Glass ceramic, chemically strengthened glass ceramic and application of chemically strengthened glass ceramic

Abstract

The invention belongs to the technical field of glass ceramics, and particularly relates to glass ceramics, chemically strengthened glass ceramics and application of the chemically strengthened glass ceramics, the glass ceramics comprise a main crystalline phase lithium disilicate crystalline phase and have specific ranges of the content of each oxide, and the composition of the glass ceramics meets the condition that SiO2 / Li2O is larger than or equal to 2.00 and smaller than or equal to 2.40 according to the content expressed by the mole percent of each oxide in the composition of the glass ceramics. The microcrystalline glass provided by the invention has high intrinsic strength and excellent optical performance, and the chemically strengthened microcrystalline glass with high stress level and excellent deformation resistance can be prepared through chemical strengthening.

Description

[0001] Cross-references to related applications

[0002] This application is a divisional application of application number 202410156362.3, filed on February 2, 2024, entitled "A microcrystalline glass, a chemically strengthened microcrystalline glass and its application". Technical Field

[0003] This application belongs to the field of microcrystalline glass technology, specifically relating to a microcrystalline glass with excellent deformation resistance, chemically strengthened microcrystalline glass, and their applications. Background Technology

[0004] With the advent of the smart era, portable electronic devices such as mobile phones, tablets, and watches have become indispensable parts of daily life, and most damage to these devices is caused by screen breakage. With the introduction of microcrystalline glass such as "Kunlun Glass," "Super Ceramic Shield," and "Titan Glass," the probability of cover glass breakage has been significantly reduced. However, the problem of internal screen failure still needs further improvement. If the internal screen fails, it can easily lead to touch malfunctions, display abnormalities, and screen damage. Especially driven by the market demand for larger and thinner electronic devices, cover glass is becoming increasingly thinner. When the cover glass is subjected to pressure or impact, deformation can occur, potentially causing internal screen failure. Therefore, to better address the problem of internal screen failure caused by impacts on the cover glass, it is urgent to develop cover glass with excellent deformation resistance. Summary of the Invention

[0005] Glass-ceramics, as a solid material containing both microcrystalline and glassy phases, exhibit superior overall strength compared to conventional glass due to the large number of nanoscale crystals they contain, which can hinder the propagation of microcracks. Among existing glass-ceramics, those with a lithium disilicate main crystalline phase have great application potential as cover glass in electronic products.

[0006] Lithium disilicate (Li₂Si₂O₅) is an orthorhombic crystal based on a tetrahedral array of [Si₂O₅], with a flat or plate-like shape. Inside glass-ceramics, the lithium disilicate crystals exhibit a randomly oriented, interlocking microstructure, forcing cracks to distort their path as they pass through the crystal, thus preventing crack propagation and improving the strength and fracture toughness of the glass-ceramics. Simultaneously, the refractive index of lithium disilicate crystals is close to that of the glass matrix (e.g., the substrate glass used to prepare glass-ceramics), making it an ideal crystal phase for preparing highly transparent glass-ceramics.

[0007] Therefore, the present application aims to provide a glass-ceramic with high strength and excellent optical properties, taking lithium disilicate as the main crystalline phase, which can be chemically strengthened to obtain a chemically strengthened glass-ceramic with high stress level, excellent deformation resistance and high mechanical strength.

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

[0009] 1. A glass-ceramic, wherein the glass-ceramic comprises lithium disilicate crystalline phase, and the lithium disilicate crystalline phase has a higher weight percentage than other crystalline phases present in the glass-ceramic.

[0010] The composition of the glass-ceramic comprises, in terms of molar percentage of oxides:

[0011] SiO2: 55.00-65.00 mol%, Al2O3: 0.00-2.00 mol%, P2O5: 1.00-3.00 mol%, ZrO2: 2.00-6.00 mol%, MgO: 0.00-2.00 mol%, ZnO: 0.00-2.00 mol%, Na2O: 0.00-3.00 mol%, K2O: 0.00-1.00 mol%, Li2O: 27.00-32.00 mol%, CaO: 0.00-5.00 mol%, B2O3: 0.00-1.00 mol%, SrO: 0.00-2.00 mol%;

[0012] The composition of the glass-ceramic satisfies 2.00≤SiO2 / Li2O≤2.40, preferably 2.00≤SiO2 / Li2O≤2.30, and more preferably 2.02≤SiO2 / Li2O≤2.20, in terms of the content of each oxide in the glass-ceramic composition. By optimizing the glass formula, such as using a higher content of lithium, using a higher content of zirconium, using a lower content of aluminum, etc., while satisfying the specific content relationship between each component, the interaction between each component is achieved. On the one hand, it is beneficial to ensure the precipitation of lithium disilicate crystalline phase with the desired content, limit the precipitation of other crystalline phases (such as petalite crystalline phase), thereby helping to ensure the glass-ceramic with high intrinsic strength and excellent optical properties taking lithium disilicate as the main crystalline phase, on the other hand, it is beneficial to ensure that the glass-ceramic satisfies the specific composition and structure, thereby ensuring that after chemical strengthening, the chemically strengthened glass-ceramic with high stress level and excellent deformation resistance is obtained.

[0013] 2. The glass-ceramic according to claim 1, wherein the composition of the glass-ceramic further satisfies, in terms of the content of each oxide expressed in terms of mole percentage in the composition of the glass-ceramic:

[0014] 0.90≤ SiO2+ Li2O≤ 0.96, preferably 0.90≤ SiO2+ Li2O≤ 0.95; and / or,

[0015] Al2O3 / SiO2≤ 0.030. By adjusting the components to satisfy the specific content relationship, it is beneficial to ensure the formation of the desired crystal phase structure, and also beneficial to increase the stress level generated after chemical strengthening of the glass-ceramic, thereby facilitating the glass-ceramic to obtain high mechanical strength performance and excellent deformation resistance.

[0016] 3. The glass-ceramic according to claim 1 or 2, wherein the composition of the glass-ceramic further satisfies, in terms of the content of each oxide expressed in terms of mole percentage in the composition of the glass-ceramic:

[0017] 0.31≤ ZrO2 / (CaO+ZrO2+Al2O3)≤ 1.50, preferably 0.32≤ ZrO2 / (CaO+ZrO2+Al2O3)≤ 1.20, more preferably 0.36≤ ZrO2 / (CaO+ZrO2+Al2O3)≤ 1.10;

[0018] and / or,

[0019] 0.10≤ ZrO2 / (100%-3xLi2O)≤ 0.60, preferably 0.12≤ ZrO2 / (100%-3xLi2O)≤ 0.52, more preferably 0.16≤ ZrO2 / (100%-3xLi2O)≤ 0.50;

[0020] and / or,

[0021] 0.034≤ ZrO2 / SiO2≤ 0.100, preferably 0.035≤ ZrO2 / SiO2≤ 0.095, more preferably 0.055≤ ZrO2 / SiO2≤ 0.095. By adjusting the components to satisfy the specific content relationship, it is beneficial to exert the strengthening or toughening effect of each component, and to exert the interaction of each component, thereby ensuring the high intrinsic strength of the glass-ceramic and the high stress level after strengthening, and thereby facilitating the glass-ceramic to obtain high mechanical strength performance and excellent deformation resistance.

[0022] 4. The glass-ceramic according to any one of claims 1-3, wherein the composition of the glass-ceramic further satisfies, in terms of the content of each oxide expressed in terms of mole percentage in the composition of the glass-ceramic:

[0023] CaO+Al2O3≤0.065, preferably CaO+Al2O3≤0.055, more preferably CaO+Al2O3≤0.050;

[0024] and / or,

[0025] (CaO+Al2O3) / Li2O≤0.25, preferably (CaO+Al2O3) / Li2O≤0.20, more preferably (CaO+Al2O3) / Li2O≤0.14. By adjusting the components to meet the specific content relationship, it is beneficial to avoid affecting the crystallization of the glass-ceramics while exerting the effects of enhancing each component, thereby ensuring that the glass-ceramics achieve the desired crystal structure, and further facilitating the glass-ceramics to obtain high mechanical strength performance and excellent deformation resistance.

[0026] 5. The glass-ceramics according to any one of technical solutions 1-4, wherein the composition of the glass-ceramics further satisfies, in terms of the content of each oxide in the glass-ceramics composition in mole percentage:

[0027] 0.12≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤6.40, preferably 0.14≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤6.16, more preferably 0.50≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤3.00;

[0028] and / or,

[0029] Na2O / SiO2≤0.05, preferably Na2O / SiO2≤0.04, more preferably Na2O / SiO2≤0.02. By adjusting the components to meet the specific content relationship, it is beneficial to better exert the effects of each component, facilitate the glass-ceramics to obtain high intrinsic strength and excellent optical performance, and also facilitate the glass-ceramics to obtain high stress level and excellent deformation resistance after chemical strengthening.

[0030] 6. The glass-ceramics according to any one of technical solutions 1-5, wherein in the glass-ceramics, in terms of mole percentage of oxides:

[0031] the content of SiO2 is 60.00-65.00 mol%, preferably the content of SiO2 is 60.50-64.00 mol%; and / or,

[0032] the content of Li2O is 28.00-31.00 mol%, preferably the content of Li2O is 29.00-30.50 mol%; and / or,

[0033] the content of ZrO2 is 3.20mol%-6.00mol%, preferably the content of ZrO2 is 4.00mol%-6.00mol%; and / or,

[0034] the content of P2O5 is 1.50mol%-3.00mol%, preferably the content of P2O5 is 1.50mol%-2.50mol%; and / or,

[0035] the content of Na2O is 0.00mol%-1.00mol%, preferably the content of Na2O is 0.00mol%-0.50mol%; and / or,

[0036] the content of CaO is 0.00mol%-4.00mol%, preferably the content of CaO is 0.00mol%-2.50mol%. By adjusting the composition of the glass-ceramics, it is beneficial to make the glass-ceramics obtain high mechanical strength performance and excellent deformation resistance.

[0037] 7. The glass-ceramics according to any one of technical solutions 1-6, wherein the composition of the glass-ceramics further comprises, in terms of mole percentage of oxides: Y2O3: 0.00mol%-1.00mol%, La2O3: 0.00mol%-1.00mol%, Ta2O5: 0.00mol%-1.00mol%. The appropriate amount of selectively added Y2O3, La2O3 or Ta2O5 helps to increase the density of the glass-ceramics and increase its Young's modulus, but at the same time it can also increase the refractive index of the glass-ceramics, which reduces the optical performance of the glass-ceramics.

[0038] 8. The glass-ceramics according to any one of technical solutions 1-7, wherein in the glass-ceramics: the sum of the mole percentage content of Na2O and K2O is less than 1.00mol%.

[0039] 9. The glass-ceramics according to any one of technical solutions 1-8, wherein the density p of the glass-ceramics is ≥2.50g / cm 3 , preferably the density p of the glass-ceramics is 2.50g / cm 3 -2.75g / cm 3 ; and / or the refractive index of the glass-ceramics is ≤1.60. The glass-ceramics meeting the density and / or refractive index can ensure higher intrinsic strength and excellent optical performance.

[0040] 10. The glass-ceramics according to any one of technical solutions 1-9, wherein the crystallinity of the glass-ceramics is 30.00wt%-90.00wt%, preferably the crystallinity is 50.00wt%-90.00wt%, the crystallinity is 65.00wt%-90.00wt%.

[0041] and / or,

[0042] The average crystal size in the glass-ceramics is ≤100 nm, preferably the average crystal size is ≤50 nm, and more preferably the average crystal size is 15-45 nm. A higher content of crystalline phase is beneficial to improve the mechanical strength performance of the glass-ceramics, and a smaller average crystal size is beneficial to ensure excellent optical performance of the glass-ceramics.

[0043] 11. The glass-ceramics according to any one of technical solutions 1-10, wherein the Young's modulus of the glass-ceramics is ≥100.00 GPa, preferably the Young's modulus of the glass-ceramics is ≥110.00 GPa, and more preferably the Young's modulus of the glass-ceramics is 114-130 GPa. A higher Young's modulus indicates that the glass-ceramics has a higher intrinsic strength, which is beneficial to obtain a higher mechanical strength performance and excellent deformation resistance.

[0044] 12. The glass-ceramics according to any one of technical solutions 1-11, wherein the b value of the glass-ceramics is ≤1.0, preferably the b value is ≤0.8, at a thickness of 0.5 mm; and / or,

[0045] The glass-ceramics is transparent in the visible light range, and the transmittance of the glass-ceramics is ≥85.00% for light with a wavelength of 550 nm, preferably the transmittance of the glass-ceramics is ≥90.00%, at a thickness of 0.5 mm. The glass-ceramics satisfying the optical b value and / or the transmittance can ensure a better optical performance and display effect, and is suitable for use in a display screen with a requirement for display effect.

[0046] 13. The glass-ceramics according to any one of technical solutions 1-12, wherein the dilatometric softening point of the glass-ceramics is 750-850℃, preferably the dilatometric softening point of the glass-ceramics is 750-830℃. A suitable dilatometric softening point is beneficial to 3D hot bending forming of the glass-ceramics to obtain a 3D curved glass-ceramics with high strength performance.

[0047] 14. A chemically strengthened glass-ceramics, wherein the composition at the center of the chemically strengthened glass-ceramics is the same as the composition of the glass-ceramics according to any one of technical solutions 1-13, the chemically strengthened glass-ceramics comprises a compressive stress layer region extending from the surface of the chemically strengthened glass-ceramics to a compressive depth, and has a tensile stress in the interior of the chemically strengthened glass-ceramics.

[0048] 15. The chemically strengthened glass-ceramic according to claim 14, wherein the chemically strengthened glass-ceramic comprises lithium disilicate crystalline phase, wherein the lithium disilicate crystalline phase has a higher weight percentage than other crystalline phases present in the chemically strengthened glass-ceramic; the composition at the center of the chemically strengthened glass-ceramic comprises, in mole percent of oxides: SiO2: 55.00-65.00 mol%, Al2O3: 0.00-2.00 mol%, P2O5: 1.00-3.00 mol%, ZrO2: 2.00-6.00 mol%, MgO: 0.00-2.00 mol%, ZnO: 0.00-2.00 mol%, Na2O: 0.00-3.00 mol%, K2O: 0.00-1.00 mol%, Li2O: 27.00-32.00 mol%, CaO: 0.00-5.00 mol%, B2O3: 0.00-1.00 mol%, SrO: 0.00-2.00 mol%.

[0049] The composition at the center of the chemically strengthened glass-ceramic satisfies, in content expressed in mole percent of oxides: 2.00≤SiO2 / Li2O≤2.40, preferably 2.00≤SiO2 / Li2O≤2.30, more preferably 2.02≤SiO2 / Li2O≤2.20.

[0050] 16. The chemically strengthened glass-ceramic according to claim 14 or 15, wherein the composition at the center of the chemically strengthened glass-ceramic further satisfies, in content expressed in mole percent of oxides:

[0051] 0.90≤SiO2+Li2O≤0.96; and / or,

[0052] Al2O3 / SiO2≤0.030; and / or,

[0053] 0.31≤ZrO2 / (CaO+ZrO2+Al2O3)≤1.50; and / or,

[0054] 0.10≤ZrO2 / (100%-3xLi2O)≤0.60; and / or,

[0055] 0.034≤ZrO2 / SiO2≤0.100; and / or,

[0056] CaO+Al2O3≤0.065; and / or,

[0057] (CaO+Al2O3) / Li2O≤0.25; and / or,

[0058] 0.12≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤6.40; and / or,

[0059] Na2O / SiO2≤0.05.

[0060] 17. The chemically strengthened glass-ceramic according to any one of solutions 14-16, wherein the composition at the center of the chemically strengthened glass-ceramic comprises, in mole percent on an oxide basis:

[0061] SiO2in an amount of 60.00-65.00 mol%, preferably SiO2in an amount of 60.50-64.00 mol%; and / or, Li2O in an amount of 28.00-31.00 mol%, preferably Li2O in an amount of 29.00-30.50 mol%; and / or, ZrO2in an amount of 3.20-6.00 mol%, preferably ZrO2in an amount of 4.00-6.00 mol%; and / or, P2O5in an amount of 1.50-3.00 mol%, preferably P2O5in an amount of 1.50-2.50 mol%; and / or, Na2O in an amount of 0.00-1.00 mol%, preferably Na2O in an amount of 0.00-0.50 mol%; and / or, CaO in an amount of 0.00-4.00 mol%, preferably CaO in an amount of 0.00-2.50 mol%.

[0062] 18. The chemically strengthened glass-ceramic according to any one of solutions 14-17, wherein the composition at the center of the chemically strengthened glass-ceramic further comprises, in mole percent on an oxide basis: Y2O3: 0.00-1.00 mol%; La2O3: 0.00-1.00 mol%; Ta2O5: 0.00-1.00 mol%.

[0063] 19. The chemically strengthened glass-ceramic according to any one of solutions 14-18, wherein the chemically strengthened glass-ceramic has a DOL_0 of 0.18t-0.25t, preferably the chemically strengthened glass-ceramic has a DOL_0 of 0.20t-0.25t, DOL_0 is the depth of compressive stress layer, and t is the thickness of the chemically strengthened glass-ceramic. The DOL_0 of the chemically strengthened glass-ceramic within the above range indicates that the chemically strengthened glass-ceramic has a high depth of compressive stress layer, which is more conducive to offsetting the energy driving crack propagation, thereby ensuring that it has excellent damage resistance and excellent deformation resistance.

[0064] 20. The chemically strengthened glass-ceramic according to any one of solutions 14-19, wherein the chemically strengthened glass-ceramic has a |CT_AV| of 85 MPa to 200 MPa, preferably a |CT_AV| of 90 MPa to 200 MPa, more preferably a |CT_AV| of 130 MPa to 200 MPa, |CT_AV| being the absolute value of the average tensile stress. The |CT_AV| of the chemically strengthened glass-ceramic in the above range indicates that the chemically strengthened glass-ceramic has a high level of tensile stress, which reflects that it has a high level of surface stress, and the higher level of surface compressive stress can offset more residual energy of drop impact, thereby ensuring that it has excellent damage resistance and excellent deformation resistance.

[0065] 21. The chemically strengthened glass-ceramic according to any one of solutions 14-20, wherein the chemically strengthened glass-ceramic has a CT_LD of 50000 MPa / mm to 100000 MPa / mm, preferably a CT_LD of 55000 MPa / mm to 100000 MPa / mm, more preferably a CT_LD of 65000 MPa / mm to 100000 MPa / mm, CT_LD being the tensile stress line density. The CT_LD of the chemically strengthened glass-ceramic in the above range indicates that the chemically strengthened glass-ceramic has a high level of tensile stress stored therein, which reflects that it has a high level of surface stress, thereby ensuring that it has excellent damage resistance and excellent deformation resistance.

[0066] 22. The chemically strengthened glass-ceramic according to any one of solutions 14-21, wherein the chemically strengthened glass-ceramic has a |CT_CV| of 120 MPa to 320 MPa, preferably a |CT_CV| of 135 MPa to 300 MPa, more preferably a |CT_CV| of 160 MPa to 300 MPa. The |CT_CV| of the chemically strengthened glass-ceramic in the above range indicates that the chemically strengthened glass-ceramic has a high level of tensile stress, which reflects that it has a high level of surface stress, and the higher level of surface compressive stress can offset more residual energy of drop impact, thereby ensuring that it has excellent damage resistance and excellent deformation resistance.

[0067] 23. The chemically strengthened glass-ceramic according to any one of solutions 14-22, wherein the chemically strengthened glass-ceramic has a Vickers hardness of greater than or equal to 680 kgf / mm 2 , preferably a Vickers hardness of 700 kgf / mm2 -800kgf / mm 2 The Vickers hardness of the chemically strengthened microcrystalline glass is in the above range, which indicates that the chemically strengthened microcrystalline glass has high hardness, thereby ensuring excellent mechanical properties thereof.

[0068] 24. The chemically strengthened microcrystalline glass according to any one of technical solutions 14-23, wherein, under a thickness of 0.5 mm, a deformation amount of a force-receiving position of the chemically strengthened microcrystalline glass to a force-receiving direction is ≤0.850 mm when the chemically strengthened microcrystalline glass is pressed at the center of a main surface thereof by a 10 kgf load using a 10 mm diameter round head metal press rod. The smaller the deformation amount of the chemically strengthened microcrystalline glass after being pressed, the more excellent the anti-deformation ability thereof is, and when the chemically strengthened microcrystalline glass is used as a cover glass of a display screen, the smaller the deformation after being pressed or impacted, the smaller the probability of contacting an in-glass screen is, thereby improving the problem of in-glass screen failure caused by the impact on the cover glass.

[0069] 25. The chemically strengthened microcrystalline glass according to any one of technical solutions 14-24, wherein, under a thickness of 0.5 mm, a load borne by the chemically strengthened microcrystalline glass at the center of a main surface thereof is ≥30 N when a deformation amount of the center of the main surface of the chemically strengthened microcrystalline glass to a force-receiving direction is 0.400 mm. The larger the load borne by the chemically strengthened microcrystalline glass when a certain deformation amount occurs, the larger the load that can be offset by the deformation of the chemically strengthened microcrystalline glass when the chemically strengthened microcrystalline glass is pressed or impacted, and thus the smaller the pressing or impact load borne by the in-glass screen when the chemically strengthened microcrystalline glass contacts the in-glass screen due to deformation, thereby reducing the possibility of in-glass screen failure. The use of the chemically strengthened microcrystalline glass capable of bearing or offsetting a large load as a cover glass helps to improve the problem of in-glass screen failure caused by the impact or pressing on the cover glass.

[0070] 26. A glass device, wherein the glass device comprises the microcrystalline glass according to any one of technical solutions 1-13 or comprises the chemically strengthened microcrystalline glass according to any one of technical solutions 14-25.

[0071] 27. An electronic device, wherein the electronic device comprises the microcrystalline glass according to any one of technical solutions 1-13 or comprises the chemically strengthened microcrystalline glass according to any one of technical solutions 14-25.

[0072] Beneficial effects:

[0073] In the present application, by making the microcrystalline glass containing the main crystalline phase lithium disilicate meet specific composition and structure, especially meet specific oxide content and specific oxide content relationship under specific conditions, not only ensures that the microcrystalline glass has high intrinsic strength and excellent optical performance, but also ensures that the microcrystalline glass can be prepared by chemical strengthening to obtain a chemical strengthening microcrystalline glass with high stress level (such as high CT_LD, |CT_AV|, DOL_0, etc.) and excellent deformation resistance. The chemical strengthening microcrystalline glass prepared by using the microcrystalline glass of the present application can well overcome the problem that the in-cell screen is easily deformed and extruded by the cover glass in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0074] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0075] Figure 1 DSC curve of the substrate glass of Example 3.

[0076] Figure 2 XRD spectrum of the microcrystalline glass of Example 3.

[0077] Figure 3 Transmittance curve of the microcrystalline glass of Example 3.

[0078] Figure 4 Load deformation curve of the chemical strengthening microcrystalline glass of Example 3.

[0079] Figure 5 Load deformation curve of the chemical strengthening microcrystalline glass of Comparative Example 3. DETAILED DESCRIPTION

[0080] The endpoints of the ranges and any values disclosed herein are not limited to the precise values recited as the exact dimensions are not considered critical for the present application. The ranges are understood to include values near the recited endpoints, as well as the exact values themselves. For values that are ranges, the endpoints of the ranges are understood to be combinable with other ranges or points to create other ranges that are not expressly recited. The terms "optional" or "optionally" mean that the subsequently described event or circumstance can or can not occur, or that the subsequently described feature, characteristic, structure, or parameter may or may not be present.

[0081] Glossary and test methods:

[0082] Base glass: a glass that has not been subjected to nucleation treatment, crystallization treatment, and strengthening treatment.

[0083] Glass-ceramic: also known as glass ceramic, is a kind of solid composite material containing both glass phase and crystal phase (or also known as microcrystalline phase, crystalline phase) prepared by targeted controlled crystallization of base glass.

[0084] Chemically strengthened glass-ceramic: refers to a solid composite material obtained after chemical strengthening treatment of glass-ceramic. During high-temperature chemical strengthening treatment, alkali metal ions with large ionic radius (such as potassium ions or sodium ions) in the molten salt bath will replace alkali metal ions with small ionic radius (such as sodium ions or lithium ions) in the glass-ceramic, thereby generating an exchange ion volume difference and generating a compressive stress (or also known as compression stress) on the surface of the glass-ceramic.

[0085] Main crystal phase or primary crystal phase: refers to a crystal phase with a higher weight content than other crystal phases present in the glass-ceramic.

[0086] Main surface: refers to the surface with the largest surface area in a glass brick or glass sheet, such as the upper and lower surfaces of a cover glass.

[0087] Crystallinity: 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 known as the total content of crystal phase in the glass-ceramic.

[0088] Refractive index: refers to the ratio of the propagation speed of light in vacuum to the propagation speed of light in the medium.

[0089] Transmittance: when light of a certain wavelength is incident on the surface of a glass, 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.

[0090] SOC: photoelastic coefficient. Photoelasticity mainly refers to the anisotropy and birefringence phenomenon that occurs in transparent materials under stress. Through photoelastic coefficient and birefringence measurement, the value of the internal residual stress (unit: MPa) of the material can be obtained.

[0091] CT_LD: refers to the tensile stress line density, with the unit of MPa / mm. It should be understood that after the glass-ceramic is placed in a molten salt bath for ion exchange, a compressive stress layer (or also known as compression stress layer) will be formed on the surface of the glass-ceramic, and a tensile stress layer (or also known as tensile stress layer) will be formed inside the glass-ceramic. For example, during chemical strengthening, alkali metal ions with large ionic radius in the molten salt bath are ion exchanged with alkali metal ions with small ionic radius in the glass-ceramic, thereby forming a compressive stress layer on the surface of the glass-ceramic and a tensile stress layer inside the glass-ceramic. In this application, CT_LD is calculated by the following formula:

[0092]

[0093] wherein t is the thickness of the chemically strengthened glass-ceramic in mm; DOL_0 is the depth of compressive stress layer of the chemically strengthened glass-ceramic in pm; |CT_AV| is the absolute value of the average tensile stress of the chemically strengthened glass-ceramic in MPa. It should be understood that the data is substituted into the formula of the tensile stress linear density according to the above unit requirements, and the calculation result is obtained, and the unit does not participate in the calculation.

[0094] |CT_CV|: refers to the absolute value of the maximum tensile stress, in MPa, 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 test.

[0095] |CT_AV|: refers to the absolute value of the average tensile stress, in MPa, specifically refers to the absolute value of the average value of all tensile stresses in the tensile stress layer, which is obtained by SLP-2000 stress meter test.

[0096] DOL_0: refers to the depth of compressive stress layer, or the depth of compressive stress layer, specifically refers to the distance from any main surface of the chemically strengthened glass-ceramic to the position close to the surface where the compressive stress is zero, which is obtained by SLP-2000 stress meter test.

[0097] b value: used to characterize the yellow-blue value of the material. The optical b value in the present application is the transmission light b value, and the positive optical b value indicates that the material is blue.

[0098] Vickers hardness: Vickers hardness refers to a standard for indicating the hardness of a material proposed by Robert L. Smith and George E. Sandland of Vickers Ltd in 1921.

[0099] Crystallization upper limit temperature: the crystallization upper limit temperature refers to the highest temperature at which the base material glass produces crystallization. Above this temperature, the base material glass will not crystallize.

[0100] Glass thickness: measured by micrometer. It should be understood that in the thickness direction, the ion exchange degree changes from the surface to the center in a gradient, and the total Na-K and / or Li-Na exchange amount is generally not more than 1.5% of the total mass of the sample, and the difference in ion radius is pm level, so the expansion effect in the thickness direction is extremely slight, and the thickness can be approximately considered as unchanged. That is, the thickness of the glass-ceramic changes very little before and after chemical strengthening, which can be ignored.

[0101] Glass sheet size measurement: tested by a two-dimensional measuring machine (instrument model Miyu MY-YXCL-4030).

[0102] XRD test: The microcrystalline glass or chemically strengthened microcrystalline glass of the present application is crushed and ground into a sample with a particle size of less than 75 μm, and the ground sample is tested by an X-ray diffractometer to obtain an XRD diffraction peak curve and XRD diffraction data. The X-ray diffractometer used in the present application is Shimadzu XRD-6100, the incident angle range used for testing is 2θ = 10°-60°, the scanning speed is 0.2° / min, the working voltage is 40 kV, and the working current is 30 mA.

[0103] Determination of crystalline phase: The XRD diffraction data is analyzed by Jade software (JADE Standard 8.6) to determine the crystalline phase in the sample.

[0104] Determination of crystallinity: The test results of XRD (RAW format) are imported into the X-ray diffraction data Rietveld refinement software Jade for fitting and calculation, i.e. the crystallinity of the sample can be determined. Specifically, the ratio of the peak area of the fitted crystalline phase to the total peak area of the fitting is recorded as the crystallinity of the sample.

[0105] Determination of average crystal size: The result data obtained by XRD test can be used to calculate the average crystal size of the sample according to the Scherrer formula D = Kλ / (βcosθ). Wherein, λ is the X-ray wavelength, λ = 0.154056 nm, β is the half-height width of the diffraction peak, K = 0.89, and θ is the Bragg diffraction angle. Specifically, the RAW format file output by the XRD instrument is curve-fitted in Jade software, and the Jade outputs a fitting report. According to the angle 2θ value and the Peak FWHM value corresponding to each diffraction peak in the fitting report, the Peak FWHM value is converted to radian: β = (FWHM / 180×3.14), and the crystal size of each diffraction peak is calculated by the Scherrer formula D = Kλ / (βcosθ) and then averaged to obtain the average crystal size in the sample.

[0106] Transmittance and optical b value test: The transmittance and optical b value of the microcrystalline glass of the present application were tested by referring to the national standard GB / T 7962.12-2010 Colorless optical glass Test methods Part 12: Spectral transmittance. Specifically, the transmittance and optical b value of light of different wavelengths of 5 pieces of microcrystalline glass of the same batch were tested by using a haze meter. The average value of the optical b values of the 5 pieces of microcrystalline glass was taken as the optical b value result of the microcrystalline glass. The average value of the transmittance of the 5 pieces of microcrystalline glass at a wavelength of 550 nm was taken as the transmittance result of the microcrystalline glass at a wavelength of 550 nm. The haze meter used in the test of the present application is a Konica Minolta Spectrophotometer CM-3600A from Japan, the light receiving optical system is transmission, the spectral method is plane diffraction grating, the wavelength range is 360-740 nm, the wavelength interval is 10 nm, the illumination light source is pulse xenon lamp X4, the environmental temperature for placing the instrument is 24℃, and the air humidity is 40%.

[0107] Density: The density of the microcrystalline glass was tested by using an electronic density balance SD-200L from Japan ALFAMIRAGE.

[0108] Refractive index: The refractive index of the microcrystalline glass was determined by using an Abbe refractometer WYA-2WAJ.

[0109] Expansion softening point temperature: The sample was prepared into a cylinder with a diameter of 5.5 mm and a length of 20 mm, and the sample was tested by using a thermal dilatometer LINSEIS L75VD1000. The thermal expansion coefficient test curve was output, and the temperature corresponding to the point at which the curve began to show a downward trend with the increase of temperature was recorded as the expansion softening point temperature of the sample.

[0110] Young's modulus: The Young's modulus of the microcrystalline glass was tested by using a UMS-100 ultrasonic material characterization system.

[0111] Crystallization upper limit temperature: the base glass is knocked into small pieces, then put into a long quartz tank and fully laid. The gradient furnace of model JKZC-XJY01 is set to a temperature interval, such as 1050℃-1225℃, and at least 6 temperature points are taken from high to low in each temperature interval. After the gradient furnace reaches the preset temperature interval, the long quartz tank with the sample is placed in the gradient furnace, so that the 6 temperature points correspond to the glass samples at 6 positions in the long quartz tank. After the long quartz tank is placed in the gradient furnace for constant temperature for 60-70 min, the long quartz tank is taken out. The glass samples at different positions in the long quartz tank are observed by microscope or magnifying glass. If the glass sample appears to lose transparency and mist, it is determined that the glass sample crystallizes at this position. If the glass sample is completely transparent, it is determined that the glass sample does not crystallize at this position. The crystallization upper limit temperature range is between the temperature point corresponding to the completely transparent sample and the adjacent temperature point corresponding to the sample losing transparency or mist, and the average of the two temperature points is recorded as the crystallization upper limit temperature. If all the glass samples in the long quartz tank crystallize or do not crystallize in the temperature interval set by the gradient furnace, the temperature interval of the gradient furnace is reset, and the crystallization upper limit temperature of the glass sample is determined.

[0112] Vickers hardness test: the chemically strengthened glass-ceramics is made into a small piece with a length of 50 mm, a width of 50 mm, and a thickness of 0.5 mm, and a glass sample piece with a clean surface and no visible scratches, pits, cracks and other damages is selected as a test sample, and then a Vickers hardness tester is used to measure the Vickers hardness. The Vickers hardness tester used in the test is a digital small load Vickers hardness tester of model VTD405 from Beijing Kewei Technology Co., Ltd. Test conditions: load 300 gf, loading time 10 s, and the validity of the indentation meets the standard of GB / T 37900-2019 Ultra-thin glass hardness and fracture toughness test method Small load Vickers hardness indentation method. Three different positions on the surface of the same test sample are selected for measurement, and the average of the three measurement results is recorded as the Vickers hardness result of the test sample.

[0113] Simultaneous thermal analysis test: the base glass is crushed, ground and sieved through a 200 mesh sieve to obtain a sample, and then about 20 mg of the sample is weighed. A differential thermal analysis instrument is used to heat the sample from room temperature to 1100℃ at a heating rate of 10℃ / min under a nitrogen protective atmosphere to obtain a DSC test curve of the sample. The differential thermal analysis instrument used in the present application is a Mettler Toledo TGA / DSC3+ thermal gravimetric and simultaneous thermal analysis instrument, the standard material used in the test is α-Al2O3 powder, the container for placing the sample is a platinum crucible, and the environmental temperature of the instrument is 24℃, and the air humidity is ≤40%.

[0114] Stress test: In this application, SLP 2000 (Japan Luceo) stress tester is used to test the |CT_CV|, DOL_0, |CT_AV| of the chemically strengthened glass-ceramics. The related parameters of the stress tester are set as follows: light source wavelength is 518 nm, SOC (photoelastic coefficient) is set to 25.5, refractive index is set according to the refractive index value of the sample to be tested, and exposure time is 300 μsec. Then, the tensile stress linear density (CT_LD) value of the chemically strengthened glass-ceramics is calculated through the aforementioned calculation formula of the tensile stress linear density.

[0115] Deformation test: The test is carried out by using the monomer strength test method. Specifically, the chemically strengthened glass-ceramics is placed on the bottom ring of the tensile testing machine (LT_850A), the round head part of the pressure rod is in contact with the center of the main surface of the chemically strengthened glass-ceramics, the moving speed of the pressure rod is set to 50 mm / min, the test software is started, the start test is clicked, the curve of the applied load and the corresponding deformation is recorded by the test software, and the deformation of the chemically strengthened glass-ceramics at 10 kgf load is read. Here, the deformation refers to the displacement of the stress point position of the main surface of the chemically strengthened glass-ceramics in the stress direction. The pressure rod used in this test method is a metal pressure rod with a diameter of 10 mm, and the round head of the pressure rod is a hemisphere with a diameter of 10 mm.

[0116] Test of the load borne when a certain amount of deformation occurs: Here, the "borne load" refers to the load required to be applied to the stress point position of the main surface of the chemically strengthened glass-ceramics along the stress direction to cause a corresponding deformation.

[0117] The test method of the "borne load" is the same as the test method of the deformation, and the test is carried out by using the monomer strength test method. Specifically, the chemically strengthened glass-ceramics is placed on the bottom ring of the tensile testing machine (LT_850A), the round head part of the pressure rod is in contact with the center of the main surface of the chemically strengthened glass-ceramics, the moving speed of the pressure rod is set to 50 mm / min, the test software is started, the start test is clicked, the curve of the applied load and the corresponding deformation is recorded by the test software, and the load required to be applied to the chemically strengthened glass-ceramics sample when the deformation is 0.40 mm is read. It is recorded as the "borne load" (or also can be called the load offset when the deformation) of the center of the main surface of the chemically strengthened glass-ceramics when the deformation is 0.40 mm. The pressure rod used in this test method is a metal pressure rod with a diameter of 10 mm, and the round head of the pressure rod is a hemisphere with a diameter of 10 mm.

[0118] Without being bound by any theory, it is presumed that the process of glass deformation is actually a process of stress offset, when the cover glass is subjected to a certain deformation, the greater the stress offset, the smaller the force transmitted to the inner glass screen under the same impact, that is, the smaller the pressure on the inner glass screen, which is more conducive to avoiding the failure of the inner glass screen. Similarly, when the cover glass is subjected to a certain force, the smaller the deformation, the more difficult it is to squeeze the inner glass screen, and thus the more difficult it is to cause the failure of the inner glass screen.

[0119] Therefore, in the present application, a microcrystalline glass with high mechanical strength, excellent optical performance and excellent deformation resistance, whose main crystal phase is lithium disilicate, a chemically strengthened microcrystalline glass and applications thereof are provided. The microcrystalline glass provided in the present application can obtain a chemically strengthened microcrystalline glass with a high stress level after chemical strengthening.

[0120] As described above, in some embodiments of the present application, a microcrystalline glass is provided, which contains a lithium disilicate crystal phase, wherein the lithium disilicate crystal phase has a higher weight percentage than other crystal phases present in the microcrystalline glass; the composition of the microcrystalline glass comprises, in terms of mole percentage of oxides:

[0121] SiO2: 55.00-65.00 mol%, Al2O3: 0.00-2.00 mol%, P2O5: 1.00-3.00 mol%, ZrO2: 2.00-6.00 mol%, MgO: 0.00-2.00 mol%, ZnO: 0.00-2.00 mol%, Na2O: 0.00-3.00 mol%, K2O: 0.00-1.00 mol%, Li2O: 27.00-32.00 mol%, CaO: 0.00-5.00 mol%, B2O3: 0.00-1.00 mol%, SrO: 0.00-2.00 mol%;

[0122] The composition of the microcrystalline glass satisfies: 2.00≤SiO2 / Li2O≤2.40, in terms of the content of each oxide in the microcrystalline glass composition.

[0123] In the present application, by optimizing the glass formula, such as, at a higher content of lithium, using a higher content of zirconium, using a lower content of aluminum, etc., while meeting specific content relationships between each component, and making each component interact with each other, on the one hand, it is beneficial to ensure the precipitation of lithium disilicate crystal phase with desired content, limit the precipitation of other crystal phases (such as petalite crystal phase), thereby helping to ensure that the glass-ceramic with lithium disilicate as the main crystal phase has high intrinsic strength and excellent optical performance, on the other hand, it is beneficial to ensure that the glass-ceramic meets specific composition and structure, thereby ensuring that after chemical strengthening, the chemical strengthened glass-ceramic with high stress level and excellent deformation resistance is prepared.

[0124] In some embodiments, the value of SiO2 / Li2O in the glass-ceramic, calculated in terms of mole percent of oxide, may, for example, be 2.00, 2.01, 2.02, 2.05, 2.06, 2.07, 2.08, 2.09, 2.10, 2.11, 2.12, 2.13, 2.14, 2.15, 2.16, 2.17, 2.18, 2.19, 2.20, 2.25, 2.30 or 2.40, or may be a value within a value range with any two of the above specific values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present application can be obtained. Using a composition that meets this relationship is beneficial to reduce the crystal size in the glass-ceramic, and is beneficial to improve the optical performance of the glass-ceramic; at the same time, it is beneficial to ensure the precipitation of lithium disilicate crystal as the main crystal phase, and can effectively reduce the precipitation of other crystal phases (such as petalite crystal), which is beneficial to ensure that the glass-ceramic has high intrinsic strength, and is also beneficial to enable the glass-ceramic to have high stress level after chemical strengthening.

[0125] In the glass system of the present application, SiO2 is a network former oxide of the glass network and is an indispensable component of the glass network structure. At the same time, SiO2 is also essential as an important component of lithium disilicate (Li2Si2O5) crystal phase. Appropriately increasing the content of SiO2 can increase the structural stability and mechanical strength of the glass, while ensuring the precipitation of lithium disilicate crystal phase with desired content. However, excessive SiO2 will increase the viscosity of the base glass, making the glass melting more difficult, thereby reducing the formability of the base glass. Therefore, in order to ensure good forming and crystallization effect, the mole percent of SiO2 is controlled at 55.00-65.00 mol%, preferably, the mole percent of SiO2 is 60.00-65.00 mol%.

[0126] In some embodiments, the glass-ceramic can comprise 55.00-65.00 mol%, 58.00-64.00 mol%, 60.00-65.00 mol%, 61.00-64.00 mol%, 60.50-64.00 mol%, 61.50-63.50 mol%, 62.00-64.00 mol%, 63.00-64.00 mol%, or 63.00-65.00 mol% of Si02. In some embodiments, the glass-ceramic can comprise 55.00 mol%, 56.00 mol%, 57.00 mol%, 58.00 mol%, 59.00 mol%, 60.00 mol%, 61.00 mol%, 62.00 mol%, 63.00 mol%, 64.00 mol%, 62.55 mol%, 62.58 mol%, 61.82 mol%, 61.72 mol%, 61.87 mol%, 61.76 mol%, 62.59 mol%, 61.15 mol%, 61.25 mol%, 61.06 mol%, 63.17 mol%, 62.77 mol%, 63.39 mol%, 63.17 mol%, 63.16 mol%, 62.01 mol%, or 65.00 mol% of Si02, or a range of values between any two of the above-mentioned specific values, as long as the glass-ceramic or chemically 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 the glass-ceramic or chemically strengthened glass-ceramic with desired properties of the present application can be obtained.

[0127] In the glass system of the present application, Al203is an optional component. The addition of an appropriate amount of Al203helps to stabilize the glass network structure and also helps to promote the ion exchange to some extent during the chemical strengthening process. However, an excessive amount of Al203will increase the viscosity of the glass and also easily lead to the precipitation of other crystalline phases, such as petalite, which will reduce the content of the lithium disilicate crystalline phase and affect the interlocking structure of lithium disilicate. Therefore, the mole percentage of Al203is controlled to be 0.00-2.00 mol%.

[0128] In some embodiments, the glass-ceramics can comprise 0.00-2.00 mol%, 0.00-1.60 mol%, 0.00-1.00 mol%, 0.50-1.60 mol%, 0.50-1.00 mol%, 0.00-0.50 mol%, 1.20-1.60 mol%, 0.00-1.30 mol%, 0.00-1.20 mol%, or 1.00-2.00 mol% of AI2O3. In some embodiments, the glass-ceramics can comprise 0.00 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.80 mol%, 1.55 mol%, 1.38 mol%, 1.41 mol%, 1.37 mol%, 1.39 mol%, 1.43 mol%, 1.23 mol%, 1.42 mol%, or 2.00 mol% of AI2O3, or a range of values between any two of the above specifically named values, as long as the glass-ceramics or chemically strengthened glass-ceramics of the present application have the desired properties. It is understood that any of the above ranges can be combined with any other range, as long as the glass-ceramics or chemically strengthened glass-ceramics of the present application have the desired properties.

[0129] In the glass system of the present application, P2O5 is an essential part as a nucleating agent. Too little or too much P2O5 will result in poor crystallization and affect the optical properties of the glass-ceramics, such as reducing the transparency of the glass-ceramics. Therefore, the mole percentage of P2O5 is controlled at 1.00-3.00 mol%, preferably 1.50-2.50 mol%.

[0130] In some embodiments, the glass-ceramic can include 1.00-3.00 mol%, 1.50-3.00 mol%, 1.60-2.80 mol%, 1.50-2.50 mol%, 1.60-2.10 mol%, 1.70-2.20 mol%, 1.50-1.60 mol%, 1.70-3.00 mol%, 1.60-2.50 mol%, 1.70-2.30 mol%, 1.80-2.00 mol%, 2.00-3.00 mol%, 1.80-1.90 mol%, 1.60-1.90 mol%, 1.70-1.90 mol%, 1.75-1.95 mol%, or 1.50-2.00 mol% P2O5. In some embodiments, the glass-ceramic can include 1.00 mol%, 1.20 mol%, 1.50 mol%, 1.70 mol%, 1.75 mol%, 1.80 mol%, 1.85 mol%, 1.95 mol%, 2.00 mol%, 2.10 mol%, 2.20 mol%, 2.30 mol%, 2.40 mol%, 2.50 mol%, 2.60 mol%, 2.80 mol%, 2.06 mol%, 1.87 mol%, 1.88 mol%, 1.86 mol%, 1.83 mol%, 1.89 mol%, 1.74 mol%, 1.51 mol%, or 3.00 mol% P2O5, or a range of P2O5 between any two of the foregoing specific values, as long as the glass-ceramic or chemically strengthened glass-ceramic of the present application has the desired properties. It is understood that any of the foregoing ranges can be combined with any other range, as long as the glass-ceramic or chemically strengthened glass-ceramic of the present application has the desired properties.

[0131] In the glass system of the present application, ZrO2 is an intermediate oxide for glass formation, which mainly acts as a nucleating agent and a toughening agent to reduce the grain size and increase the toughness of the glass-ceramic. However, when the content of ZrO2 is too high, the melting of the base glass becomes difficult, such as the appearance of a large amount of white precipitates in the base glass, which is not conducive to obtaining a glass-ceramic with excellent optical properties. Therefore, the mole percentage of ZrO2 is controlled to be 2.00-6.00 mol%, preferably 3.20-6.00 mol%.

[0132] In some embodiments, the glass-ceramic can comprise 2.00-6.00 mol%, 2.30-5.80 mol%, 2.50-5.50 mol%, 2.80-5.30 mol%, 2.90-5.10 mol%, 3.00-5.50 mol%, 3.10-4.80 mol%, 4.80-6.00 mol%, 4.00-6.00 mol%, 3.20-5.30 mol%, 3.50-5.00 mol%, 3.50-5.80 mol%, 4.00-5.00 mol%, or 3.20-6.00 mol% Zr02. In some embodiments, the glass-ceramic can comprise 2.00 mol%, 2.30 mol%, 2.50 mol%, 2.70 mol%, 2.90 mol%, 3.00 mol%, 3.10 mol%, 3.30 mol%, 3.50 mol%, 4.00 mol%, 4.50 mol%, 5.00 mol%, 5.50 mol%, 5.80 mol%, 2.58 mol%, 4.68 mol%, 4.66 mol%, 4.61 mol%, 3.16 mol%, 3.72 mol%, 4.21 mol%, 4.57 mol%, 5.10 mol%, 5.54 mol%, 4.72 mol%, 2.18 mol%, 2.36 mol%, 3.31 mol%, 4.63 mol%, or 6.00 mol% Zr02, or Zr02within a numerical range created by any of the above

[0133] 4.21 mol%, 4.57 mol%, 5.10 mol%, 5.54 mol%, 4.72 mol%, 2.18 mol%, 2.36 mol%, 3.31 mol%, 4.63 mol%, or 6.00 mol% Zr02, or Zr02within a numerical range created by any of the above

[0134] In the glass system of the present application, CaO is an optional component as a network-modifying oxide. An appropriate amount of CaO helps to reduce the high temperature viscosity of the glass, increase the density of the glass, facilitate the glass forming, and at the same time, strengthen the network structure, so that the stress gain in the chemical strengthening process is enhanced. However, an excessive amount of CaO will cause a sharp decrease in the crystallinity of the glass, and the intrinsic strength is affected. Therefore, the mole percentage of CaO is controlled at 0.00-5.00 mol%.

[0135] In some embodiments, the glass-ceramic can include 0.00-5.00 mol%, 0.10-4.00 mol%, 0.00-2.50 mol%, 0.50-3.80 mol%, 0.00-4.00 mol%, 0.80-2.00 mol%, 0.00-1.60 mol%, 0.00-1.00 mol%, 1.50-4.00 mol%, 0.00-2.00 mol%, 1.00-4.00 mol%, or 0.10-5.00 mol% of CaO. In some embodiments, the glass-ceramic can include 0.00, 0.10, 0.50, 0.70, 0.85, 0.95, 1.00, 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.80, 2.00, 2.50, 3.00, 4.00, 3.72, 0.94, 0.92, 0.93, 1.83, 2.67, or 5.00 mol% of CaO, or a range of CaO between any two of the foregoing specifically named values, as long as the glass-ceramic or chemically strengthened glass-ceramic of the present application has the desired properties. It is understood that any of the foregoing ranges can be combined with any other range, as long as the glass-ceramic or chemically strengthened glass-ceramic of the present application has the desired properties.

[0136] In the glass system of the present application, Li2O as an essential component is a network modifier oxide which not only provides free oxygen to improve the viscosity of the glass, promote the melting and fining of the glass melt, but also is one of the main components to form lithium disilicate crystals. In addition, Li2O can provide alkali lithium ions for ion exchange with large radius ions in the molten salt bath, which is an important factor affecting the stress level that can be achieved by the chemically strengthened glass-ceramic. However, excessive Li2O can lead to poor stability of the glass crystallization process, and even precipitate other undesirable crystal phases, which can degrade the optical performance of the glass-ceramic. Therefore, the mole percentage of Li2O is controlled in the range of 27.00-32.00 mol%, preferably 28.00-31.00 mol%.

[0137] In some embodiments, the glass-ceramic can include 27.00-32.00 mol%, 27.50-31.00 mol%, 27.00-30.00 mol%, 27.50-29.50 mol%, 28.00-31.00 mol%, 28.50-31.00 mol%, 29.00-30.50 mol%, or 29.50-32.00 mol% Li20. In some embodiments, the glass-ceramic can include 27.00, 27.50, 28.00, 28.50, 29.00, 29.50, 30.00, 30.50, 31.00, 31.50, 27.54, 28.59, 29.52, 29.08, 29.80, 29.93, 29.30, 31.51, 30.22, 29.66, 29.25, or 32.00 mol% Li20, or a range of Li20 between any two of the foregoing specifically stated values, as long as the resulting glass-ceramic or chemically strengthened glass-ceramic has the desired properties. It is understood that any of the foregoing ranges can be combined with any other range, as long as the resulting glass-ceramic or chemically strengthened glass-ceramic has the desired properties.

[0138] In the glass system of the present application, MgO is an optional component. An appropriate amount of MgO can function to adjust the composition of the glass phase in the glass-ceramic. However, an excessive amount of MgO can affect the growth of crystals and the crystalline structure of the glass-ceramic. Therefore, the molar percentage of MgO is controlled to be 0.00-2.00 mol%.

[0139] In some embodiments, the glass-ceramics can comprise 0.00-2.00 mol%, 0.00-1.60 mol%, 0.50-1.60 mol%, 0.80-1.50 mol%, 0.00-1.00 mol%, 0.00-0.50 mol%, 0.10-1.10 mol%, 0.10-1.50 mol%, or 0.00-1.40 mol% of MgO. In some embodiments, the glass-ceramics can comprise 0.00 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.34 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.80 mol%, or 2.00 mol% of MgO, or a range of MgO anywhere between any two of the foregoing specifically enumerated values, as long as the glass-ceramics or chemically strengthened glass-ceramics of the present application have the desired properties. It is understood that any of the foregoing ranges can be combined with any other range, as long as the glass-ceramics or chemically strengthened glass-ceramics of the present application have the desired properties.

[0140] In the glass system of the present application, ZnO, as a network intermediate, is an optional component. Appropriate amount of ZnO can bind free oxygen, adjust the glass structure, and can remain in the glass phase of the glass-ceramics to increase the glass viscosity, but excessive ZnO can affect the crystal growth and the crystalline structure of the glass-ceramics. Therefore, the mole percentage of ZnO is controlled in the range of 0.00-2.00 mol%.

[0141] In some embodiments, the glass-ceramic can comprise 0.00-2.00 mol%, 0.00-1.70 mol%, 0.50-1.60 mol%, 0.80-1.50 mol%, 0.00-1.00 mol%, 0.00-0.50 mol%, 0.10-1.10 mol%, 0.10-1.50 mol%, or 0.00-1.40 mol% of ZnO. In some embodiments, the glass-ceramic can comprise 0.00 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.67 mol%, 1.80 mol%, or 2.00 mol% of ZnO, or ZnO within a range between any two of the foregoing specifically enumerated values, as long as the resulting glass-ceramic or chemically strengthened glass-ceramic has the desired properties. It is understood that any of the foregoing ranges can be combined with any of the other ranges, as long as the resulting glass-ceramic or chemically strengthened glass-ceramic has the desired properties.

[0142] Na2O is an optional component in the glass system of the present application and is an network-modifying oxide. An appropriate amount of Na2O can provide free oxygen, improve the viscosity of the glass, promote melting and fining of the glass melt, and also adjust the rate of chemical strengthening. However, too much Na2O can not only reduce the crystallinity of the glass-ceramic, but also affect the chemical strengthening effect. Therefore, the molar percentage of Na2O is controlled to be 0.00-3.00 mol%.

[0143] In some embodiments, the glass-ceramic can include 0.00-3.00 mol%, 0.00-2.80 mol%, 0.00-1.00 mol%, 0.10-2.70 mol%, 0.50-1.60 mol%, 0.60-1.00 mol%, 2.50-3.00 mol%, or 0.00-0.50 mol% of Na20. In some embodiments, the glass-ceramic can include 0.00, 0.50, 0.70, 0.85, 0.95, 1.00, 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.80, 2.00, 2.50, 2.60, or 3.00 mol% of Na20, or a range of values between any two of these specifically enumerated values, as long as the resulting glass-ceramic or chemically strengthened glass-ceramic has the desired properties. It is understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the resulting glass-ceramic or chemically strengthened glass-ceramic has the desired properties.

[0144] In the glass systems of the present application, K20 is an optional component that is an interstitial oxide. Appropriate amounts of K20 can provide free oxygen to increase the SiO2 / O ratio in the glass structure, but too much K20 can disrupt the glass network, affecting the optical properties, thermal stability, chemical durability, mechanical strength, and weatherability of the glass. Therefore, the mole percent of K20 is controlled to be in the range of 0.00-1.00 mol%.

[0145] In some embodiments, the glass-ceramic can include 0.00-1.00 mol%, 0.50-1.00 mol%, 0.00-0.50 mol%, 0.85-1.00 mol%, or 0.00-0.15 mol% of K20. In some embodiments, the glass-ceramic can include 0.00, 0.15, 0.50, 0.70, 0.85, 0.92, 0.95, or 1.00 mol% of K20, or a range of values between any two of these specifically enumerated values, as long as the resulting glass-ceramic or chemically strengthened glass-ceramic has the desired properties. It is understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the resulting glass-ceramic or chemically strengthened glass-ceramic has the desired properties.

[0146] In the glass system of the present application, B2O3 is an optional component. Appropriate amount of B2O3 can be used as flux and / or softener, which helps to improve the forming and thermal bending effect of the glass. However, excessive B2O3 can cause uncontrolled crystallization process, resulting in poor optical performance of the glass-ceramics. Therefore, the molar percentage of B2O3 is controlled in the range of 0.00-1.00 mol%.

[0147] In some embodiments, the glass-ceramics can comprise 0.00-1.00 mol%, 0.00-0.50 mol%, 0.50-1.00 mol%, 0.10-0.85 mol%, 0.85-1.00 mol%, or 0.25-0.75 mol% of B2O3. In some embodiments, the glass-ceramics can comprise 0.00 mol%, 0.10 mol%, 0.25 mol%, 0.50 mol%, 0.60 mol%, 0.65 mol%, 0.70 mol%, 0.75 mol%, 0.85 mol%, 0.95 mol%, or 1.00 mol% of B2O3, or a value within a range bounded by any two of the foregoing specific values as end points, as long as the glass-ceramics or chemically strengthened glass-ceramics with desired properties of the present application can be obtained. It should be understood that any of the foregoing ranges can be combined with any other range, as long as the glass-ceramics or chemically strengthened glass-ceramics with desired properties of the present application can be obtained.

[0148] In the glass system of the present application, SrO is an optional component, which is an alkaline earth metal oxide. Appropriate amount of SrO can adjust the composition of the glass phase in the glass-ceramics, which helps to increase the density and Young's modulus of the glass-ceramics. Meanwhile, it is also beneficial to reduce the expansion softening point of the glass-ceramics, which is conducive to the thermal bending of the glass-ceramics into 3D curved glass-ceramics. However, excessive SrO can cause poor optical performance of the glass-ceramics. Therefore, the molar percentage of SrO is controlled in the range of 0.00-2.00 mol%.

[0149] In some embodiments, the glass-ceramic can include 0.00-2.00 mol%, 0.10-2.00 mol%, 0.00-1.00 mol%, 0.10-1.00 mol%, 0.30-1.90 mol%, 0.40-1.20 mol%, 1.20-2.00 mol%, 0.00-0.30 mol%, 0.85-1.40 mol%, 0.85-1.90 mol%, 0.50-1.20 mol%, or 1.00-2.00 mol% of SrO. In some embodiments, the glass-ceramic can include 0.00, 0.30, 0.46, 0.50, 0.70, 0.85, 0.92, 0.95, 1.00, 1.10, 1.20, 1.30, 1.40, 1.50, 1.60, 1.80, 1.83, or 2.00 mol% of SrO, or a range of SrO between any two of the foregoing specifically named values, as long as a glass-ceramic or chemically strengthened glass-ceramic having the desired properties of the application is obtained. It will be appreciated that any of the foregoing ranges can be combined with any other range, as long as a glass-ceramic or chemically strengthened glass-ceramic having the desired properties of the application is obtained.

[0150] In some embodiments, the glass-ceramic can include, in mole percent on an oxide basis: SiO2: 60.00-65.00 mol%, Al2O3: 0.00-2.00 mol%, P2O5: 1.50-3.00 mol%, ZrO2: 2.00-6.00 mol%, MgO: 0.00-2.00 mol%, ZnO: 0.00-2.00 mol%, Na2O: 0.00-3.00 mol%, K2O: 0.00-1.00 mol%, Li2O: 27.00-32.00 mol%, CaO: 0.00-4.00 mol%, B2O3: 0.00-1.00 mol%, SrO: 0.00-2.00 mol%. By having the glass-ceramic satisfy the foregoing composition, not only can the glass-ceramic be endowed with high intrinsic strength and excellent optical properties, but also the chemical strengthening effect can be guaranteed, ensuring that the glass-ceramic obtains a high stress level after chemical strengthening, and thus obtains high mechanical strength properties and excellent deformation resistance.

[0151] In some embodiments, the composition of the glass-ceramics described herein can further include other components in addition to the above-mentioned composition ranges. For example, in some embodiments, the composition of the glass-ceramics further includes, in terms of mole percent of oxides, Y2O3: 0.00-1.00 mol%, La2O3: 0.00-1.00 mol%, Ta2O5: 0.00-1.00 mol%.

[0152] In the glass system described herein, the appropriate amount of Y2O3, La2O3, or Ta2O5 added selectively helps to increase the density and Young's modulus of the glass-ceramics, but can also increase the refractive index of the glass-ceramics, which can decrease the optical performance of the glass-ceramics. Therefore, the mole percent of Y2O3, La2O3, or Ta2O5 is controlled to be in the range of 0.00-1.00 mol%.

[0153] In some embodiments, the mole percent of Y2O3, La2O3, or Ta2O5 in the glass-ceramics can be 0.00, 0.10, 0.20, 0.30, 0.40, 0.46, 0.50, 0.53, 0.60, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, or 1.00 mol%, or a value within a range defined by any two of the above-mentioned specific values as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics having the desired properties described herein 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 the glass-ceramics or chemically strengthened glass-ceramics having the desired properties described herein can be obtained.

[0154] In some embodiments, the composition of the glass-ceramic comprises, in mole percent on the basis of oxides: SiO2: 60.50-64.00 mol%, Al2O3: 0.00-2.00 mol%, P2O5: 1.50-2.50 mol%, ZrO2: 3.20-6.00 mol%, MgO: 0.00-2.00 mol%, ZnO: 0.00-2.00 mol%, Na2O: 0.00-1.00 mol%, K2O: 0.00-1.00 mol%, Li2O: 28.00-31.00 mol%, CaO: 0.00-2.50 mol%, B2O3: 0.00-1.00 mol%, SrO: 0.00-2.00 mol%, Y2O3: 0.00-1.00 mol%, La2O3: 0.00-1.00 mol%, Ta2O5: 0.00-1.00 mol%. By making the glass-ceramic satisfy the above composition, it is more conducive to prepare a chemically strengthened glass-ceramic with a higher stress level, and in turn, it is conducive to ensure that the prepared chemically strengthened glass-ceramic has excellent mechanical strength performance and deformation resistance.

[0155] In some embodiments of the present application, the composition of the glass-ceramic further satisfies 0.90≤ SiO2+ Li2O≤ 0.96, in terms of the content of each oxide in mole percent in the composition of the glass-ceramic. By using a composition satisfying the above relationship, it is conducive to ensure that lithium disilicate crystals with a desired content are precipitated in the glass-ceramic, and effectively reduce the precipitation of other crystals (such as petalite crystals), which is conducive to ensuring that the glass-ceramic has high intrinsic strength and optical performance, and also conducive to making the glass-ceramic have a high stress level after chemical strengthening, and further conducive to ensuring that the base glass does not lose transparency during the heat treatment for preparing the glass-ceramic, or ensuring that the base glass does not lose transparency during the melting process. In some embodiments, the value of SiO2+ Li2O may, for example, be 0.900, 0.904, 0.905, 0.910, 0.915, 0.920, 0.925, 0.930, 0.935, 0.940, 0.945, 0.950, or 0.960, or a value within a value range with any two of the above specific values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0156] In some embodiments of the present application, the composition of the glass-ceramic also satisfies: Al203 / Si02≤ 0.030, in terms of the content of each oxide in the glass-ceramic composition expressed in mole percent. By adjusting the content relationship between Al203and Si02, while stabilizing the glass network structure, it is beneficial to ensure the formation of the desired crystalline phase structure, and it is also beneficial to enable the glass-ceramic to obtain a high stress level after chemical strengthening, thereby facilitating the glass-ceramic to obtain high mechanical strength performance and excellent deformation resistance. In some embodiments, the value of Al203 / Si02may be, for example, 0, 0.005, 0.010, 0.015, 0.020, 0.025, or 0.030, or a value within a range between any two of the above specific numerical values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application can be obtained.

[0157] In some embodiments of the present application, the composition of the glass-ceramic also satisfies: 0.31≤ Zr02 / (CaO + Zr02+ Al203)≤ 1.50, preferably, 0.32≤ Zr02 / (CaO + Zr02+ Al203)≤ 1.20, more preferably, 0.36≤ Zr02 / (CaO + Zr02+ Al203)≤ 1.10, in terms of the content of each oxide in the glass-ceramic composition expressed in mole percent. By adjusting the content relationship between CaO, Zr02, and Al203, which are components that have strengthening or toughening effects on the glass structure, it is beneficial to better play the role of each component, thereby ensuring the high intrinsic strength of the glass-ceramic and the high stress level after strengthening, and thereby facilitating the glass-ceramic to obtain high mechanical strength performance and excellent deformation resistance. In some embodiments, the value of Zr02 / (CaO + Zr02+ Al203)may be, for example, 0.31, 0.32, 0.34, 0.36, 0.37, 0.33, 0.83, 0.77, 0.67, 0.69, 0.62, 0.75, 0.59, 0.79, 0.80, 1.00, 0.35, 0.66, 0.50, 0.70, 0.40, 0.60, 0.90, 1.10, 1.20, 1.30, 1.40, or 1.50, or a value within a range between any two of the above specific numerical values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application can be obtained.

[0158] In some embodiments of the present application, the composition of the glass-ceramic also satisfies: 0.10≤Zr02 / (100%-3xLi20)≤0.60, preferably, 0.12≤Zr02 / (100%-3xLi20)≤0.52, more preferably, 0.16≤Zr02 / (100%-3xLi20)≤0.50, in terms of the content of each oxide in the glass-ceramic composition in mole percent. By adjusting the content of Zr02and Li20to satisfy a specific content relationship, it is beneficial to better play the nucleation and / or toughening effect of Zr02while ensuring the glass-ceramic to form a desired crystalline phase structure and achieve excellent optical performance, so as to ensure the glass-ceramic to have high intrinsic strength, thereby facilitating the glass-ceramic to obtain high mechanical strength performance and excellent deformation resistance. In some embodiments, the value of Zr02 / (100%-3xLi20) may, for example, be 0.10, 0.12, 0.15, 0.33, 0.44, 0.40, 0.25, 0.35, 0.41, 0.37, 0.46, 0.48, 0.39, 0.13, 0.43, 0.42, 0.50, 0.52, 0.56 or 0.60, or 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 chemically strengthened glass-ceramic having 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 chemically strengthened glass-ceramic having the required performance of the present application can be obtained.

[0159] In some embodiments of the present application, the composition of the glass-ceramic also satisfies: 0.034≤ZrO2 / SiO2≤0.100, preferably, 0.035≤ZrO2 / SiO2≤0.095, and more preferably, 0.055≤ZrO2 / SiO2≤0.095, in terms of the content of each oxide in the glass-ceramic composition in terms of mole percentage. By adjusting the content of ZrO2 and SiO2 to satisfy a specific content relationship, it is beneficial to better play the toughening effect of ZrO2 while ensuring that the glass-ceramic forms a desired crystal phase structure and achieves excellent optical performance, thereby ensuring that the glass-ceramic has high intrinsic strength, and further facilitating the glass-ceramic to obtain high mechanical strength performance and excellent deformation resistance. In some embodiments, the value of ZrO2 / SiO2 may, for example, be 0.041, 0.075, 0.051, 0.060, 0.067, 0.083, 0.091, 0.035, 0.037, 0.052, 0.034, 0.100, 0.095, or 0.055, or a value within a value range formed by any two of the above specific values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0160] In some embodiments of the present application, the composition of the glass-ceramic also satisfies: CaO+Al2O3≤0.065, preferably, CaO+Al2O3≤0.055, and more preferably, CaO+Al2O3≤0.050, in terms of the content of each oxide in the glass-ceramic composition in terms of mole percentage. By controlling the total content of CaO and Al2O3 to satisfy a specific requirement, it is beneficial to avoid affecting the crystallization of the glass-ceramic while playing its strengthening effect, thereby ensuring that the glass-ceramic achieves a desired crystal phase structure, and further facilitating the glass-ceramic to obtain high mechanical strength performance and excellent deformation resistance. In some embodiments, the value of CaO+Al2O3 may, for example, be 0.000, 0.053, 0.009, 0.014, 0.023, 0.032, 0.041, 0.012, 0.024, 0.050, 0.055, or 0.065, or a value within a value range formed by any two of the above specific values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0161] In some embodiments of the present application, the composition of the glass-ceramic also satisfies: (CaO + Al2O3) / Li2O≤0.25, preferably, (CaO + Al2O3) / Li2O≤0.20, more preferably, (CaO + Al2O3) / Li2O≤0.14, in terms of the content of each oxide in the glass-ceramic composition in mole percent. By adjusting CaO, Al2O3, and Li2O to satisfy a specific content relationship, it is beneficial to ensure that the lithium disilicate crystal phase is precipitated in the glass-ceramic at a desired content while exerting the reinforcing effect of CaO and / or Al2O3, thereby ensuring that the glass-ceramic achieves a desired crystal phase structure, and further beneficial to ensure that the glass-ceramic obtains high mechanical strength performance and excellent deformation resistance. In some embodiments, the value of (CaO + Al2O3) / Li2O may, for example, be 0.00, 0.19, 0.03, 0.05, 0.08, 0.11, 0.15, 0.04, 0.14, 0.16, 0.20, or 0.25, or may 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 chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0162] In some embodiments of the present application, the composition of the glass-ceramic also satisfies: 0.12≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤6.40, preferably, 0.14≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤6.16, more preferably, 0.50≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤3.00, in terms of the content of each oxide in the glass-ceramic composition expressed in mole percent. By adjusting ZrO2, Na2O, SiO2and Li2O to satisfy a specific content relationship, it is beneficial to better play the role of each component, to make the glass-ceramic obtain high intrinsic strength and excellent optical performance, and also to make the glass-ceramic obtain high stress level and excellent deformation resistance after chemical strengthening. In some embodiments, the value of (ZrO2-Na2O) / (SiO2-2×Li2O) may be, for example, 0.12, 0.35, 0.87, 2.08, 1.72, 0.15, 1.55, 2.63, 2.73, 1.03, 0.28, 6.15, 0.86, 1.21, 6.20, 6.38, 0.14, 6.16, 0.50, 6.40 or 3.00, 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 chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0163] In some embodiments of the present application, the composition of the glass-ceramic also satisfies: Na2O / SiO2≤0.05, preferably, Na2O / SiO2≤0.04, more preferably, Na2O / SiO2≤0.02, in terms of the content of each oxide in the glass-ceramic composition expressed in mole percent. By adjusting Na2O and SiO2to satisfy a specific content relationship, it is more beneficial to make the glass-ceramic obtain high stress level and excellent deformation resistance after chemical strengthening. In some embodiments, the value of Na2O / SiO2may be, for example, 0.00, 0.01, 0.02, 0.03, 0.04 or 0.05, 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 chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0164] In some embodiments of the present application, the density ρ of the glass-ceramic is ≥2.50 g / cm3, preferably, the density ρ of the glass-ceramic is 2.50 g / cm3. 3 , preferably, the density ρ of the glass-ceramic is 2.50 g / cm3 - 2.75 g / cm 3 In some embodiments of the present application, the microcrystalline glass has a refractive index of < 1.60. Microcrystalline glass meeting this density and / or refractive index can ensure higher intrinsic strength and excellent optical performance.

[0165] In some embodiments, the microcrystalline glass has a density p of 2.50 g / cm 3、 2.54 g / cm 3 2.55 g / cm 3 2.56 g / cm 3 2.57 g / cm 3 2.58 g / cm 3 2.59 g / cm 3 2.60 g / cm 3 2.61 g / cm 3 2.62 g / cm 3 2.63 g / cm 3 2.64 g / cm 3 2.65 g / cm 3 2.70 g / cm 3 2.75 g / cm 3 , or a value falling within a range defined by any two of the above specific values as endpoints, as long as a microcrystalline glass or chemically strengthened microcrystalline glass 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 microcrystalline glass having the desired properties of the present application is obtained.

[0166] In some embodiments, the microcrystalline glass has a refractive index of 1.50, 1.51, 1.52, 1.53, 1.54, 1.55, 1.56, 1.57, 1.58, 1.59, or 1.60, or a value falling below any of the above specific values, or a value falling within a range defined by any two of the above specific values as endpoints, as long as a microcrystalline glass or chemically strengthened microcrystalline glass 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 microcrystalline glass having the desired properties of the present application is obtained.

[0167] In some embodiments of the present application, the crystallinity of the glass- ceramic is in the range of 30.00 wt% to 90.00 wt%, preferably, the crystallinity is in the range of 50.00 wt% to 90.00 wt%, more preferably, the crystallinity is in the range of 65.00 wt% to 90.00 wt%. Higher content of crystalline phase is beneficial to improve the mechanical strength performance of the glass-ceramic, while ensuring excellent optical performance of the glass-ceramic. In some embodiments, the crystallinity of the glass-ceramic can be in the range of 30.00 wt% to 90.00 wt%, 45.00 wt% to 85.00 wt%, 50.00 wt% to 90.00 wt%, 55.00 wt% to 85.00 wt%, 60.00 wt% to 85.00 wt%, 65.00 wt% to 90.00 wt%, 70.00 wt% to 90.00 wt%, or 68.00 wt% to 85.00 wt%. In some embodiments, the crystallinity of the glass-ceramic can be 30.00 wt%, 35.00 wt%, 40.00 wt%, 45.00 wt%, 50.00 wt%, 55.00 wt%, 60.00 wt%, 65.00 wt%, 70.00 wt%, 75.00 wt%, 80.00 wt%, 85.00 wt%, or 90.00 wt%, or a value within a range defined by any two of the above specifically named values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application is obtained. It should be understood that any of the above ranges can be combined with any other range, as long as a glass-ceramic with the desired properties of the present application is obtained.

[0168] In some embodiments of the present application, the "predominant crystalline phase is lithium disilicate" or "lithium disilicate crystalline phase has a higher weight percentage than other crystalline phases present in the glass-ceramic" or similar expressions mean that the lithium disilicate crystalline phase comprises greater than about 70 weight percent (wt%) of all crystalline phases of the glass-ceramic according to embodiments of the present application.

[0169] In some embodiments of the present application, non-limiting examples of other possible crystalline phases in the glass-ceramic include: petalite crystalline phase, and / or, lithium phosphate crystalline phase. In some embodiments, the glass-ceramic further comprises petalite crystalline phase, preferably, the petalite crystalline phase comprises less than or equal to 20% by weight of the glass-ceramic, more preferably, the petalite crystalline phase can comprise less than or equal to 15%, less than or equal to 10%, or less than or equal to 5% by weight of the glass-ceramic. By controlling the precipitation of other crystalline phases, it is more beneficial to ensure that lithium disilicate forms the desired interlocking structure, thereby ensuring that the glass-ceramic obtains high mechanical strength performance, excellent optical performance, and excellent deformation resistance.

[0170] In some embodiments of the present application, the average crystal size in the glass-ceramics is ≤ 100 nm, preferably, the average crystal size is ≤ 50 nm, more preferably, the average crystal size is 15-45 nm. The smaller average crystal size is advantageous to ensure the glass-ceramics has excellent optical performance. In some embodiments, the average crystal size can be 10-100 nm, 20-90 nm, 30-80 nm, 40-60 nm, 10-30 nm, 10-20 nm, 5-35 nm, 15-35 nm or 15-45 nm. In some embodiments, the average crystal size can be 5 nm, 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, 50 nm, 55 nm, 60 nm, 70 nm, 80 nm, 90 nm or 100 nm, or a value within a range defined by any two of the above specific values as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics having the desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the glass-ceramics having the desired properties of the present application can be obtained.

[0171] In some embodiments of the present application, the Young's modulus of the glass-ceramics is ≥ 100.00 GPa, preferably, the Young's modulus of the glass-ceramics is ≥ 110.00 GPa, more preferably, the Young's modulus of the glass-ceramics is 114-130 GPa. The higher Young's modulus indicates that the glass-ceramics has higher intrinsic strength, which is advantageous to obtain higher mechanical strength performance and excellent deformation resistance. In some embodiments, the Young's modulus of the glass-ceramics can be 100.00-150 GPa, 105.00-140 GPa, 110.00-130 GPa, 114-130 GPa or 114.00-125 GPa. In some embodiments, the Young's modulus of the glass-ceramics can be 100.00 GPa, 105.00 GPa, 110.00 GPa, 114.00 GPa, 115.00 GPa, 120.00 GPa, 125.00 GPa, 130.00 GPa, 140.00 GPa or 150.00 GPa, or a value within a range defined by any two of the above specific values as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics having the desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the glass-ceramics having the desired properties of the present application can be obtained.

[0172] In some embodiments of the present application, the b value of the glass-ceramic is ≤1.0, preferably ≤0.8 at a thickness of 0.5 mm. The glass-ceramic satisfying the optical b value can ensure better optical performance and display effect, and is suitable for use in display screens with requirements on display effect. In some embodiments, the b value of the glass-ceramic can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1.0, or a value less than any of the above specific values, or a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic with the required performance of the present application can be obtained.

[0173] In some embodiments of the present application, the glass-ceramic is transparent in the visible light range; the transmittance of the glass-ceramic is ≥85.00% for light with a wavelength of 550 nm at a thickness of 0.5 mm, preferably the transmittance of the glass-ceramic is ≥90.00%. The glass-ceramic satisfying the transmittance can ensure better light transmittance and transparent effect, and is suitable for use in display screens with requirements on display effect. The "visible light range" herein refers to light in the wavelength range of 360-740 nm.

[0174] In some embodiments, the transmittance of the glass-ceramic can be 85.00%, 86.00%, 87.00%, 88.00%, 89.00%, 90.00%, 90.50%, 91.00% or 92.00% for light with a wavelength of 550 nm at a thickness of 0.5 mm, or a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic with the required performance of the present application can be obtained.

[0175] The glass-ceramic of the present application has high transmittance and low b value, which indicates that the optical performance of the glass-ceramic of the present application is better and has good uniformity, and the glass-ceramic is in a transparent state, which can meet the application requirements of display screen cover glass.

[0176] In some embodiments of the present application, the crystallization upper limit temperature of the base material glass corresponding to the glass-ceramic is 1000-1100°C. Satisfying the crystallization upper limit temperature range is beneficial to realize industrial mass production.

[0177] In some embodiments of the present application, the expansion softening point of the glass-ceramic is in the range of 750-850°C, preferably, the expansion softening point of the glass-ceramic is in the range of 750-830°C. A suitable expansion softening point is advantageous for the 3D thermal bending forming of the glass-ceramic to produce a 3D curved glass-ceramic with high strength performance. In some embodiments, the expansion softening point of the glass-ceramic can be 750°C, 760°C, 770°C, 780°C, 790°C, 800°C, 810°C, 820°C, 830°C, 840°C or 850°C, or a value within a range defined by any two of the above-mentioned values as endpoints. 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 with the desired properties of the present application is obtained.

[0178] In the present application, the 3D curved glass-ceramic can be prepared from the glass-ceramic after thermal bending treatment. The 3D curved glass-ceramic has the same or substantially the same composition as the glass-ceramic, when the product composition is expressed in terms of mole percent of oxides.

[0179] The glass-ceramic of the present application can be prepared from a base glass by thermal treatment. The base glass has the same or substantially the same composition as the glass-ceramic, when the composition of the base glass is expressed in terms of mole percent of oxides.

[0180] In the present application, the base glass can be prepared by using a forming method in the prior art, and the present application does not have any limitation in this regard. For example, the forming method can include, but is not limited to, float method, overflow method, calendering or casting, etc. For example, the raw materials and fining agent can be mixed uniformly (uniformity is more than 98%), melted, formed and annealed to obtain the base glass. Further, the process parameters can include: melting temperature is 1480-1680°C, annealing temperature is 450-650°C, and the holding time at the annealing temperature is 10-48h. Further, the fining agent can include, but is not limited to, one or more of sodium chloride, tin oxide, antimony oxide or arsenic oxide, and the fining agent can be added in an amount of 0-1wt% of the total amount of the raw materials.

[0181] In the present application, when the substrate glass is heat treated to produce the glass-ceramic, the heat treatment can be performed in a crystallization furnace or an annealing furnace, and the heat treatment can include, but is not limited to, one-step heat treatment, two-step heat treatment, or multi-step heat treatment, for example, two-step heat treatment including a nucleation treatment followed by a crystallization treatment. The process conditions of the heat treatment can include, but are not limited to, a nucleation temperature of 500-700°C, a nucleation holding time of 10-1440 min, a crystallization temperature of 600-800°C, a crystallization holding time of 5-1440 min, a heating rate of 5-20°C / min, and a cooling rate of 0.1-3°C / min. After the heat treatment, one skilled in the art can further perform other conventional steps to obtain a glass-ceramic sample that meets the required specifications or requirements, for example, cutting, CNC machining (computer numerical control), polishing, or other steps.

[0182] In the present application, a chemically strengthened glass-ceramic is also provided, wherein the composition at the center of the chemically strengthened glass-ceramic is the same as that of the glass-ceramic described above, the chemically strengthened glass-ceramic comprises a compressive stress layer region extending from the surface of the chemically strengthened glass-ceramic to a depth of compression, and has a tensile stress in the interior of the chemically strengthened glass-ceramic.

[0183] It should be understood that, compared to the glass-ceramic before chemical strengthening, the composition at the surface of the glass-ceramic article after chemical strengthening can be different from the composition of the glass-ceramic before it undergoes the ion exchange process. This is because, when ion exchange is performed, in the just-formed glass-ceramic, the type of alkali metal ions (e.g., Li + or Na + ) at the surface of the glass-ceramic is replaced by larger alkali metal ions (e.g., Na + or K + ), respectively. However, in embodiments, the glass composition and phase assembly at or near the depth center of the glass-ceramic article still have the composition and phase assembly of the just-formed glass-ceramic. That is, in the present application, the composition (e.g., the composition of the tensile stress layer) and phase assembly at the center of the chemically strengthened glass-ceramic after chemical strengthening are the same as or substantially the same as those of the just-formed glass-ceramic.

[0184] In the present application, the chemically strengthened microcrystalline glass contains lithium disilicate crystal phase, wherein the lithium disilicate crystal phase has a higher weight percentage than other crystal phases present in the chemically strengthened microcrystalline glass; the composition at the center of the chemically strengthened microcrystalline glass comprises, in terms of molar percentage of oxides: SiO2: 55.00-65.00 mol%, Al2O3: 0.00-2.00 mol%, P2O5: 1.00-3.00 mol%, ZrO2: 2.00-6.00 mol%, MgO: 0.00-2.00 mol%, ZnO: 0.00-2.00 mol%, Na2O: 0.00-3.00 mol%, K2O: 0.00-1.00 mol%, Li2O: 27.00-32.00 mol%, CaO: 0.00-5.00 mol%, B2O3: 0.00-1.00 mol%, SrO: 0.00-2.00 mol%;

[0185] The composition at the center of the chemically strengthened microcrystalline glass satisfies: 2.00≤SiO2 / Li2O≤2.40, preferably, 2.00≤SiO2 / Li2O≤2.30, more preferably, 2.02≤SiO2 / Li2O≤2.20, in terms of content in terms of molar percentage of oxides.

[0186] In some embodiments of the present application, the composition at the center of the chemically strengthened microcrystalline glass further satisfies: 0.90≤SiO2+Li2O≤0.96; and / or, Al2O3 / SiO2≤0.030; and / or, 0.31≤ZrO2 / (CaO+ZrO2+Al2O3)≤1.50; and / or, 0.10≤ZrO2 / (100%-3×Li2O)≤0.60; and / or, 0.034≤ZrO2 / SiO2≤0.100; and / or, CaO+Al2O3≤0.065; and / or, (CaO+Al2O3) / Li2O≤0.25; and / or, 0.12≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤6.40; and / or, Na2O / SiO2≤0.05, in terms of content in terms of molar percentage of oxides.

[0187] In some embodiments of the present application, the composition at the center of the chemically strengthened glass-ceramics comprises, in mole percent of oxides: SiO2: 60.00-65.00 mol%, Al2O3: 0.00-2.00 mol%, P2O5: 1.50-3.00 mol%, ZrO2: 2.00-6.00 mol%, MgO: 0.00-2.00 mol%, ZnO: 0.00-2.00 mol%, Na2O: 0.00-3.00 mol%, K2O: 0.00-1.00 mol%, Li2O: 27.00-32.00 mol%, CaO: 0.00-4.00 mol%, B2O3: 0.00-1.00 mol%, SrO: 0.00-2.00 mol%.

[0188] In some embodiments of the present application, the composition at the center of the chemically strengthened glass-ceramics further comprises, in mole percent of oxides: Y2O3: 0.00-1.00 mol%, La2O3: 0.00-1.00 mol%, Ta2O5: 0.00-1.00 mol%.

[0189] In some embodiments of the present application, the composition at the center of the chemically strengthened glass-ceramics comprises, in mole percent of oxides: SiO2: 60.50-64.00 mol%, Al2O3: 0.00-2.00 mol%, P2O5: 1.50-2.50 mol%, ZrO2: 3.20-6.00 mol%, MgO: 0.00-2.00 mol%, ZnO: 0.00-2.00 mol%, Na2O: 0.00-1.00 mol%, K2O: 0.00-1.00 mol%, Li2O: 28.00-31.00 mol%, CaO: 0.00-2.50 mol%, B2O3: 0.00-1.00 mol%, SrO: 0.00-2.00 mol%, Y2O3: 0.00-1.00 mol%, La2O3: 0.00-1.00 mol%, Ta2O5: 0.00-1.00 mol%.

[0190] In some embodiments of this application, the chemically strengthened glass-ceramic has a DOL_0 of 0.18t-0.25t, where DOL_0 is the compressive stress layer depth and t is the thickness of the chemically strengthened glass-ceramic. In some embodiments, the compressive stress layer depth DOL_0 of the chemically strengthened glass-ceramic can be 0.18t-0.25t, 0.20t-0.25t, 0.21t-0.24t, 0.21t-0.25t, or 0.22t-0.25t. For example, when the thickness of the chemically strengthened glass-ceramic is 0.5 mm, the DOL_0 of the chemically strengthened glass-ceramic can be 0.100 mm, 0.105 mm, 0.110 mm, 0.112 mm, 0.113 mm, 0.114 mm, 0.115 mm, 0.116 mm, 0.117 mm, 0.118 mm, 0.119 mm, 0.120 mm, 0.121 mm, 0.122 mm, 0.123 mm, 0.124 mm, or 0.125 mm, or a value within the range defined by any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramic with the performance required by this application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the chemically strengthened glass-ceramic with the performance required by this application can be obtained. The fact that the DOL_0 of the chemically strengthened microcrystalline glass is within the above range indicates that the chemically strengthened microcrystalline glass has a high compressive stress layer depth, which is more conducive to offsetting the energy that drives crack propagation, thereby ensuring that it has excellent damage resistance and excellent deformation resistance.

[0191] In some embodiments of the present application, the chemically strengthened glass-ceramics has a |CT AV| of 85 MPa to 200 MPa, preferably a |CT AV| of 90 MPa to 200 MPa. In some embodiments, the chemically strengthened glass-ceramics has a |CT AV| of 85 MPa to 200 MPa, 90 MPa to 200 MPa, 90 MPa to 180 MPa, 100 MPa to 150 MPa, 130 MPa to 180 MPa, 85 MPa to 100 MPa, 85 MPa to 120 MPa, 90 MPa to 150 MPa, 95 MPa to 180 MPa, 100 MPa to 140 MPa, 130 MPa to 200 MPa, or 120 MPa to 140 MPa. In some embodiments, the chemically strengthened glass-ceramics has a |CT AV| of 85 MPa, 90 MPa, 100 MPa, 110 MPa, 120 MPa, 130 MPa, 140 MPa, 150 MPa, 160 MPa, 170 MPa, 180 MPa, 190 MPa, or 200 MPa, or a |CT AV| within a range defined by any two of the foregoing specific values as endpoints, as long as a chemically strengthened glass-ceramic with the desired properties of the present application is obtained. It should be understood that in specific embodiments, any of the foregoing ranges can be combined with any other range, as long as a chemically strengthened glass-ceramic with the desired properties of the present application is obtained. A |CT AV| of the chemically strengthened glass-ceramics within the foregoing ranges indicates that the chemically strengthened glass-ceramics has a high level of tensile stress, which reflects a high level of surface stress, and a high level of surface compressive stress that can offset more of the residual energy from a drop, crush, impact, or collision, thereby ensuring excellent damage resistance and excellent deformation resistance.

[0192] In some embodiments of the present application, the chemically strengthened glass-ceramics has a CT LD of 50000 MPa / mm-100000 MPa / mm, CT LD is the compressive stress linear density; preferably has a CT LD of 55000 MPa / mm-100000 MPa / mm. In some embodiments, the chemically strengthened glass-ceramics has a CT LD of 50000 MPa / mm-100000 MPa / mm, 55000 MPa / mm-95000 MPa / mm, 60000 MPa / mm-90000 MPa / mm, 65000 MPa / mm-85000 MPa / mm, 70000 MPa / mm-80000 MPa / mm, 65000 MPa / mm-100000 MPa / mm, 60000 MPa / mm-80000 MPa / mm or 60000 MPa / mm-100000 MPa / mm. In some embodiments, the chemically strengthened glass-ceramics has a CT LD of 50000 MPa / mm, 55000 MPa / mm, 60000 MPa / mm, 65000 MPa / mm, 70000 MPa / mm, 75000 MPa / mm, 80000 MPa / mm, 85000 MPa / mm, 90000 MPa / mm, 95000 MPa / mm or 100000 MPa / mm, or a CT LD within a range defined by any two of the above-mentioned specific values as endpoints, as long as the chemically strengthened glass-ceramics with the required 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 the chemically strengthened glass-ceramics with the required properties of the present application can be obtained. The range of CT LD of the chemically strengthened glass-ceramics within the above-mentioned range indicates that the compressive stress stored inside the chemically strengthened glass-ceramics is more intensive, which indicates that the chemically strengthened glass-ceramics has a higher surface stress level, thereby ensuring that it has excellent damage resistance and excellent deformation resistance.

[0193] In some embodiments of the present application, the chemically strengthened glass-ceramics has a |CT_CV| of 120 MPa to 320 MPa, preferably, the chemically strengthened glass-ceramics has a |CT_CV| of 135 MPa to 300 MPa, more preferably, the chemically strengthened glass-ceramics has a |CT_CV| of 160 MPa to 300 MPa. |CT_CV| refers to the absolute value of the maximum tensile stress. In some embodiments, the chemically strengthened glass-ceramics has a |CT_CV| of 120 MPa to 320 MPa, 135 MPa to 300 MPa, 160 MPa to 300 MPa, 170 MPa to 285 MPa, 180 MPa to 270 MPa, 120 MPa to 250 MPa, or 165 MPa to 290 MPa. In some embodiments, the chemically strengthened glass-ceramics has a |CT_CV| of 120 MPa, 135 MPa, 150 MPa, 160 MPa, 170 MPa, 180 MPa, 190 MPa, 200 MPa, 210 MPa, 220 MPa, 230 MPa, 240 MPa, 250 MPa, 260 MPa, 270 MPa, 280 MPa, 290 MPa, or 300 MPa, or a |CT_CV| within a range defined by any two of the foregoing specific values as endpoints, as long as a chemically strengthened glass-ceramic with the desired properties of the present application is obtained. It should be understood that in specific embodiments, any of the foregoing ranges can be combined with any other range, as long as a chemically strengthened glass-ceramic with the desired properties of the present application is obtained. A chemically strengthened glass-ceramic having a |CT_CV| within the foregoing ranges indicates that the chemically strengthened glass-ceramic has a high level of tensile stress, which reflects a high level of surface compressive stress, and a high level of surface compressive stress can offset more of the residual energy from a drop, crush, impact, or collision, thereby ensuring excellent damage resistance and excellent deformation resistance.

[0194] In some embodiments of the present application, the chemically strengthened glass-ceramics has a Vickers hardness of greater than or equal to 680 kgf / mm 2 , preferably, the chemically strengthened glass-ceramics has a Vickers hardness of 700 kgf / mm 2 to 800 kgf / mm 2 . In some embodiments, the chemically strengthened glass-ceramics has a Vickers hardness of 680 kgf / mm 2 , 700 kgf / mm 2 , 710 kgf / mm 2 , 720 kgf / mm 2 , 730 kgf / mm 2 , 740 kgf / mm 2 , 750 kgf / mm 2760kgf / mm 2 770kgf / mm 2 780kgf / mm 2 790kgf / mm 2 Or 800 kgf / mm 2 The Vickers hardness, or the Vickers hardness within the range defined by any two of the above specific values ​​as endpoints, is acceptable as long as it yields the chemically strengthened glass-ceramic with the properties 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 the chemically strengthened glass-ceramic with the properties required by this application is obtained. The fact that the Vickers hardness of the chemically strengthened glass-ceramic falls within the above range indicates that the chemically strengthened glass-ceramic has high hardness, thereby ensuring its excellent mechanical properties.

[0195] In this application, those skilled in the art can select the thickness of the microcrystalline glass or chemically strengthened microcrystalline glass according to their needs. For example, the thickness of the microcrystalline glass or chemically strengthened microcrystalline glass can be 0.2mm-5mm, 0.2mm-2.0mm, 0.2mm-0.8mm, 0.4mm-0.6mm, or 0.2mm-0.7mm, etc.

[0196] In this application, by making the chemically strengthened microcrystalline glass meet specific composition and stress characteristics, it is possible to ensure that the chemically strengthened microcrystalline glass has excellent mechanical strength properties, excellent damage resistance properties, and excellent deformation resistance.

[0197] In some embodiments of the present application, the deformation of the stress position of the chemically strengthened microcrystalline glass to the stress direction is ≤0.850 mm when the center of the main surface of the chemically strengthened microcrystalline glass is pressed under a load of 10 kgf using a 10 mm diameter round head metal press rod at a thickness of 0.5 mm. The smaller the deformation of the chemically strengthened microcrystalline glass after being pressed, the more excellent its anti-deformation ability is. When it is used as a cover glass of a display screen, the smaller the deformation after being pressed or impacted, the smaller the probability of contacting the inner screen of the glass is, which is beneficial to improve the problem of the failure of the inner screen of the glass caused by the impact of the cover glass. In some embodiments, the deformation of the stress position of the chemically strengthened microcrystalline glass to the stress direction can be 0.806 mm, 0.804 mm, 0.787 mm, 0.828 mm, 0.798 mm, 0.827 mm, 0.814 mm, 0.758 mm, 0.805 mm, 0.779 mm, 0.816 mm, 0.788 mm, 0.823 mm, 0.796 mm, 0.782 mm, 0.764 mm or 0.850 mm, or a value less than any of the specific values mentioned above, or a value within a range formed by any two of the specific values mentioned above as endpoints, when the center of the main surface of the chemically strengthened microcrystalline glass is pressed under a load of 10 kgf at a thickness of 0.5 mm.

[0198] In some embodiments of the present application, the chemical strengthened microcrystalline glass can withstand a load of ≥ 30 N at the center of the main surface of the chemical strengthened microcrystalline glass when the center of the main surface of the chemical strengthened microcrystalline glass is deformed by 0.400 mm along the direction of force using a 10 mm diameter round head metal press rod at a thickness of 0.5 mm. The greater the load that the chemical strengthened microcrystalline glass can withstand when a certain amount of deformation occurs, the greater the load that can be offset by the deformation of the chemical strengthened microcrystalline glass when the chemical strengthened microcrystalline glass is subjected to a press or impact, and thus the smaller the press or impact load that the inner glass screen is subjected to when the deformation of the chemical strengthened microcrystalline glass contacts the inner glass screen, and the lower the possibility of failure of the inner glass screen. Using a chemical strengthened microcrystalline glass that can withstand or offset a greater load as a cover glass is beneficial to improving the problem of failure of the inner glass screen caused by the impact or press of the cover glass. In some embodiments, the chemical strengthened microcrystalline glass can withstand a load of 36.9 N, 38.6 N, 38.5 N, 33.8 N, 37.2 N, 34.9 N, 37.4 N, 39.2 N, 38.1 N, 37.6 N, 38.7 N, 37.8 N, 38.4 N, 39.4 N, or 40.0 N, or a value greater than any of the above specific values, or a value within a range defined by any two of the above specific values as endpoints, at the center of the main surface of the chemical strengthened microcrystalline glass when the center of the main surface of the chemical strengthened microcrystalline glass is deformed by 0.400 mm along the direction of force using a 10 mm diameter round head metal press rod at a thickness of 0.5 mm.

[0199] The chemical strengthened microcrystalline glass of the present application can be obtained by chemically strengthening the microcrystalline glass as described above. The chemical strengthening process can be carried out according to the processes in the prior art, for example, but not limited to: first heating a molten salt containing a certain concentration of sodium ions to the required temperature for chemical strengthening, then preheating the microcrystalline glass (for example, the preheating can be carried out at a heating rate of 5 ℃ / min-100 ℃ / min) to the required chemical strengthening temperature, then placing the microcrystalline glass in the molten salt, and then constant temperature treatment for the required time to achieve chemical strengthening, then taking out, cooling to room temperature, then washing the surface to remove the salt, and then drying to obtain a chemical strengthened microcrystalline glass with high stress level and excellent deformation resistance.

[0200] In some embodiments of the present application, the temperature of the molten salt bath used for the chemical strengthening process can be 380 ℃-550 ℃, and the time for the chemical strengthening process can be 0.5 h-24 h.

[0201] In some embodiments of the present application, the components of the molten salt include 5wt%-50wt% of sodium salt, 50-95wt% of potassium salt and 0.01-0.30wt% of lithium salt, in terms of mass ratio, and further, the sodium salt, potassium salt and lithium salt can each independently be nitrate, sulfate, phosphate or carbonate, etc. In some embodiments, the cooling rate of the chemically strengthened glass-ceramics after the chemical strengthening treatment is completed can be 1°C / min-50°C / min.

[0202] In the present application, the chemically strengthened glass-ceramics prepared from the aforementioned glass-ceramics with high strength and transparency has excellent anti-deformation ability and excellent anti-drop damage performance. When the chemically strengthened glass-ceramics is used as the cover glass of electronic devices, it not only ensures that the cover glass of electronic devices is difficult to break, but also effectively avoids the inner screen from being broken or damaged due to the impact of the cover glass under extrusion or impact, and ensures better protection of the inner screen.

[0203] The transparent glass-ceramics or chemically strengthened glass-ceramics with excellent mechanical strength performance and excellent anti-deformation ability provided by the present application can be used in electronic devices, including but not limited to mobile phones, tablet computers, handheld game consoles, portable digital devices (such as digital cameras), vehicle control centers, electronic whiteboard glass, smart home, and can also be used in vehicles, aircraft or vessels, and can also be used in any required glass-ceramic glass device. For example, it can be used in the display screen, cover glass, touch screen, glass inner screen or inner frame of electronic devices; for example, it can be used in the windshield of vehicles, aircraft or vessels, such as 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.

[0204] The following detailed description of the embodiments of the present application is exemplary and is only used to explain the present application, and cannot be understood as a limitation of the present application.

[0205] In the example number of the following table: S refers to the example, such as S1 refers to Example 1; D refers to the comparative example, such as D1 refers to Comparative Example 1.

[0206] Example 1

[0207] (1) Preparation of the base glass:

[0208] The raw materials (the raw materials are configured according to the formula of S1 in Table 1, and the oxide ratios are as shown in Table 2) with a total mass of 1000 g are prepared, 5 g of sodium chloride is added to the prepared raw materials, and the mixture is mixed in a V-type mixer at a rotating speed of 25 r / min for 30 min, and then is melted in a platinum-gold crucible at 1650 ℃ for 5 h, and then is poured into a mold to form a glass brick, and after being cooled to 900 ℃, the glass brick is placed in an annealing furnace at 460 ℃ for annealing for 12 h, and then is slowly cooled to room temperature in the furnace, so that a substrate glass brick is obtained.

[0209] (2) Preparation of the glass-ceramic: the substrate glass brick is placed in a crystallization furnace, and is heated from room temperature to 525 ℃ at a heating rate of 10 ℃ / min for nucleation treatment, and then is heated to 685 ℃ at a heating rate of 10 ℃ / min for crystallization treatment after being kept at 525 ℃ for 240 min, and then is cooled to room temperature at a cooling rate of 1 ℃ / min, so that a glass-ceramic sample brick is obtained. The composition of the prepared glass-ceramic is the same as that of the substrate glass, and is shown in Tables 1-2 in terms of mole percentage of oxides.

[0210] After the obtained glass-ceramic sample brick is sequentially subjected to cutting, CNC processing (the CNC instrument used in the present application is of the RCG500S type), and polishing, a glass-ceramic sample meeting the required specifications and requirements can be prepared. In the present application, the glass-ceramic sample brick is subjected to the foregoing cold processing to prepare a glass-ceramic sample with a thickness of 0.50 mm, specifically a glass-ceramic polished sheet sample with a size of 50 mm×50 mm×0.5 mm.

[0211] The obtained glass-ceramic of S1 is tested as follows:

[0212] The main crystal phase, the crystallinity, the average crystal size, the dilatometric softening point, the density, the refractive index, the Young's modulus of the glass-ceramic, and the optical b value and the transmittance (under light with a wavelength of 550 nm) of the glass-ceramic sample with a thickness of 0.5 mm are tested, respectively, and the results are shown in Table 3.

[0213] (3) Preparation of the chemically strengthened glass-ceramic: the obtained glass-ceramic sample is preheated in a strengthening furnace cavity for 5 min, and then is quickly placed in a molten salt at 450 ℃ for chemical strengthening. The composition of the molten salt is 29.99wt% NaNO3+69.98wt% KNO3+0.03wt% LiNO3. After chemical strengthening for 21.0 h, the glass sample is taken out and slowly cooled to room temperature on the furnace body, and then the salt on the surface of the glass sample is washed off with clean water. After drying treatment of the glass sample, a chemically strengthened glass-ceramic is obtained.

[0214] The obtained chemically strengthened glass-ceramic of S1 is tested as follows:

[0215] I. The chemical strengthened glass-ceramics were measured by SLP 2000 (Japan Luceo) stress meter (the light source wavelength used is 518 nm, SOC = 25.5 (nm / cm) / MPa, the refractive index is set according to the refractive index value of the glass-ceramic sample, the refractive index of the glass-ceramic sample in S1 is 1.5600, and the exposure time is 300 μsec) to determine |CT_CV|, DOL_0, |CT_AV|, and then calculate the tensile stress linear density (CT_LD) value, and the results are shown in Table 4.

[0216] II. The Vickers hardness of the chemical strengthened glass-ceramics was tested, and the results are shown in Table 4.

[0217] III. The deformation resistance of the chemical strengthened glass-ceramics was tested, such as the deformation amount of the chemical strengthened glass-ceramics under a 10 kgf load, and the load borne by the chemical strengthened glass-ceramics when the deformation amount is 0.40 mm, and the results are shown in Table 4.

[0218] Examples 2-18

[0219] 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 1-4.

[0220] The DSC curve of the substrate glass of Example 3 is shown in Figure 1 , and the heat treatment process used for preparing the glass-ceramics from the substrate glass can be determined with reference to the figure.

[0221] The XRD pattern of the glass-ceramics of Example 3 is shown in Figure 2 , and it can be known from the figure that the main crystal phase in the glass-ceramics is lithium disilicate crystal phase.

[0222] The transmittance curve of the glass-ceramics of Example 3 is shown in Figure 3 , and it can be known from the figure that the glass-ceramics is transparent in the visible light range and has high transmittance.

[0223] The load deformation curve of the chemical strengthened glass-ceramics of Example 3 is shown in Figure 4 , and it can be known from the figure that the deformation amount of the chemical strengthened glass-ceramics under different loads, and the load borne by the chemical strengthened glass-ceramics when different deformation amounts occur.

[0224] Comparative Examples 1-8

[0225] 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 5-8.

[0226] The load deformation curve of the chemical strengthened glass-ceramics of Comparative Example 3 is shown inFigure 5 As shown.

[0227] Crystallization upper limit temperature test: In order to analyze the industrialization production capacity of the microcrystalline glass of the present application, the crystallization upper limit temperature of the substrate glass of some examples was tested, wherein the crystallization upper limit temperature of the substrate glass of S3 was 1067.2°C, and the crystallization upper limit temperature of the substrate glass of S4 was 1053.5°C, both of which were lower than 1100°C, and the crystallization upper limit temperature was between 1000°C-1100°C, indicating that the microcrystalline glass of the present application was beneficial to industrialization batch production.

[0228] Expansion softening point test: In order to analyze the 3D hot bending effect of the microcrystalline glass of the present application, the expansion softening point of the microcrystalline glass in some examples was tested, as shown in Table 3. From the test results, the expansion softening point of the microcrystalline glass of the present application was lower than 830°C, and was between 750°C-850°C, indicating that the microcrystalline glass of the present application was beneficial to 3D hot bending forming to prepare 3D curved microcrystalline glass.

[0229]

[0230]

[0231]

[0232]

[0233]

[0234] From the results of the examples of Tables 1-4 and the comparative examples of Tables 5-8, it can be seen that, compared with the comparative examples, the microcrystalline glass prepared by the example scheme of the present application not only meets the oxide content range, but also meets the specific oxide content relationship, has excellent optical performance and high Young's modulus, and lithium disilicate crystal phase is the main crystal phase of the microcrystalline glass. Moreover, the chemical strengthened microcrystalline glass prepared by the microcrystalline glass of the example of the present application can obtain high stress level and high mechanical strength performance, and the deformation resistance is obviously better than that of the comparative examples. In addition, the crystallization upper limit temperature of the substrate glass corresponding to the microcrystalline glass of the example of the present application is low, indicating that it is suitable for industrialization batch production. At the same time, the expansion softening point temperature of the microcrystalline glass of the example of the present application is appropriate, indicating that it is suitable for 3D hot bending forming into 3D curved microcrystalline glass.

[0235] In the schemes of Comparative Example 1-Comparative Example 8, the glass formula does not meet the oxide content range and the specific oxide content relationship of the present application at the same time, and the microcrystalline glass prepared thereby has poor optical performance or cannot prepare chemical strengthened microcrystalline glass with good deformation resistance.

[0236] Comparison Figure 4 andFigure 5 It can be seen that the chemical strengthening microcrystalline glass of Example 3 of the present application has a significantly greater load to be borne or offset at the center of the main surface when the deformation amount of 0.40 mm occurs in the extrusion than Comparative Example 3, and it can be seen that the chemical strengthening microcrystalline glass of the present application has a more excellent deformation resistance.

[0237] The above describes the preferred embodiments of the present application, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be considered as disclosed by the present application and fall within the protection scope of the present application.

Claims

1. A chemically strengthened microcrystalline glass characterized in that, The chemical strengthening microcrystalline glass comprises lithium disilicate crystal phase, wherein the lithium disilicate crystal phase has a higher weight percentage than other crystal phases present in the chemical strengthening microcrystalline glass; has a tensile stress layer in the interior of the chemical strengthening microcrystalline glass, and the composition at the center of the chemical strengthening microcrystalline glass or the tensile stress layer comprises, in terms of mole percentage of oxides: SiO2: 58.00-63.39 mol%, Al2O3: 0.00-2.00 mol%, P2O5: 1.50-3.00 mol%, ZrO2: 3.00-6.00 mol%, MgO: 0.00-2.00 mol%, ZnO: 0.00-2.00 mol%, Na2O: 0.00-2.00 mol%, K2O: 0.00-1.00 mol%, Li2O: 27.00-32.00 mol%, CaO: 0.00-5.00 mol%, B2O3: 0.00-1.00 mol%, SrO: 0.00-2.00 mol%; The composition at the center of the chemical strengthening microcrystalline glass or the tensile stress layer satisfies: 2.07≤SiO2 / Li2O≤2.40, 0.25<ZrO2 / (100%-3×Li2O)≤0.50, 0.50≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤6.20, 0.060≤ZrO2 / SiO2≤0.100, in terms of mole percentage of oxides.

2. The chemically strengthened glass-ceramic according to claim 1, wherein The composition at the center of the chemical strengthening microcrystalline glass or the tensile stress layer also satisfies, in terms of content of each oxide in mole percentage in the composition at the center of the chemical strengthening microcrystalline glass or the tensile stress layer: 0.90≤SiO2+Li2O≤0.96, preferably 0.90≤SiO2+Li2O≤0.95; and / or, Al2O3 / SiO2≤0.

030.

3. The chemically strengthened glass-ceramics according to claim 1 or 2, characterized in that, The composition at the center of the chemical strengthening microcrystalline glass or the tensile stress layer also satisfies, in terms of content of each oxide in mole percentage in the composition at the center of the chemical strengthening microcrystalline glass or the tensile stress layer: 0.31≤ZrO2 / (CaO+ZrO2+Al2O3)≤1.50, preferably 0.32≤ZrO2 / (CaO+ZrO2+Al2O3)≤1.20, more preferably 0.36≤ZrO2 / (CaO+ZrO2+Al2O3)≤1.10; and / or, 0.25<ZrO2 / (100%-3×Li2O)≤0.48; and / or, 0.060≤ZrO2 / SiO2≤0.095, preferably 0.067≤ZrO2 / SiO2≤0.095; and / or, 2.07≤SiO2 / Li2O≤2.30, preferably 2.07≤SiO2 / Li2O≤2.

25.

4. The chemically strengthened glass ceramic according to any one of claims 1-3, wherein, In terms of the content of each oxide in the composition of the center or the tensile stress layer of the chemically strengthened glass-ceramics, the composition of the center or the tensile stress layer of the chemically strengthened glass-ceramics also satisfies: CaO + Al2O3≤ 0.065, preferably CaO + Al2O3≤ 0.055, more preferably CaO + Al2O3≤ 0.050; and / or, (CaO + Al2O3) / Li2O≤ 0.25, preferably (CaO + Al2O3) / Li2O≤ 0.20, more preferably (CaO + Al2O3) / Li2O≤ 0.

14.

5. The chemically strengthened glass ceramic according to any one of claims 1-4, wherein, In terms of the content of each oxide in the composition of the center or the tensile stress layer of the chemically strengthened glass-ceramics, the composition of the center or the tensile stress layer of the chemically strengthened glass-ceramics also satisfies: 0.50≤ (ZrO2- Na2O) / (SiO2- 2 x Li2O) ≤ 6.16, more preferably 0.50≤ (ZrO2- Na2O) / (SiO2- 2 x Li2O) ≤ 3.00; and / or, Na2O / SiO2≤ 0.05, preferably Na2O / SiO2≤ 0.04, more preferably Na2O / SiO2≤ 0.

02.

6. The chemically strengthened glass ceramic according to any one of claims 1-5, wherein, In terms of the content of each oxide in the composition of the center or the tensile stress layer of the chemically strengthened glass-ceramics, the composition of the center or the tensile stress layer of the chemically strengthened glass-ceramics also satisfies: The content of SiO2is 60.00-63.39 mol%, preferably the content of SiO2is 60.50-63.00 mol%; and / or, The content of Li2O is 28.00-31.00 mol%, preferably the content of Li2O is 29.00-30.50 mol%; and / or, The content of ZrO2is 3.20-6.00 mol%, preferably the content of ZrO2is 4.00-6.00 mol%; and / or, The content of P2O5is 1.50-2.50 mol%; and / or, The content of Na2O is 0.00-1.00 mol%, preferably the content of Na2O is 0.00-0.50 mol%; and / or, The content of CaO is 0.00-4.00 mol%, preferably the content of CaO is 0.00-2.50 mol%.

7. The chemically strengthened glass ceramic according to any one of claims 1-6, wherein, In terms of the content of each oxide in the composition of the center or the tensile stress layer of the chemically strengthened glass-ceramics, the composition of the center or the tensile stress layer of the chemically strengthened glass-ceramics also satisfies: SiO2in an amount of 58.00 mol%, 59.00 mol%, 60.00 mol%, 61.00 mol%, 62.00 mol%, 63.00 mol%, 62.55 mol%, 62.58 mol%, 61.82 mol%, 61.72 mol%, 61.87 mol%, 61.76 mol%, 62.59 mol%, 61.15 mol%, 61.25 mol%, 61.06 mol%, 63.17 mol%, 62.77 mol%, 63.39 mol%, 63.17 mol%, 63.16 mol%, or 62.01 mol%; and / or, Al2O3in an amount of 0.00 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.80 mol%, 1.55 mol%, 1.38 mol%, 1.41 mol%, 1.37 mol%, 1.39 mol%, 1.43 mol%, 1.23 mol%, 1.42 mol%, or 2.00 mol%; and / or, Li2O in an amount of 27.00 mol%, 27.50 mol%, 28.00 mol%, 28.50 mol%, 29.00 mol%, 29.50 mol%, 30.00 mol%, 30.50 mol%, 31.00 mol%, 31.50 mol%, 27.54 mol%, 28.59 mol%, 29.52 mol%, 29.08 mol%, 29.80% mol%, 29.93 mol%, 29.30 mol%, 31.51 mol%, 30.22 mol%, 29.66 mol%, 29.25 mol%, or 32.00 mol%; and / or, ZrO2in an amount of 3.00 mol%, 3.10 mol%, 3.30 mol%, 3.50 mol%, 4.00 mol%, 4.50 mol%, 5.00 mol%, 5.50 mol%, 5.80 mol%, 2.58 mol%, 4.68 mol%, 4.66 mol%, 4.61 mol%, 3.16 mol%, 3.72 mol%, 4.21 mol%, 4.57 mol%, 5.10 mol%, 5.54 mol%, 4.72 mol%, 2.18 mol%, 2.36 mol%, 3.31 mol%, 4.63 mol%, or 6.00 mol%; and / or, P2O5 in an amount of 1.50 mol%, 1.70 mol%, 1.75 mol%, 1.80 mol%, 1.85 mol%, 1.95 mol%, 2.00 mol%, 2.10 mol%, 2.20 mol%, 2.30 mol%, 2.40 mol%, 2.50 mol%, 2.60 mol%, 2.80 mol%, 2.06 mol%, 1.87 mol%, 1.88 mol%, 1.86 mol%, 1.83 mol%, 1.89 mol%, 1.74 mol%, 1.51 mol%, or 3.00 mol%; and / or, Na2O in an amount of 0.00 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.80 mol%, or 2.00 mol%; and / or, CaO in an amount of 0.00 mol%, 0.10 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.80 mol%, 2.00 mol%, 2.50 mol%, 3.00 mol%, 4.00 mol%, 3.72 mol%, 0.94 mol%, 0.92 mol%, 0.93 mol%, 1.83 mol%, 2.67 mol%, or 5.00 mol%.

8. The chemically strengthened glass ceramic according to any one of claims 1-7, wherein, The composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer satisfies, in terms of the amount of each oxide in mole percent: SiO2 / Li2O has a value of 2.07, 2.08, 2.09, 2.10, 2.11, 2.12, 2.13, 2.14, 2.15, 2.16, 2.17, 2.18, 2.19, 2.20, 2.25, 2.30, or 2.40, and / or, (ZrO2-Na2O) / (SiO2-2xLi2O) has a value of 0.87, 2.08, 1.72, 1.55, 2.63, 2.73, 1.03, 6.15, 0.86, 1.21, 6.20, 6.16, 0.50, or 3.00; and / or, ZrO2 / (100%-3xLi2O) has a value of 0.25, 0.35, 0.41, 0.37, 0.46, 0.48, 0.39, 0.13, 0.43, 0.42, 0.50, 0.52, 0.56, or 0.60; and / or, ZrO2 / SiO2 has a value of 0.075, 0.060, 0.067, 0.083, 0.091, 0.100, or 0.

095.

9. The chemically strengthened glass ceramic according to any one of claims 1-8, wherein, The composition at the center of the chemically strengthened glass-ceramics or the tensile stress layer further comprises, in terms of mole percentage of oxides: Y2O3: 0.00-1.00 mol%, La2O3: 0.00-1.00 mol%, Ta2O5: 0.00-1.00 mol%.

10. The chemically strengthened glass ceramic according to any one of claims 1-9, wherein, The composition at the center of the chemically strengthened glass-ceramics or the tensile stress layer satisfies: the sum of the contents of Na2O and K2O is less than 1.00 mol% in terms of mole percentage of oxides.

11. The chemically strengthened glass ceramic according to any one of claims 1-10, wherein, The crystallinity of the chemically strengthened glass-ceramics is 30.00-90.00 wt%, preferably, the crystallinity is 50.00-90.00 wt%, and the crystallinity is 65.00-90.00 wt%. And / or, The average crystal size in the chemically strengthened glass-ceramics is ≤100 nm, preferably, the average crystal size is ≤50 nm, and more preferably, the average crystal size is 15-45 nm.

12. The chemically strengthened glass ceramic according to any one of claims 1-11, wherein, The Young's modulus of the chemically strengthened glass-ceramics is ≥100.00 GPa, preferably, the Young's modulus of the chemically strengthened glass-ceramics is ≥110.00 GPa, and more preferably, the Young's modulus of the chemically strengthened glass-ceramics is 114-130 GPa.

13. The chemically strengthened glass ceramic according to any one of claims 1-12, wherein, The b value of the chemically strengthened glass-ceramics is ≤1.0, preferably, the b value is ≤0.8 at a thickness of 0.5 mm; and / or, The chemically strengthened glass-ceramics is transparent in the visible light range, and the transmittance of the chemically strengthened glass-ceramics is ≥85.00% for light with a wavelength of 550 nm at a thickness of 0.5 mm, preferably, the transmittance of the chemically strengthened glass-ceramics is ≥90.00%.

14. The chemically strengthened glass ceramic of any of claims 1-13, wherein, The lithium disilicate crystal phase accounts for more than 70 wt% of all crystal phases of the chemically strengthened glass-ceramics.

15. The chemically strengthened glass ceramic of any of claims 1-14, wherein, The chemically strengthened glass-ceramics comprises a compressive stress layer region extending from the surface of the chemically strengthened glass-ceramics to a compressive depth, the chemically strengthened glass-ceramics has a DOL_0 of 0.18t-0.25t, preferably, the chemically strengthened glass-ceramics has a DOL_0 of 0.20t-0.25t, the DOL_0 is the compressive stress layer depth, and t is the thickness of the chemically strengthened glass-ceramics.

16. The chemically strengthened glass ceramic of any of claims 1-15, wherein, The chemically strengthened glass-ceramics has a |CT_AV| of 85-200 MPa, preferably, the chemically strengthened glass-ceramics has a |CT_AV| of 90-200 MPa, and more preferably, the chemically strengthened glass-ceramics has a |CT_AV| of 130-200 MPa, the |CT_AV| is the absolute value of the average tensile stress.

17. The chemically strengthened glass ceramic of any of claims 1-16, wherein, The chemically strengthened glass-ceramics has a CT_LD of 64439-100000 MPa / mm, and more preferably, the chemically strengthened glass-ceramics has a CT_LD of 65000-100000 MPa / mm, the CT_LD is the tensile stress line density.

18. The chemically strengthened glass ceramic of any of claims 1-17, wherein, The chemically strengthened glass-ceramics has |CT_CV| of 120 MPa-320 MPa, preferably, the chemically strengthened glass-ceramics has |CT_CV| of 135 MPa-300 MPa, more preferably, the chemically strengthened glass-ceramics has |CT_CV| of 160 MPa-300 MPa.

19. The chemically strengthened glass ceramic of any of claims 1-18, wherein, The chemically strengthened glass-ceramic has a Vickers hardness greater than or equal to 680 kgf / mm 2 , preferably the chemically strengthened glass-ceramic has a Vickers hardness of 700 kgf / mm 2 - 800 kgf / mm 2 .

20. The chemically strengthened glass ceramic of any of claims 1-19, wherein, The chemically strengthened glass-ceramics has a deformation of ≤0.850 mm at the position of the main surface center of the chemically strengthened glass-ceramics under a load of 10 kgf when the main surface center of the chemically strengthened glass-ceramics is pressed by a 10 mm diameter round head metal press rod at a thickness of 0.5 mm; and / or, The chemically strengthened glass-ceramics has a load of ≥30 N at the main surface center of the chemically strengthened glass-ceramics when a deformation of 0.400 mm occurs along the direction of the force at the main surface center of the chemically strengthened glass-ceramics under a load of 10 kgf when the main surface center of the chemically strengthened glass-ceramics is pressed by a 10 mm diameter round head metal press rod at a thickness of 0.5 mm.

21. A glass article, characterized by, The glass device comprises the chemically strengthened glass-ceramics according to any one of claims 1-20.

22. An electronic device, comprising: The electronic device comprises the chemically strengthened glass-ceramics according to any one of claims 1-20.

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