass-ceramics with a specific composition and a specific crystal phase structure, taking spinel crystal phase as the main crystal phase, and to obtain a strengthened glass-ceramics with excellent compression resistance and excellent deformation resistance by chemical strengthening using the glass-ceramics.

[0008] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0009] In a first aspect, a glass-ceramic is provided, wherein a main crystal phase is a (Zn, Mg)Al2O4 solid solution and a sub-crystal phase is zirconia, and wherein the mass content W [(Zn，Mg)Al2O4] of the (Zn, Mg)Al2O4 solid solution crystal phase and the mass content W [ZrO2] of the zirconia crystal phase satisfy the relationship: Z = W [(Zn，Mg)Al2O4] / W [ZrO2] , 1.00 ≤ Z ≤ 8.00, preferably 1.00 ≤ Z ≤ 6.00, and more preferably 1.20 ≤ Z ≤ 4.50.

[0010] In the composition of the glass-ceramic, the molar percentage of SiO2, [SiO2], the molar percentage of La2O3, [La2O3], the molar percentage of Y2O3, [Y2O3], the molar percentage of BaO, [BaO], the molar percentage of Li2O, [Li2O], the molar percentage of Na2O, [Na2O], the molar percentage of Al2O3, [Al2O3], and the molar percentage of ZrO2, [ZrO2], satisfy the following relationship:

[0011] N = 4.5 × [La2O3] × 100 - ln([La2O3] × 100 + 0.001) + 7.85 × [Y2O3] × 100 - ln([Y2O3] × 100 + 0.008) + exp([BaO] × 100 - 2.5) + ln([Li2O] / [Na2O]) + ln([Al2O3] / [ZrO2]), N < 14.00, preferably 5 ≤ N < 14.00, and more preferably 8 ≤ N < 14.00, and more preferably 8 ≤ N < 11.50.

[0012] ([La2O3] + [Y2O3]) × 100 / [SiO2] > 0.

[0013] In the present application, by satisfying the requirement of the relationship N for the content of some oxides in the composition of the glass-ceramic, while satisfying the requirement that the glass-ceramic has a (Zn, Mg)Al2O4 solid solution as the main crystal phase, and the content of the (Zn, Mg)Al2O4 solid solution crystal phase and the zirconia crystal phase satisfy the relationship Z, the glass-ceramic obtains a specific crystal phase structure and a specific glass phase structure, so as to better improve the strength performance of the glass-ceramic while ensuring that the glass-ceramic has excellent optical performance, and further ensure that the prepared glass-ceramic can be chemically strengthened, so as to obtain a strengthened glass-ceramic with excellent compression resistance and excellent deformation resistance. In the present application, (Zn, Mg)Al2O4 is used to represent the (Zn, Mg)Al2O4 solid solution (or also referred to as a zinc-magnesium spinel solid solution, a zinc-magnesium spinel solid solution, a zinc-magnesium spinel solid solution).

[0014] As an optional embodiment, the glass-ceramic satisfies:

[0015] The ratio Z of the mass content of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase and the mass content of the zirconia crystal phase is 3.03, 2.19, 2.21, 2.29, 2.20, 2.27, 1.68, 3.08, 2.64, 1.87, 1.34, 2.09, 1.28, 1.38, 1.97, 1.62, 2.32, 1.80, 4.41, 2.92, 1.46, 2.44, 2.33, 1.30, 1.31, 1.23, 1.82, 1.44, 1.29, 2.40, 2.14, or 2.66; and / or,

[0016] The value of the relationship formula N is 10.16, 10.59, 11.44, 12.83, 13.91, 12.87, 13.26, 8.47, 8.90, 9.75, 11.10, 10.36, 11.15, 11.54, 10.28, 12.92, 13.74, 9.79, 11.07, 13.54, 8.09, 8.53, 9.38, 10.73, 9.55, 9.99, 10.78, 12.50, 13.39, 13.96, 11.21, 8.29, 8.58, 10.39, or 8.02.

[0017] As an optional embodiment, the composition of the glass-ceramic, in terms of molar percentage of oxides, comprises:

[0018] SiO2 35.00% to 50.00%, Al2O3 20.00% to 35.00%, ZrO2 3.00% to 5.00%, MgO 4.00% to 7.00%, ZnO 9.00% to 12.00%, Na2O 2.00% to 10.00%, Li2O 2.00% to 10.00%, BaO 0.00% to 5.00%, La2O3 0.00% to 1.80%, and Y2O3 0.00% to 0.50%.

[0019] In the present application, by adding La2O3 and / or Y2O3 in the glass composition formula of the high-aluminum and high-zirconium glass composition capable of preparing a glass-ceramic with spinel as the main crystal phase (or also referred to as spinel glass-ceramic), while the content of each component satisfies specific requirements, and by combining the crystal phase composition in the glass-ceramic to satisfy specific content relationships, the strength performance of the glass-ceramic is better improved while ensuring excellent optical performance of the glass-ceramic, and thus the glass-ceramic with spinel crystal phase as the main crystal phase prepared can be chemically strengthened to obtain a strengthened glass-ceramic with excellent compression resistance and excellent deformation resistance.

[0020] As an alternative embodiment, the glass-ceramic has a composition, in mole percent of oxides, comprising:

[0021] SiO2in a range from 40.00% to 48.00%, preferably SiO2in a range from 42.00% to 46.00%; and / or,

[0022] Al2O3in a range from 24.00% to 30.00%, preferably Al2O3in a range from 25.00% to 28.00%; and / or,

[0023] ZrO2in a range from 3.00% to 4.00%, preferably ZrO2in a range from 3.10% to 3.70%; and / or,

[0024] MgO in a range from 5.00% to 6.00%, preferably MgO in a range from 5.20% to 5.90%; and / or,

[0025] ZnO in a range from 9.00% to 11.00%, preferably ZnO in a range from 9.00% to 10.50%; and / or,

[0026] Na2O in a range from 3.00% to 8.00%, preferably Na2O in a range from 3.00% to 6.00%; and / or,

[0027] Li2O in a range from 3.00% to 9.00%, preferably Li2O in a range from 3.50% to 8.00%; and / or,

[0028] BaO in a range from 0% to 4.00%, preferably BaO in a range from 0% to 3.50%; and / or,

[0029] La2O3in a range from 0% to 1.70%, preferably La2O3in a range from 0% to 1.60%.

[0030] As an alternative embodiment, the glass-ceramic has a composition, in mole percent of oxides, comprising:

[0031] the mole percent of Si02 is 45.22%, 45.09%, 44.95%, 44.77%, 44.64%, 45.18%, 45.13%, 44.99%, 44.86%, 44.69%, 44.73%, 44.29%, 43.95%, 44.33%, 44.03%, 43.91%, 45.66%, 45.39%, 45.07%, 45.57%, 45.43%, 45.30%, 45.16%, 45.52%, 44.72%, 44.76%, 42.34%, or 44.04%; and / or,

[0032] the mole percent of Al203 is 25.75%, 25.67%, 25.60%, 25.49%, 25.42%, 25.72%, 25.70%, 25.62%, 25.54%, 25.44%, 25.47%, 25.22%, 25.02%, 25.24%, 25.07%, 25.00%, 26.99%, 26.83%, 26.64%, 26.93%, 26.85%, 26.77%, 26.67%, 26.69%, 26.91%, 26.42%, 26.00%, 25.48%, 27.23%, or 27.44%; and / or,

[0033] the mole percent of Zr02 is 3.38%, 3.37%, 3.36%, 3.35%, 3.34%, 3.32%, 3.29%, 3.28%, 3.41%, 3.39%, 3.40%, 3.42%, 3.49%, or 3.55%; and / or,

[0034] the mole percent of MgO is 5.46%, 5.44%, 5.43%, 5.41%, 5.39%, 5.45%, 5.42%, 5.40%, 5.35%, 5.31%, 5.32%, 5.30%, 5.51%, 5.48%, 5.50%, 5.49%, 5.78%, or 5.87%; and / or,

[0035] the mole percent of ZnO is 9.69%, 9.66%, 9.63%, 9.59%, 9.57%, 9.68%, 9.67%, 9.64%, 9.61%, 9.58%, 9.49%, 9.42%, 9.50%, 9.44%, 9.41%, 9.78%, 9.72%, 9.76%, 9.73%, 9.70%, 9.75%, 9.92%, or 10.08%; and / or,

[0036] a molar percentage of Na2O of 3.38%, 3.37%, 3.36%, 3.35%, 3.34%, 3.31%, 3.29%, 3.32%, 3.28%, 3.42%, 3.40%, 3.41%, 3.39%, 3.54%, or 3.60%; and / or,

[0037] a molar percentage of Li2O of 5.76%, 5.74%, 5.73%, 5.70%, 5.68%, 5.75%, 5.71%, 5.69%, 5.64%, 5.60%, 5.65%, 5.61%, 5.59%, 3.86%, 3.84%, 3.81%, 3.85%, 3.83%, 3.82%, 3.79%, 5.81%, 7.67%, or 3.90%; and / or,

[0038] a molar percentage of BaO of 1.16%, 1.15%, 1.14%, 2.11%, 3.45%, 2.31%, 3.46%, 1.17%, 2.13%, 0%, or 1.12%; and / or,

[0039] a molar percentage of La2O3of 0.20%, 0.50%, 0.79%, 1.19%, 1.48%, 0%, 1.18%, 0.78%, 0.48%, or 0.49%; and / or,

[0040] a molar percentage of Y2O3of 0%, 0.20%, 0.30%, 0.50%, 0.49%, 0.19%, or 0.40%.

[0041] As an alternative embodiment, the molar percentage of La2O3[La2O3], the molar percentage of Y2O3[Y2O3], and the molar percentage of BaO [BaO] in the composition of the glass-ceramic satisfy the following relationship:

[0042] A = 3 x [La2O3] x 100 + 5 x [Y2O3] x 100, 0.10 < A < 5.00, preferably, 0.50 < A < 5.00, more preferably, 0.50 < A < 3.50; and / or,

[0043] B = [BaO] x 100 x (([BaO] x 100 - 2.7) 2 - 0.09), 0 < B < 5.50, preferably, 0 < B < 3.00, more preferably, 0 < B < 2.8; and / or,

[0044] C = A + B, C < 8.00, preferably, 1.50 < C < 7.50, more preferably, 1.50 < C < 6.10.

[0045] In the present application, by making La2O3, Y2O3, BaO satisfy a specific molar content relationship, it is more conducive to obtaining a transparent glass-ceramic material with spinel crystal phase as the main crystal phase and improved optical properties.

[0046] As an optional embodiment, the value of relationship A is 0.60, 1.50, 2.37, 3.57, 4.44, 1.00, 1.60, 2.50, 3.37, 4.54, 4.00, 4.82, 4.79, 2.39, 3.34, 1.47, 2.34, 3.10 or 2.00; and / or,

[0047] The value of relationship B is 2.65, 2.66, 2.67, 0.54, 1.63, 0.14, 1.69, 2.63, 0.50, 0 or 2.70; and / or,

[0048] The value of relationship C is 3.25, 4.15, 5.03, 6.23, 7.11, 3.65, 4.25, 5.16, 6.03, 7.21, 6.66, 7.49, 5.33, 4.02, 3.48, 3.16, 3.97, 3.23, 5.02, 7.10, 5.15, 6.02, 7.20, 5.75, 6.65, 7.47, 3.63, 4.65, 5.13, 5.32, 1.60, 3.29 or 4.30.

[0049] As an optional embodiment, in the composition of the glass-ceramic, the molar percentage of La2O3 [La2O3], the molar percentage of Y2O3 [Y2O3], the molar percentage of BaO [BaO] and the molar percentage of Al2O3 [Al2O3] satisfy the following relationship:

[0050] D = (exp([La2O3]x100-2.1)+exp([Y2O3]x100-0.45)) / (0.5+exp([BaO]x100-4.0))+exp([Al2O3]x100-30.0), the value of D is 0.50≤D≤2.50, preferably 0.70≤D≤2.40, more preferably 0.80≤D≤2.00.

[0051] In the present application, by making La2O3, Y2O3, BaO and Al2O3 satisfy a specific molar content relationship, it is more conducive to improving the optical properties of lanthanum and / or yttrium-containing glass-ceramics with spinel as the main crystal phase.

[0052] As an alternative embodiment, the value of the relationship D is 1.42, 1.52, 1.64, 1.88, 2.12, 1.63, 1.77, 1.68, 1.89, 2.26, 2.36, 2.02, 0.91, 1.54, 0.78, 0.85, 1.46, 1.67, 2.14, 1.71, 1.80, 1.92, 2.15, 2.19, 2.28, 2.38, 1.66, 1.97, 2.03, 1.81, 0.92 or 1.75.

[0053] As an alternative embodiment, in the composition of the glass-ceramic, the molar percentage of Li2O [Li2O], the molar percentage of Na2O [Na2O], the molar percentage of ZrO2 [ZrO2], the molar percentage of BaO [BaO], the molar percentage of Al2O3 [Al2O3], the molar percentage of MgO [MgO], the molar percentage of ZnO [ZnO] and the molar percentage of SiO2 [SiO2] satisfy the following relationship:

[0054] M = ([Li2O] + 2.00 x [Na2O] + 2.00 x [ZrO2] + 0.50 x [BaO] + 6.32 x ([Al2O3] - ([MgO] + [ZnO]))) / ([SiO2] + [MgO] + [ZnO]), M > 1.00, preferably, 1.20 < M < 1.7, more preferably, 1.35 < M < 1.60; and / or,

[0055] P = M / exp((N - 14) x 0.5), P > 1.50, preferably, 1.50 < P < 31.0, more preferably, 6.0 < P < 31.0, more preferably, 6.5 < P < 30.5.

[0056] In the present application, by making the molar content of Li2O, Na2O, ZrO2, BaO, Al2O3, MgO, ZnO and SiO2 satisfy specific requirements, it is more advantageous to obtain a strengthened glass-ceramic with excellent deformation resistance after adding lanthanum and / or yttrium containing.

[0057] As an alternative embodiment, the value of the relationship M is 1.44, 1.45, 1.46, 1.51, 1.52, 1.43 or 1.59; and / or,

[0058] The value of the relationship P is 9.82, 7.90, 5.17, 2.58, 1.50, 2.53, 2.08, 22.82, 18.44, 12.06, 6.11, 8.88, 5.99, 4.95, 6.06, 9.29, 2.50, 1.66, 12.41, 6.54, 1.90, 28.97, 23.30, 15.25, 7.74, 13.95, 11.20, 7.55, 3.19, 2.05, 1.54, 6.12, 24.91, 21.93, 9.68, or 30.27.

[0059] As an optional embodiment, in the glass ceramic, the mass content W of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase is 20.00% to 50.00%, preferably 24.00% to 45.00%, more preferably 30.00% to 45.00%; and / or, [(Zn，Mg)Al2O4] As an optional embodiment, in the glass ceramic, the mass content W of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase is 20.00% to 50.00%, preferably 24.00% to 45.00%, more preferably 30.00% to 45.00%; and / or,

[0060] As an optional embodiment, in the glass ceramic, the mass content W of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase is 20.00% to 50.00%, preferably 24.00% to 45.00%, more preferably 30.00% to 45.00%; and / or, [ZrO2] As an optional embodiment, in the glass ceramic, the mass content W of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase is 20.00% to 50.00%, preferably 24.00% to 45.00%, more preferably 30.00% to 45.00%; and / or,

[0061] As an optional embodiment, in the glass ceramic, the mass content W of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase is 20.00% to 50.00%, preferably 24.00% to 45.00%, more preferably 30.00% to 45.00%; and / or,

[0062] In the present application, by satisfying specific requirements for the content of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase and the zirconia crystal phase, it is beneficial to make the glass ceramic obtain a specific crystal phase structure, beneficial to play a synergistic effect of the crystal phase structure and the glass phase structure, thereby beneficial to improve the strength performance of the glass ceramic while ensuring that the glass ceramic achieves excellent optical performance, and further beneficial to prepare a strengthened glass ceramic with excellent compression resistance and excellent deformation resistance.

[0063] As an optional embodiment, in the glass ceramic, the mass content W of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase is 20.00% to 50.00%, preferably 24.00% to 45.00%, more preferably 30.00% to 45.00%; and / or, [(Zn，Mg)Al2O4]are 37.19%, 33.30%, 32.88%, 33.97%, 32.51%, 33.58%, 30.12%, 37.05%, 34.43%, 29.66%, 27.42%, 32.50%, 25.40%, 26.24%, 31.81%, 28.62%, 33.70%, 29.56%, 37.91%, 35.10%, 26.16%, 32.52%, 31.17%, 31.50%, 24.39%, 24.91%, 24.96%, 24.56%, 29.52%, 27.29%, 25.50%, 26.47%, 34.67%, 32.53%, 33.65%, or 31.16%; and / or,

[0064] In the glass-ceramic, the mass content W of the zirconia crystal phase is [ZrO2] are 12.28%, 15.19%, 14.85%, 14.82%, 14.75%, 14.77%, 17.94%, 12.02%, 13.06%, 15.83%, 20.43%, 15.57%, 19.81%, 19.08%, 16.17%, 17.62%, 14.51%, 16.45%, 8.60%, 17.96%, 13.35%, 13.36%, 15.10%, 18.70%, 19.01%, 19.51%, 20.00%, 16.18%, 18.88%, 19.71%, 19.25%, 14.45%, 15.21%, or 12.67%; and / or,

[0065] In all the crystal phases of the glass-ceramic, the mass fraction of the zirconia crystal phase is 24.82%, 31.33%, 31.11%, 30.38%, 31.21%, 30.54%, 37.33%, 24.50%, 27.50%, 34.80%, 42.70%, 32.40%, 43.82%, 42.10%, 33.70%, 38.10%, 30.10%, 35.75%, 18.50%, 25.50%, 40.70%, 29.10%, 30.00%, 43.40%, 43.29%, 43.87%, 44.88%, 35.40%, 40.90%, 43.60%, 30.03%, 31.86%, 29.25%, or 29.99%.

[0066] As an optional embodiment, the glass ceramic is transparent in the visible light wavelength range, preferably, the transmittance of the glass ceramic at a wavelength of 550 nm is ≥ 85.00% at a thickness of 0.90 mm. The glass ceramic satisfying the transmittance can ensure good light transmittance and good transparent effect. The glass ceramic can be used to prepare a strengthened glass ceramic also having high transmittance. The glass ceramic or the strengthened glass ceramic prepared therefrom is suitable for use in an electronic device display screen having high requirements for light transmittance and display effect.

[0067] As an optional embodiment, the average grain size in the glass ceramic is not more than 20 nm, preferably 3.0 nm to 10.0 nm, more preferably 5.0 nm to 10.0 nm; and / or,

[0068] The total content of the crystalline phase in the glass ceramic is 30% to 55%, preferably 35% to 55%, more preferably 40% to 55% by mass percentage.

[0069] In the present application, by making the glass ceramic satisfy the desired total content of crystalline phase / crystallinity, appropriate average grain size, it is beneficial to make the glass ceramic maintain excellent optical performance while satisfying excellent mechanical strength performance and high intrinsic strength. The glass ceramic can be used to prepare a strengthened glass ceramic having excellent optical performance and excellent mechanical strength performance.

[0070] As an optional embodiment, the average grain size in the glass ceramic is 5.6 nm, 6.0 nm, 6.4 nm, 8.4 nm, 9.6 nm, 5.4 nm, 7.1 nm, 5.2 nm, 8.8 nm, 7.2 nm, 9.1 nm, 9.5 nm, 8.1 nm, 6.9 nm, 8.2 nm, 6.8 nm, 6.2 nm, 8.9 nm, 7.5 nm, 5.9 nm, 9.0 nm, 9.3 nm, 7.4 nm, 9.9 nm or 7.0 nm; and / or,

[0071] The total content of the crystal phase in the glass ceramic is 49.47%, 48.49%, 47.73%, 48.79%, 47.26%, 48.35%, 48.06%, 49.07%, 47.49%, 45.49%, 47.85%, 48.07%, 45.32%, 47.98%, 46.24%, 48.21%, 46.01%, 46.51%, 47.12%, 44.12%, 45.87%, 44.53%, 46.60%, 43.09%, 43.92%, 44.47%, 44.56%, 45.70%, 46.17%, 45.21%, 45.72%, 48.12%, 47.74%, 43.32%, or 44.51% by mass.

[0072] As an optional embodiment, the glass ceramic is plate-shaped, the thickness t of the glass ceramic is 0.4 mm to 2.0 mm, preferably, the thickness t is 0.6 mm to 1.5 mm, more preferably, the thickness t is 0.9 mm to 1.5 mm; and / or, the glass ceramic is 2D, 2.5D, 3D or special-shaped; and / or, the glass ceramic is equal-thickness or unequal-thickness. At present, electronic devices begin to pursue thinness, when the thickness is too large, on the one hand, the weight is increased, on the other hand, the optical effect is poor, which is not conducive to achieving high transparency. And when the thickness is too small, it is also not conducive to obtaining excellent compression resistance and deformation resistance. "Unequal thickness" means that the strengthened glass ceramic comprises at least two parts with different thicknesses.

[0073] In a second aspect, a strengthened glass ceramic is provided, the composition of the strengthened glass ceramic at the center or the tensile stress layer is the same as the composition of the glass ceramic according to any one of the embodiments of the first aspect, the strengthened glass ceramic comprises a compressive stress layer region extending from the surface of the strengthened glass ceramic to the compression depth, and has a tensile stress in the interior of the strengthened glass ceramic.

[0074] As an optional embodiment, the strengthened glass ceramic comprises a main crystal phase of a zinc aluminate-magnesium aluminate spinel solid solution and a secondary crystal phase of zirconia, and in the strengthened glass ceramic, the mass content W of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase [(Zn，Mg)Al2O4] and the mass content W of the zirconia crystal phase [ZrO2] satisfies the relationship: Z=W [(Zn，Mg)Al2O4] / W [ZrO2] , 1.00≤Z≤8.00, preferably 1.00≤Z≤6.00, more preferably 1.20≤Z≤4.50;

[0075] The molar percentage of SiO2 [SiO2], the molar percentage of La2O3 [La2O3], the molar percentage of Y2O3 [Y2O3], the molar percentage of BaO [BaO], the molar percentage of Li2O [Li2O], the molar percentage of Na2O [Na2O], the molar percentage of Al2O3 [Al2O3], and the molar percentage of ZrO2 [ZrO2] in the composition of the center or the tensile stress layer of the strengthened glass ceramic satisfy the following relational expression:

[0076] N = 4.5 x [La2O3] x 100 - In([La2O3] x 100 + 0.001) + 7.85 x [Y2O3] x 100 - In([Y2O3] x 100 + 0.008) + exp([BaO] x 100 - 2.5) + In([Li2O] / [Na2O]) + In([Al2O3] / [ZrO2]), N < 14.00, preferably, 5 ≤ N < 14.00, more preferably, 8 ≤ N < 14.00, more preferably, 8 ≤ N < 11.50;

[0077] ([La2O3] + [Y2O3]) x 100 / [SiO2] > 0.

[0078] As an optional embodiment, the composition of the center or the tensile stress layer of the strengthened glass ceramic contains, in terms of molar percentage of oxides:

[0079] SiO2 35.00% to 50.00%, Al2O3 20.00% to 35.00%, ZrO2 3.00% to 5.00%, MgO 4.00% to 7.00%, ZnO 9.00% to 12.00%, Na2O 2.00% to 10.00%, Li2O 2.00% to 10.00%, BaO 0.00% to 5.00%, La2O3 0.00% to 1.80%, and Y2O3 0.00% to 0.50%.

[0080] As an optional embodiment, the molar percentage of La2O3 [La2O3], the molar percentage of Y2O3 [Y2O3], and the molar percentage of BaO [BaO] in the composition of the center or the tensile stress layer of the strengthened glass ceramic satisfy the following relational expression:

[0081] A = 3 x [La2O3] x 100 + 5 x [Y2O3] x 100, 0.10 ≤ A ≤ 5.00, preferably, 0.50 ≤ A ≤ 5.00, more preferably, 0.50 ≤ A ≤ 3.50; and / or,

[0082] B = [BaO] x 100 x (([BaO] x 100 - 2.7) 2-0.09), 0≤B≤5.50, preferably, 0≤B≤3.00, more preferably, 0≤B≤2.8; and / or,

[0083] C=A+B, C<8.00, preferably, 1.50≤C≤7.50, more preferably, 1.50≤C≤6.10.

[0084] As an optional embodiment, the molar percentage of La2O3 [La2O3], the molar percentage of Y2O3 [Y2O3], the molar percentage of BaO [BaO], and the molar percentage of Al2O3 [Al2O3] in the composition of the center of the strengthened glass ceramic or the tension stress layer satisfy the following relationship:

[0085] D=(exp([La2O3]x100-2.1)+exp([Y2O3]x100-0.45)) / (0.5+exp([BaO]x100-4.0))+exp([Al2O3]x100-30.0), the value of D is 0.50≤D≤2.50, preferably, 0.70≤D≤2.40, more preferably, 0.80≤D≤2.00.

[0086] As an optional embodiment, the molar percentage of Li2O [Li2O], the molar percentage of Na2O [Na2O], the molar percentage of ZrO2 [ZrO2], the molar percentage of BaO [BaO], the molar percentage of Al2O3 [Al2O3], the molar percentage of MgO [MgO], the molar percentage of ZnO [ZnO], and the molar percentage of SiO2 [SiO2] in the composition of the center of the strengthened glass ceramic or the tension stress layer satisfy the following relationship:

[0087] M=([Li2O]+2.00x[Na2O]+2.00x[ZrO2]+0.50x[BaO]+6.32x([Al2O3]-([MgO]+[ZnO]))) / ([SiO2]+[MgO]+[ZnO]), M≥1.00, preferably, 1.20≤M≤1.7, more preferably, 1.35≤M≤1.60; and / or,

[0088] P=M / exp((N-14)x0.5), P≥1.50, preferably, 1.50≤P≤31.0, more preferably, 6.0≤P≤31.0, more preferably, 6.5≤P≤30.5.

[0089] As an optional embodiment, the strengthened glass ceramic has |CT_AV| greater than 20.00 MPa, |CT_AV| being the absolute value of the average tensile stress, preferably, the strengthened glass ceramic has |CT_AV| of 25.00 MPa to 60.00 MPa; and / or,

[0090] The strengthened glass ceramic has |CT_CV| greater than 25.00 MPa, |CT_CV| being the absolute value of the maximum tensile stress, preferably, the strengthened glass ceramic has |CT_CV| of 35.00 MPa to 75.00 MPa; and / or,

[0091] The strengthened glass ceramic has CS_50 greater than 100 MPa, CS_50 being the compressive stress value at a depth of 50 μm from the main surface of the strengthened glass ceramic, preferably, the strengthened glass ceramic has CS_50 of 101 MPa to 300 MPa; and / or,

[0092] The strengthened glass ceramic has DOL_0 greater than 144 μm, DOL_0 being the depth of the compressive stress layer, preferably, the strengthened glass ceramic has DOL_0 of 145 μm to 210 μm; and / or,

[0093] The DOL_0 of the strengthened glass ceramic is 0.16t to 0.25t, t being the thickness of the strengthened glass ceramic; and / or,

[0094] The surface K2O mass percentage of the strengthened glass ceramic is 2.0% to 7.5% in terms of mass percentage of oxide, preferably 2.5% to 6.0%.

[0095] In the present application, the strengthened glass ceramic is prepared by chemical strengthening of the glass ceramic satisfying the specific composition and the specific crystal phase structure, so that the prepared strengthened glass ceramic satisfies the suitable stress structure and / or the surface composition, which is beneficial to obtain the strengthened glass ceramic product with higher stress level, and further beneficial to improve the compression resistance and the deformation resistance of the strengthened glass ceramic, so as to ensure excellent compression resistance effect and excellent deformation resistance effect of the strengthened glass ceramic.

[0096] |CT AV| of the strengthened glass-ceramic is 50.57 MPa, 56.75 MPa, 51.89 MPa, 50.87 MPa, 51.03 MPa, 49.80 MPa, 50.55 MPa, 47.42 MPa, 51.74 MPa, 45.60 MPa, 47.10 MPa, 43.21 MPa, 40.60 MPa, 41.88 MPa, 48.60 MPa, 46.55 MPa, 36.82 MPa, 40.00 MPa, 36.50 MPa, 39.52 MPa, 38.30 MPa, 38.25 MPa, 37.03 MPa, 34.05 MPa, 32.76 MPa, 36.06 MPa, 35.26 MPa, 35.61 MPa, 32.05 MPa, 49.12 MPa, 59.15 MPa, 28.19 MPa, or 45.21 MPa; and / or,

[0097] |CT CV| of the strengthened glass-ceramic is 66.96 MPa, 74.75 MPa, 72.29 MPa, 70.16 MPa, 59.70 MPa, 62.51 MPa, 60.42 MPa, 69.94 MPa, 57.20 MPa, 61.47 MPa, 55.09 MPa, 53.81 MPa, 49.63 MPa, 62.65 MPa, 60.93 MPa, 56.82 MPa, 47.29 MPa, 52.89 MPa, 50.56 MPa, 52.27 MPa, 51.44 MPa, 48.52 MPa, 43.74 MPa, 45.36 MPa, 40.32 MPa, 47.46 MPa, 45.37 MPa, 45.80 MPa, 42.86 MPa, 65.02 MPa, 70.43 MPa, 36.51 MPa, or 55.74 MPa; and / or,

[0098] The strengthened glass-ceramics have a CS_50 of 188.73 MPa, 238.02 MPa, 175.19 MPa, 178.48 MPa, 272.31 MPa, 185.74 MPa, 184.10 MPa, 174.37 MPa, 186.55 MPa, 203.60 MPa, 172.65 MPa, 183.45 MPa, 157.60 MPa, 220.37 MPa, 182.85 MPa, 165.54 MPa, 175.57 MPa, 135.15 MPa, 136.45 MPa, 114.86 MPa, 140.51 MPa, 134.80 MPa, 137.95 MPa, 123.41 MPa, 122.00 MPa, 141.28 MPa, 143.34 MPa, 128.42 MPa, 125.39 MPa, 110.21 MPa, 186.91 MPa, 195.42 MPa, 103.64 MPa, or 150.99 MPa; and / or,

[0099] The strengthened glass-ceramics have a DOL_0 of 189.59 pm, 195.43 pm, 195.17 pm, 192.90 pm, 157.48 pm, 191.18 pm, 188.54 pm, 183.66 pm, 194.89 pm, 149.50 pm, 178.97 pm, 171.32 pm, 145.50 pm, 165.66 pm, 185.50 pm, 169.21 pm, 173.75 pm, 176.28 pm, 173.36 pm, 186.10 pm, 186.34 pm, 188.81 pm, 162.71 pm, 162.26 pm, 161.66 pm, 183.63 pm, 175.08 pm, 174.08 pm, 159.88 pm, 193.49 pm, 201.88 pm, 151.46 pm, or 189.03 pm; and / or,

[0100] The strengthened glass-ceramics have a surface K2O mass percent of 5.21%, 4.53%, 4.11%, 3.86%, 2.82%, 5.46%, 5.24%, 4.69%, 4.55%, 4.39%, 4.20%, 4.28%, 4.07%, 3.84%, 3.35%, 3.74%, 2.98%, 3.06%, 3.94%, 3.89%, 3.54%, 3.66%, 3.52%, 3.45%, 4.43%, 4.12%, 3.91%, 3.16%, 4.93%, 4.98%, 2.87%, or 3.21%.

[0101] As an optional embodiment, a 10mm diameter round head metal pressure rod is used to extrude the center of the main surface of the 0.9mm thick strengthened glass ceramic, and a vertical downward load is gradually applied on the metal pressure rod at a rate of 10mm / min, and the deformation of the strengthened glass ceramic under a load of 760N is tested. The strengthened glass ceramic satisfies: the deformation of the stress position of the strengthened glass ceramic to the stress direction is less than 1.850mm at the extrusion position under a load of 760N; and / or,

[0102] A 10mm diameter round head metal pressure rod is used to extrude the center of the main surface of the 0.9mm thick strengthened glass ceramic, and a vertical downward load is gradually applied at a rate of 10mm / min, and the single rod static pressure strength that the strengthened glass ceramic can withstand is tested. The strengthened glass ceramic satisfies: the single rod static pressure strength that the strengthened glass ceramic can withstand is greater than 800N. In this application, the single rod static pressure strength is used to represent the compression resistance of the strengthened glass ceramic. The greater the single rod static pressure strength that the strengthened glass ceramic can withstand, the better the compression resistance. At the same time, the deformation under a higher load extrusion is used to represent the deformation resistance of the strengthened glass ceramic. The smaller the deformation of the strengthened glass ceramic under a higher load extrusion, the better the deformation resistance. The strengthened glass ceramic of the present application has excellent compression resistance and excellent deformation resistance, and can achieve good deformation resistance and compression effect.

[0103] In a third aspect, a cover glass is provided, which is made of the glass ceramic according to any one of the embodiments of the first aspect or comprises the strengthened glass ceramic according to any one of the embodiments of the second aspect, or which comprises the glass ceramic according to any one of the embodiments of the first aspect or comprises the strengthened glass ceramic according to any one of the embodiments of the second aspect.

[0104] In a fourth aspect, an electronic device is provided, which comprises the glass ceramic according to any one of the embodiments of the first aspect or comprises the strengthened glass ceramic according to any one of the embodiments of the second aspect.

[0105] As an optional embodiment, the electronic device comprises a housing assembled on the outer side of the electronic device, and the housing comprises the glass ceramic according to any one of the embodiments of the first aspect or comprises the strengthened glass ceramic according to any one of the embodiments of the second aspect.

[0106] As an optional embodiment, the housing comprises a display screen cover plate assembled on the front side of the electronic device, and the display screen cover plate comprises the glass ceramic according to any one of the embodiments of the first aspect or comprises the strengthened glass ceramic according to any one of the embodiments of the second aspect.

[0107] As an optional embodiment, the housing comprises a back cover assembled at the back side of the electronic device, and the back cover comprises the glass ceramic according to any one of the embodiments of the first aspect or comprises the strengthened glass ceramic according to any one of the embodiments of the second aspect.

[0108] As an optional embodiment, the electronic device further comprises a camera assembly located inside the housing, and the housing comprises a camera protection cover plate covering the camera assembly, and the camera protection cover plate comprises the glass ceramic according to any one of the embodiments of the first aspect or comprises the strengthened glass ceramic according to any one of the embodiments of the second aspect.

[0109] As an optional embodiment, the electronic device further comprises a middle frame, and the middle frame comprises the glass ceramic according to any one of the embodiments of the first aspect or comprises the strengthened glass ceramic according to any one of the embodiments of the second aspect.

[0110] In some embodiments, the housing can be partially made of the aforementioned glass ceramic or strengthened glass ceramic, or can be entirely made of the aforementioned glass ceramic or strengthened glass ceramic.

[0111] The electronic device in the present application can be one or more of the display screen cover plate, the back cover, the camera protection cover plate, and the middle frame, which are made of the glass ceramic according to any one of the embodiments of the first aspect or comprise the strengthened glass ceramic according to any one of the embodiments of the second aspect.

[0112] In a fifth aspect, a glass device is provided, which comprises the glass ceramic according to any one of the embodiments of the first aspect or comprises the strengthened glass ceramic according to any one of the embodiments of the second aspect.

[0113] Compared with the prior art, one or more of the above technical solutions provided in the present application have the following advantages:

[0114] In the present application, by satisfying the specific requirements on the content relationship of part of the oxides in the glass ceramic composition, while making the glass ceramic satisfy the condition that the zinc aluminate-magnesium aluminate spinel solid solution is the main crystal phase, and making the content relationship of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase and the zirconia crystal phase satisfy the specific requirements, the glass ceramic obtains a specific crystal phase structure and a specific glass phase structure, so as to better improve the strength performance of the glass ceramic while ensuring that the glass ceramic realizes excellent optical performance, and further to ensure that the prepared glass ceramic can be chemically strengthened, and a strengthened glass ceramic with excellent compression resistance and excellent deformation resistance is prepared. BRIEF DESCRIPTION OF DRAWINGS

[0115] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those of ordinary skill in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0116] Fig. 1 is a schematic diagram of the process of single-rod static pressure strength test provided by the embodiments of the present application, wherein 30 is a pressure rod, 31 is a sample / sheet of strengthened glass ceramic to be tested, and 32 is a jig.

[0117] Fig. 2 is a schematic diagram of the structure of the jig used in the single-rod static pressure strength test provided by the embodiments of the present application.

[0118] Fig. 3 is a schematic diagram of the cross-sectional structure of the jig used in the single-rod static pressure strength test provided by the embodiments of the present application.

[0119] Fig. 4 is a schematic diagram of the front side structure of an electronic device mentioned in the embodiments of the present application.

[0120] Fig. 5 is a schematic diagram of the rear side structure of an electronic device mentioned in the embodiments of the present application.

[0121] Fig. 6 is a schematic diagram of the structure of an electronic device mentioned in the embodiments of the present application.

[0122] Fig. 7 is a schematic diagram of the structure of an electronic device mentioned in the embodiments of the present application.

[0123] Fig. 8 is a comparison diagram of the transmittance curves of glass ceramic and strengthened glass ceramic provided by Embodiment 1 of the present application.

[0124] Fig. 9 is a comparison diagram of the XRD patterns of glass ceramic and strengthened glass ceramic provided by Embodiment 1 of the present application.

[0125] Fig. 10 is a load deformation curve diagram of strengthened glass ceramic of Embodiment 22, Embodiment 25 and Comparative Example 1.

[0126] Fig. 11 is a comparison diagram of real photos of strengthened glass ceramic of Embodiment 1, Comparative Example 7 and Comparative Example 9 under the same background.

[0127] Reference signs: 1-outer shell; 11-display screen cover plate; 12-rear cover; 13-camera protection cover plate; 2-camera assembly; 3-middle frame; 4-display module. DETAILED DESCRIPTION

[0128] 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 for illustration of the present application and should not be regarded as limiting the scope of the present application. The specific conditions not noted in the examples are carried out according to the conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments not noted by the manufacturer are all conventional products that can be obtained by commercial purchase.

[0129] The endpoints of the ranges and any values disclosed herein are not limited to the precise values stated. The ranges or values should be construed to be roughly around the ranges or values. For ranges of values, the endpoints of the ranges are combined with the individual points to form new ranges that are within the scope of the present application. The term "optional", "optional" or other similar terms mean that the inclusion or exclusion of the item is possible. The term "and / or" herein is inclusive, for example, "A and / or B" means only A, or only B, or both A and B.

[0130] Terminology and test methods:

[0131] In the present application, the glass-ceramics are a kind of solid composite materials containing both glass phase and crystal phase (or also called microcrystalline phase, crystalline phase, crystal phase) prepared by targeted and controlled heat treatment of the base glass. The glass-ceramics are also called microcrystalline glass or crystallized glass or crystalline glass.

[0132] In the present application, the strengthened glass-ceramics refer to the solid composite materials obtained by chemical strengthening treatment of the glass-ceramics. It should be understood that during the chemical strengthening treatment, the alkali metal ions with large ionic radius (such as potassium ions or sodium ions) in the molten salt bath (or also called molten salt bath) will replace the alkali metal ions with small ionic radius (such as sodium ions or lithium ions) in the glass-ceramics, thereby generating an exchange ion volume difference and generating a compressive stress (or also called compression stress) on the surface of the glass-ceramics.

[0133] In the present application, the base glass refers to the glass that has not been subjected to nucleation treatment, crystallization treatment and strengthening treatment, or also called the base glass.

[0134] In the present application, the composition at the center of the strengthened glass-ceramics refers to the composition at or near the center of the depth or thickness of the strengthened glass-ceramics, that is, the composition of the region in the strengthened glass-ceramics that has not been subjected to ion exchange. It should be understood that the composition at the center of the strengthened glass-ceramics is the same as or substantially the same as the composition of the glass-ceramics used to prepare the strengthened glass-ceramics but has not been subjected to chemical strengthening treatment.

[0135] 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 weight content (or also referred to as a weight percentage, a mass percentage) than other crystal phases present in the glass-ceramic.

[0136] In the present application, the total content of crystal phase refers to the percentage of the total mass of crystal phase or crystal in the glass-ceramic to the mass of the glass-ceramic, or also referred to as the crystallinity of the glass-ceramic.

[0137] 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 glass-ceramic sheet.

[0138] In the present application, the visible light wavelength range refers to 360nm-740nm.

[0139] In the present application, when light of a certain wavelength is irradiated onto the main surface of the glass-ceramic, the light will be reflected, absorbed and transmitted, and the ratio of the intensity of the transmitted part to the intensity of the incident light is the transmittance.

[0140] In the present application, the nucleation treatment refers to the formation of stable crystal nuclei in the base glass through heat treatment; the crystallization treatment refers to the precipitation of crystals or crystal phases in the base glass through heat treatment.

[0141] In the present application, |CT_AV| refers to the absolute value of the average tensile stress, with the unit of MPa, and specifically refers to the absolute value of the average of all tensile stresses in the tensile stress layer, which is obtained by SLP-2000 stress meter (or also referred to as a scattered light photoelastic stress meter).

[0142] In the present application, |CT_CV| refers to the absolute value of the maximum tensile stress, with the unit of MPa, and specifically refers to the absolute value of the maximum value of all tensile stresses in the tensile stress layer, which is obtained by SLP-2000 stress meter.

[0143] In the present application, CS_50 refers to the compressive stress value at a depth of 50μm from the main surface of the strengthened glass-ceramic, with the unit of MPa, which is obtained by SLP-2000 stress meter.

[0144] In the present application, DOL_0 refers to the depth of the compressive stress layer, or also referred to as the depth of the compressive stress layer, and specifically refers to the distance from any main surface of the strengthened glass-ceramic to the position close to the surface where the compressive stress is zero, which is obtained by SLP-2000 stress meter.

[0145] In the present application, the aforementioned stress performance testing method is as follows: SLP-2000 stress meter is used to test |CT_CV|, |CT_AV|, CS_50 and DOL_0 of the strengthened glass ceramic. The related parameters of the stress meter are set as follows: light source wavelength is 518 nm, SOC (photoelastic coefficient) is set to 25.5 [(nm / cm) / MPa], refractive index is set to 1.60, and exposure time is 300 μsec. When the transmittance of the glass sample at 550 nm wavelength is lower than 80%, the aforementioned stress characteristic parameters of the sample cannot be tested by using the SLP-2000 stress meter.

[0146] In the present application, SOC, i.e. photoelastic coefficient, photoelasticity mainly refers to the birefringence phenomenon caused by anisotropy of transparent materials after being stressed. The value of the internal residual stress of the materials can be obtained by measuring the photoelastic coefficient and birefringence.

[0147] In the present application, the thickness of the glass ceramic is obtained by using a micrometer. It should be understood that the ion exchange degree changes in a gradient from the surface to the center in the thickness direction, and the total Na-K and / or Li-Na exchange amount increment (mass) is generally not more than 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 have no change. That is, the thickness of the glass ceramic before and after chemical strengthening changes very little and can be basically ignored, and the thickness of the glass ceramic is basically the same as that of the strengthened glass ceramic prepared therefrom.

[0148] In the present application, the density of the glass ceramic is tested by using an electronic density balance SD-200L of Japan ALFAMIRAGE. The measurement principle is Archimedes principle.

[0149] In the present application, the size specification of the glass ceramic sheet is tested by using a two-dimensional measuring machine (instrument model Miyu MY-YXCL-4030).

[0150] In the present application, the crystalline phase composition, total crystalline phase content, content of each crystalline phase and average crystal size of the glass ceramic are confirmed by XRD testing, which is as follows:

[0151] (1) XRD testing: the glass ceramic or the 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 obtained sample is tested by using an X-ray diffractometer to obtain an XRD diffraction peak curve and XRD diffraction data. In the present application, the X-ray diffractometer used is Shimadzu XRD-6100, the target material is copper, 2θ = 10°-80°, the scanning speed is 2° / min, the working voltage is 40 kV, and the working current is 30 mA.

[0152] (2) Determination of the crystal phase: the XRD diffraction data were analyzed by Jade software (JADE Standard 8.6) to determine the crystal phase in the sample.

[0153] (3) Determination of the total content of the crystal phase (or also known as crystallinity): the test results of XRD (RAW format) were imported into Jade software for fitting (R value less than 5%), and the total content of the crystal phase of the sample was calculated by the formula (intensity of diffraction peak / total intensity) x 100%.

[0154] (4) Determination of the content of each crystal phase: the test results of XRD (RAW format) were imported into JADE Standard 8.6 software, the phase was searched, and all the crystal phases corresponding to the diffraction peaks were checked. Then, fitting (R value less than 5%) and calculation were performed, and the content ratio of each crystal phase in the glass-ceramic was obtained by phase quantification. The content of each crystal phase in the glass-ceramic was further calculated by multiplying the content ratio of each crystal phase by the total content of the crystal phase.

[0155] (5) Determination of the average grain size: the average grain size (or also known as the average crystal size) of the sample was calculated according to the Scherrer formula D = Kλ / (βcosθ), using the test results obtained by XRD. 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 was curve-fitted in Jade software, and the fitting report was 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 was converted to radian: β = (FWHM / 180 x 3.14). After calculating the grain size of each diffraction peak by the Scherrer formula D = Kλ / (βcosθ), the average grain size in the sample was obtained by averaging.

[0156] In this application, the transmittance of glass-ceramics was tested by a spectrophotometer. Specifically, the transmittance of 5 pieces of glass-ceramics in the same batch to light of different wavelengths was tested by a spectrophotometer. The average value of the transmittance at 550 nm wavelength of the 5 pieces of glass-ceramics was taken as the transmittance result of the glass-ceramics at 550 nm wavelength. The spectrophotometer used in this application was a Konica Minolta Spectrophotometer CM-3600A made in Japan, the light receiving system was transmission, the spectrophotometer was a plane diffraction grating, the wavelength range was 360 nm-740 nm, the wavelength interval was 10 nm, the illumination light source was a pulse xenon lamp x 4, and the instrument was placed in an environment with a temperature of 24°C and an air humidity of 40%.

[0157] In the present application, the method for testing the surface K2O mass percentage (or also referred to as surface K2O concentration) of the strengthened glass ceramic is as follows: the content of K element on the surface of the strengthened glass ceramic is measured by an X-ray fluorescence spectrometer (XRF), and then the surface K2O mass percentage is calculated. The calculation method is as follows: surface K2O mass percentage = (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 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, the test range is a circle with a diameter of 29 mm, and the test method adopts the X_UQ method in the OXSAS analysis software.

[0158] In the present application, no standard test is used in the XRF test, and the concentration of elements or oxides with atomic number 6 and below in the strengthened glass ceramic is not tested. The surface K2O mass percentage of the strengthened glass ceramic = mass of K2O / total mass of oxides, wherein the oxides include SiO2, Al2O3, ZrO2, Na2O, K2O and other oxides that can be accurately tested by XRF, and do not include the content of B2O3 and other oxides that cannot be accurately tested by XRF.

[0159] In the present application, when the XRF instrument is used for testing, the strengthened glass ceramic sheet is directly cut into a suitable size (such as 34 mm*34 mm), placed flat in the sample box, and covered with the test aperture, and then the test can be performed.

[0160] In the present application, when the single-rod static pressure strength test is performed, the strengthened glass ceramic sample sheet with a diameter of 46 mm and a thickness of 0.9 mm is placed in a customized jig (as shown in FIG. 1), and then placed on the bottom ring of a tensile testing machine (LT-850A), positioned so that the centers of the extrusion rod and the jig vertically coincide and the height of the extrusion rod from the jig is 2 mm; the test software is started, the moving speed of the extrusion rod (rod diameter 10 mm, ball head diameter 10 mm) is set to 10 mm / min, and the test is started by clicking; the extrusion rod contacts the strengthened glass ceramic sample sheet at the moment, and force is applied to the center of the strengthened glass ceramic sample sheet at the set moving speed until the strengthened glass ceramic sample sheet breaks. The test software will record the force (N) applied by the extrusion rod to the center of the strengthened glass ceramic sample sheet and the displacement (mm) of the extrusion rod downward at the moment when the extrusion rod contacts the strengthened glass ceramic sample sheet. The test process is shown in FIG. 1.

[0161] The test software will automatically read the force (N) at which the strengthened glass ceramic sample breaks, which is recorded as the single rod static pressure strength that it can withstand. Ten strengthened glass ceramic samples from the same batch are tested, and the average of the test results is taken as the single rod static pressure strength of the strengthened glass ceramic sample to be tested.

[0162] The custom jig in the test method is a cylindrical jig with a diameter of 65 mm and a height of 20 mm, and the specific structure is shown in FIGS. 2 and 3, where Φ1 = 65 mm, Φ2 = 46.02 mm, Φ3 = 44 mm, h1 = 20 mm, h2 = the thickness of the strengthened glass ceramic sample to be tested, and h3 = 15 mm. The height h2 of the sample slot in the custom jig is equal to the thickness of the strengthened glass ceramic sample to be tested, and the strengthened glass ceramic sample to be tested can be placed in the jig. The stepped blind hole in the custom jig for placing the sample for testing is coaxial with the custom jig. The material of the jig is acrylic.

[0163] The test instrument will take the displacement (mm) of the extrusion rod downward as the deformation (mm) of the strengthened glass ceramic sample under stress from the beginning of contact with the strengthened glass ceramic sample. The original data recorded in the test software are exported to obtain the curve of the applied load and the corresponding deformation, and the deformation of the strengthened glass ceramic sample at a load of 760 N is recorded. The deformation here refers to the displacement of the stress point position of the main surface of the strengthened glass ceramic sample in the stress direction. The compression rod used in the test method is a metal compression rod with a diameter of 10 mm, and the round head of the compression rod is a ball head with a diameter of 10 mm. Ten strengthened glass ceramic samples from the same batch are tested to obtain the deformation of the ten strengthened glass ceramic samples at a load of 760 N, and the average is taken as the deformation result of the strengthened glass ceramic sample to be tested at a load of 760 N, with the unit being millimeters. Under the test conditions of the present application, 760 N is approximately equivalent to the pressure at 5 atmospheres.

[0164] When the cover glass of an electronic device is extruded or impacted, it will usually deform to varying degrees. The worse the ability to resist deformation, the greater the amount of deformation, and the more likely it is to break. A larger amount of deformation can also cause the internal structure of the electronic device to fail, affecting the normal use of the electronic device.

[0165] The chemical formula of the spinel crystal is AB2O4, wherein A is a divalent metal ion such as Zn, Fe or Mg with tetrahedral coordination, and B is an Al, Cr or Fe metal ion with octahedral coordination. Since Al-O, Mg-O and Zn-O can form strong ionic bonds, the structure is firm, the hardness is large, and the chemical properties are stable. The Mohs hardness of the spinel crystal is basically between 7 and 8, close to 8. Therefore, in theory, a spinel glass-ceramic with excellent mechanical properties can be obtained by controllably precipitating zinc spinel (or also known as zinc aluminum spinel) and / or magnesium spinel (or also known as magnesium aluminum spinel) and / or a zinc magnesium spinel solid solution (Zn, Mg)Al2O4 in the glass.

[0166] In order to improve the compression resistance and deformation resistance of the glass-ceramic material, the present application further studies the spinel glass-ceramic material with excellent strength. By optimizing the formula and the crystal phase structure of the glass-ceramic, the synergistic effect between the various components is achieved, and the synergistic effect between the glass phase structure and the crystal phase structure is better, so that the excellent optical performance of the glass-ceramic is ensured, and the strength performance of the glass-ceramic is better improved, thereby obtaining a transparent spinel glass-ceramic which can be used to prepare a strengthened glass-ceramic with excellent compression resistance and excellent deformation resistance.

[0167] In the present application, by adding La2O3 and / or Y2O3 in the glass composition formula of the glass-ceramic (or also known as spinel glass-ceramic) which can be prepared with spinel as the main crystal phase, and simultaneously satisfying the specific requirements between the various components, and by combining the crystal phase composition in the glass-ceramic to satisfy the specific content relationship, the excellent optical performance of the glass-ceramic is ensured, and the strength performance of the glass-ceramic is better improved, thereby ensuring that the glass-ceramic prepared with spinel crystal phase as the main crystal phase can be chemically strengthened, and a strengthened glass-ceramic with excellent compression resistance and excellent deformation resistance is obtained.

[0168] As described above, in some embodiments of the present application, a glass-ceramic is provided, the glass-ceramic includes a main crystal phase of zinc aluminum spinel-magnesium aluminum spinel solid solution and a secondary crystal phase of zirconia, and in the glass-ceramic, the mass content W [(Zn，Mg)Al2O4] of the zinc aluminum spinel-magnesium aluminum spinel solid solution crystal phase and the mass content W [ZrO2] of the zirconia crystal phase satisfy the relationship: Z = W [(Zn，Mg)Al2O4] / W [ZrO2] , 1.00≤Z≤8.00, preferably 1.00≤Z≤6.00, more preferably 1.20≤Z≤4.50;

[0169] The molar percentage of SiO2 in the composition of the glass ceramic [SiO2], the molar percentage of La2O3 [La2O3], the molar percentage of Y2O3 [Y2O3], the molar percentage of BaO [BaO], the molar percentage of Li2O [Li2O], the molar percentage of Na2O [Na2O], the molar percentage of Al2O3 [Al2O3], and the molar percentage of ZrO2 [ZrO2] satisfy the following relationship:

[0170] N = 4.5 x [La2O3] x 100 - ln([La2O3] x 100 + 0.001) + 7.85 x [Y2O3] x 100 - ln([Y2O3] x 100 + 0.008) + exp([BaO] x 100 - 2.5) + ln([Li2O] / [Na2O]) + ln([Al2O3] / [ZrO2]), N < 14.00, preferably, 5 ≤ N < 14.00, more preferably, 8 ≤ N < 14.00, more preferably, 8 ≤ N < 11.50;

[0171] ([La2O3] + [Y2O3]) x 100 / [SiO2] > 0.

[0172] The mass content W in the present application [(Zn，Mg)Al2O4] It refers to the mass percentage of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase ((Zn, Mg) Al2O4) in the glass ceramic, which is calculated from the XRD test data. [ZrO2] It refers to the mass percentage of the zirconia crystal phase (ZrO2) in the glass ceramic, which is calculated from the XRD test data.

[0173] In the present application, by making the content of part of the oxides in the composition of the glass ceramic satisfy the requirement of the relationship formula N, at the same time making the glass ceramic satisfy that the zinc aluminate-magnesium aluminate spinel solid solution is the main crystal phase, and making the content of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase and the zirconia crystal phase satisfy the requirement of the relationship formula Z, the glass ceramic obtains a specific crystal phase structure and a specific glass phase structure, so as to better improve the strength performance of the glass ceramic while ensuring that the glass ceramic realizes excellent optical performance, and then to ensure that the prepared glass ceramic can be chemically strengthened, and a strengthened glass ceramic with excellent compression resistance and excellent deformation resistance is prepared. In the present application, (Zn, Mg) Al2O4 is used to represent the zinc aluminate-magnesium aluminate spinel solid solution (or also called zinc magnesium spinel solid solution, zinc spinel-magnesium spinel solid solution, zinc magnesium aluminate spinel solid solution).

[0174] In the present application, the (Zn, Mg)Al204and the tetragonal Zr02crystal phase do not contain alkali metal ions, and thus do not participate in the ion exchange in the chemical strengthening process. Therefore, the crystal phase structure of the strengthened glass ceramic obtained by the chemical strengthening process is basically the same as that of the glass ceramic used for the chemical strengthening. That is, the crystal phase content, crystal composition, and crystal size of the strengthened glass ceramic obtained by the chemical strengthening process are basically the same as those of the glass ceramic used for the chemical strengthening.

[0175] In the present application, the strengthened glass ceramic obtained by the chemical strengthening of the aforementioned glass ceramic contains the (Zn, Mg)Al204and the tetragonal Zr02crystal phase. In the strengthened glass ceramic, the mass content W [(Zn，Mg) Al2O4] and the mass content W [ZrO2] of the tetragonal Zr02crystal phase satisfy the relationship: Z = W [(Zn，Mg)Al2O4] / W [ZrO2] , 1.00≤Z≤8.00, preferably 1.00≤Z≤6.00, and more preferably 1.20≤Z≤4.50. As shown in FIG. 9, the XRD patterns of the glass ceramic before the chemical strengthening and the strengthened glass ceramic obtained after the chemical strengthening are basically the same.

[0176] In some embodiments, in the glass ceramic or the strengthened glass ceramic obtained therefrom, the mass content W [(Zn，Mg)Al2O4] of the (Zn, Mg)Al204crystal phase and the mass content W [ZrO2] of the tetragonal Zr02crystal phase satisfy the relationship: 1.40≤Z≤4.00, 1.60≤Z≤3.50, 4.00≤Z≤6.00, or 1.80≤Z≤3.00.

[0177] In some embodiments, in the glass ceramic or the strengthened glass ceramic obtained therefrom, the mass content W [(Zn，Mg)Al2O4] of the (Zn, Mg)Al204crystal phase and the mass content W [ZrO2]The ratio Z can be 1.00, 1.50, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 7.00, 8.00, 3.03, 2.19, 2.21, 2.29, 2.20, 2.27, 1.68, 3.08, 2.64, 1.87, 1.34, 2.09, 1.28, 1.38, 1.97 The values ​​can be 1.62, 2.32, 1.80, 4.41, 2.92, 1.46, 2.44, 2.33, 1.30, 1.31, 1.23, 1.82, 1.44, 1.29, 2.40, 2.14, or 2.66, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as it yields the glass-ceramic or reinforced glass-ceramic with the performance required by this application. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as it yields the glass-ceramic or reinforced glass-ceramic with the performance required by this application.

[0178] The glass-ceramic of this application can be obtained by heat treatment of a substrate glass. The composition of the substrate glass is the same as or substantially the same as that of the glass-ceramic in terms of the molar percentage of oxides.

[0179] Meanwhile, in this application, glass ceramics can be chemically strengthened to obtain reinforced glass ceramics, and the composition of the center or tensile stress layer of the obtained reinforced glass ceramics is the same as or substantially the same as the composition of the glass ceramics.

[0180] It should be understood that, unless excessive ion exchange treatment is performed, the composition and phase composition of the portions of the reinforced glass ceramic deeper than the compressive stress layer (DOL), such as the center of the reinforced glass ceramic or the tensile stress layer, are the same as or substantially the same as the composition and phase composition of the glass ceramic.

[0181] It should be understood that the surface composition of glass-ceramic products after chemical strengthening treatment may differ from that before chemical strengthening treatment (which involves ion exchange). This is because, during chemical strengthening treatment, a certain type of alkali metal ion (e.g., Li) is present on the surface of the newly formed glass-ceramic. + Or Na + They will be respectively affected by larger alkali metal ions (e.g., Na+). + or K +) is replaced. However, in embodiments, the glass composition and phase assembly at or near the center of the depth or thickness of the glass-ceramic article still has the composition and phase assembly of the as-formed glass-ceramic. That is, in the present application, the composition at the center of the strengthened glass-ceramic or the composition of the compressive stress layer after the chemical strengthening treatment is the same or substantially the same as the composition of the glass-ceramic that has not been subjected to the chemical strengthening treatment.

[0182] In the present application, in the composition of the base glass from which the aforementioned glass-ceramic is prepared or the composition at the center or the compressive stress layer of the strengthened glass-ceramic made from the aforementioned glass-ceramic, the molar percentage of SiO2[SiO2], the molar percentage of La2O3[La2O3], the molar percentage of Y2O3[Y2O3], the molar percentage of BaO [BaO], the molar percentage of Li2O [Li2O], the molar percentage of Na2O [Na2O], the molar percentage of Al2O3[Al2O3], and the molar percentage of ZrO2[ZrO2] satisfy the following relationship:

[0183] N = 4.5 x [La2O3] x 100 - ln([La2O3] x 100 + 0.001) + 7.85 x [Y2O3] x 100 - ln([Y2O3] x 100 + 0.008) + exp([BaO] x 100 - 2.5) + ln([Li2O] / [Na2O]) + ln([Al2O3] / [ZrO2]), N < 14.00, preferably, 5 ≤ N < 14.00, more preferably, 8 ≤ N < 14.00, more preferably, 8 ≤ N < 11.50;

[0184] ([La2O3] + [Y2O3]) x 100 / [SiO2] > 0.

[0185] In some embodiments, the value of the relationship N can be: 9 < N < 13.00, 9.5 < N < 12.00, 10 < N < 11.50, or 8 < N < 10. In some embodiments, the value of the relationship N can be: 5.00, 5.50, 6.00, 6.50, 7.00, 7.50, 8.00, 8.50, 9.00, 9.50, 10.00, 10.50, 11.00, 11.50, 12.00, 12.50, 13.00, 13.50, 13.90, 10.16, 10.59, 11.44, 12.83, 13.91, 12.87, 13.26, 8.47, 8.90, 9.75, 11.10, 10.36, 11.15, 11.54, 10.28, 12.92, 13.74, 9.79, 11.07, 13.54, 8.09, 8.53, 9.38, 10.73, 9.55, 9.99, 10.78, 12.50, 13.39, 13.96, 11.21, 8.29, 8.58, 10.39, or 8.02, or a value within a range defined by any two of the foregoing specific values as endpoints, as long as a glass-ceramic or strengthened glass-ceramic having the desired properties of the present application is obtained. It is understood that in specific embodiments, any of the foregoing ranges can be combined with any other range, as long as a glass-ceramic or strengthened glass-ceramic having the desired properties of the present application is obtained.

[0186] In some embodiments of the present application, the glass-ceramic, or the composition of the strengthened glass-ceramic made therefrom, at the center or the composition of the compressive stress layer, or the composition of the base glass from which the glass-ceramic is made, comprises, in mole percent on an oxide basis:

[0187] SiO2 35.00% to 50.00%, Al2O3 20.00% to 35.00%, ZrO2 3.00% to 5.00%, MgO 4.00% to 7.00%, ZnO 9.00% to 12.00%, Na2O 2.00% to 10.00%, Li2O 2.00% to 10.00%, BaO 0.00% to 5.00%, La2O3 0.00% to 1.80%, and Y2O3 0.00% to 0.50%. It should be understood that in the specific embodiments, any of the above ranges can be combined with any other range, as long as the glass-ceramic or strengthened glass-ceramic with the desired properties of the present application can be obtained. In the present application, by adding La2O3 and / or Y2O3 in the glass composition formula of high-aluminum and high-zirconium glass which can produce glass-ceramics with spinel as the main crystalline phase (or also known as spinel glass-ceramics), while the content of each component meets the specific requirements, and the crystalline phase composition of the glass-ceramics meets the specific content relationship, the strength performance of the glass-ceramics is better improved while ensuring excellent optical performance of the glass-ceramics, and thus the glass-ceramics with spinel crystalline phase as the main crystalline phase can be chemically strengthened to obtain a strengthened glass-ceramic with excellent compressive strength and excellent deformation resistance.

[0188] In the present application, SiO2 is a network-forming oxide of glass, which is an indispensable component of the glass network structure. An appropriate amount of SiO2 can increase the stability and mechanical strength of the glass, but excessive SiO2 will increase the viscosity of the base glass, making it difficult to melt the glass, thereby reducing the formability of the base glass. In the present application, the molar percentage of SiO2 in the composition of the glass-ceramic or the base glass for preparing the glass-ceramic or the composition of the central portion or the tensile stress layer of the strengthened glass-ceramic prepared from the glass-ceramic is 35.00% to 50.00%, preferably 40.00% to 48.00%, and more preferably 42.00% to 46.00%.

[0189] In some embodiments of the application, the composition of the glass-ceramic, or the composition of the base glass from which the glass-ceramic is made, or the composition at the center of the strengthened glass-ceramic made from the glass-ceramic, or the composition of the compressive stress layer, can have a content of Si02, in mole percent of oxide, of 35.00%, 35.50%, 36.00%, 36.50%, 37.00%, 37.50%, 38.00%, 38.50%, 39.00%, 39.50%, 40.00%, 40.50%, 41.00%, 41.50%, 42.00%, 42.50%, 43.00%, 43.50%, 44.00%, 44.50%, 45.00%, 45.50%, 46.00%, 46.50%, 47.00%, 47.50%, 48.00%, 48.50%, 49.00%, 49.50%, 50.00%, 45.22%, 45.09%, 44.95%, 44.77%, 44.64%, 45.18%, 45.13%, 44.99%, 44.86%, 44.69%, 44.73%, 44.29%, 43.95%, 44.33%, 44.03%, 43.91%, 45.66%, 45.39%, 45.07%, 45.57%, 45.43%, 45.30%, 45.16%, 45.52%, 44.72%, 44.76%, 42.34%, or 44.04%, or a value within a range bounded by any two of the foregoing specific values, as appropriate, to produce a glass-ceramic or strengthened glass-ceramic having the properties desired in the application. It is to be understood that any of the foregoing ranges can be combined with any other range, as appropriate, to produce a glass-ceramic or strengthened glass-ceramic having the properties desired in the application.

[0190] In the present application, Al2O3 is one of the components of the substrate glass which forms the main crystal phase of (Zn, Mg) Al2O4 after crystallization, and the increase of Al2O3 can promote the precipitation of spinel and inhibit the precipitation of other impurities such as quartz, which will directly affect the content of the main crystal phase (Zn, Mg) Al2O4. With the increase of the content of Al2O3, the strength of the glass phase in the glass-ceramic is also enhanced, and the mechanical properties of the glass-ceramic are enhanced. At the same time, since the volume of [AlO4] is larger than that of [SiO4], it can provide more space for ion exchange, which is beneficial to promote the chemical strengthening. However, excessive Al2O3 will increase the viscosity of the substrate glass, which will reduce the formability of the substrate glass, and at the same time, it will easily lead to the rapid crystallization rate, which will cause the substrate glass to devitrify during the normal cooling process. In the present application, the molar percentage of Al2O3 in the composition of the glass-ceramic or the substrate glass for preparing the glass-ceramic or the composition of the strengthened glass-ceramic prepared from the glass-ceramic at the center or the composition of the tensile stress layer is 20.00% to 35.00%, preferably 24.00% to 30.00%, and more preferably 25.00% to 28.00%.

[0191] In some embodiments of the application, the content of Al2O3 in the composition of the glass-ceramic, or in the composition of the base glass from which the glass-ceramic is made, or in the composition of the strengthened glass-ceramic made from the glass-ceramic, at the center of the glass-ceramic or in the composition of the tensile stress layer, can be 20.00%, 20.50%, 21.00%, 21.50%, 22.00%, 22.50%, 23.00%, 23.50%, 24.00%, 24.50%, 25.00%, 25.50%, 26.00%, 26.50%, 27.00%, 27.50%, 28.00%, 28.50%, 29.00%, 29.50%, 30.00%, 30.50%, 31.00%, 31.50%, 32.00%, 32.50%, 33.00%, 33.50%, 34.00%, 34.50%, 35.00%, 25.75%, 25.67%, 25.60%, 25.49%, 25.42%, 25.72%, 25.70%, 25.62%, 25.54%, 25.44%, 25.47%, 25.22%, 25.02%, 25.24%, 25.07%, 25.00%, 26.99%, 26.83%, 26.64%, 26.93%, 26.85%, 26.77%, 26.67%, 26.69%, 26.91%, 26.42%, 26.00%, 25.48%, 27.23%, or 27.44%, or a value within a range of any two of the above specific values, as long as a glass-ceramic or strengthened glass-ceramic with the desired properties of the 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 strengthened glass-ceramic with the desired properties of the application is obtained.

[0192] In the present application, Zr02 is an effective nucleating agent. During the heat treatment of the glass, Zr02 is precipitated in the form of crystals, and the Zr02 crystals become nuclei for the growth of subsequent crystals. Within a certain range of glass compositions, the content of Zr02 affects the formation of the glass, the crystal shape, the crystal type, and the crystal size of the glass-ceramic obtained after heat treatment of the glass, etc. By adjusting the composition of the glass, Zr02 can be precipitated preferentially at the same temperature, followed by the growth of the main crystal phase spinel crystals. When the content of Zr02 is too low, it will affect the precipitation of the main crystal phase zinc-magnesium spinel crystal phase; when the content of Zr02 is too high, it will result in a large difficulty in melting the base glass, and white unmelted substances will be produced in the base glass. In the present application, the molar percentage of Zr02 in the composition of the glass-ceramic or the base glass for preparing the glass-ceramic or the composition of the center or the tensile stress layer of the strengthened glass-ceramic prepared from the glass-ceramic is 3.00% to 5.00%, preferably 3.00% to 4.00%, and more preferably 3.10% to 3.70%.

[0193] In some embodiments of the present application, the content of Zr02 in the composition of the glass-ceramic or the base glass for preparing the glass-ceramic or the composition of the center or the tensile stress layer of the strengthened glass-ceramic prepared from the glass-ceramic, in terms of the molar percentage of oxides, can be 3.00%, 3.20%, 3.50%, 3.70%, 4.00%, 4.20%, 4.50%, 4.70%, 5.00%, 3.38%, 3.37%, 3.36%, 3.35%, 3.34%, 3.32%, 3.29%, 3.28%, 3.41%, 3.39%, 3.40%, 3.42%, 3.49%, or 3.55%, or a value within a range formed by any two of the above specific values as endpoints, as long as a glass-ceramic or a 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 strengthened glass-ceramic with the desired properties of the present application can be obtained.

[0194] In the present application, ZnO provides the zinc necessary for the formation of the main crystalline phase of the zinc aluminate-magnesium aluminate spinel solid solution crystalline phase after crystallization of the base glass. ZnO can reduce the thermal expansion coefficient of the glass, improve the chemical stability, thermal stability and refractive index of the glass. MgO provides the magnesium necessary for the formation of the main crystalline phase of the zinc aluminate-magnesium aluminate spinel solid solution crystalline phase after crystallization of the base glass. MgO can slow down the hardening speed of the glass, improve the forming performance of the glass; MgO can also reduce the crystallization tendency and crystallization speed, increase the high temperature viscosity of the glass, and improve the chemical stability and mechanical strength of the glass. However, the addition of excessive MgO and ZnO tends to easily lead to excessively large spinel grains, and it is difficult to obtain a glass-ceramic with high transparency. In the present application, the molar percentage of ZnO in the composition of the glass-ceramic or the base glass for preparing the glass-ceramic or the composition of the center or the tensile stress layer of the strengthened glass-ceramic prepared from the glass-ceramic is 9.00% to 12.00%, preferably 9.00% to 11.00%, more preferably 9.00% to 10.50%; the molar percentage of MgO is 4.00% to 7.00%, preferably 5.00% to 6.00%, more preferably 5.20% to 5.90%.

[0195] In some embodiments of the present application, the content of ZnO in the composition of the glass-ceramic or the base glass for preparing the glass-ceramic or the composition of the center or the tensile stress layer of the strengthened glass-ceramic prepared from the glass-ceramic can be 9.00%, 10.00%, 11.00%, 12.00%, 10.50%, 9.50%, 9.69%, 9.66%, 9.63%, 9.59%, 9.57%, 9.68%, 9.67%, 9.64%, 9.61%, 9.58%, 9.49%, 9.42%, 9.50%, 9.44%, 9.41%, 9.78%, 9.72%, 9.76%, 9.73%, 9.70%, 9.75%, 9.92% or 10.08%, or can be a value within the numerical range formed by any two of the above specific numerical values as endpoints, as long as a glass-ceramic or a strengthened glass-ceramic with the required 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 strengthened glass-ceramic with the required properties of the present application can be obtained.

[0196] In some embodiments of the present application, the content of MgO in the composition of the glass-ceramic, or the composition of the base glass for making the glass-ceramic, or the composition of the strengthened glass-ceramic made from the glass-ceramic, at the center or the composition of the tensile stress layer, can be 4.00%, 4.50%, 5.00%, 5.50%, 6.00%, 6.50%, 7.00%, 5.46%, 5.44%, 5.43%, 5.41%, 5.39%, 5.45%, 5.42%, 5.40%, 5.35%, 5.31%, 5.32%, 5.30%, 5.51%, 5.48%, 5.50%, 5.49%, 5.78%, or 5.87%, or a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or strengthened glass-ceramic with 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 strengthened glass-ceramic with desired properties of the present application can be obtained.

[0197] In the present application, the increase of Na2O content helps to obtain higher surface compressive stress, while the melting temperature and the temperature of crystal precipitation can be reduced. However, excessive addition of Na2O can cause the glass to be ceramized during annealing, or cause other impurity phases to precipitate during heat treatment, which affects the transmittance of the glass-ceramic, resulting in a glass-ceramic with low transmittance. Too low addition of Na2O can cause the heat treatment temperature to increase, and directly cause phase separation or impurity phase precipitation during heat treatment, resulting in a glass-ceramic with poor transparency. In the present application, the molar percentage of Na2O in the composition of the glass-ceramic, or the composition of the base glass for making the glass-ceramic, or the composition of the strengthened glass-ceramic made from the glass-ceramic, at the center or the tensile stress layer, is 2.00% to 10.00%, preferably 3.00% to 8.00%, and more preferably 3.00% to 6.00%.

[0198] In some embodiments of the present application, the content of Na2O in the composition of the glass-ceramic, or the composition of the base glass for making the glass-ceramic, or the composition of the center or the composition of the tensile stress layer of the strengthened glass-ceramic made of the glass-ceramic, can be 2.00%, 2.50%, 3.00%, 3.50%, 4.00%, 4.50%, 5.00%, 5.50%, 6.00%, 6.50%, 7.00%, 7.50%, 8.00%, 8.50%, 9.00%, 9.50%, 10.00%, 3.38%, 3.37%, 3.36%, 3.35%, 3.34%, 3.31%, 3.29%, 3.32%, 3.28%, 3.42%, 3.40%, 3.41%, 3.39%, 3.54%, or 3.60% in terms of mole percent of oxide, or can be a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or a strengthened glass-ceramic with 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 strengthened glass-ceramic with desired properties of the present application can be obtained.

[0199] In the present application, Li2O helps to obtain higher compressive stress layer depth and increase Young's modulus; meanwhile, it can reduce the melting temperature and the temperature of crystal precipitation, but excessive addition of Li2O can lead to ceramming of the glass during annealing, or lead to precipitation of other phases affecting the transmittance of the glass-ceramic during heat treatment, or lead to excessive growth of crystals during heat treatment, resulting in a decrease in the transmittance of the obtained glass-ceramic. Too low addition of Li2O can lead to an increase in the heat treatment temperature and a decrease in the deep layer stress. In addition, the amorphous glass and the glass-ceramic containing Li2O have a relatively large fracture toughness value and are not prone to breaking. In the present application, the mole percent of Li2O in the composition of the glass-ceramic, or the composition of the base glass for making the glass-ceramic, or the composition of the center or the composition of the tensile stress layer of the strengthened glass-ceramic made of the glass-ceramic is 2.00% to 10.00%, preferably 3.00% to 9.00%, and more preferably 3.50% to 8.00%.

[0200] In some embodiments of the present application, the content of Li20 in the composition of the glass-ceramic, or the composition of the base glass for making the glass-ceramic, or the composition of the strengthened glass-ceramic made from the glass-ceramic, at the center or the composition of the tensile stress layer, in mole percent of oxide, can be 2.00%, 2.50%, 3.00%, 3.50%, 4.00%, 4.50%, 5.00%, 5.50%, 6.00%, 6.50%, 7.00%, 7.50%, 8.00%, 8.50%, 9.00%, 9.50%, 10.00%, 5.76%, 5.74%, 5.73%, 5.70%, 5.68%, 5.75%, 5.71%, 5.69%, 5.64%, 5.60%, 5.65%, 5.61%, 5.59%, 3.86%, 3.84%, 3.81%, 3.85%, 3.83%, 3.82%, 3.79%, 5.81%, 7.67%, or 3.90%, or a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or strengthened glass-ceramic with 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 strengthened glass-ceramic with desired properties of the present application can be obtained.

[0201] In the present application, BaO is an optional component. An appropriate amount of BaO is beneficial to improve the melting effect of the glass, increase the density of the glass, improve the Young's modulus, and to a certain extent, inhibit the growth of the crystal grains and improve the optical properties of the glass-ceramic. However, too much BaO has a strong inhibitory effect on the exchange process of Na ions and K ions. In the present application, the mole percent of BaO in the composition of the glass-ceramic, or the composition of the base glass for making the glass-ceramic, or the composition of the strengthened glass-ceramic made from the glass-ceramic, at the center or the tensile stress layer, is 0.00% to 5.00%, preferably 0% to 4.00%, and more preferably 0% to 3.50%.

[0202] In some embodiments of the present application, the content of BaO in the composition of the glass-ceramic, or the composition of the base glass from which the glass-ceramic is made, or the composition of the center or the tensile stress layer of the strengthened glass-ceramic made from the glass-ceramic, can be 0%, 0.50%, 1.00%, 1.50%, 2.00%, 2.50%, 3.00%, 3.50%, 4.00%, 4.50%, 5.00%, 1.16%, 1.15%, 1.14%, 2.11%, 3.45%, 2.31%, 3.46%, 1.17%, 2.13%, or 1.12% in terms of mass percentage of oxide, or can be a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or strengthened glass-ceramic with 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 strengthened glass-ceramic with desired properties of the present application can be obtained.

[0203] In the present application, La2O3 is a network modifier component of the glass. The addition of an appropriate amount of La2O3 is beneficial to increasing the refractive index of the glass, reducing the high-temperature viscosity of the glass, improving the glass melting effect, and eliminating internal defects. At the same time, the addition of an appropriate amount of La2O3 can significantly improve the Young's modulus and Vickers hardness of the glass, and also has the effect of improving the chemical strengthening performance of the glass-ceramic and increasing the stress effect per ion exchange of the strengthened glass-ceramic. However, too much La2O3 is not conducive to obtaining a transparent glass-ceramic. In the present application, the mole percentage of La2O3 in the composition of the glass-ceramic, or the composition of the base glass from which the glass-ceramic is made, or the composition of the center or the tensile stress layer of the strengthened glass-ceramic made from the glass-ceramic, is 0.00% to 1.80%, preferably 0% to 1.70%, and more preferably 0% to 1.60%.

[0204] In some embodiments of the present application, the content of La2O3 in the composition of the glass-ceramic, or the composition of the base glass for making the glass-ceramic, or the composition at the center or the composition of the tensile stress layer of the strengthened glass-ceramic made of the glass-ceramic, can be 0%, 0.10%, 0.20%, 0.30%, 0.40%, 0.50%, 0.60%, 0.70%, 0.80%, 0.90%, 1.00%, 1.10%, 1.20%, 1.50%, 1.60%, 1.70%, 1.80%, 0.79%, 1.19%, 1.48%, 1.18%, 0.78%, 0.48% or 0.49% in terms of mole percent of oxide, or can be a value within a range between any two of the above-mentioned specific values as endpoints, as long as a glass-ceramic or a strengthened glass-ceramic with desired properties 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 glass-ceramic or a strengthened glass-ceramic with desired properties of the present application can be obtained.

[0205] In the present application, Y2O3 has the effect of making the glass structure compact, and adding an appropriate amount of Y2O3 can improve the packing density inside the glass, which is manifested as an increase in the density of the glass, thereby facilitating the improvement of the intrinsic strength of the glass. For ion exchange performance, it can improve the stress effect per unit ion exchange of the ions in the chemical strengthening process, but can reduce the exchange speed. However, too much Y2O3 is not conducive to obtaining transparent glass-ceramics. In the present application, the mole percent of Y2O3 in the composition of the glass-ceramic, or the composition of the base glass for making the glass-ceramic, or the composition at the center or the composition of the tensile stress layer of the strengthened glass-ceramic made of the glass-ceramic is 0.00% to 0.50%, preferably 0% to 0.40%, and more preferably 0% to 0.30%. + + In the present application, Y2O3 has the effect of making the glass structure compact, and adding an appropriate amount of Y2O3 can improve the packing density inside the glass, which is manifested as an increase in the density of the glass, thereby facilitating the improvement of the intrinsic strength of the glass. For ion exchange performance, it can improve the stress effect per unit ion exchange of the ions in the chemical strengthening process, but can reduce the exchange speed. However, too much Y2O3 is not conducive to obtaining transparent glass-ceramics. In the present application, the mole percent of Y2O3 in the composition of the glass-ceramic, or the composition of the base glass for making the glass-ceramic, or the composition at the center or the composition of the tensile stress layer of the strengthened glass-ceramic made of the glass-ceramic is 0.00% to 0.50%, preferably 0% to 0.40%, and more preferably 0% to 0.30%.

[0206] In some embodiments of the present application, the content of Y2O3 in the composition of the glass-ceramic, or the composition of the base glass for making the glass-ceramic, or the composition at the center or the composition of the tensile stress layer of the strengthened glass-ceramic made of the glass-ceramic, can be 0%, 0.10%, 0.20%, 0.30%, 0.40%, 0.50%, 0.49% or 0.19% in terms of mole percent of oxide, or can be a value within a range between any two of the above-mentioned specific values as endpoints, as long as a glass-ceramic or a strengthened glass-ceramic with desired properties 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 glass-ceramic or a strengthened glass-ceramic with desired properties of the present application can be obtained.

[0207] ​In the present application, in addition to the aforementioned components, other optional components such as CaO, B2O3, or K2O, etc. can be added to the composition of the glass-ceramic, the composition of the base glass for preparing the glass-ceramic, or the composition of the central portion or the tensile stress layer of the strengthened glass-ceramic prepared from the glass-ceramic, according to other performance requirements.

[0208] In the present application, the addition of an appropriate amount of CaO is beneficial to reduce the viscosity of the glass, improve the formability, strain point, and Young's modulus of the glass, and can improve the ion exchange ability. At the same time, calcium oxide can also increase the gloss and transparency of the glass, reduce the crystallization tendency of the glass, and slow down the hardening speed of the glass. However, the addition of too much CaO will cause the density and CTE of the glass composition to increase, and the ion exchange performance to decrease significantly. Preferably, in some embodiments of the present application, the molar percentage of CaO in the composition of the glass-ceramic, the composition of the base glass for preparing the glass-ceramic, or the composition of the central portion or the tensile stress layer of the strengthened glass-ceramic prepared from the glass-ceramic is 0% to 6.00%, preferably 0% to 3.00%, and more preferably 0% to 1.50%.

[0209] In the present application, the addition of an appropriate amount of B2O3 is beneficial to reduce the melting difficulty of the glass and promote the precipitation of the main crystal phase spinel. However, the addition of excessive B2O3 will cause the base glass to easily appear cloudy during heat treatment, and can also cause other crystal phases to precipitate, which seriously affects the transparency of the glass. In the present application, the molar percentage of B2O3 in the composition of the glass-ceramic, the composition of the base glass for preparing the glass-ceramic, or the composition of the central portion or the tensile stress layer of the strengthened glass-ceramic prepared from the glass-ceramic is 0% to 10.00%, preferably 0% to 8.00%, and more preferably 0% to 4.00%.

[0210] In some embodiments, the composition of the glass-ceramic, the composition of the base glass for preparing the glass-ceramic, or the composition of the central portion or the tensile stress layer of the strengthened glass-ceramic prepared from the glass-ceramic does not contain CaO and / or B2O3.

[0211] In some embodiments of the present application, the addition of P2O5 can easily affect the optical performance of the glass-ceramic or the strengthened glass-ceramic, and the addition of TiO2 can easily cause the glass-ceramic or the strengthened glass-ceramic to exhibit an undesirable color. Therefore, it is preferable that the glass-ceramic or the strengthened glass-ceramic of the present application does not contain P2O5 and / or TiO2.

[0212] In some embodiments of the present application, the molar percentage of La2O3 [La2O3] and the molar percentage of Y2O3 [Y2O3] in the composition of the glass-ceramic, the composition of the base glass for preparing the glass-ceramic, or the composition of the central portion or the tensile stress layer of the strengthened glass-ceramic made of the glass-ceramic satisfy the following relationship: [La2O3] + [Y2O3] > 0.01%, preferably, [La2O3] + [Y2O3] ≥ 0.15%. In some embodiments, the value of [La2O3] + [Y2O3] can be 0.20% to 1.50%, 0.20% to 0.50%, 0.50% to 1.50%, or 0.30% to 0.60% in the composition of the glass-ceramic, the composition of the base glass for preparing the glass-ceramic, or the composition of the central portion or the tensile stress layer of the strengthened glass-ceramic made of the glass-ceramic. In the present application, by optimizing the content of La2O3 and Y2O3, the strength performance of the glass-ceramic is improved, thereby facilitating the preparation of a strengthened glass-ceramic with excellent compressive strength and excellent deformation resistance.

[0213] In the present application, by satisfying the specific molar content relationship of La2O3, Y2O3 and BaO, it is more conducive to obtaining a glass-ceramic material with spinel crystal phase as the main crystal phase, which is transparent and has improved optical performance.

[0214] In some embodiments of the present application, the molar percentage of La2O3 [La2O3] and the molar percentage of Y2O3 [Y2O3] in the composition of the glass-ceramic, the composition of the base glass for preparing the glass-ceramic, or the composition of the central portion or the tensile stress layer of the strengthened glass-ceramic made of the glass-ceramic satisfy the following relationship:

[0215] A = 3 × [La2O3] × 100 + 5 × [Y2O3] × 100, 0.10 ≤ A ≤ 5.00, preferably, 0.50 ≤ A ≤ 5.00, more preferably, 0.50 ≤ A ≤ 3.50.

[0216] In some embodiments, the value of the relationship A can be 0.10, 0.50, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00, 0.60, 2.37, 3.57, 4.44, 1.60, 3.37, 4.54, 4.82, 4.79, 2.39, 3.34, 1.47, 2.34 or 3.10, 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 glass-ceramic or a 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 glass-ceramic or a strengthened glass-ceramic with the required performance of the present application can be obtained.

[0217] In some embodiments of the application, the molar percentage of BaO [BaO] in the composition of the glass-ceramic, or in the composition of the base glass from which the glass-ceramic is made, or in the composition of the strengthened glass-ceramic made from the glass-ceramic, at the center or in the compressive stress layer, satisfies the following relationship: B = [BaO] x 100 x (([BaO] x 100 - 2.7) 2 -0.09), 0 < B < 5.50, preferably, 0 < B < 3.00, more preferably, 0 < B < 2.8.

[0218] In some embodiments, the value of the relationship B can be 0, 0.50, 1.00, 1.50, 2.00, 2.50, 3.00, 2.65, 2.66, 2.67, 0.54, 1.63, 0.14, 1.69, 2.63, or 2.70, or can be a value within a range of values defined by any two of the above specific values as endpoints, as long as a glass-ceramic or strengthened glass-ceramic having the desired properties of the 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 strengthened glass-ceramic having the desired properties of the application is obtained.

[0219] In some embodiments of the application, the molar percentage of BaO [BaO] in the composition of the glass-ceramic, or in the composition of the base glass from which the glass-ceramic is made, or in the composition of the strengthened glass-ceramic made from the glass-ceramic, at the center or in the compressive stress layer, satisfies the following relationship: B = [BaO] x 100 x (([BaO] x 100 - 2.7) 2 -0.09), 0 < B < 5.50, preferably, 0 < B < 3.00, more preferably, 0 < B < 2.8.

[0220] In some embodiments, the value of the relationship C can be 0.10, 0.50, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 6.50, 7.00, 7.50, 7.90, 3.25, 4.15, 5.03, 6.23, 7.11, 3.65, 4.25, 5.16, 6.03, 7.21, 6.66, 7.49, 5.33, 4.02, 3.48, 3.16, 3.97, 3.23, 5.02, 7.10, 5.15, 6.02, 7.20, 5.75, 6.65, 7.47, 3.63, 4.65, 5.13, 5.32, 1.60, 3.29, or 4.30, or can be a value within a range of any two of the above specific values as endpoints, as long as a glass-ceramic or strengthened glass-ceramic having 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 strengthened glass-ceramic having the desired properties of the present application is obtained.

[0221] In the present application, by satisfying the specific molar content relationships of La2O3, Y2O3, BaO, and Al2O3, the optical properties of the glass-ceramic having spinel as the main crystalline phase and containing lanthanum and / or yttrium are more favorably improved.

[0222] In some embodiments of the present application, the molar percentage of La2O3 [La2O3], the molar percentage of Y2O3 [Y2O3], the molar percentage of BaO [BaO], and the molar percentage of Al2O3 [Al2O3] in the composition of the glass-ceramic, the composition of the base glass from which the glass-ceramic is prepared, or the composition of the central portion or the compressive stress layer of the strengthened glass-ceramic prepared from the glass-ceramic satisfy the following relationship:

[0223] D = (exp([La2O3] x 100 - 2.1) + exp([Y2O3] x 100 - 0.45)) / (0.5 + exp([BaO] x 100 - 4.0)) + exp([Al2O3] x 100 - 30.0), and the value of D is 0.50 ≤ D ≤ 2.50, preferably 0.70 ≤ D ≤ 2.40, and more preferably 0.80 ≤ D ≤ 2.00.

[0224] In some embodiments, the value of relationship D can be 0.50, 1.00, 1.50, 2.00, 2.50, 1.42, 1.52, 1.64, 1.88, 2.12, 1.63, 1.77, 1.68, 1.89, 2.26, 2.36, 2.02, 0.91, 1.54, 0.78, 0.85, 1.46, 1.67, 2.14, 1.71, 1.80, 1.92, 2.15, 2.19, 2.28, 2.38, 1.66, 1.97, 2.03, 1.81, 0.92, or 1.75, or a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or strengthened glass-ceramic having 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 strengthened glass-ceramic having the desired properties of the present application is obtained.

[0225] In the present application, by satisfying specific requirements for the molar contents of Li2O, Na2O, ZrO2, BaO, Al2O3, MgO, ZnO, and SiO2, it is more advantageous to obtain a strengthened glass-ceramic having excellent deformation resistance after the addition of lanthanum and / or yttrium.

[0226] In some embodiments of the present application, the molar percentage of Li2O [Li2O], the molar percentage of Na2O [Na2O], the molar percentage of ZrO2 [ZrO2], the molar percentage of BaO [BaO], the molar percentage of Al2O3 [Al2O3], the molar percentage of MgO [MgO], the molar percentage of ZnO [ZnO], and the molar percentage of SiO2 [SiO2] in the composition of the glass-ceramic or the base material glass for preparing the glass-ceramic or the composition of the strengthened glass-ceramic obtained from the glass-ceramic at the center or the compressive stress layer satisfy the following relationship:

[0227] M = ([Li2O] + 2.00 x [Na2O] + 2.00 x [ZrO2] + 0.50 x [BaO] + 6.32 x ([Al2O3] - ([MgO] + [ZnO]))) / ([SiO2] + [MgO] + [ZnO]), M ≥ 1.00, preferably, 1.20 ≤ M ≤ 1.7, more preferably, 1.35 ≤ M ≤ 1.60.

[0228] In some embodiments, the value of the relationship M can be 1.00, 1.20, 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 1.90, 2.00, 1.44, 1.45, 1.46, 1.51, 1.52, 1.43, or 1.59, or can be a value within a range of values defined between any two of the above particular values as endpoints, as long as a glass-ceramic or strengthened glass-ceramic having the desired properties of the present application is obtained. It is understood that in particular embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or strengthened glass-ceramic having the desired properties of the present application is obtained.

[0229] In some embodiments of the present application, the molar percent of La2O3 [La2O3], the molar percent of Y2O3 [Y2O3], the molar percent of Li2O [Li2O], the molar percent of Na2O [Na2O], the molar percent of ZrO2 [ZrO2], the molar percent of BaO [BaO], the molar percent of Al2O3 [Al2O3], the molar percent of MgO [MgO], the molar percent of ZnO [ZnO], and the molar percent of SiO2 [SiO2] in the composition of the glass-ceramic or the composition of the base glass from which the glass-ceramic is made or the composition of the strengthened glass-ceramic made from the glass-ceramic at the center or the composition of the compressive stress layer satisfy the following relationship:

[0230] P = M / exp((N - 14) x 0.5) = (([Li2O] + 2.00 x [Na2O] + 2.00 x [ZrO2] + 0.50 x [BaO] + 6.32 x ([Al2O3] - ([MgO] + [ZnO])) ) / ([SiO2] + [MgO] + [ZnO])) / exp(((4.5 x [La2O3] x 100 - ln([La2O3] x 100 + 0.001) + 7.85 x [Y2O3] x 100 - ln([Y2O3] x 100 + 0.008) + exp([BaO] x 100 - 2.5) + ln([Li2O] / [Na2O]) + ln([Al2O3] / [ZrO2])) - 14) x 0.5), P > 1.50, preferably, 1.50 < P < 31.0, more preferably, 6.0 < P < 31.0, more preferably, 6.5 < P < 30.5.

[0231] In some embodiments, the value of the relationship P can be 1.50, 2.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 6.50, 7.00, 7.50, 8.00, 8.50, 9.00, 9.50, 10.00, 10.50, 11.00, 11.50, 12.00, 12.50, 13.00, 13.50, 14.00, 14.50, 15.00, 15.50, 16.00, 16.50, 17.00, 17.50, 18.00, 18.50, 19.00, 19.50, 20.00, 20.50, 21.00, 21.50, 22.00, 22.50, 23.00, 23.50, 24.00, 24.50, 25.00, 25.50, 26.00, 26.50, 27.00, 27.50, 28.00, 28.50, 29.00, 29.50, 30.00, 30.50, 31.00, 9.82, 7.90, 5.17, 2.58, 1.50, 2.53, 2.08, 22.82, 18.44, 12.06, 6.11, 8.88, 5.99, 4.95, 6.06, 9.29, 2.50, 1.66, 12.41, 6.54, 1.90, 28.97, 23.30, 15.25, 7.74, 13.95, 11.20, 7.55, 3.19, 2.05, 1.54, 6.12, 24.91, 21.93, 9.68, or 30.27, or a value within a range defined by any two of the foregoing specific numerical values as endpoints, as long as a glass-ceramic or 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 glass-ceramic or strengthened glass-ceramic having the desired properties of the present application is obtained.

[0232] In the present application, in order to obtain a strengthened glass-ceramic having excellent properties as desired in the present application, in addition to Y2O3and La2O3, a metal oxide of cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, or scandium, or a mixture of the foregoing metal oxides, can also be added to the composition of the glass-ceramic or the base glass used to prepare the strengthened glass-ceramic, as long as a glass-ceramic or strengthened glass-ceramic having the desired properties of the present application is obtained. If the foregoing metal oxides are added to the composition of the glass-ceramic or the base glass used to prepare the strengthened glass-ceramic, these metal oxides should also be contained in the composition of the strengthened glass-ceramic at the center or in the compressive stress layer.

[0233] In the present application, by making the content of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase and the zirconia crystal phase meet specific requirements, it is beneficial to make the glass ceramic obtain a specific crystal phase structure, beneficial to play the synergistic effect of the crystal phase structure and the glass phase structure, thereby beneficial to improve the strength performance of the glass ceramic while ensuring that the glass ceramic realizes excellent optical performance, and further beneficial to prepare a strengthened glass ceramic with excellent compression resistance and excellent deformation resistance.

[0234] In some embodiments of the present application, in the glass ceramic or the strengthened glass ceramic prepared therefrom, the mass content W of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase is 20.00% to 50.00%, preferably 24.00% to 45.00%, more preferably 30.00% to 45.00%. [(Zn，Mg)Al2O4] In some embodiments of the present application, in the glass ceramic or the strengthened glass ceramic prepared therefrom, the mass content W of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase is 20.00% to 50.00%, preferably 24.00% to 45.00%, more preferably 30.00% to 45.00%.

[0235] In some embodiments of the present application, in the glass ceramic or the strengthened glass ceramic prepared therefrom, the mass content W of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase is 20.00% to 50.00%, preferably 24.00% to 45.00%, more preferably 30.00% to 45.00%. [(Zn，Mg)Al2O4] may be 20.00%, 21.00%, 22.00%, 23.00%, 24.00%, 25.00%, 26.00%, 27.00%, 28.00%, 29.00%, 30.00%, 31.00%, 32.00%, 33.00%, 34.00%, 35.00%, 36.00%, 37.00%, 38.00%, 39.00%, 40.00%, 41.00%, 42.00%, 43.00%, 44.00%, 45.00%, 46.00%, 47.00%, 48.00%, 49.00%, 50.00%, 37.19%, 33.30%, 32.88%, 33.97%, 32.51%, 33.58%, 30.12%, 37.05%, 34.43%, 29.66%, 27.42%, 32.50%, 25.40%, 26.24%, 31.81%, 28.62%, 33.70%, 29.56%, 37.91%, 35.10%, 26.16%, 32.52%, 31.17%, 31.50%, 24.39%, 24.91%, 24.96%, 24.56%, 29.52%, 27.29%, 25.50%, 26.47%, 34.67%, 32.53%, 33.65%, or 31.16%, or 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 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 glass ceramic or a strengthened glass ceramic with the required performance of the present application can be obtained.

[0236] In the present application, "mainly zinc aluminate-magnesium aluminate spinel solid solution" or "zinc aluminate-magnesium aluminate spinel solid solution as the main crystal phase" or other similar expressions mean that the zinc aluminate-magnesium aluminate spinel solid solution accounts for more than 50% by mass of all the crystal phases of the glass-ceramic or the strengthened glass-ceramic made of the glass-ceramic according to the embodiments of the present application. In some embodiments, the mass of the zinc aluminate-magnesium aluminate spinel solid solution accounts for more than 50% of all the crystal phases of the glass-ceramic or the strengthened glass-ceramic made of the glass-ceramic, preferably, the mass of the zinc aluminate-magnesium aluminate spinel solid solution accounts for more than 70% of all the crystal phases of the glass-ceramic or the strengthened glass-ceramic made of the glass-ceramic. For example, the mass ratio (or also referred to as the weight ratio, the mass percentage, or the weight percentage) of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase in all the crystal phases of the glass-ceramic or the strengthened glass-ceramic made of the glass-ceramic can be 50%, 60%, 70%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, or 90%, or can be a value within a value range formed by any two of the above specific values as the end points, as long as a glass-ceramic or a 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 glass-ceramic or a strengthened glass-ceramic with the required performance of the present application can be obtained.

[0237] In some embodiments of the present application, in the glass-ceramic or the strengthened glass-ceramic made of the glass-ceramic, the mass content W [ZrO2] is 4.00% to 25.00%, preferably 5.00% to 21.00%, and more preferably 5.00% to 16.00%.

[0238] In some embodiments, the mass content W [ZrO2]may be 4.00%, 5.00%, 6.00%, 7.00%, 8.00%, 9.00%, 10.00%, 11.00%, 12.00%, 13.00%, 14.00%, 15.00%, 16.00%, 17.00%, 18.00%, 19.00%, 20.00%, 21.00%, 22.00%, 23.00%, 24.00%, 25.00%, 12.28%, 15.19%, 14.85%, 14.82%, 14.75%, 14.77%, 17.94%, 12.02%, 13.06%, 15.83%, 20.43%, 15.57%, 19.81%, 19.08%, 16.17%, 17.62%, 14.51%, 16.45%, 8.60%, 17.96%, 13.35%, 13.36%, 15.10%, 18.70%, 19.01%, 19.51%, 20.00%, 16.18%, 18.88%, 19.71%, 19.25%, 14.45%, 15.21%, or 12.67%, or a value within a range defined by any two of the specifically named values as endpoints, as long as a glass-ceramic or strengthened glass-ceramic having the desired properties of the present application is obtained. It is understood that any of the above ranges can be combined with any other range, as long as a glass-ceramic or strengthened glass-ceramic having the desired properties of the present application is obtained.

[0239] In some embodiments of the present application, the mass fraction of the zirconia crystal phase in all crystal phases of the glass-ceramic or the strengthened glass-ceramic made therefrom is 10.00% to 45.00%, preferably 10.00% to 35.00%.

[0240] In some embodiments, the mass fraction of the zirconia crystal phase in all crystal phases of the glass-ceramic or the strengthened glass-ceramic made therefrom can be 10.00%, 11.00%, 12.00%, 15.00%, 18.00%, 19.00%, 20.00%, 21.00%, 22.00%, 23.00%, 24.00%, 25.00%, 26.00%, 27.00%, 28.00%, 29.00%, 30.00%, 31.00%, 32.00%, 33.00%, 34.00%, 35.00%, 36.00%, 37.00%, 38.00%, 39.00%, 40.00%, 41.00%, 42.00%, 43.00%, 44.00%, 45.00%, 24.82%, 31.33%, 31.11%, 30.38%, 31.21%, 30.54%, 37.33%, 24.50%, 27.50%, 34.80%, 42.70%, 32.40%, 43.82%, 42.10%, 33.70%, 38.10%, 30.10%, 35.75%, 18.50%, 25.50%, 40.70%, 29.10%, 30.00%, 43.40%, 43.29%, 43.87%, 44.88%, 35.40%, 40.90%, 43.60%, 30.03%, 31.86%, 29.25%, or 29.99%, 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 strengthened glass-ceramic having 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 a strengthened glass-ceramic having the desired properties of the present application is obtained.

[0241] In some embodiments of the present application, the glass-ceramic is transparent in the visible wavelength range, preferably, the transmittance of the glass-ceramic at a wavelength of 550 nm is ≥ 85.00% at a thickness of 0.90 mm. The glass-ceramic or the strengthened glass-ceramic made therefrom satisfying the transmittance can ensure good light transmittance, good transparency, and is suitable for use in display screens that require display effects. The "visible wavelength range" herein refers to light having a wavelength of 360 nm-740 nm.

[0242] In the present application, the transmittance of the glass-ceramic before and after chemical strengthening is also substantially the same as the transmittance of the strengthened glass-ceramic, as shown in FIG. 8. That is, in the present application, by using a glass-ceramic having a high transmittance, a strengthened glass-ceramic article having the same excellent transmittance can be obtained by chemical strengthening treatment. In the present application, the strengthened glass-ceramic made from the glass-ceramic having the aforementioned transmittance is also transparent in the visible light wavelength range, preferably, the transmittance of the strengthened glass-ceramic at a wavelength of 550 nm is ≥ 85.00% at a thickness of 0.90 mm.

[0243] In some embodiments, the transmittance of the glass-ceramic or the strengthened glass-ceramic made therefrom at a wavelength of 550 nm can be 85.00%, 85.50%, 86.00%, 86.50%, 87.00%, 87.50%, 88.00%, 88.50%, 89.50%, 90.00%, 90.50%, 91.00%, 92.00%, 89.86%, 89.22%, 89.13%, 88.98%, 88.05%, 89.05%, 88.62%, 89.83%, 88.22%, 86.41%, 86.01%, 85.91%, 87.55%, 88.95%, 89.41%, 89.51%, 89.65%, 89.14%, 86.55%, 89.69%, 89.03%, 88.01%, 86.27%, 86.13%, 85.28%, 85.15%, 89.00%, 85.02%, 88.54%, 89.01%, 88.65%, 89.89%, or 89.37% at a thickness of 0.90 mm, or can be a value within a numerical range constituted by any two of the above specific numerical values as endpoints, as long as a glass-ceramic or a strengthened glass-ceramic 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 a glass-ceramic or a strengthened glass-ceramic having the desired properties of the present application can be obtained.

[0244] In the present application, by making the glass-ceramic satisfy the desired total content of crystalline phases / crystallinity, the appropriate average grain size, it is beneficial to make the glass-ceramic maintain excellent optical properties while satisfying excellent mechanical strength properties and high intrinsic strength. By using the glass-ceramic, a strengthened glass-ceramic having excellent optical properties and excellent mechanical strength properties can be prepared.

[0245] In some embodiments of the present application, the average grain size in the glass-ceramic or the strengthened glass-ceramic made therefrom is not more than 20 nm, preferably 3.0 nm to 10.0 nm, and more preferably 5.0 nm to 10.0 nm. A suitable average grain size is beneficial to make the glass-ceramic have both excellent optical properties and high intrinsic strength, while if the average grain size is too high, the glass-ceramic is prone to devitrification, and the chemical strengthening effect is also affected. In the present application, by making the glass-ceramic satisfy a suitable average grain size, it is beneficial to make the glass-ceramic, while satisfying better mechanical strength performance (such as compression resistance and deformation resistance) and high intrinsic strength, ensure that the glass-ceramic has excellent optical properties, and at the same time, it is beneficial to improve the chemical strengthening effect.

[0246] In some embodiments, the average grain size in the glass-ceramic or the strengthened glass-ceramic made therefrom can be 3.0 nm, 4.5 nm, 5.0 nm, 6.0 nm, 7.0 nm, 8.0 nm, 9.0 nm, 10.0 nm, 5.6 nm, 6.0 nm, 6.4 nm, 8.4 nm, 9.6 nm, 5.4 nm, 7.1 nm, 5.2 nm, 8.8 nm, 7.2 nm, 9.1 nm, 9.5 nm, 8.1 nm, 6.9 nm, 8.2 nm, 6.8 nm, 6.2 nm, 8.9 nm, 7.5 nm, 5.9 nm, 9.0 nm, 9.3 nm, 7.4 nm, 9.9 nm, or 7.0 nm, or can be a value within a value range constituted by any two of the above specific values as end points, as long as a glass-ceramic or a strengthened glass-ceramic having the required 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 strengthened glass-ceramic having the required properties of the present application can be obtained.

[0247] In some embodiments of the present application, the total content of crystalline phase in the glass-ceramic or the strengthened glass-ceramic made therefrom is 30% to 55%, preferably 35% to 55%, and more preferably 40% to 55% by mass. The higher the total content of crystalline phase of the glass-ceramic or the strengthened glass-ceramic, the more beneficial it is for the glass-ceramic or the strengthened glass-ceramic to obtain high mechanical strength performance and high intrinsic strength. However, if the total content of crystalline phase is too high, not only will it affect the chemical strengthening effect of the glass-ceramic, prolonging the chemical strengthening time for obtaining a strengthened glass-ceramic with high stress level, but also it will affect the optical properties of the glass-ceramic. In the present application, by making the glass-ceramic satisfy the desired total content of crystalline phase, it is beneficial to make the glass-ceramic, while satisfying better mechanical strength performance and high intrinsic strength, ensure that the glass-ceramic has excellent optical properties, and at the same time, it is beneficial to improve the chemical strengthening effect.

[0248] In some embodiments, the glass-ceramic or strengthened glass-ceramic made therefrom has a total crystalline phase content of 30.00%, 31.00%, 32.00%, 33.00%, 34.00%, 35.00%, 36.00%, 37.00%, 38.00%, 39.00%, 40.00%, 41.00%, 42.00%, 43.00%, 44.00%, 45.00%, 46.00%, 47.00%, 48.00%, 49.00%, 50.00%, 55.00%, 49.47%, 48.49%, 47.73%, 48.79%, 47.26%, 48.35%, 48.06%, 49.07%, 47.49%, 45.49%, 47.85%, 48.07%, 45.32%, 47.98%, 46.24%, 48.21%, 46.01%, 46.51%, 47.12%, 44.12%, 45.87%, 44.53%, 46.60%, 43.09%, 43.92%, 44.47%, 44.56%, 45.70%, 46.17%, 45.21%, 45.72%, 48.12%, 47.74%, 43.32%, or 44.51%, or a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or strengthened glass-ceramic having the desired properties of the present application is obtained. It is understood that any of the above ranges can be combined with any other range, as long as a glass-ceramic or strengthened glass-ceramic having the desired properties of the present application is obtained.

[0249] In some embodiments of the present application, the glass-ceramic or strengthened glass-ceramic made therefrom is 2D, 2.5D, 3D, or shaped. In some embodiments of the present application, the glass-ceramic is isometric or anisometric. One skilled in the art can select according to the needs. "Anisometric" means that the strengthened glass-ceramic or the glass-ceramic from which the strengthened glass-ceramic is made comprises at least two portions having different thicknesses.

[0250] In some embodiments of the present application, the glass-ceramic or strengthened glass-ceramic made therefrom is plate-shaped, and the thickness t of the glass-ceramic or strengthened glass-ceramic made therefrom is 0.4 mm to 2.0 mm, preferably, the thickness t is 0.6 mm to 1.5 mm, more preferably, the thickness t is 0.9 mm to 1.5 mm. At present, electronic devices are pursuing light and thin, and when the thickness is too large, on the one hand, the weight will be increased, and on the other hand, the optical effect will be poor, which is not conducive to achieving high transparency. And when the thickness is too small, it is also not conducive to obtaining excellent compression resistance and deformation resistance.

[0251] After the foregoing introduction of the glass-ceramic, the base glass for preparing the glass-ceramic, the composition and microstructure of the strengthened glass-ceramic prepared from the glass-ceramic, the preparation method of the glass-ceramic and the strengthened glass-ceramic prepared from the glass-ceramic will be described in detail.

[0252] In the present application, the preparation process of the glass-ceramic mainly includes the preparation process of the base glass and the heat treatment process of the base glass.

[0253] 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 thereon, for example, the forming method of the base glass can include but is not limited to float method, overflow method, calendering or casting process. Illustratively, the components are mixed according to the formula, and after melting and forming, cooling and annealing treatment are performed, and the base glass can be obtained.

[0254] Illustratively, the raw materials (industrial conventional raw materials) are prepared 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 mixture. The raw material mixture is placed in a platinum crucible, heated to 1450°C to 1800°C, preferably the melting temperature is 1550°C to 1680°C, and preferably the temperature is maintained for 3 to 12 hours, and then poured into a forming mold for cooling and forming, preferably cooled to 800°C to 1000°C, and then placed in an annealing furnace for annealing treatment, preferably the annealing temperature is 500°C to 700°C, and the annealing time is preferably 4 to 48 hours; and then the furnace is cooled to room temperature, and the base glass can be obtained. The person skilled in the art can select the type and amount of the refining agent according to the needs, and it does not require 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 amount of the refining agent can be 0wt% to 1wt% of the total amount of the raw materials.

[0255] In some embodiments of the present application, the heat treatment process of the base glass can include nucleation treatment and / or crystallization treatment, and preferably nucleation treatment and crystallization treatment are used. In some embodiments, the crystallization treatment can include one-step crystallization treatment or multi-step crystallization treatment.

[0256] In some embodiments of the present application, in order to obtain the desired physical and chemical properties of the glass-ceramic, the base glass can be subjected to one-step heat treatment, 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 one-step temperature rising is directly performed, and the nucleation and crystal growth are performed at the temperature reached in the one-step temperature rising process, which can be understood as directly performing crystallization treatment. If two-step heat treatment is performed, it means that two-step temperature rising process is performed, and nucleation treatment (i.e., nucleation treatment) is performed first, and then crystal growth treatment (i.e., crystallization treatment) is performed.

[0257] In the present application, in order to make the glass-ceramic precipitate the desired crystal phase and obtain the desired physical and chemical properties, the nucleation treatment temperature can be 600-850°C, the nucleation treatment time can be 0-72h, preferably 0-10h; the crystallization treatment temperature can be 700-1000°C, the crystallization treatment time can be 0.10-24h, preferably 0.1-6h. When performing heat treatment, the temperature rising rate is preferably controlled to be 5-15°C / min, more preferably the temperature rising rate is 10°C / min. The nucleation treatment temperature refers to the temperature at which crystal nuclei can form. The crystallization treatment temperature refers to the temperature at which the desired crystals can grow controllably.

[0258] After heat treatment, the person skilled in the art can also perform other conventional steps to obtain a glass-ceramic sample that meets the required specifications or requirements, for example, can perform shaping treatment, cutting treatment (such as cutting using a multi-wire cutting machine), CNC processing (computer numerical control), thinning treatment or polishing treatment, etc.

[0259] In some embodiments of the present application, a strengthened glass-ceramic is also provided, which is obtained by subjecting the aforementioned glass-ceramic to chemical strengthening treatment. The composition of the strengthened glass-ceramic at the center or the tensile stress layer is the same as that of the glass-ceramic according to any one of the aforementioned embodiments. The strengthened glass-ceramic comprises a compressive stress layer region extending from the surface of the strengthened glass-ceramic to a compressive depth, and has a tensile stress in the interior of the strengthened glass-ceramic.

[0260] In the present application, the chemical strengthening treatment, i.e. ion exchange method, is to immerse the glass-ceramic in a molten salt bath, so that the alkali metal ions with smaller ionic radius in the glass-ceramic 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-ceramic to obtain a strengthened glass-ceramic with better mechanical properties.

[0261] It should be understood that the stress structure generated by the chemical strengthening process can appropriately improve the mechanical properties of the glass product. In the present application, after the glass-ceramic is subjected to chemical strengthening treatment to obtain a strengthened glass-ceramic, the mechanical properties such as Young's modulus and Vickers hardness of the glass-ceramic do not decrease.

[0262] In some embodiments of the present application, the chemical strengthening treatment can adopt 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. The sodium salt can be at least one selected from the group consisting of sodium nitrate, sodium sulfate and sodium carbonate, and is preferably sodium nitrate. The potassium salt can be at least one selected from the group consisting of potassium nitrate, potassium sulfate and potassium carbonate, and is preferably potassium nitrate. Preferably, in the present application, the chemical strengthening treatment adopts a two-step strengthening method, and the salt bath for the first-step ion exchange is a pure NaNO3 salt bath, and Na + and Li + in the glass ceramic are ion exchanged to obtain a high stress layer depth DOL_0 and a high deep stress. Preferably, the salt bath for the second-step ion exchange is a pure KNO3 salt bath, and K + and Na + in the glass ceramic are ion exchanged to obtain a high surface compressive stress level. In the present application, the temperature of the molten salt bath is preferably 380-600°C, and more preferably 400-500°C. In some embodiments of the present application, a certain amount (e.g. 0-0.5wt%) of lithium salt can be added to the molten salt bath as needed. The lithium salt can be at least one selected from the group consisting of lithium nitrate, lithium sulfate and lithium carbonate, and is preferably lithium nitrate. In some embodiments of the present application, the time for the chemical strengthening treatment is preferably 0.1-48h, and more preferably 0.1-24h.

[0263] In the present application, by performing chemical strengthening on a glass ceramic satisfying a specific composition and a specific crystal phase structure, a strengthened glass ceramic is prepared, so that the prepared strengthened glass ceramic satisfies a suitable stress structure and / or surface composition, which is beneficial to obtain a strengthened glass ceramic product with a higher stress level, and further beneficial to improve the compressive resistance and deformation resistance of the strengthened glass ceramic, so as to ensure that the strengthened glass ceramic achieves excellent compressive effect and excellent deformation resistance effect.

[0264] In some embodiments of the present application, the strengthened glass ceramic has |CT_AV| greater than 20.00MPa, |CT_AV| being the absolute value of the average tensile stress, and preferably, the strengthened glass ceramic has |CT_AV| of 25.00-60.00MPa, which is determined by SLP_2000. This is beneficial to ensure that the strengthened glass ceramic has a more optimal tensile stress layer distribution structure, so that it has a higher surface stress level, and the residual energy of a drop, extrusion, impact or collision which can be offset by a higher surface compressive stress level will be more, and thus the strengthened glass ceramic has excellent damage resistance, excellent compressive resistance and excellent deformation resistance.

[0265] In some embodiments, the strengthened glass-ceramics can have a |CT AV| of 20.00 MPa, 25.00 MPa, 30.00 MPa, 35.00 MPa, 40.00 MPa, 45.00 MPa, 50.00 MPa, 55.00 MPa, 60.00 MPa, 65.00 MPa, 70.00 MPa, 50.57 MPa, 56.75 MPa, 51.89 MPa, 50.87 MPa, 51.03 MPa, 49.80 MPa, 50.55 MPa, 47.42 MPa, 51.74 MPa, 45.60 MPa, 47.10 MPa, 43.21 MPa, 40.60 MPa, 41.88 MPa, 48.60 MPa, 46.55 MPa, 36.82 MPa, 40.00 MPa, 36.50 MPa, 39.52 MPa, 38.30 MPa, 38.25 MPa, 37.03 MPa, 34.05 MPa, 32.76 MPa, 36.06 MPa, 35.26 MPa, 35.61 MPa, 32.05 MPa, 49.12 MPa, 59.15 MPa, 28.19 MPa, or 45.21 MPa, or a value within a range having a lower limit and an upper limit that is any two of the foregoing particular values, as long as a strengthened glass-ceramic having the desired properties of the application is obtained. It is understood that in particular embodiments, any of the foregoing ranges can be combined with any of the other ranges, as long as a strengthened glass-ceramic having the desired properties of the application is obtained.

[0266] In some embodiments of the application, the strengthened glass-ceramics have a |CT CV| greater than 25.00 MPa, where |CT CV| is the absolute value of the maximum tensile stress, preferably, the strengthened glass-ceramics have a |CT CV| of 35.00 MPa to 75.00 MPa, as determined by SLP_2000.

[0267] In some embodiments, the strengthened glass-ceramics can have a |CT_CV| of 25.00 MPa, 30.00 MPa, 35.00 MPa, 40.00 MPa, 45.00 MPa, 50.00 MPa, 55.00 MPa, 60.00 MPa, 65.00 MPa, 70.00 MPa, 75.00 MPa, 80.00 MPa, 85.00 MPa, 90.00 MPa, 95.00 MPa, 100.00 MPa, 66.96 MPa, 74.75 MPa, 72.29 MPa, 70.16 MPa, 59.70 MPa, 62.51 MPa, 60.42 MPa, 69.94 MPa, 57.20 MPa, 61.47 MPa, 55.09 MPa, 53.81 MPa, 49.63 MPa, 62.65 MPa, 60.93 MPa, 56.82 MPa, 47.29 MPa, 52.89 MPa, 50.56 MPa, 52.27 MPa, 51.44 MPa, 48.52 MPa, 43.74 MPa, 45.36 MPa, 40.32 MPa, 47.46 MPa, 45.37 MPa, 45.80 MPa, 42.86 MPa, 65.02 MPa, 70.43 MPa, 36.51 MPa, or 55.74 MPa, or a value within a range having any two of the aforementioned specific values as endpoints, as long as a strengthened glass-ceramic having the desired properties of the present application is obtained. It is understood that in specific embodiments, any of the aforementioned ranges can be combined with any of the other ranges, as long as a strengthened glass-ceramic having the desired properties of the present application is obtained.

[0268] In some embodiments of the present application, the strengthened glass-ceramics have a CS_50 of greater than 100 MPa, where CS_50 is the compressive stress value at a depth of 50 μm from the major surface of the strengthened glass-ceramic, preferably, the strengthened glass-ceramics have a CS_50 of 101 MPa to 300 MPa, as measured by SLP_2000.

[0269] In some embodiments, the strengthened glass-ceramics can have a CS_50 of 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, 188.73 MPa, 238.02 MPa, 175.19 MPa, 178.48 MPa, 272.31 MPa, 185.74 MPa, 184.10 MPa, 174.37 MPa, 186.55 MPa, 203.60 MPa, 172.65 MPa, 183.45 MPa, 157.60 MPa, 220.37 MPa, 182.85 MPa, 165.54 MPa, 175.57 MPa, 135.15 MPa, 136.45 MPa, 114.86 MPa, 140.51 MPa, 134.80 MPa, 137.95 MPa, 123.41 MPa, 122.00 MPa, 141.28 MPa, 143.34 MPa, 128.42 MPa, 125.39 MPa, 110.21 MPa, 186.91 MPa, 195.42 MPa, 103.64 MPa, or 150.99 MPa, or a value within a range having a lower limit and an upper limit of any two of the foregoing particular values, as long as the strengthened glass-ceramics having the desired properties of the present application are obtained. It should be understood that in specific embodiments, any of the foregoing ranges can be combined with any of the other ranges, as long as the strengthened glass-ceramics having the desired properties of the present application are obtained.

[0270] In some embodiments of the present application, the strengthened glass-ceramics have a DOL_0 greater than 144 μm, preferably, the strengthened glass-ceramics have a DOL_0 of 145 μm to 210 μm, as measured by SLP_2000.

[0271] In some embodiments, the strengthened glass-ceramic can have a DOL_0 of 144 μιη, 150 μιη, 155 μιη, 160 μιη, 165 μιη, 170 μιη, 175 μιη, 180 μιη, 185 μιη, 190 μιη, 195 μιη, 200 μιη, 205 μιη, 210 μιη, 215 μιη, 220 μιη, 225 μιη, 230 μιη, 235 μιη, 240 μιη, 189.59 μιη, 195.43 μιη, 195.17 μιη, 192.90 μιη, 157.48 μιη, 191.18 μιη, 188.54 μιη, 183.66 μιη, 194.89 μιη, 149.50 μιη, 178.97 μιη, 171.32 μιη, 145.50 μιη, 165.66 μιη, 185.50 μιη, 169.21 μιη, 173.75 μιη, 176.28 μιη, 173.36 μιη, 186.10 μιη, 186.34 μιη, 188.81 μιη, 162.71 μιη, 162.26 μιη, 161.66 μιη, 183.63 μιη, 175.08 μιη, 174.08 μιη, 159.88 μιη, 193.49 μιη, 201.88 μιη, 151.46 μιη, or 189.03 μιη, or a value within a range having any two of these specifically enumerated values as endpoints, as long as the strengthened glass-ceramic has the desired properties. It will be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramic has the desired properties.

[0272] In some embodiments of the application, the strengthened glass-ceramic has a DOL_0 of 0.16t to 0.25t, where t is the thickness of the strengthened glass-ceramic. In some embodiments, the strengthened glass-ceramic can have a DOL_0 of 0.17t, 0.18t, 0.19t, 0.20t, 0.21t, 0.22t, 0.23t, 0.24t, or 0.25t, or a value within a range having any two of these specifically enumerated values as endpoints, as long as the strengthened glass-ceramic has the desired properties. It will be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramic has the desired properties.

[0273] In some embodiments of the application, the strengthened glass-ceramic has a surface K2O content of 2.00% to 7.50%, preferably 2.50% to 6.00%, in terms of mass percent of oxide, as determined by XRF.

[0274] In some embodiments, the surface K2O content of the strengthened glass ceramic can be 2.50%, 3.00%, 3.50%, 4.00%, 4.50%, 5.00%, 5.50%, 6.00%, 6.50%, 7.00%, 7.50%, 5.21%, 4.53%, 4.11%, 3.86%, 2.82%, 5.46%, 5.24%, 4.69%, 4.55%, 4.39%, 4.20%, 4.28%, 4.07%, 3.84%, 3.35%, 3.74%, 3.78%, 3.12%, 3.86%, 3.74%, 2.98%, 3.06%, 3.94%, 3.89%, 3.54%, 3.66%, 3.52%, 3.45%, 4.43%, 4.12%, 3.91%, 3.16%, 4.93%, 4.98%, 2.87%, or 3.21%, or a value within a range defined by any two of the above specific values as endpoints, as long as a 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 strengthened glass ceramic with desired properties of the present application is obtained.

[0275] In the present application, the single-rod static pressure strength is used to represent the compression resistance of the strengthened glass ceramic. The greater the single-rod static pressure strength that the strengthened glass ceramic can withstand, the better the compression resistance. Meanwhile, the deformation under high load extrusion is used to represent the deformation resistance of the strengthened glass ceramic. The smaller the deformation of the strengthened glass ceramic under high load extrusion, the better the deformation resistance. The strengthened glass ceramic of the present application has excellent compression resistance and excellent deformation resistance, and can achieve good deformation resistance and compression resistance.

[0276] In some embodiments of the present application, a 10 mm diameter round head metal pressure rod is used to extrude the center of the main surface of the strengthened glass ceramic with a thickness of 0.9 mm, and a load is gradually applied vertically downward on the metal pressure rod at a rate of 10 mm / min. The deformation of the strengthened glass ceramic at 760 N load is tested. The strengthened glass ceramic satisfies that the deformation of the stress position of the strengthened glass ceramic in the stress direction is less than 1.850 mm under 760 N load extrusion.

[0277] In some embodiments of the present application, a 10 mm diameter round head metal pressure rod is used to extrude the strengthened glass ceramic with a thickness of 0.9 mm at a rate of 10 mm / min vertically downward. The single-rod static pressure strength that the strengthened glass ceramic can withstand is tested. The strengthened glass ceramic satisfies that the single-rod static pressure strength that the strengthened glass ceramic can withstand is greater than 800 N.

[0278] The glass-ceramics or strengthened glass-ceramics provided in the present application have excellent performance, especially excellent compression resistance and excellent deformation resistance, and can be used in electronic devices, including but not limited to mobile phones, tablets, palm game consoles, portable digital devices (such as digital cameras), vehicle center 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 ships, and can also be used in any desired glass-ceramics or strengthened glass-ceramics glassware. For example, it can be used in the display screen, cover glass, touch screen, glass inner screen or inner frame of an electronic device; for example, it can be used in the windshield of a vehicle, aircraft or ship, 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.

[0279] For example, the glass-ceramics or strengthened glass-ceramics provided in the present application can be used to manufacture glassware. The glassware referred to herein can be regular or irregular, and can be manufactured according to the needs of those skilled in the art.

[0280] For example, the glass-ceramics or strengthened glass-ceramics provided in the present application can be used to manufacture cover glass, which can be a display screen cover, back cover or camera protection cover of an electronic device. For example, the glass-ceramics or strengthened glass-ceramics provided in the present application can be used in electronic devices. Referring to FIGS. 4, 5, 6 and 7, in some embodiments of the present application, an electronic device is provided, which can be a mobile phone, a tablet, a smart wearable device, etc. The electronic device includes a housing 1 assembled on the outside of the electronic device, the housing 1 includes a display screen cover 11 assembled on the front side and a back cover 12 assembled on the back side, and the display screen cover 11 is covered on the display module 4, wherein the display screen cover 11 and / or the back cover 12 are made of the aforementioned glass-ceramics or strengthened glass-ceramics. In the present application, the display screen cover 11 and the back cover 12 can be made of the aforementioned glass-ceramics or strengthened glass-ceramics, or only partially made of the aforementioned glass-ceramics or strengthened glass-ceramics. In the present application, the display screen can be a touch display screen, and the display screen cover 11 can be a protective cover plate arranged on the touch display screen. In the present application, the back cover 12 can cover only the back side of the electronic device (and the side away from the display screen), or can cover the back side and the side frame of the electronic device, and optionally, the back cover 12 can cover all the side frames around the electronic device, or can cover part of the side frames.

[0281] In some embodiments of the present application, as shown in FIG. 5, the electronic device can further include a camera assembly 2 located inside the housing 1, and the housing 1 can include a camera protective cover plate 13 covering the camera assembly 2 for protecting the camera assembly 2, and the camera protective cover plate 13 can be made of the aforementioned glass ceramic or strengthened glass ceramic. In the present application, the camera protective cover plate 13 can be partially made of the aforementioned glass ceramic or strengthened glass ceramic, or can be entirely made of the aforementioned glass ceramic or strengthened glass ceramic. In the present application, the camera protective cover plate 13 can be located on the front side of the electronic device, or can be located on the back side of the electronic device, depending on the location of the camera assembly 2. In some embodiments of the present application, the camera protective 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 protective cover plate 13 can be in an integrated structure with the display screen cover plate 11 or the back cover 12.

[0282] In some embodiments of the present application, as shown in FIG. 6, the electronic device can further include a middle frame 3 located between the display module 4 and the housing 1, and the middle frame 3 can be made of the aforementioned glass ceramic or strengthened glass ceramic.

[0283] In the embodiments of the present application, the display screen cover plate, the back cover, the camera protective cover plate, and the middle frame of the electronic device can be any one, any two, any three, or all of them, made of the aforementioned glass ceramic or strengthened glass ceramic.

[0284] In some embodiments of the present application, the display screen cover plate, the back cover, the camera protective cover plate, or the middle frame of the electronic device can be 2D, 2.5D, 3D, or of a special shape. In some embodiments of the present application, the display screen cover plate, the back cover, the camera protective cover plate, or the middle frame of the electronic device can be of equal thickness or of unequal thickness.

[0285] The technical solutions of the present application are further described in detail below in conjunction 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.

[0286] Embodiment 1

[0287] A strengthened glass ceramic is prepared by the following process:

[0288] (1) Preparation of base material glass:

[0289] The raw materials (industrial conventional raw materials) are prepared according to the proportions of the components in Table 1, the total mass of the prepared raw materials is 1000g, 5g of clarifying agent sodium chloride (NaCl) is added to the prepared raw materials, and then the V-shaped mixer is used for mixing for 30 minutes to obtain a raw material mixture with uniform mixing.

[0290] The raw material mixture is transferred into a platinum-gold crucible, then melted in the platinum-gold crucible at 1650°C for 5 hours, and then poured into a forming mold to form and cool, cooled to 900°C, and then placed in a 600°C annealing furnace for annealing for 24 hours, and then cooled to room temperature in the furnace, to obtain the base glass brick.

[0291] (2) Preparation of the glass-ceramic: the base glass brick is placed in an annealing furnace, and heated from room temperature to 710°C at a rate of 10°C / min for nucleation treatment, and then heated to 750°C at a rate of 10°C / min for crystallization treatment after maintaining at 710°C for 240 min, and then cooled to room temperature at a rate of 1°C / min, to obtain the glass-ceramic sample brick. The composition of the prepared glass-ceramic is the same as that of the base glass, and is shown in Table 1 in terms of mass percentage of oxides.

[0292] After the obtained glass-ceramic sample brick is subjected to cold processing of cutting, CNC processing (the CNC instrument used in the present application is of RCG500S type), and polishing in sequence, a glass-ceramic sample meeting the required specifications and requirements can be prepared. In Examples 1-36 and Comparative Examples 1-10 of the present application, the glass-ceramic sample brick is subjected to the aforementioned cold processing to prepare a glass-ceramic sample with a thickness of 0.90 mm, specifically, a circular glass-ceramic polished piece sample with a diameter of 46 mm and a thickness of 0.9 mm is prepared.

[0293] Test conditions of the glass-ceramic sample / piece obtained in Example 1:

[0294] The crystal phase composition, average grain size, total content of crystal phase, transmittance (transmittance at 550 nm wavelength), density of the glass-ceramic sample / piece are tested respectively, and the mass content ratio of the zinc-magnesium-aluminum spinel solid solution W [(Zn，Mg)Al2O4] and the mass content of zirconia W [ZrO2] and the mass percentage of zirconia in all crystal phases are calculated, and the results are shown in Table 2 respectively.

[0295] (3) Preparation of the strengthened glass-ceramic: the obtained glass-ceramic sample / piece is placed in a strengthening furnace cavity for preheating for 5 min, then quickly placed in a 450°C molten salt bath for first-step strengthening treatment, the composition of the molten salt is 100wt% NaNO3, the chemical strengthening treatment time is 7h, then the glass-ceramic sample / piece is placed in a 430°C molten salt bath for second-step strengthening treatment, the composition of the molten salt is 100wt% KNO3, the chemical strengthening treatment time is 3h, then the glass-ceramic sample is taken out and slowly cooled to room temperature on the furnace body of the strengthening furnace, and the salt on the surface of the glass-ceramic is washed off with clean water, and the glass-ceramic sample / piece is dried to obtain the strengthened glass-ceramic.

[0296] The test conditions of the strengthened glass ceramic samples / slices obtained in Example 1 are as follows:

[0297] I. The CS_50, DOL_0, |CT_CV| and |CT_AV| of the strengthened glass ceramic were measured by SLP-2000 stress meter (the light source wavelength used is 518 nm, SOC = 25.5 (nm / cm) / MPa, the refractive index is set to 1.60, and the exposure time is 300 μsec), and the results are shown in Table 3.

[0298] II. The surface K2O mass percentage of the strengthened glass ceramic was measured by XRF, and the results are shown in Table 3.

[0299] III. The single rod static pressure strength and the deformation amount at a load of 760 N of the strengthened glass ceramic were tested, and the results are shown in Table 3.

[0300] Examples 2-36

[0301] Each of the examples was performed with reference to Example 1, except that the raw material composition, different process parameters and the corresponding test results of each example are shown in Tables 1-3.

[0302] The transmittance curve comparison diagram of the glass ceramic and the strengthened glass ceramic of Example 1 is shown in FIG. 8. As can be seen from the diagram, the glass ceramic and the strengthened glass ceramic prepared therefrom are transparent in the visible light range, have high transmittance, and the transmittance remains basically unchanged before and after chemical strengthening.

[0303] The XRD pattern comparison diagram of the glass ceramic and the strengthened glass ceramic of Example 1 is shown in FIG. 9. As can be seen from the diagram, ① the main crystal phase of the glass ceramic and the strengthened glass ceramic is (Zn, Mg) Al2O4 solid solution, and the secondary crystal phase is ZrO2; ② the XRD patterns of the glass ceramic and the strengthened glass ceramic are basically coincident, indicating that the crystal phase structure basically does not change before and after chemical strengthening.

[0304] Comparative Examples 1-10

[0305] Each of the comparative examples was performed with reference to Example 1, except that the raw material composition, different process parameters and the corresponding test results of each comparative example are shown in Tables 1-3.

[0306] The load deformation curve diagram of the strengthened glass ceramic of Example 22, Example 25 and Comparative Example 1 is shown in FIG. 10. As can be seen from the diagram, compared with Comparative Example 1, the deformation amount of the strengthened glass ceramic provided by Examples 22 and 25 of the application is obviously smaller under the same load, and the strengthened glass ceramic provided by Examples 22 and 25 of the application has better anti-deformation ability.

[0307] The photographs of the strengthened glass-ceramics of Example 1, Comparative Example 7 and Comparative Example 9 in the same background are compared as shown in FIG. 11. It can be seen from the figure that, compared with Example 1, the strengthened glass-ceramic samples of Comparative Example 7 and Comparative Example 9 appeared fogging or devitrification in the same background due to the decrease in transmittance, and Comparative Example 7 also showed an undesirable color.

[0308] Table 1

[0309] Note: 1. In Table 1, the oxide content of "0" means that the component is not actively or intentionally added to the glass composition during the initial batching process, but the component can exist as an impurity.

[0310] 2. In Table 1, the relationships A, B, C, D, M, N, and P are all calculated by substituting the content of the oxide in mole percent into each relationship, for example, the mole percent content of SiO2 is 45.22%, then 45.22% or 0.4522 is substituted into the corresponding relationship for calculation, and the mole unit does not participate in the calculation of the relationship.

[0311] Table 2

[0312] Table 3

[0313] From the above embodiments and comparative examples of Tables 1-3, compared with the comparative examples, by using the embodiment scheme of the present application, by adding La2O3 and / or Y2O3 in the glass composition formula capable of preparing glass-ceramics with spinel as the main crystal phase, while the content of each component meets the specific requirements, and by combining the crystal phase composition of the glass-ceramics to meet the specific content relationship, the strength performance of the glass-ceramics is better improved while ensuring excellent optical performance of the glass-ceramics, and then it is ensured that the prepared glass-ceramics can be chemically strengthened, and the strengthened glass-ceramics with excellent compression resistance and excellent deformation resistance are prepared.

[0314] In the schemes of Comparative Example 1-Comparative Example 10, the prepared glass-ceramics either cannot meet the requirements of the content relationship of the oxides, or cannot meet the requirements of the content ratio of the main crystal phase of zinc aluminate-magnesium aluminate spinel solid solution and the secondary crystal phase of zirconia. Finally, the glass-ceramics of Comparative Example 1-Comparative Example 10 either cannot achieve high transparency, showing a decrease in transmittance, with a transmittance of less than 85% at a wavelength of 550 nm, or, although high transparency can be achieved, the compressive strength and / or deformation resistance of the strengthened glass-ceramics prepared after being treated by the same strengthening process as the examples is significantly inferior to the examples that meet the requirements of the schemes of the present application.

[0315] The above only describes specific examples of the present application and is not intended to limit the present application. Various modifications and changes can be made to the present application by those skilled in the art. 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

[0316] In the present application, by making the content relationship of part of the oxides in the glass-ceramic composition meet specific requirements, and at the same time making the glass-ceramic meet the requirements that the zinc aluminate-magnesium aluminate spinel solid solution is the main crystal phase, and the content relationship of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase and the zirconia crystal phase meets specific requirements, the glass-ceramic obtains a specific crystal phase structure and a specific glass phase structure, thereby ensuring that the glass-ceramic achieves excellent optical performance while better improving the strength performance of the glass-ceramic, and further ensuring that the prepared glass-ceramic can be chemically strengthened to obtain a strengthened glass-ceramic with excellent compressive strength and excellent deformation resistance.

Claims

1. A glass-ceramic, characterized in that, The glass ceramic comprises a main crystal phase of a zinc aluminate-magnesium aluminate spinel solid solution and a secondary crystal phase of zirconia, and in the glass ceramic, the mass content W of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase [(Zn，Mg)Al2O4] and the mass content W of the zirconia crystal phase [ZrO2] satisfy the relationship: Z = W [(Zn，Mg)Al2O4] / W [ZrO2] , 1.00≤Z≤8.00, preferably 1.00≤Z≤6.00, and more preferably 1.20≤Z≤4.50; The molar percentage of SiO2 [SiO2], the molar percentage of La2O3 [La2O3], the molar percentage of Y2O3 [Y2O3], the molar percentage of BaO [BaO], the molar percentage of Li2O [Li2O], the molar percentage of Na2O [Na2O], the molar percentage of Al2O3 [Al2O3], and the molar percentage of ZrO2 [ZrO2] in the composition of the glass ceramic satisfy the following relational expression: N = 4.5 x [La2O3] x 100 - ln([La2O3] x 100 + 0.001) + 7.85 x [Y2O3] x 100 - ln([Y2O3] x 100 + 0.008) + exp([BaO] x 100 - 2.5) + ln([Li2O] / [Na2O]) + ln([Al2O3] / [ZrO2]), N < 14.00, preferably, 5 ≤ N < 14.00, more preferably, 8 ≤ N < 14.00, more preferably, 8 ≤ N < 11.50; ([La2O3] + [Y2O3]) x 100 / [SiO2] > 0. The composition of the glass ceramic, in terms of molar percentage of oxides, contains: SiO2 35.00% to 50.00%, Al2O3 20.00% to 35.00%, ZrO2 3.00% to 5.00%, MgO 4.00% to 7.00%, ZnO 9.00% to 12.00%, Na2O 2.00% to 10.00%, Li2O 2.00% to 10.00%, BaO 0.00% to 5.00%, La2O3 0.00% to 1.80%, and Y2O3 0.00% to 0.50%.

2. The glass-ceramic according to claim 1, characterized in that, The composition of the glass ceramic, in terms of molar percentage of oxides, contains:

3. The glass-ceramic according to any one of claims 1 to 2, characterized in that, The molar percentage of SiO2 is 40.00% to 48.00%, preferably, the molar percentage of SiO2 is 42.00% to 46.00%; and / or, The molar percentage of Al2O3 is 24.00% to 30.00%, preferably, the molar percentage of Al2O3 is 25.00% to 28.00%; and / or, The molar percentage of ZrO2 is 3.00% to 4.00%, preferably, the molar percentage of ZrO2 is 3.10% to 3.70%; and / or, The molar percentage of MgO is 5.00% to 6.00%, preferably, the molar percentage of MgO is 5.20% to 5.90%; and / or, The molar percentage of ZnO is 9.00% to 11.00%, preferably, the molar percentage of ZnO is 9.00% to 10.50%; and / or, The molar percentage of Na2O is 3.00% to 8.00%, preferably, the molar percentage of Na2O is 3.00% to 6.00%; and / or, The molar percentage of Li2O is 3.00% to 9.00%, preferably, the molar percentage of Li2O is 3.50% to 8.00%; and / or, ​ the molar percentage of BaO is 0% to 4.00%, preferably the molar percentage of BaO is 0% to 3.50%; and / or, the molar percentage of La2O3 is 0% to 1.70%, preferably the molar percentage of La2O3 is 0% to 1.60%.

4. The glass-ceramic according to any one of claims 1 to 3, characterized in that, The molar percentage of La203[La203], the molar percentage of Y203[Y203], and the molar percentage of BaO [BaO] in the composition of the glass-ceramic satisfy the following relationships: A = 3 x [La203] x 100 + 5 x [Y203] x 100, 0.10 ≤ A ≤ 5.00, preferably 0.50 ≤ A ≤ 5.00, more preferably 0.50 ≤ A ≤ 3.50; and / or, B = [BaO] x 100 x (([BaO] x 100 - 2.7) 2 - 0.09), 0 ≤ B ≤ 5.50, preferably 0 ≤ B ≤ 3.00, more preferably 0 ≤ B ≤ 2.8; and / or, C = A + B, C < 8.00, preferably 1.50 ≤ C ≤ 7.50, more preferably 1.50 ≤ C ≤ 6.

10.

5. The glass-ceramic according to any one of claims 1 to 4, characterized in that, In the composition of the glass ceramic, the molar percentage of La2O3 [La2O3], the molar percentage of Y2O3 [Y2O3], the molar percentage of BaO [BaO], and the molar percentage of Al2O3 [Al2O3] satisfy the following relationship: D=(exp([La2O3]x100-2.1)+exp([Y2O3]x100-0.45)) / (0.5+exp([BaO]x100-4.0))+exp([Al2O3]x100-30.0), and the value of D is 0.50≤D≤2.50, preferably 0.70≤D≤2.40, more preferably 0.80≤D≤2.

00.

6. The glass-ceramic according to any one of claims 1 to 5, characterized in that, In the composition of the glass ceramic, the molar percentage of Li2O [Li2O], the molar percentage of Na2O [Na2O], the molar percentage of ZrO2 [ZrO2], the molar percentage of BaO [BaO], the molar percentage of Al2O3 [Al2O3], the molar percentage of MgO [MgO], the molar percentage of ZnO [ZnO], and the molar percentage of SiO2 [SiO2] satisfy the following relationship: M=([Li2O]+2.00x[Na2O]+2.00x[ZrO2]+0.50x[BaO]+6.32x([Al2O3]-([MgO]+[ZnO]))) / ([SiO2]+[MgO]+[ZnO]), M≥1.00, preferably 1.20≤M≤1.7, more preferably 1.35≤M≤1.60; and / or, P=M / exp((N-14)x0.5), P≥1.50, preferably 1.50≤P≤31.0, more preferably 6.0≤P≤31.0, more preferably 6.5≤P≤30.

5.

7. The glass-ceramic according to any one of claims 1 to 6, characterized in that, In the glass-ceramic, the mass content W of the gahnite-magnesio-aluminate spinel solid solution crystalline phase is [(Zn，Mg)Al2O4] 20.00% to 50.00%, preferably 24.00% to 45.00%, more preferably 30.00% to 45.00%; and / or, In the glass-ceramic, the mass content W of the zirconia crystalline phase is [ZrO2] 4.00% to 25.00%, preferably 5.00% to 21.00%, more preferably 5.00% to 16.00%; and / or, In all crystal phases of the glass ceramic, the mass percentage of the zirconia crystal phase is 10.00% to 45.00%, preferably 10.00% to 35.00%.

8. The glass-ceramic according to any one of claims 1 to 7, characterized in that, The glass ceramic is transparent in the visible light wavelength range, preferably the transmittance of the glass ceramic at a wavelength of 550 nm is ≥85.00% at a thickness of 0.90 mm.

9. The glass-ceramic according to any one of claims 1 to 8, characterized in that, In the glass ceramic, the average grain size is not more than 20 nm, preferably 3.0 nm to 10.0 nm, more preferably 5.0 nm to 10.0 nm; and / or, In the glass ceramic, the total content of crystal phases is 30% to 55% by mass, preferably 35% to 55%, more preferably 40% to 55%.

10. The glass-ceramic according to any one of claims 1 to 9, characterized in that, The thickness t of the glass ceramic is 0.4 mm to 2.0 mm, preferably the thickness t is 0.6 mm to 1.5 mm, more preferably the thickness t is 0.9 mm to 1.5 mm; and / or, the glass-ceramic is 2D, 2.5D, 3D, or shaped; and / or, the glass-ceramic is isopachous or anisopachous.

11. The glass-ceramic according to any one of claims 1 to 10, characterized in that, the glass-ceramic satisfies: the ratio Z of the mass content of the zinc aluminate-magnesium aluminate spinel solid solution crystalline phase and the mass content of the zirconia crystalline phase is 3.03, 2.19, 2.21, 2.29, 2.20, 2.27, 1.68, 3.08, 2.64, 1.87, 1.34, 2.09, 1.28, 1.38, 1.97, 1.62, 2.32, 1.80, 4.41, 2.92, 1.46, 2.44, 2.33, 1.30, 1.31, 1.23, 1.82, 1.44, 1.29, 2.40, 2.14, or 2.66; and / or, the value of the relationship N is: 10.16, 10.59, 11.44, 12.83, 13.91, 12.87, 13.26, 8.47, 8.90, 9.75, 11.10, 10.36, 11.15, 11.54, 10.28, 12.92, 13.74, 9.79, 11.07, 13.54, 8.09, 8.53, 9.38, 10.73, 9.55, 9.99, 10.78, 12.50, 13.39, 13.96, 11.21, 8.29, 8.58, 10.39, or 8.

02.

12. The glass-ceramic according to any one of claims 1 to 11, characterized in that, the composition of the glass-ceramic, in terms of molar percent of oxides, comprises: the molar percent of SiO2is 45.22%, 45.09%, 44.95%, 44.77%, 44.64%, 45.18%, 45.13%, 44.99%, 44.86%, 44.69%, 44.73%, 44.29%, 43.95%, 44.33%, 44.03%, 43.91%, 45.66%, 45.39%, 45.07%, 45.57%, 45.43%, 45.30%, 45.16%, 45.52%, 44.72%, 44.76%, 42.34%, or 44.04%; and / or, the molar percent of Al2O3is 25.75%, 25.67%, 25.60%, 25.49%, 25.42%, 25.72%, 25.70%, 25.62%, 25.54%, 25.44%, 25.47%, 25.22%, 25.02%, 25.24%, 25.07%, 25.00%, 26.99%, 26.83%, 26.64%, 26.93%, 26.85%, 26.77%, 26.67%, 26.69%, 26.91%, 26.42%, 26.00%, 25.48%, 27.23%, or 27.44%; and / or, the mole percent of Zr02 is 3.38%, 3.37%, 3.36%, 3.35%, 3.34%, 3.32%, 3.29%, 3.28%, 3.41%, 3.39%, 3.40%, 3.42%, 3.49%, or 3.55%; and / or, the mole percent of MgO is 5.46%, 5.44%, 5.43%, 5.41%, 5.39%, 5.45%, 5.42%, 5.40%, 5.35%, 5.31%, 5.32%, 5.30%, 5.51%, 5.48%, 5.50%, 5.49%, 5.78%, or 5.87%; and / or, the mole percent of ZnO is 9.69%, 9.66%, 9.63%, 9.59%, 9.57%, 9.68%, 9.67%, 9.64%, 9.61%, 9.58%, 9.49%, 9.42%, 9.50%, 9.44%, 9.41%, 9.78%, 9.72%, 9.76%, 9.73%, 9.70%, 9.75%, 9.92%, or 10.08%; and / or, the mole percent of Na20 is 3.38%, 3.37%, 3.36%, 3.35%, 3.34%, 3.31%, 3.29%, 3.32%, 3.28%, 3.42%, 3.40%, 3.41%, 3.39%, 3.54%, or 3.60%; and / or, the mole percent of Li20 is 5.76%, 5.74%, 5.73%, 5.70%, 5.68%, 5.75%, 5.71%, 5.69%, 5.64%, 5.60%, 5.65%, 5.61%, 5.59%, 3.86%, 3.84%, 3.81%, 3.85%, 3.83%, 3.82%, 3.79%, 5.81%, 7.67%, or 3.90%; and / or, the mole percent of BaO is 1.16%, 1.15%, 1.14%, 2.11%, 3.45%, 2.31%, 3.46%, 1.17%, 2.13%, 0%, or 1.12%; and / or, the mole percent of La203 is 0.20%, 0.50%, 0.79%, 1.19%, 1.48%, 0%, 1.18%, 0.78%, 0.48%, or 0.49%; and / or, the mole percent of Y203 is 0%, 0.20%, 0.30%, 0.50%, 0.49%, 0.19%, or 0.40%.

13. The glass-ceramic according to any one of claims 4 to 12, characterized in that, the value of relationship A is 0.60, 1.50, 2.37, 3.57, 4.44, 1.00, 1.60, 2.50, 3.37, 4.54, 4.00, 4.82, 4.79, 2.39, 3.34, 1.47, 2.34, 3.10, or 2.00; and / or, the value of relationship formula B is 2.65, 2.66, 2.67, 0.54, 1.63, 0.14, 1.69, 2.63, 0.50, 0, or 2.70; and / or, the value of relationship formula C is 3.25, 4.15, 5.03, 6.23, 7.11, 3.65, 4.25, 5.16, 6.03, 7.21, 6.66, 7.49, 5.33, 4.02, 3.48, 3.16, 3.97, 3.23, 5.02, 7.10, 5.15, 6.02, 7.20, 5.75, 6.65, 7.47, 3.63, 4.65, 5.13, 5.32, 1.60, 3.29, or 4.

30.

14. The glass-ceramic according to any one of claims 5 to 13, characterized in that, the value of relationship formula D is 1.42, 1.52, 1.64, 1.88, 2.12, 1.63, 1.77, 1.68, 1.89, 2.26, 2.36, 2.02, 0.91, 1.54, 0.78, 0.85, 1.46, 1.67, 2.14, 1.71, 1.80, 1.92, 2.15, 2.19, 2.28, 2.38, 1.66, 1.97, 2.03, 1.81, 0.92, or 1.

75.

15. The glass-ceramic according to any one of claims 6 to 14, characterized in that, the value of relationship formula M is 1.44, 1.45, 1.46, 1.51, 1.52, 1.43, or 1.59; and / or, the value of relationship formula P is 9.82, 7.90, 5.17, 2.58, 1.50, 2.53, 2.08, 22.82, 18.44, 12.06, 6.11, 8.88, 5.99, 4.95, 6.06, 9.29, 2.50, 1.66, 12.41, 6.54, 1.90, 28.97, 23.30, 15.25, 7.74, 13.95, 11.20, 7.55, 3.19, 2.05, 1.54, 6.12, 24.91, 21.93, 9.68, or 30.

27.

16. The glass-ceramic according to any one of claims 7 to 15, characterized in that, In the glass-ceramic, the mass content W of the gahnite-magnesio-aluminate solid solution crystalline phase is [(Zn，Mg)Al2O4] 37.19%, 33.30%, 32.88%, 33.97%, 32.51%, 33.58%, 30.12%, 37.05%, 34.43%, 29.66%, 27.42%, 32.50%, 25.40%, 26.24%, 31.81%, 28.62%, 33.70%, 29.56%, 37.91%, 35.10%, 26.16%, 32.52%, 31.17%, 31.50%, 24.39%, 24.91%, 24.96%, 24.56%, 29.52%, 27.29%, 25.50%, 26.47%, 34.67%, 32.53%, 33.65% or 31.16%; and / or, In the glass-ceramic, the mass content W of the zirconia crystalline phase is [ZrO2] 12.28%, 15.19%, 14.85%, 14.82%, 14.75%, 14.77%, 17.94%, 12.02%, 13.06%, 15.83%, 20.43%, 15.57%, 19.81%, 19.08%, 16.17%, 17.62%, 14.51%, 16.45%, 8.60%, 17.96%, 13.35%, 13.36%, 15.10%, 18.70%, 19.01%, 19.51%, 20.00%, 16.18%, 18.88%, 19.71%, 19.25%, 14.45%, 15.21%, or 12.67%; and / or, the mass percentage of the zirconia crystal phase in all crystal phases of the glass-ceramic is 24.82%, 31.33%, 31.11%, 30.38%, 31.21%, 30.54%, 37.33%, 24.50%, 27.50%, 34.80%, 42.70%, 32.40%, 43.82%, 42.10%, 33.70%, 38.10%, 30.10%, 35.75%, 18.50%, 25.50%, 40.70%, 29.10%, 30.00%, 43.40%, 43.29%, 43.87%, 44.88%, 35.40%, 40.90%, 43.60%, 30.03%, 31.86%, 29.25%, or 29.99%.

17. The glass-ceramic according to any one of claims 1 to 16, characterized in that, The average grain size in the glass-ceramic is 5.6 nm, 6.0 nm, 6.4 nm, 8.4 nm, 9.6 nm, 5.4 nm, 7.1 nm, 5.2 nm, 8.8 nm, 7.2 nm, 9.1 nm, 9.5 nm, 8.1 nm, 6.9 nm, 8.2 nm, 6.8 nm, 6.2 nm, 8.9 nm, 7.5 nm, 5.9 nm, 9.0 nm, 9.3 nm, 7.4 nm, 9.9 nm, or 7.0 nm; and / or, The total content of the crystalline phase in the glass-ceramic is 49.47%, 48.49%, 47.73%, 48.79%, 47.26%, 48.35%, 48.06%, 49.07%, 47.49%, 45.49%, 47.85%, 48.07%, 45.32%, 47.98%, 46.24%, 48.21%, 46.01%, 46.51%, 47.12%, 44.12%, 45.87%, 44.53%, 46.60%, 43.09%, 43.92%, 44.47%, 44.56%, 45.70%, 46.17%, 45.21%, 45.72%, 48.12%, 47.74%, 43.32%, or 44.51% in terms of mass percentage.

18. A strengthened glass-ceramic, characterized in that, The composition at the center of the strengthened glass-ceramic or the tensile stress layer is the same as that of the glass-ceramic according to any one of claims 1 to 17, the strengthened glass-ceramic comprises a compressive stress layer region extending from the surface of the strengthened glass-ceramic to a depth of compression, and has a tensile stress in the interior of the strengthened glass-ceramic.

19. The strengthened glass ceramic of claim 18, wherein, In the strengthened glass ceramic, a main crystal phase of a zinc aluminate-magnesium aluminate spinel solid solution and a secondary crystal phase of zirconia are included, and in the strengthened glass ceramic, the mass content W of the zinc aluminate-magnesium aluminate spinel solid solution crystal phase [(Zn，Mg)Al2O4] and the mass content W of the zirconia crystal phase satisfy the relationship: Z = W [ZrO2] [(Zn，Mg)Al2O4] / W [ZrO2] , 1.00≤Z≤8.00, preferably 1.00≤Z≤6.00, and more preferably 1.20≤Z≤4.50.​ In the composition at the center of the strengthened glass-ceramic or the tensile stress layer, the molar percentage of SiO2 [SiO2], the molar percentage of La2O3 [La2O3], the molar percentage of Y2O3 [Y2O3], the molar percentage of BaO [BaO], the molar percentage of Li2O [Li2O], the molar percentage of Na2O [Na2O], the molar percentage of Al2O3 [Al2O3], and the molar percentage of ZrO2 [ZrO2] satisfy the following relational expression: N = 4.5 x [La2O3] x 100 - ln([La2O3] x 100 + 0.001) + 7.85 x [Y2O3] x 100 - ln([Y2O3] x 100 + 0.008) + exp([BaO] x 100 - 2.5) + ln([Li2O] / [Na2O]) + ln([Al2O3] / [ZrO2]), N < 14.00, preferably, 5 ≤ N < 14.00, more preferably, 8 ≤ N < 14.00, more preferably, 8 ≤ N < 11.50; ([La2O3] + [Y2O3]) x 100 / [SiO2] > 0. ​ 20. The strengthened glass ceramic of any one of claims 18-19, wherein, The composition at the center or the tensile stress layer of the strengthened glass ceramic comprises, in terms of mole percent of oxides: SiO2 35.00% to 50.00%, Al2O3 20.00% to 35.00%, ZrO2 3.00% to 5.00%, MgO 4.00% to 7.00%, ZnO 9.00% to 12.00%, Na2O 2.00% to 10.00%, Li2O 2.00% to 10.00%, BaO 0.00% to 5.00%, La2O3 0.00% to 1.80%, and Y2O3 0.00% to 0.50%.

21. The strengthened glass ceramic of any one of claims 18-20, wherein, The molar percentage of La203[La203], the molar percentage of Y203[Y203], and the molar percentage of BaO [BaO] in the composition at the center of the strengthened glass ceramic or the composition of the tensile stress layer satisfy the following relationships: A = 3 x [La203] x 100 + 5 x [Y203] x 100, 0.10 < A < 5.00, preferably, 0.50 < A < 5.00, more preferably, 0.50 < A < 3.50; and / or, B = [BaO] x 100 x (([BaO] x 100 - 2.7) 2 - 0.09), 0 < B < 5.50, preferably, 0 < B < 3.00, more preferably, 0 < B < 2.8; and / or, C = A + B, C < 8.00, preferably, 1.50 < C < 7.50, more preferably, 1.50 < C < 6.

10.

22. The strengthened glass ceramic of any one of claims 18-21, wherein, The mole percent of La2O3 [La2O3], the mole percent of Y2O3 [Y2O3], the mole percent of BaO [BaO], and the mole percent of Al2O3 [Al2O3] in the composition at the center or the tensile stress layer of the strengthened glass ceramic satisfy the following relationship: D = (exp([La2O3]x100-2.1) + exp([Y2O3]x100-0.45)) / (0.5 + exp([BaO]x100-4.0)) + exp([Al2O3]x100-30.0), and the value of D is 0.50≤D≤2.50, preferably 0.70≤D≤2.40, and more preferably 0.80≤D≤2.

00.

23. The strengthened glass ceramic of any one of claims 18-22, wherein, The mole percent of Li2O [Li2O], the mole percent of Na2O [Na2O], the mole percent of ZrO2 [ZrO2], the mole percent of BaO [BaO], the mole percent of Al2O3 [Al2O3], the mole percent of MgO [MgO], the mole percent of ZnO [ZnO], and the mole percent of SiO2 [SiO2] in the composition at the center or the tensile stress layer of the strengthened glass ceramic satisfy the following relationship: M = ([Li2O] + 2.00x[Na2O] + 2.00x[ZrO2] + 0.50x[BaO] + 6.32x([Al2O3] - ([MgO] + [ZnO]))) / ([SiO2] + [MgO] + [ZnO]), M≥1.00, preferably 1.20≤M≤1.7, and more preferably 1.35≤M≤1.60; and / or, P = M / exp((N-14)x0.5), P≥1.50, preferably 1.50≤P≤31.0, more preferably 6.0≤P≤31.0, and more preferably 6.5≤P≤30.

5.

24. The strengthened glass ceramic of any one of claims 18 to 23, wherein, The strengthened glass ceramic has |CT_AV| greater than 20.00 MPa, |CT_AV| being the absolute value of the average tensile stress, and preferably the strengthened glass ceramic has |CT_AV| of 25.00 MPa to 60.00 MPa; and / or, The strengthened glass ceramic has a |CT_CV| greater than 25.00 MPa, |CT_CV| being the absolute value of the maximum tensile stress, preferably, the strengthened glass ceramic has a |CT_CV| of 35.00 MPa to 75.00 MPa; and / or, The strengthened glass ceramic has a CS_50 greater than 100 MPa, CS_50 being the compressive stress value at a depth of 50 μm from the main surface of the strengthened glass ceramic, preferably, the strengthened glass ceramic has a CS_50 of 101 MPa to 300 MPa; and / or, The strengthened glass ceramic has a DOL_0 greater than 144 μm, DOL_0 being the depth of the compressive stress layer, preferably, the strengthened glass ceramic has a DOL_0 of 145 μm to 210 μm; and / or, The DOL_0 of the strengthened glass ceramic is 0.16t to 0.25t, t being the thickness of the strengthened glass ceramic; and / or, The surface K2O mass percentage of the strengthened glass ceramic is 2.00% to 7.50% in terms of mass percentage of oxide, preferably 2.50% to 6.00%.

25. The strengthened glass ceramic of any one of claims 18 to 24, wherein, The |CT_AV| of the strengthened glass ceramic is 50.57 MPa, 56.75 MPa, 51.89 MPa, 50.87 MPa, 51.03 MPa, 49.80 MPa, 50.55 MPa, 47.42 MPa, 51.74 MPa, 45.60 MPa, 47.10 MPa, 43.21 MPa, 40.60 MPa, 41.88 MPa, 48.60 MPa, 46.55 MPa, 36.82 MPa, 40.00 MPa, 36.50 MPa, 39.52 MPa, 38.30 MPa, 38.25 MPa, 37.03 MPa, 34.05 MPa, 32.76 MPa, 36.06 MPa, 35.26 MPa, 35.61 MPa, 32.05 MPa, 49.12 MPa, 59.15 MPa, 28.19 MPa, or 45.21 MPa; and / or, The |CT_CV| of the strengthened glass ceramic is 66.96 MPa, 74.75 MPa, 72.29 MPa, 70.16 MPa, 59.70 MPa, 62.51 MPa, 60.42 MPa, 69.94 MPa, 57.20 MPa, 61.47 MPa, 55.09 MPa, 53.81 MPa, 49.63 MPa, 62.65 MPa, 60.93 MPa, 56.82 MPa, 47.29 MPa, 52.89 MPa, 50.56 MPa, 52.27 MPa, 51.44 MPa, 48.52 MPa, 43.74 MPa, 45.36 MPa, 40.32 MPa, 47.46 MPa, 45.37 MPa, 45.80 MPa, 42.86 MPa, 65.02 MPa, 70.43 MPa, 36.51 MPa, or 55.74 MPa; and / or, The strengthened glass-ceramics have a CS_50 of 188.73 MPa, 238.02 MPa, 175.19 MPa, 178.48 MPa, 272.31 MPa, 185.74 MPa, 184.10 MPa, 174.37 MPa, 186.55 MPa, 203.60 MPa, 172.65 MPa, 183.45 MPa, 157.60 MPa, 220.37 MPa, 182.85 MPa, 165.54 MPa, 175.57 MPa, 135.15 MPa, 136.45 MPa, 114.86 MPa, 140.51 MPa, 134.80 MPa, 137.95 MPa, 123.41 MPa, 122.00 MPa, 141.28 MPa, 143.34 MPa, 128.42 MPa, 125.39 MPa, 110.21 MPa, 186.91 MPa, 195.42 MPa, 103.64 MPa, or 150.99 MPa; and / or, The strengthened glass-ceramics have a DOL_0 of 189.59 µm, 195.43 µm, 195.17 µm, 192.90 µm, 157.48 µm, 191.18 µm, 188.54 µm, 183.66 µm, 194.89 µm, 149.50 µm, 178.97 µm, 171.32 µm, 145.50 µm, 165.66 µm, 185.50 µm, 169.21 µm, 173.75 µm, 176.28 µm, 173.36 µm, 186.10 µm, 186.34 µm, 188.81 µm, 162.71 µm, 162.26 µm, 161.66 µm, 183.63 µm, 175.08 µm, 174.08 µm, 159.88 µm, 193.49 µm, 201.88 µm, 151.46 µm, or 189.03 µm; and / or, The strengthened glass-ceramics have a surface K2O mass percent of 5.21%, 4.53%, 4.11%, 3.86%, 2.82%, 5.46%, 5.24%, 4.69%, 4.55%, 4.39%, 4.20%, 4.28%, 4.07%, 3.84%, 3.35%, 3.74%, 2.98%, 3.06%, 3.94%, 3.89%, 3.54%, 3.66%, 3.52%, 3.45%, 4.43%, 4.12%, 3.91%, 3.16%, 4.93%, 4.98%, 2.87%, or 3.21%.

26. The strengthened glass ceramic of any one of claims 18 to 25, wherein, The central part of the main surface of the strengthened glass ceramic with a thickness of 0.9 mm is extruded by a 10 mm diameter round head metal pressing rod, and a vertical downward load is gradually applied on the metal pressing rod at a rate of 10 mm / min, the deformation of the strengthened glass ceramic under a load of 760 N is tested, the strengthened glass ceramic satisfies: the deformation of the stress position of the strengthened glass ceramic to the stress direction is less than 1.850 mm under the extrusion of the load of 760 N; and / or, The central part of the main surface of the strengthened glass ceramic with a thickness of 0.9 mm is extruded by a 10 mm diameter round head metal pressing rod, and a vertical downward load is gradually applied on the metal pressing rod at a rate of 10 mm / min, the deformation of the strengthened glass ceramic under a load of 760 N is tested, the strengthened glass ceramic satisfies: the deformation of the stress position of the strengthened glass ceramic to the stress direction is less than 1.850 mm under the extrusion of the load of 760 N; and / or, 27. A cover glass, characterized by The cover plate glass is made of the glass ceramic according to any one of claims 1-17 or the strengthened glass ceramic according to any one of claims 18-26, or the cover plate glass comprises the glass ceramic according to any one of claims 1-17 or the strengthened glass ceramic according to any one of claims 18-26.

28. An electronic device, comprising: The electronic device comprises the glass ceramic according to any one of claims 1-17 or the strengthened glass ceramic according to any one of claims 18-26.

29. The electronic device of claim 28, wherein, The electronic device comprises a housing, and the housing comprises the glass ceramic according to any one of claims 1-17 or the strengthened glass ceramic according to any one of claims 18-26.

30. The electronic device of claim 29, wherein, The housing comprises a display screen cover plate, and the display screen cover plate comprises the glass ceramic according to any one of claims 1-17 or the strengthened glass ceramic according to any one of claims 18-26.

31. The electronic device of claim 29 or 30, wherein, The housing comprises a back cover, and the back cover comprises the glass ceramic according to any one of claims 1-17 or the strengthened glass ceramic according to any one of claims 18-26.

32. The electronic device of any of claims 29-31, wherein, The electronic device further comprises a camera assembly, the housing comprises a camera protection cover plate covering the camera assembly, and the camera protection cover plate comprises the glass ceramic according to any one of claims 1-17 or the strengthened glass ceramic according to any one of claims 18-26.

33. The electronic device of any of claims 28-32, wherein, The electronic device further comprises a middle frame, and the middle frame comprises the glass ceramic according to any one of claims 1-17 or the strengthened glass ceramic according to any one of claims 18-26.

34. A glass article, characterized by, The glass device comprises the glass ceramic according to any one of claims 1-17 or the strengthened glass ceramic according to any one of claims 18-26.

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