Glass ceramic, chemically strengthened glass ceramic and uses thereof

Abstract

NOT VISIBLE DUE TO STATUS OF PATENT

Description

Glass-ceramics, chemically strengthened glass-ceramics and applications thereof

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number 202410156362.3 filed with the China Patent Office on February 2, 2024, entitled “A kind of microcrystalline glass, chemically strengthened microcrystalline glass and its application”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application belongs to the field of microcrystalline glass technology, and specifically relates to a microcrystalline glass with excellent deformation resistance, chemically strengthened microcrystalline glass and their applications. Background Art

[0004] With the advent of the smart age, portable electronic devices such as mobile phones, tablets, and watches have become an indispensable part of daily life, and most of the damage they suffer is due to screen shattering. With the introduction of microcrystalline glass such as "Kunlun Glass", "Super Ceramic Crystal", and "Titan Glass", the probability of cover glass shattering has been greatly reduced. However, the problem of glass inner screen failure needs to be further improved. If the inner screen fails, it is easy to cause touch failure, display abnormalities, screen damage, etc. In particular, driven by the market demand for larger screens and thinner electronic devices, the thickness of cover glass is getting thinner and thinner. When the cover glass is squeezed or impacted and deformed, it will squeeze the glass inner screen, which may cause the inner screen to fail. Therefore, in order to better improve the problem of glass inner screen failure caused by impact on the cover glass, it is urgent to develop cover glass with excellent deformation resistance. Summary of the Invention

[0005] Glass-ceramics, a solid material containing both microcrystalline and glassy phases, possess significant strength advantages over conventional glass due to its numerous nanocrystals, which can inhibit the growth of microcracks. Among glass-ceramics, those with a primary lithium disilicate crystalline phase have great potential for use as cover glass in electronic products.

[0006] The lithium disilicate (Li2Si2O5) crystalline phase is an orthorhombic crystal based on an array of [Si2O5] tetrahedrons, with a flat or plate-like shape. Within glass-ceramics, the lithium disilicate crystals form a randomly oriented, interlocking microstructure, forcing cracks through the crystals to distort their path, thereby preventing crack propagation and improving the strength and fracture toughness of the glass-ceramics. Furthermore, the refractive index of lithium disilicate crystals is close to that of the glass matrix (e.g., the base glass used to prepare glass-ceramics), making it an ideal crystalline phase for preparing highly transparent glass-ceramics.

[0007] In view of this, the purpose of this application is to provide a microcrystalline glass with high strength and excellent optical properties, with lithium disilicate as the main crystalline phase. The microcrystalline glass can be prepared by chemical strengthening to obtain chemically strengthened microcrystalline glass with high stress level, excellent deformation resistance and high mechanical strength.

[0008] In order to achieve the above objectives, this application provides the following technical solutions:

[0009] The present application provides a glass-ceramic, wherein the glass-ceramic contains a lithium disilicate crystalline phase, wherein the lithium disilicate crystalline phase has a higher weight percentage than other crystalline phases present in the glass-ceramic;

[0010] In terms of molar percentage of oxides, the composition of glass-ceramics includes:

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

[0012] The composition of the glass-ceramics, expressed as a molar percentage of each oxide in the glass-ceramics composition, satisfies the following conditions: 2.00≤SiO2 / Li2O≤2.40, optionally, 2.00≤SiO2 / Li2O≤2.30, and further optionally, 2.02≤SiO2 / Li2O≤2.20. By optimizing the glass formula, such as using a higher content of zirconium and a lower content of aluminum at a higher content of lithium, and ensuring that the various components satisfy a specific content relationship and interact with each other, it is beneficial to ensure the precipitation of a desired content of lithium disilicate crystalline phase and limit the precipitation of other crystalline phases (such as petalite crystalline phase), thereby helping to ensure that a glass-ceramics with high intrinsic strength and excellent optical properties and with lithium disilicate as the main crystalline phase is obtained. On the other hand, it is beneficial to ensure that the glass-ceramics meet specific composition and structure, thereby ensuring that after chemical strengthening, a chemically strengthened glass-ceramics with high stress levels and excellent deformation resistance is obtained.

[0013] In some embodiments of the present application, the composition of the glass-ceramics further satisfies the following requirements, based on the content of each oxide in the glass-ceramics expressed as a molar percentage:

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

[0015] Al2O3 / SiO2≤0.030. By adjusting the components to meet a specific content relationship, it is beneficial to ensure the formation of the desired crystalline phase structure and to increase the stress level generated by the micro-ceramic after chemical strengthening, thereby ensuring that the micro-ceramic obtains high mechanical strength and excellent deformation resistance.

[0016] In some embodiments of the present application, the composition of the glass-ceramics further satisfies the following requirements, based on the content of each oxide in the glass-ceramics expressed as a molar percentage:

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

[0018] and / or,

[0019] 0.10≤ZrO2 / (100%-3×Li2O)≤0.60, optionally, 0.12≤ZrO2 / (100%-3×Li2O)≤0.52, further optionally, 0.16≤ZrO2 / (100%-3×Li2O)≤0.50;

[0020] and / or,

[0021] 0.034≤ZrO2 / SiO2≤0.100, optionally, 0.035≤ZrO2 / SiO2≤0.095, and further optionally, 0.055≤ZrO2 / SiO2≤0.095. By adjusting the components to meet specific content relationships, the reinforcing or toughening effects of each component are maximized, and the interaction between the components is utilized, thereby ensuring the high intrinsic strength of the microcrystalline glass and the high stress level after strengthening, thereby ensuring that the microcrystalline glass obtains high mechanical strength and excellent deformation resistance.

[0022] In some embodiments of the present application, the composition of the glass-ceramics further satisfies the following requirements, based on the content of each oxide in the glass-ceramics expressed as a molar percentage:

[0023] CaO+Al2O3≤0.065, optionally, CaO+Al2O3≤0.055, further optionally, CaO+Al2O3≤0.050;

[0024] and / or,

[0025] (CaO + Al2O3) / Li2O≤0.25, optionally, (CaO + Al2O3) / Li2O≤0.20, and further optionally, (CaO + Al2O3) / Li2O≤0.14. By adjusting the components to meet specific content relationships, the reinforcing effects of each component are maximized while avoiding affecting the crystallization of the glass-ceramics, thereby ensuring that the glass-ceramics achieves the desired crystalline phase structure, thereby ensuring that the glass-ceramics obtains high mechanical strength and excellent deformation resistance.

[0026] In some embodiments of the present application, the composition of the glass-ceramics further satisfies the following requirements, based on the content of each oxide in the glass-ceramics expressed as a molar percentage:

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

[0028] and / or,

[0029] Na2O / SiO2≤0.05, optionally, Na2O / SiO2≤0.04, and further optionally, Na2O / SiO2≤0.02. Adjusting the components to meet specific content relationships helps to better utilize the components, enabling the glass-ceramics to achieve high intrinsic strength and excellent optical properties, and also helps the glass-ceramics achieve high stress levels and excellent deformation resistance after chemical strengthening.

[0030] In some embodiments of the present application, in terms of molar percentage of oxides, in the glass-ceramics:

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

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

[0033] The content of ZrO2 is 3.20mol%-6.00mol%, further, the content of ZrO2 can be 4.00mol%-6.00mol%; and / or,

[0034] The content of P2O5 is 1.50mol%-3.00mol%, further, the content of P2O5 can be 1.50mol%-2.50mol%; and / or,

[0035] The content of Na2O is 0.00mol%-1.00mol%, further, the content of Na2O can be 0.00mol%-0.50mol%; and / or,

[0036] The content of CaO is 0.00 mol% to 4.00 mol%, and further, the content of CaO can be 0.00 mol% to 2.50 mol%. By adjusting the composition of the glass-ceramics, the glass-ceramics can obtain high mechanical strength and excellent deformation resistance.

[0037] In some embodiments of the present application, the glass-ceramics further comprises, by mole percentage of oxides, the following: Y2O3: 0.00 mol%-1.00 mol%, La2O3: 0.00 mol%-1.00 mol%, and Ta2O5: 0.00 mol%-1.00 mol%. The selective addition of appropriate amounts of Y2O3, La2O3, or Ta2O5 helps increase the density and Young's modulus of the glass-ceramics, but may also increase the refractive index of the glass-ceramics, thereby reducing the optical properties of the glass-ceramics.

[0038] In some embodiments of the present application, the sum of the molar percentages of Na2O and K2O in the glass-ceramics is less than 1.00 mol%, calculated as a molar percentage of oxides.

[0039] In some embodiments of the present application, the density of the glass-ceramics is ρ≥2.50 g / cm 3 Optionally, the density of the glass-ceramic is 2.50 g / cm 3 ~2.75g / cm 3 and / or the refractive index of the glass-ceramics is ≤1.60. Glass-ceramics meeting these density and / or refractive index requirements can ensure high intrinsic strength and excellent optical properties.

[0040] In some embodiments of the present application, the crystallinity of the glass-ceramics is 30.00 wt%-90.00 wt%, optionally, the crystallinity is 50.00 wt%-90.00 wt%, or the crystallinity is 65.00 wt%-90.00 wt%;

[0041] and / or,

[0042] In the glass-ceramics, the average crystal size is ≤100nm, optionally ≤50nm, and further optionally, the average crystal size is between 15nm and 45nm. A higher content of crystalline phases improves the mechanical strength of the glass-ceramics, while a smaller average crystal size helps ensure the glass-ceramics have excellent optical properties.

[0043] In some embodiments of the present application, the Young's modulus of the glass-ceramic is ≥100.00 GPa. Optionally, the Young's modulus of the glass-ceramic is ≥110.00 GPa. Further optionally, the Young's modulus of the glass-ceramic is between 114 GPa and 130 GPa. A higher Young's modulus indicates that the glass-ceramic has higher intrinsic strength, which is beneficial for achieving higher mechanical strength and excellent deformation resistance.

[0044] In some embodiments of the present application, when the glass-ceramics is 0.5 mm thick, the b value of the glass-ceramics is ≤1.0, and optionally, the b value may be ≤0.8; and / or,

[0045] Glass-ceramics are transparent in the visible light range. When the glass-ceramics is 0.5mm thick, its transmittance for light at a wavelength of 550nm is ≥85.00%, and optionally, ≥90.00%. Glass-ceramics that meet these optical b-values ​​and / or transmittances ensure superior optical performance and display quality, making them suitable for display screens with demanding visual effects.

[0046] In some embodiments of the present application, the expansion softening point of the glass-ceramics is 750° C. to 850° C., and optionally, the expansion softening point of the glass-ceramics is 750° C. to 830° C. A suitable expansion softening point facilitates 3D hot bending of the glass-ceramics to produce 3D curved glass-ceramics with high strength.

[0047] The present application also provides a chemically strengthened microcrystalline glass, wherein the composition at the center of the chemically strengthened microcrystalline glass is the same as the composition of the aforementioned microcrystalline glass, the chemically strengthened microcrystalline glass includes a compressive stress layer region extending from the surface of the chemically strengthened microcrystalline glass to the compression depth, and has tensile stress inside the chemically strengthened microcrystalline glass.

[0048] In some embodiments of the present application, the chemically strengthened glass-ceramics includes a 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-ceramics; the composition at the center of the chemically strengthened glass-ceramics, in terms of molar percentage of oxides, includes: SiO2: 55.00mol%-65.00mol%, Al2O3: 0.00mol%-2.00mol%, P2O5: 1.00mol%-3.00mol%, ZrO2: 2.00mol%-6.0 0mol%, MgO: 0.00mol%-2.00mol%, ZnO: 0.00mol%-2.00mol%, Na2O: 0.00mol%-3.00mol%, K2O: 0.00mol%-1.00mol %, Li2O: 27.00mol%-32.00mol%, CaO: 0.00mol%-5.00mol%, B2O3: 0.00mol%-1.00mol%, SrO: 0.00mol%-2.00mol%;

[0049] The composition at the center of the chemically strengthened microcrystalline glass satisfies, in terms of content expressed in molar percentage of oxides: 2.00≤SiO2 / Li2O≤2.40, optionally, 2.00≤SiO2 / Li2O≤2.30, and further optionally, 2.02≤SiO2 / Li2O≤2.20.

[0050] In some embodiments of the present application, the composition at the center of the chemically strengthened glass-ceramics further satisfies the following, calculated in terms of the content expressed as a molar percentage 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%-3×Li2O)≤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] In some embodiments of the present application, the composition at the center of the chemically strengthened glass-ceramics includes, in terms of mole percentage of oxides:

[0061] The content of SiO2 is 60.00mol%-65.00mol%, further, the content of SiO2 can be 60.50mol%-64.00mol%; and / or, the content of Li2O is 28.00mol%-31.00mol%, further, the content of Li2O can be 29.00mol%~30.50mol%; and / or, the content of ZrO2 is 3.20mol%-6.00mol%, further, the content of ZrO2 can be 4.00mol%~6.00mol%. 1%; and / or, the content of P2O5 is 1.50mol%-3.00mol%, further, the content of P2O5 can be 1.50mol%-2.50mol%; and / or, the content of Na2O is 0.00mol%-1.00mol%, further, the content of Na2O can be 0.00mol%-0.50mol%; and / or, the content of CaO is 0.00mol%-4.00mol%, further, the content of CaO can be 0.00mol%-2.50mol%.

[0062] In some embodiments of the present application, the composition at the center of the chemically strengthened glass-ceramics further includes, in terms of molar percentage of oxides: Y2O3: 0.00mol%-1.00mol%, La2O3: 0.00mol%-1.00mol%, Ta2O5: 0.00mol%-1.00mol%.

[0063] In some embodiments of the present application, the chemically strengthened glass-ceramics has a DOL_0 of 0.18t-0.25t. Alternatively, the chemically strengthened glass-ceramics has a DOL_0 of 0.20t-0.25t, where DOL_0 represents the depth of the compressive stress layer and t represents the thickness of the chemically strengthened glass-ceramics. The DOL_0 of the chemically strengthened glass-ceramics being within the above range indicates that the chemically strengthened glass-ceramics has a high depth of the compressive stress layer, which is more conducive to offsetting the energy driving crack propagation, thereby ensuring excellent damage resistance and excellent deformation resistance.

[0064] In some embodiments of the present application, the chemically strengthened glass-ceramics has a |CT_AV| of 85 MPa-200 MPa. Optionally, the chemically strengthened glass-ceramics has a |CT_AV| of 90 MPa-200 MPa. Further optionally, the chemically strengthened glass-ceramics has a |CT_AV| of 130 MPa-200 MPa, where |CT_AV| is the absolute value of the average tensile stress. The chemically strengthened glass-ceramics having a |CT_AV| within the above range indicates that the chemically strengthened glass-ceramics has a higher tensile stress level, reflecting a higher surface stress level. A higher surface compressive stress level can offset more residual energy from a drop collision, thereby ensuring excellent damage resistance and deformation resistance.

[0065] In some embodiments of the present application, the chemically strengthened glass-ceramics has a CT_LD of 50,000 MPa / mm-100,000 MPa / mm. Alternatively, the chemically strengthened glass-ceramics has a CT_LD of 55,000 MPa / mm-100,000 MPa / mm. Further optionally, the chemically strengthened glass-ceramics has a CT_LD of 65,000 MPa / mm-100,000 MPa / mm, where CT_LD is the tensile stress linear density. The CT_LD of the chemically strengthened glass-ceramics being within the above range indicates that the tensile stress stored in the chemically strengthened glass-ceramics is relatively dense, indicating that the chemically strengthened glass-ceramics has a high surface stress level, thereby ensuring that it has excellent damage resistance and excellent deformation resistance.

[0066] In some embodiments of the present application, the chemically strengthened glass-ceramics has a |CT_CV| of 120 MPa to 320 MPa. Alternatively, the chemically strengthened glass-ceramics has a |CT_CV| of 135 MPa to 300 MPa. Further, optionally, the chemically strengthened glass-ceramics has a |CT_CV| of 160 MPa to 300 MPa. The chemically strengthened glass-ceramics having a |CT_CV| within the above range indicates that the chemically strengthened glass-ceramics has a higher tensile stress level, reflecting a higher surface stress level. A higher surface compressive stress level can offset more residual energy from a drop collision, thereby ensuring excellent damage resistance and deformation resistance.

[0067] In some embodiments of the present application, the Vickers hardness of the chemically strengthened glass-ceramics is greater than or equal to 680 kgf / mm 2 Optionally, the chemically strengthened glass-ceramics has a Vickers hardness of 700 kgf / mm 2 ~800kgf / mm 2 The Vickers hardness of the chemically strengthened glass-ceramics is within the above range, indicating that the chemically strengthened glass-ceramics has high hardness, thereby ensuring that it has excellent mechanical properties.

[0068] In some embodiments of the present application, when the chemically strengthened glass-ceramic is 0.5 mm thick, a 10 mm diameter round-headed metal pressure rod is used to compress the center of the main surface of the chemically strengthened glass-ceramic. When the center of the main surface of the chemically strengthened glass-ceramic is subjected to a 10 kgf load, the deformation of the chemically strengthened glass-ceramic at the stress-bearing location in the direction of the stress is ≤ 0.850 mm. The smaller the deformation of the chemically strengthened glass-ceramic after being squeezed, the better its deformation resistance. When used as cover glass for display screens, the smaller the deformation after being squeezed or impacted, the lower the probability of contact with the inner glass screen, which helps to alleviate the problem of inner glass screen failure caused by impact on the cover glass.

[0069] In some embodiments of the present application, when the chemically strengthened glass-ceramic is 0.5 mm thick, a 10 mm diameter round-headed metal pressure rod is used to squeeze the center of the main surface of the chemically strengthened glass-ceramic. When the center of the main surface of the chemically strengthened glass-ceramic undergoes a deformation of 0.400 mm along the direction of force, the load borne by the center of the main surface of the chemically strengthened glass-ceramic is ≥ 30 N. When a certain amount of deformation occurs, the greater the load that the chemically strengthened glass-ceramic can withstand, the greater the load that can be offset by its deformation when the chemically strengthened glass-ceramic is subjected to compression or impact. Therefore, when its deformation contacts the inner glass screen, the compression or impact load on the inner glass screen will be smaller, and the possibility of failure of the inner glass screen will be reduced. Using chemically strengthened glass-ceramic that can withstand or offset large loads as cover glass is beneficial to improving the problem of inner glass screen failure caused by impact or compression of the cover glass.

[0070] The present application provides a glass device, wherein the glass device comprises the aforementioned glass-ceramics or the aforementioned chemically strengthened glass-ceramics.

[0071] The present application also provides an electronic device, wherein the electronic device includes the aforementioned microcrystalline glass or includes the aforementioned chemically strengthened microcrystalline glass. Beneficial effects:

[0072] In this application, by ensuring that the glass-ceramic containing lithium disilicate as the main crystalline phase meets specific composition and structure, especially meeting specific oxide content and specific oxide content relationships, not only is the glass-ceramic ensured to have high intrinsic strength and excellent optical properties, but also the glass-ceramic can be prepared through chemical strengthening to obtain chemically strengthened glass-ceramic with high stress levels (e.g., high CT_LD, |CT_AV|, DOL_0, etc.) and excellent deformation resistance. Chemically strengthened glass-ceramic made from the glass-ceramic of this application, as the cover glass of electronic device displays, can better overcome the problem in the prior art that the glass inner screen is easily failed due to deformation and extrusion of the cover glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0074] FIG1 is a DSC graph of the substrate glass of Example 3.

[0075] FIG2 is the XRD pattern of the glass-ceramics of Example 3.

[0076] FIG3 is a transmittance curve diagram of the glass-ceramics of Example 3.

[0077] FIG4 is a load-deformation curve diagram of the chemically strengthened glass-ceramics of Example 3. FIG.

[0078] FIG5 is a load-deformation curve diagram of the chemically strengthened glass-ceramics of Comparative Example 3. DETAILED DESCRIPTION

[0079] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article. Among them, the terms "optional", "optionally", and "optionally" all mean that they may or may not be included (or may or may not be included).

[0080] Glossary and test methods:

[0081] Base glass: glass that has not been nucleated, crystallized or strengthened, or also called basic glass.

[0082] Glass-ceramics: also known as glass ceramics, is a type of solid composite material that contains both a glass phase and a crystal phase (also called a microcrystalline phase or a crystalline phase) and is prepared by targeted and controlled crystallization of the base glass.

[0083] Chemically strengthened glass-ceramics refers to the solid composite material obtained by chemically strengthening glass-ceramics. During high-temperature chemical strengthening, alkali metal ions with larger ionic radii (such as potassium or sodium ions) in the molten salt bath replace alkali metal ions with smaller ionic radii (such as sodium or lithium ions) in the glass-ceramics. This creates a volume difference between the exchanged ions and produces compressive stress (also known as compression stress) on the surface of the glass-ceramics.

[0084] Main crystalline phase or major crystalline phase: refers to a crystalline phase having a higher weight content than other crystalline phases present in the microcrystalline glass.

[0085] Main surface: refers to the surface with the largest surface area in the glass brick or glass sheet, such as the upper or lower surface of the cover glass.

[0086] Crystallinity: refers to the percentage of the total mass of the crystalline phase or crystals in the microcrystalline glass to the mass of the microcrystalline glass, or also called the total crystalline phase content in the microcrystalline glass.

[0087] Refractive index: The refractive index refers to the ratio of the speed of light in a vacuum to the speed of light in the medium.

[0088] Transmittance: When light of a certain wavelength hits the glass surface, the light will be reflected, absorbed and transmitted. The ratio of the intensity of the transmitted part to the intensity of the incident light is the transmittance.

[0089] SOC: Photoelastic coefficient. Photoelasticity refers to the anisotropic birefringence of transparent materials when subjected to stress. By measuring the photoelastic coefficient and birefringence, the residual stress (in MPa) within the material can be determined.

[0090] CT_LD: refers to the tensile stress linear density, measured in MPa / mm. It should be understood that after the glass-ceramics is placed in a molten salt bath for ion exchange, a compressive stress layer (or also called a compressive stress layer) will be formed on the surface of the glass-ceramics, and a tensile stress layer (or also called a tensile stress layer) will be formed inside the glass-ceramics. Exemplarily, during chemical strengthening, alkali metal ions with a large radius in the molten salt bath are ion-exchanged with alkali metal ions with a small radius in the glass-ceramics, thereby forming a compressive stress layer on the surface of the glass-ceramics and a tensile stress layer inside the glass-ceramics. In this application, CT_LD is calculated by the following formula:

[0091] Where t is the thickness of the chemically strengthened glass-ceramic, in mm; DOL_0 is the depth of the compressive stress layer of the chemically strengthened glass-ceramic, in μm; and |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 calculation formula for tensile stress linear density is based on the aforementioned unit requirements, and the units are not involved in the calculation.

[0092] |CT_CV|: refers to the absolute value of the maximum tensile stress, in MPa. Specifically, it refers to the absolute value of the maximum tensile stress in the tensile stress layer, obtained by testing with the SLP-2000 stress meter.

[0093] |CT_AV|: refers to the absolute value of the average tensile stress, in MPa. Specifically, it refers to the absolute value of the average value of all tensile stresses in the tensile stress layer, obtained by testing with the SLP-2000 stress meter.

[0094] DOL_0: refers to the depth of the compressive stress layer, or the depth of the compressive stress layer. Specifically, it refers to the distance from any major surface of the chemically strengthened microcrystalline glass to the position close to that surface where the compressive stress is zero. It is measured using an SLP-2000 stress meter.

[0095] b value: used to characterize the yellow-blue value of a material. The optical b value in this application refers to the b value of transmitted light. A positive optical b value indicates that the material is blue.

[0096] Vickers hardness: Vickers hardness refers to a standard for expressing the hardness of materials proposed by Robert L. Smith and George E. Sandland of the United Kingdom at Vickers Ltd in 1921.

[0097] Crystallization upper limit temperature: Crystallization upper limit temperature refers to the highest temperature at which the substrate glass produces crystallization. Above this temperature, the substrate glass will not precipitate crystals.

[0098] Glass thickness: measured with a micrometer. It should be understood that the degree of ion exchange varies gradually from the surface to the center of the glass through the thickness, and the overall Na-K and / or Li-Na exchange increment (mass) generally does not exceed 1.5% of the total sample mass. Therefore, the expansion effect through the thickness is extremely slight, and the thickness can be considered essentially unchanged. In other words, the change in thickness of the glass-ceramic before and after chemical strengthening is very small and negligible.

[0099] Glass sheet size measurement: A two-dimensional measuring machine (instrument model: Miyu MY-YXCL-4030) was used for testing.

[0100] XRD testing: The glass-ceramics or chemically strengthened glass-ceramics of this application were crushed and ground into samples with a particle size of less than 75 μm. The ground samples were tested using an X-ray diffractometer to obtain XRD diffraction peak curves and XRD diffraction data. The X-ray diffractometer used in this application was a Shimadzu XRD-6100, with a 2θ value of 10°-60°, a scanning speed of 0.2° / min, an operating voltage of 40 kV, and an operating current of 30 mA.

[0101] Determination of crystal phase: XRD diffraction data were analyzed using Jade software (JADE Standard 8.6) to determine the crystal phase composition of the sample.

[0102] Determination of Crystallinity: Import the XRD test results (RAW format) into Jade, an X-ray diffraction data Rietveld refinement software, for fitting and calculation to determine the crystallinity of the sample. Specifically, the ratio of the fitted crystalline phase peak area to the total fitted peak area is recorded as the crystallinity of the sample.

[0103] Determination of average crystal size: Using the result data obtained from the XRD test, the average crystal size of the sample can be calculated according to the Scherrer formula D = Kλ / (βcosθ). Wherein, λ is the X-ray wavelength, λ = 0.154056nm, β is the half-maximum 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. Jade outputs a fitting report. Based on the angle 2θ value and Peak FWHM value corresponding to each diffraction peak in the fitting report, the Peak FWHM value is converted to radians: β = (FWHM / 180×3.14). The crystal size of each diffraction peak is calculated using the Scherrer formula D = Kλ / (βcosθ) and then averaged to obtain the average crystal size in the sample.

[0104] Transmittance and optical b-value testing: Referring to the national standard "GB / T 7962.12-2010 Test methods for colorless optical glass Part 12: Spectral transmittance," a haze meter was used to test the transmittance and optical b-value of the glass-ceramics of this application. Specifically, a haze meter was used to test the transmittance and optical b-value of five glass-ceramics from the same batch for light of different wavelengths. The average optical b-value measured for the five glass-ceramics was taken as the optical b-value result of the glass-ceramics. The average transmittance measured for the five glass-ceramics at a wavelength of 550nm was taken as the transmittance result of the glass-ceramics at a wavelength of 550nm. Among them, the haze meter used in the test of this application is the Konica Minolta spectrophotometer CM-3600A from Japan. The light receiving optical system is transmission, the spectroscopic method is a plane reflective grating, the wavelength range is 360nm-740nm, the wavelength spacing is 10nm, the illumination light source is a pulsed xenon lamp × 4, the ambient temperature of the instrument is 24°C, and the air humidity is 40%.

[0105] Density: This application uses the electronic density balance SD-200L of Japan ALFA MIRAGE to test the density of microcrystalline glass.

[0106] Refractive index: This application uses a WYA-2WAJ Abbe refractometer to measure the refractive index of microcrystalline glass.

[0107] Expansion softening point temperature: The sample is made into a cylinder with a diameter of 5.5 mm and a length of 20 mm. The sample is tested using a thermal expansion instrument LINSEIS L75VD1000. The test output is a thermal expansion coefficient test curve. When the curve begins to decline with increasing temperature, the temperature corresponding to the starting point of the downward trend is taken as the expansion softening point temperature of the sample.

[0108] Young's modulus: The UMS-100 ultrasonic material characterization system was used to test the Young's modulus of glass-ceramics using sound waves.

[0109] Crystallization Upper Limit Temperature: Break the base glass into small pieces and place them into a long quartz tank, filling the tank completely. Set a temperature range in a JKZC-XJY01 gradient furnace, such as 1050°C-1225°C. Measure at least six temperature points in each temperature range, from high to low. Once the gradient furnace reaches the preset temperature range, place the long quartz tank containing the sample into the gradient furnace, adjusting the six temperature points to correspond to the glass samples at six locations within the long quartz tank. Maintain the long quartz tank at a constant temperature within the gradient furnace for 60-70 minutes before removing it. Observe the glass samples at different locations within the long quartz tank using a microscope or magnifying glass. If the glass sample exhibits devitrification or fogging, it is considered crystallized. If the glass sample is transparent, it is considered non-crystallized. The crystallization upper limit temperature range is between the temperature point corresponding to the transparent sample and the adjacent temperature point corresponding to the devitrified or foggy sample. The average of these two temperature points is recorded as the crystallization upper limit temperature. If all or none of the glass samples in the long quartz tank crystallize within the temperature range set by the gradient furnace, the temperature range of the gradient furnace is reset and the upper limit temperature of crystallization of the glass samples is measured.

[0110] Vickers hardness test: Chemically strengthened microcrystalline glass is made into small pieces with a length, width and thickness of 50mm×50mm×0.5mm, and glass samples with a clean surface and no visible scratches, pits, cracks and other damage are selected as test samples, and then the Vickers hardness is measured using a Vickers hardness tester. The Vickers hardness tester used in the test of this application is a digital display small load Vickers hardness tester with model VTD405 produced by Beijing Kewei Technology Co., Ltd. Test conditions: load 300gf, load time 10s, and the effectiveness of the indentation complies with the "GB / T 37900-2019 Ultra-thin glass hardness and fracture toughness test method small load Vickers hardness indentation method" standard. Select 3 different positions on the surface of the same test sample for measurement, and take the average of the 3 measurement results, which is recorded as the Vickers hardness result of the test sample.

[0111] Synchronous thermal analysis test: After the substrate glass is crushed, ground and sieved through a 200-mesh sieve to obtain a sample, approximately 20 mg of the sample is weighed and heated from room temperature to 1100°C at a heating rate of 10°C / min using a differential thermal analyzer under a nitrogen atmosphere to obtain a DSC test curve of the sample. The differential thermal analyzer used in this application is a Mettler-Toledo TGA / DSC3+ thermogravimetric and synchronous thermal analyzer. The standard used in the test is α-Al2O3 powder. The sample container is a platinum crucible. The instrument is placed in an ambient temperature of 24°C and the air humidity is ≤40%.

[0112] Stress Testing: In this application, an SLP 2000 stress meter was used to measure |CT_CV|, DOL_0, and |CT_AV| of chemically strengthened glass-ceramics. The stress meter parameters were set as follows: a light source wavelength of 518 nm, a SOC (photoelastic coefficient) of 25.5, a refractive index adjusted to the sample's refractive index, and an exposure time of 300 μsec. The tensile stress linear density (CT_LD) of the chemically strengthened glass-ceramics was then calculated using the aforementioned tensile stress linear density formula.

[0113] Deformation test: The test is conducted using the single-unit strength test method. Specifically, the chemically strengthened glass-ceramic is placed on the bottom ring of a tensile testing machine (LT_850A). The rounded end of the pressure rod contacts the center of the main surface of the chemically strengthened glass-ceramic. The pressure rod movement speed is set to 50 mm / min. The test software is launched and the test is started. The software records the applied load and the corresponding deformation curve. The deformation of the chemically strengthened glass-ceramic is read when the load is 10 kgf. The deformation here refers to the displacement of the stress point on the main surface of the chemically strengthened glass-ceramic in the direction of the force. The pressure rod used in this test method is a 10 mm diameter metal pressure rod with a rounded end that is a 10 mm diameter hemisphere.

[0114] Test of the load borne when a certain amount of deformation occurs: The "load borne" here refers to the load that needs to be applied at the force point position in order for the main surface of the chemically strengthened microcrystalline glass to undergo the corresponding deformation amount along the force direction.

[0115] The test method for "load borne" is the same as the test method for deformation, and is tested using the single-body strength test method. Specifically, the chemically strengthened microcrystalline glass is placed on the bottom ring of the tensile testing machine (LT_850A), so that the round head of the pressure rod contacts the center of the main surface of the chemically strengthened microcrystalline glass. The pressure rod movement speed is set to 50mm / min, the test software is started, and the test is started. The curve of the applied load and the corresponding deformation is recorded through the test software. The load required to be applied when the deformation of the chemically strengthened microcrystalline glass sample is 0.40mm is read and recorded as the "load borne" (or the load offset during deformation) at the center of the main surface of the chemically strengthened microcrystalline glass when the deformation is 0.40mm. The pressure rod used in this test method is a metal pressure rod with a diameter of 10mm, and the round head of the pressure rod is a hemisphere with a diameter of 10mm.

[0116] Without being bound by any theory, it's speculated that the process of glass deformation is actually a process of offsetting stress. When the cover glass deforms under force, the greater the offset stress, the less force will be transmitted to the inner glass screen under the same impact. In other words, the pressure on the inner glass screen will be reduced, and the more likely it is to fail. Similarly, when the cover glass is subjected to a certain force, the smaller the deformation, the less likely it is to squeeze the inner glass screen, and thus the less likely it is to fail.

[0117] In view of this, the present application provides a glass-ceramic having high mechanical strength, excellent optical properties, and excellent deformation resistance, wherein the main crystalline phase is lithium disilicate, a chemically strengthened glass-ceramic, and applications thereof. The glass-ceramic provided in the present application can be chemically strengthened to obtain a chemically strengthened glass-ceramic with a high stress level after chemical strengthening.

[0118] As described above, in some embodiments of the present application, a glass-ceramic is provided, wherein the glass-ceramic contains a lithium disilicate crystalline phase, wherein the lithium disilicate crystalline phase has a higher weight percentage than other crystalline phases present in the glass-ceramic; and the composition of the glass-ceramic, measured in molar percentage of oxides, includes:

[0119] SiO2: 55.00mol%-65.00mol%, Al2O3: 0.00mol%-2.00mol%, P2O5: 1.00mol%-3.00mol%, ZrO2: 2.00mol%-6.00mol%, MgO: 0.00mol%-2.00mol%, ZnO: 0.00mol%-2.00mol% , Na2O: 0.00mol%-3.00mol%, K2O: 0.00mol%-1.00mol%, Li2O: 27.00mol%-32.00mol%, CaO: 0.00mol%-5.00mol%, B2O3: 0.00mol%-1.00mol%, SrO: 0.00mol%-2.00mol%;

[0120] The composition of the glass-ceramics satisfies the following conditions: 2.00≤SiO2 / Li2O≤2.40, expressed as the molar percentage of each oxide in the glass-ceramics.

[0121] In the present application, by optimizing the glass formula, such as using a higher content of zirconium and a lower content of aluminum at a higher content of lithium, and so on, while ensuring that the various components satisfy a specific content relationship and that the various components interact with each other, on the one hand, it is beneficial to ensure the precipitation of the desired content of lithium disilicate crystal phase and limit the precipitation of other crystal phases (such as petalite crystal phase), thereby helping to ensure that microcrystalline glass with high intrinsic strength and excellent optical properties and with lithium disilicate as the main crystal phase is obtained; on the other hand, it is beneficial to ensure that the microcrystalline glass meets a specific composition and structure, thereby ensuring that after chemical strengthening, chemically strengthened microcrystalline glass with a high stress level and excellent deformation resistance is prepared.

[0122] In some embodiments, calculated as a molar percentage of oxides, the value of SiO2 / Li2O in the glass-ceramics can be, for example, 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 can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. Adopting a composition that satisfies this relationship is beneficial to reducing the crystal size in the microcrystalline glass and improving the optical properties of the microcrystalline glass; at the same time, it is beneficial to ensure the precipitation of the main crystalline phase lithium disilicate crystals and can effectively reduce the precipitation of other crystalline phases (such as petalite crystals), which is beneficial to ensuring that the microcrystalline glass obtains higher intrinsic strength and is also beneficial for the microcrystalline glass to obtain a high stress level after chemical strengthening.

[0123] In the present application, SiO2 is a forming oxide of the glass network and is an indispensable component of the glass network structure. At the same time, SiO2 is also indispensable as an important component of the lithium disilicate (Li2Si2O5) crystalline phase. Properly increasing the content of SiO2 can increase the structural stability and mechanical strength of the glass, while ensuring the precipitation of the desired content of lithium disilicate crystalline phase. However, excessive SiO2 will increase the viscosity of the substrate glass, making the glass melting more difficult, thereby reducing the formability of the substrate glass. Therefore, in order to ensure better forming and crystallization effects, the molar percentage of SiO2 is controlled at 55.00mol%-65.00mol%, optionally, the molar percentage of SiO2 is 60.00mol%-65.00mol%.

[0124] In some embodiments, the glass ceramics may contain 55.00mol%-65.00mol%, 58.00mol%-64.00mol%, 60.00mol%-65.00mol%, 61.00mol%-64.00mol%, 60.50mol%-64.00mol%, 61.50mol%-63.50mol%, 62.00mol%-64.00mol%, 63.00mol%-64.00mol% or 63.00mol%-65.00mol% SiO2. In some embodiments, the glass-ceramics may include 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%, 62.59mol%, 61.15mol%, 61.25mol%, 61.06mol%, 63.17mol%, 62.77mol%, 63.39mol%, 63.17mol%, 63.16mol%, 62.01mol% or 65.00mol% SiO2, or may contain SiO2 within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the microcrystalline or chemically strengthened microcrystalline glass-ceramics having the desired properties of the present application can be obtained. It should be understood that, in a specific embodiment, any of the above ranges can be combined with any other ranges, as long as the microcrystalline or chemically strengthened microcrystalline glass-ceramics having the desired properties of the present application can be obtained.

[0125] In this application, Al2O3 is an optional component. The addition of an appropriate amount helps stabilize the glass network structure and also helps to promote ion exchange during the chemical strengthening process to a certain extent. However, excessive Al2O3 can increase the viscosity of the glass and easily lead to the precipitation of other crystalline phases, such as petalite, which can reduce the content of the lithium disilicate crystalline phase and affect the interlocking structure of the lithium disilicate. Therefore, the molar percentage of Al2O3 is controlled within 0.00mol%-2.00mol%.

[0126] In some embodiments, the microcrystalline glass may contain 0.00mol%-2.00mol%, 0.00mol%-1.60mol%, 0.00mol%-1.00mol%, 0.50mol%-1.60mol%, 0.50mol%-1.00mol%, 0.00mol%-0.50mol%, 1.20mol%-1.60mol%, 0.00mol%-1.30mol%, 0.00mol%-1.20mol% or 1.00mol%-2.00mol% Al2O3. In some embodiments, the microcrystalline glass may contain 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 Al2O3, or may contain Al2O3 within a numerical range consisting of any two of the above specific numerical values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the required performance of the present application can be obtained. It should be understood that, in a specific embodiment, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass having the required performance of the present application can be obtained.

[0127] In the present application, P2O5 is an essential component as a nucleating agent. When its content is too little or too much, it will lead to poor crystallization effect and affect the optical properties of the obtained microcrystalline glass, such as reducing the transparency of the microcrystalline glass. Therefore, the molar percentage of P2O5 is controlled at 1.00mol%-3.00mol%, optionally, 1.50mol%-2.50mol%.

[0128] In some embodiments, the glass-ceramics may include 1.00mol%-3.00mol%, 1.50mol%-3.00mol%, 1.60mol%-2.80mol%, 1.50mol%-2.50mol%, 1.60mol%-2.10mol%, 1.70mol%-2.20mol%, 1.50mol%-1.60mol%, 1.70mol%-3.00mol%, 1. 60 mol%-2.50 mol%, 1.70 mol%-2.30 mol%, 1.80 mol%-2.00 mol%, 2.00 mol%-3.00 mol%, 1.80 mol%-1.90 mol%, 1.60 mol%-1.90 mol%, 1.70 mol%-1.90 mol%, 1.75 mol%-1.95 mol% or 1.50 mol%-2.00 mol% of P2O5. In some embodiments, the microcrystalline glass may contain 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% of P2O5, or may contain P2O5 within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the required performance of the present application can be obtained. It should be understood that, in a specific embodiment, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass having the required performance of the present application can be obtained.

[0129] In this application, ZrO2 is an intermediate oxide in glass formation, primarily serving as a nucleating agent and toughening agent, reducing grain size and increasing the toughness of the glass-ceramics. However, when its content is too high, it can increase the difficulty of melting the base glass, such as causing a large amount of white precipitate to form in the base glass, hindering the production of glass-ceramics with excellent optical properties. Therefore, the molar percentage of ZrO2 is controlled within a range of 2.00 mol% to 6.00 mol%, optionally 3.20 mol% to 6.00 mol%.

[0130] In some embodiments, the microcrystalline glass may contain 2.00mol%-6.00mol%, 2.30mol%-5.80mol%, 2.50mol%-5.50mol%, 2.80mol%-5.30mol%, 2.90mol%-5.10mol%, 3.00mol%-5.50mol%, 3.10mol%-4.80mol%, 4.80mol%-6.00mol%, 4.00mol%-6.00mol%, 3.20mol%-5.30mol%, 3.50mol%-5.00mol%, 3.50mol%-5.80mol%, 4.00mol%-5.00mol% or 3.20mol%-6.00mol% ZrO2. In some embodiments, the glass-ceramics may include 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% ZrO2, or may contain ZrO2 within a numerical range consisting of any two of the above specific numerical values ​​as endpoints, as long as the microcrystalline or chemically strengthened microcrystalline glass-ceramics having the desired properties of the present application can be obtained. It should be understood that, in a specific embodiment, any of the above ranges can be combined with any other ranges, as long as the microcrystalline or chemically strengthened microcrystalline glass-ceramics having the desired properties of the present application can be obtained.

[0131] In this application, CaO is used as an optional component of the network oxides that form the glass. An appropriate amount of CaO helps reduce the high-temperature viscosity of the glass, increases the density of the glass, and facilitates glass molding. It also strengthens the network structure, enhancing the stress yield during the chemical strengthening process. However, excessive CaO can lead to a sharp decrease in the crystallinity of the glass, affecting its intrinsic strength. Therefore, the molar percentage of CaO is controlled within a range of 0.00 mol% to 5.00 mol%.

[0132] In some embodiments, the glass ceramics may contain 0.00mol%-5.00mol%, 0.10mol%-4.00mol%, 0.00mol%-2.50mol%, 0.50mol%-3.80mol%, 0.00mol%-4.00mol%, 0.80mol%-2.00mol%, 0.00mol%-1.60mol%, 0.00mol%-1.00mol%, 1.50mol%-4.00mol%, 0.00mol%-2.00mol%, 1.00mol%-4.00mol% or 0.10mol%-5.00mol% of CaO. In some embodiments, the microcrystalline glass may contain 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% of CaO, or may contain CaO within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass with the required performance of the present application can be obtained. It should be understood that, in a specific embodiment, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass having the required performance of the present application can be obtained.

[0133] In the present application, Li2O is an essential component and a network exosome oxide formed by glass. It can not only provide free oxygen, improve the viscosity of the glass, and promote the melting and clarification of the glass liquid, but also is one of the main components for the formation of lithium disilicate crystals. At the same time, Li2O can also provide alkali metal 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 obtained by chemically strengthened microcrystalline glass. However, excessive Li2O may cause the stability of the glass crystallization process to deteriorate, and even precipitate other undesirable crystalline phases, which will deteriorate the optical properties of the microcrystalline glass. Therefore, the molar percentage of Li2O is controlled at 27.00mol%-32.00mol%, optionally, 28.00mol%-31.00mol%.

[0134] In some embodiments, the glass-ceramics may include 27.00 mol%-32.00 mol%, 27.50 mol%-31.00 mol%, 27.00 mol%-30.00 mol%, 27.50 mol%-29.50 mol%, 28.00 mol%-31.00 mol%, 28.50 mol%-31.00 mol%, 29.00 mol%-30.50 mol%, or 29.50 mol%-32.00 mol% of Li2O. In some embodiments, the glass-ceramics may contain 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% of Li2O, or may contain Li2O within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the required performance of the present application can be obtained. It should be understood that, in a specific embodiment, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass having the required performance of the present application can be obtained.

[0135] In this application, MgO is an optional component. An appropriate amount of MgO can regulate the glass phase composition in the microcrystalline glass. However, excessive MgO will affect the growth of the crystal and the crystal phase structure of the microcrystalline glass. Therefore, the molar percentage of MgO is controlled at 0.00mol%-2.00mol%.

[0136] In some embodiments, the glass-ceramics may include 0.00mol%-2.00mol%, 0.00mol%-1.60mol%, 0.50mol%-1.60mol%, 0.80mol%-1.50mol%, 0.00mol%-1.00mol%, 0.00mol%-0.50mol%, 0.10mol%-1.10mol%, 0.10mol%-1.50mol% or 0.00mol%-1.40mol% of MgO. In some embodiments, the glass-ceramics may include 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 may include MgO within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained.

[0137] In this application, ZnO, as a network intermediate, is an optional component. An appropriate amount of ZnO can bind free oxygen, adjust the glass structure, and remain in the glass phase of the glass-ceramics, increasing the glass viscosity. However, excessive ZnO can affect crystal growth and the crystalline structure of the glass-ceramics. Therefore, the ZnO mole percentage is controlled within a range of 0.00 mol% to 2.00 mol%.

[0138] In some embodiments, the glass-ceramics may contain 0.00mol%-2.00mol%, 0.00mol%-1.70mol%, 0.50mol%-1.60mol%, 0.80mol%-1.50mol%, 0.00mol%-1.00mol%, 0.00mol%-0.50mol%, 0.10mol%-1.10mol%, 0.10mol%-1.50mol% or 0.00mol%-1.40mol% of ZnO. In some embodiments, the glass-ceramics may include 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 may include ZnO within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired performance of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired performance of the present application can be obtained.

[0139] In this application, Na2O is an optional component and a network-external oxide. A moderate amount of Na2O provides free oxygen, improves the viscosity of the glass, promotes melting and clarification of the molten glass, and regulates the chemical strengthening rate. However, excessive Na2O not only reduces the crystallinity of the glass-ceramics but also impairs the chemical strengthening effect. Therefore, the molar percentage of Na2O is controlled within a range of 0.00 mol% to 3.00 mol%.

[0140] In some embodiments, the glass-ceramics may include 0.00mol%-3.00mol%, 0.00mol%-2.80mol%, 0.00mol%-1.00mol%, 0.10mol%-2.70mol%, 0.50mol%-1.60mol%, 0.60mol%-1.00mol%, 2.50mol%-3.00mol% or 0.00mol%-0.50mol% of Na2O. In some embodiments, the glass-ceramics may include 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%, 2.00 mol%, 2.50 mol%, 2.60 mol% or 3.00 mol% of Na2O, or may include Na2O within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained.

[0141] In this application, K2O is an oxide outside the glass network and is an optional component. A moderate amount of K2O can provide free oxygen, increasing the oxygen-to-silicon ratio in the glass structure. However, excessive K2O can affect the glass network structure, impacting the glass's optical properties, thermal stability, chemical stability, mechanical strength, and weatherability. Therefore, the molar percentage of K2O is controlled between 0.00 mol% and 1.00 mol%.

[0142] In some embodiments, the glass-ceramics may contain 0.00 mol%-1.00 mol%, 0.50 mol%-1.00 mol%, 0.00 mol%-0.50 mol%, 0.85 mol%-1.00 mol%, or 0.00 mol%-0.15 mol% of K2O. In some embodiments, the glass-ceramics may contain 0.00 mol%, 0.15 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.92 mol%, 0.95 mol%, or 1.00 mol% of K2O, or may contain K2O within a numerical range consisting of any two of the above-mentioned specific numerical values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the performance required by the present application can be obtained. It should be understood that, in a specific embodiment, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics or chemically strengthened glass-ceramics with the performance required by the present application can be obtained.

[0143] In this application, B2O3 is an optional component. An appropriate amount of B2O3 can be used as a flux and / or softener to help improve the molding and hot bending effects of the glass. However, excessive B2O3 will cause the crystallization process to be uncontrollable, resulting in deterioration of the optical properties of the microcrystalline glass. Therefore, the molar percentage of B2O3 is controlled at 0.00mol%-1.00mol%.

[0144] In some embodiments, the glass-ceramics may contain 0.00 mol%-1.00 mol%, 0.00 mol%-0.50 mol%, 0.50 mol%-1.00 mol%, 0.10 mol%-0.85 mol%, 0.85 mol%-1.00 mol%, or 0.25 mol%-0.75 mol%. In some embodiments, the glass-ceramics may contain 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 may contain B2O3 within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics having the properties required by the present application can be obtained. It should be understood that, in a specific embodiment, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass having the required performance of the present application can be obtained.

[0145] In this application, SrO is an optional component and an alkaline earth metal oxide. An appropriate amount of SrO can regulate the glass phase composition in the glass-ceramic, helping to increase the density and Young's modulus of the glass-ceramic. It also helps lower the expansion softening point of the glass-ceramic, thereby facilitating the hot bending of the glass-ceramic into 3D curved glass-ceramics. However, excessive SrO can deteriorate the optical properties of the glass-ceramic. Therefore, the molar percentage of SrO is controlled within a range of 0.00 mol% to 2.00 mol%.

[0146] In some embodiments, the glass ceramics may include 0.00mol%-2.00mol%, 0.10mol%-2.00mol%, 0.00mol%-1.00mol%, 0.10mol%-1.00mol%, 0.30mol%-1.90mol%, 0.40mol%-1.20mol%, 1.20mol%-2.00mol%, 0.00mol%-0.30mol%, 0.85mol%-1.40mol%, 0.85mol%-1.90mol%, 0.50mol%-1.20mol% or 1.00mol%-2.00mol% SrO. In some embodiments, the glass-ceramics may include 0.00 mol%, 0.30 mol%, 0.46 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.92 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%, 1.83 mol% or 2.00 mol% of SrO, or may include SrO within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained.

[0147] In some embodiments, the composition of the microcrystalline glass includes, in terms of molar percentage of oxides: SiO2: 60.00mol%-65.00mol%, Al2O3: 0.00mol%-2.00mol%, P2O5: 1.50mol%-3.00mol%, ZrO2: 2.00mol%-6.00mol%, MgO: 0.00mol%-2.00mol%, ZnO: 0.00mol%-2.00mol%, Na2O: 0.00mol%-3.00mol%, K2O: 0.00mol%-1.00mol%, Li2O: 27.00mol%-32.00mol%, CaO: 0.00mol%-4.00mol%, B2O3: 0.00mol%-1.00mol%, SrO: 0.00mol%-2.00mol%. By making the microcrystalline glass meet the above composition, not only can the microcrystalline glass be given high intrinsic strength and excellent optical properties, but also its chemical strengthening effect can be guaranteed, ensuring that the microcrystalline glass obtains a higher stress level after chemical strengthening, and thus obtains higher mechanical strength performance and excellent deformation resistance.

[0148] In some embodiments, the glass-ceramics of the present application may include other components in addition to the above composition ranges. For example, in some specific embodiments, the glass-ceramics may further include, by mole percentage of oxides, the following: Y2O3: 0.00 mol%-1.00 mol%, La2O3: 0.00 mol%-1.00 mol%, and Ta2O5: 0.00 mol%-1.00 mol%.

[0149] In this application, the selective addition of an appropriate amount of Y2O3, La2O3 or Ta2O5 helps to increase the density of the microcrystalline glass and increase its Young's modulus, but it may also increase the refractive index of the microcrystalline glass and reduce the optical properties of the microcrystalline glass. Therefore, the molar percentage of Y2O3, La2O3 or Ta2O5 is controlled at 0.00mol%-1.00mol%.

[0150] In some embodiments, in the glass-ceramics, the molar percentage of Y2O3, La2O3 or Ta2O5 can be 0.00mol%, 0.10mol%, 0.20mol%, 0.30mol%, 0.40mol%, 0.46mol%, 0.50mol%, 0.53mol%, 0.60mol%, 0.70mol%, 0.75mol%, 0.80mol%, 0.85mol%, 0.90mol%, 0.95mol% or 1.00mol%, or can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired performance of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired performance of the present application can be obtained.

[0151] In some embodiments, the composition of the glass-ceramics includes, in terms of molar percentage of oxides: SiO2: 60.50mol%-64.00mol%, Al2O3: 0.00mol%-2.00mol%, P2O5: 1.50mol%-2.50mol%, ZrO2: 3.20mol%-6.00mol%, MgO: 0.00mol%-2.00mol%, ZnO: 0.00mol%-2.00mol%, Na2O: 0.00mol%-1.00mol% ol%, K2O: 0.00mol%-1.00mol%, Li2O: 28.00mol%-31.00mol%, CaO: 0.00mol%-2.50mol%, B2O3: 0.00mol%-1.00mol%, SrO: 0.00mol%-2.00mol%, Y2O3: 0.00mol%-1.00mol%, La2O3: 0.00mol%-1.00mol%, Ta2O5: 0.00mol%-1.00mol%. By ensuring that the microcrystalline glass meets the above composition, it is beneficial to prepare chemically strengthened microcrystalline glass with a high stress level, and further conducive to ensuring that the prepared chemically strengthened microcrystalline glass has excellent mechanical strength and deformation resistance.

[0152] In some embodiments of the present application, the composition of the glass-ceramics further satisfies the following conditions, expressed as a molar percentage of each oxide in the glass-ceramics composition: 0.90≤SiO2+Li2O≤0.96. Adopting a composition that satisfies this relationship is beneficial for ensuring that a desired content of lithium disilicate crystals are precipitated in the glass-ceramics, and can effectively reduce the precipitation of other crystals (e.g., petalite crystals). This helps ensure that the glass-ceramics obtains higher intrinsic strength and optical properties, and is also beneficial for achieving a high stress level in the glass-ceramics after chemical strengthening. Furthermore, it helps ensure that the substrate glass does not lose transparency during heat treatment to prepare the glass-ceramics, or that the substrate glass does not lose transparency during the melting process. In some embodiments, the value of SiO2+Li2O can be, for example, 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 can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained.

[0153] In some embodiments of the present application, the composition of the glass-ceramics, expressed as a molar percentage of each oxide in the glass-ceramics composition, further satisfies the following: Al2O3 / SiO2≤0.030. By adjusting the content relationship of Al2O3 and SiO2, while stabilizing the glass network structure, it is beneficial to ensure the formation of the desired crystalline structure, and it is also beneficial to enable the glass-ceramics to obtain a high stress level after chemical strengthening, thereby facilitating the glass-ceramics to obtain high mechanical strength and excellent deformation resistance. In some embodiments, the value of Al2O3 / SiO2 can be, for example, 0, 0.005, 0.010, 0.015, 0.020, 0.025 or 0.030, or can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the performance required by 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 ranges, as long as the glass-ceramics or chemically strengthened glass-ceramics with the performance required by the present application can be obtained.

[0154] In some embodiments of the present application, the composition of the glass-ceramics further satisfies, measured by the molar percentage of each oxide in the glass-ceramics composition: 0.31≤ZrO2 / (CaO+ZrO2+Al2O3)≤1.50, optionally, 0.32≤ZrO2 / (CaO+ZrO2+Al2O3)≤1.20, and further optionally, 0.36≤ZrO2 / (CaO+ZrO2+Al2O3)≤1.10. By ensuring that CaO, ZrO2, and Al2O3, components that have a strengthening or toughening effect on the glass structure, meet a specific content relationship, it is beneficial to better utilize the role of each component, thereby ensuring the high intrinsic strength of the glass-ceramics and the high stress level after strengthening, and further helping to ensure that the glass-ceramics obtains high mechanical strength properties and excellent deformation resistance. In some embodiments, the value of ZrO2 / (CaO+ZrO2+Al2O3) can 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 can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the microcrystalline or chemically strengthened microcrystalline glass-ceramics having the desired performance of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline or chemically strengthened microcrystalline glass-ceramics having the desired performance of the present application can be obtained.

[0155] In some embodiments of the present application, the composition of the glass-ceramics further satisfies, measured by the molar percentage of each oxide in the glass-ceramics composition, the following: 0.10≤ZrO2 / (100%-3×Li2O)≤0.60, optionally, 0.12≤ZrO2 / (100%-3×Li2O)≤0.52, and further optionally, 0.16≤ZrO2 / (100%-3×Li2O)≤0.50. By adjusting ZrO2 and Li2O to meet a specific content relationship, it is beneficial to better utilize the nucleation and / or toughening effect of ZrO2 while ensuring that the glass-ceramics forms a desired crystalline phase structure and achieves excellent optical properties, thereby ensuring that the glass-ceramics has high intrinsic strength, and further helping to ensure that the glass-ceramics obtains high mechanical strength and excellent deformation resistance. In some embodiments, the value of ZrO2 / (100%-3×Li2O) can be, for example, 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 can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the microcrystalline or chemically strengthened microcrystalline 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 ranges, as long as the microcrystalline or chemically strengthened microcrystalline glass-ceramics having the desired properties of the present application can be obtained.

[0156] In some embodiments of the present application, the composition of the glass-ceramics, expressed as a molar percentage of each oxide in the glass-ceramics composition, further satisfies the following: 0.034 ≤ ZrO2 / SiO2 ≤ 0.100, optionally, 0.035 ≤ ZrO2 / SiO2 ≤ 0.095, and further optionally, 0.055 ≤ ZrO2 / SiO2 ≤ 0.095. By adjusting the ZrO2 and SiO2 content relationships to meet specific relationships, the toughening effect of ZrO2 is better utilized while ensuring that the glass-ceramics forms a desired crystalline structure and achieves excellent optical properties, thereby ensuring that the glass-ceramics has high intrinsic strength, thereby ensuring that the glass-ceramics obtains high mechanical strength and excellent deformation resistance. In some embodiments, the value of ZrO2 / SiO2 can be, for example, 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 can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired performance of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired performance of the present application can be obtained.

[0157] In some embodiments of the present application, the composition of the glass-ceramics, expressed as a molar percentage of each oxide in the glass-ceramics, further satisfies the following: CaO + Al2O3 ≤ 0.065, optionally, CaO + Al2O3 ≤ 0.055, and further optionally, CaO + Al2O3 ≤ 0.050. By controlling the total content of CaO and Al2O3 to meet specific requirements, the reinforcing effects of CaO and Al2O3 are maximized while avoiding interference with crystallization of the glass-ceramics, thereby ensuring that the glass-ceramics achieve a desired crystalline structure, and furthermore, that the glass-ceramics possess high mechanical strength and excellent deformation resistance. In some embodiments, the value of CaO+Al2O3 can be, for example, 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 can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained.

[0158] In some embodiments of the present application, the composition of the glass-ceramics further satisfies, measured by the molar percentage of each oxide in the glass-ceramics composition: (CaO + Al2O3) / Li2O ≤ 0.25, optionally, (CaO + Al2O3) / Li2O ≤ 0.20, and further optionally, (CaO + Al2O3) / Li2O ≤ 0.14. By adjusting CaO, Al2O3, and Li2O to meet a specific content relationship, it is beneficial to ensure that a desired content of lithium disilicate crystalline phase is precipitated in the glass-ceramics while exerting the strengthening effect of CaO and / or Al2O3, thereby ensuring that the glass-ceramics achieves a desired crystalline phase structure, which in turn helps ensure that the glass-ceramics obtains high mechanical strength and excellent deformation resistance. In some embodiments, the value of (CaO+Al2O3) / Li2O can be, for example, 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 can be a value within a numerical range consisting of 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 ranges, as long as the glass-ceramics or chemically strengthened glass-ceramics having the desired properties of the present application can be obtained.

[0159] In some embodiments of the present application, the composition of the glass-ceramics further satisfies, measured by the molar percentage of each oxide in the glass-ceramics composition: 0.12≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤6.40, optionally, 0.14≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤6.16, and further optionally, 0.50≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤3.00. By adjusting ZrO2, Na2O, SiO2, and Li2O to meet specific content relationships, the functions of each component can be better utilized, the glass-ceramics can obtain high intrinsic strength and excellent optical properties, and the glass-ceramics can obtain high stress levels and excellent deformation resistance after chemical strengthening. In some embodiments, the value of (ZrO2-Na2O) / (SiO2-2×Li2O) can 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 can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the microcrystalline glass or chemically strengthened microcrystalline glass having the desired performance of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the microcrystalline glass or chemically strengthened microcrystalline glass having the desired performance of the present application can be obtained.

[0160] In some embodiments of the present application, the composition of the glass-ceramics further satisfies the following conditions, expressed in terms of the molar percentage of each oxide in the glass-ceramics composition: Na2O / SiO2≤0.05, optionally, Na2O / SiO2≤0.04, and further optionally, Na2O / SiO2≤0.02. By adjusting Na2O and SiO2 to meet a specific content relationship, the glass-ceramics can obtain a high stress level and excellent deformation resistance after chemical strengthening. In some embodiments, the value of Na2O / SiO2 can be, for example, 0.00, 0.01, 0.02, 0.03, 0.04 or 0.05, or can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the performance required by 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 ranges, as long as the glass-ceramics or chemically strengthened glass-ceramics with the performance required by the present application can be obtained.

[0161] In some embodiments of the present application, the density of the glass-ceramics is ρ≥2.50 g / cm 3 Optionally, the density of the glass-ceramic is 2.50 g / cm3 ~2.75g / cm 3 In some embodiments of the present application, the refractive index of the glass-ceramics is ≤1.60. Glass-ceramics meeting this density and / or refractive index can ensure high intrinsic strength and excellent optical properties.

[0162] In some embodiments, the density ρ of the glass-ceramics can be 2.50 g / cm 3、 2.54g / cm 3 , 2.55g / cm 3 , 2.56g / cm 3 , 2.57g / cm 3 , 2.58g / cm 3 , 2.59g / cm 3 , 2.60g / cm 3 , 2.61g / cm 3 , 2.62g / cm 3 , 2.63g / cm 3 , 2.64g / cm 3 , 2.65g / cm 3 , 2.70g / cm 3 or 2.75g / cm 3 , or a value greater than any of the above specific values, or a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics having the properties required by 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 ranges, as long as the glass-ceramics having the properties required by the present application can be obtained.

[0163] In some embodiments, the refractive index of the glass-ceramics can be 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 below any of the above specific values, or a value within a numerical range consisting of 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 ranges, as long as the glass-ceramics having the desired properties of the present application can be obtained.

[0164] In some embodiments of the present application, the crystallinity of the glass-ceramics is 30.00wt%-90.00wt%, optionally, the crystallinity is 50.00wt%-90.00wt%, and further optionally, the crystallinity is 65.00wt%-90.00wt%. A higher content of crystalline phase is beneficial to improving the mechanical strength performance of the glass-ceramics while ensuring the excellent optical properties of the glass-ceramics. In some embodiments, the crystallinity of the glass-ceramics can be 30.00wt%-90.00wt%, 45.00wt%-85.00wt%, 50.00wt%-90.00wt%, 55.00wt%-85.00wt%, 60.00wt%-85.00wt%, 65.00wt%-90.00wt%, 70.00wt%-90.00wt% or 68.00wt%-85.00wt%. In some embodiments, the crystallinity of the glass-ceramics can be 30.00wt%, 35.00wt%, 40.00wt%, 45.00wt%, 50.00wt%, 55.00wt%, 60.00wt%, 65.00wt%, 70.00wt%, 75.00wt%, 80.00wt%, 85.00wt% or 90.00wt%, or can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the required performance of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics with the required performance of the present application can be obtained.

[0165] In some embodiments of the present application, "the main crystalline phase is lithium disilicate" or "the lithium disilicate crystalline phase has a higher weight percentage than other crystalline phases present in the microcrystalline glass" and similar expressions mean that the lithium disilicate crystalline phase accounts for greater than about 70 weight percent (wt %) of all crystalline phases of the microcrystalline glass according to the embodiments of the present application.

[0166] In some embodiments of the present application, non-limiting examples of other possible crystalline phases in the glass-ceramics include: a petalite crystalline phase, and / or a lithium phosphate crystalline phase. In some embodiments, the glass-ceramics further comprises a petalite crystalline phase. Optionally, the petalite crystalline phase accounts for less than or equal to 20% by weight of the glass-ceramics. Further optionally, the petalite crystalline phase accounts for less than or equal to 15%, less than or equal to 10%, or less than or equal to 5% by weight of the glass-ceramics. By controlling the precipitation of other crystalline phases, it is more conducive to ensuring that lithium disilicate forms a desired interlocking structure, thereby ensuring that the glass-ceramics obtains high mechanical strength, excellent optical properties, and excellent deformation resistance.

[0167] In some embodiments of the present application, in the glass-ceramics, the average crystal size is ≤100nm, optionally, the average crystal size is ≤50nm, and further optionally, the average crystal size is 15nm to 45nm. Meeting a smaller average crystal size is conducive to ensuring that the glass-ceramics have excellent optical properties. In some embodiments, the average crystal size can be 10nm to 100nm, 20nm to 90nm, 30nm to 80nm, 40nm to 60nm, 10nm to 30nm, 10nm to 20nm, 5nm to 35nm, 15nm to 35nm, or 15nm to 45nm. 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 can be a value within a numerical range consisting of 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 ranges, as long as the glass-ceramics having the desired properties of the present application can be obtained.

[0168] In some embodiments of the present application, the Young's modulus of the glass-ceramics is ≥100.00GPa, optionally, the Young's modulus of the glass-ceramics is ≥110.00GPa, optionally, the Young's modulus of the glass-ceramics is ≥110.00GPa, further optionally, the Young's modulus of the glass-ceramics is 114GPa~130GPa. Having a higher Young's modulus indicates that the glass-ceramics has a higher intrinsic strength, which is conducive to obtaining higher mechanical strength properties and excellent deformation resistance. In some embodiments, the Young's modulus of the glass-ceramics can be 100.00GPa-150GPa, 105.00GPa-140GPa, 110.00GPa-130GPa, 114GPa~130GPa or 114.00GPa-125GPa. 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 can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics having the desired performance of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics having the desired performance of the present application can be obtained.

[0169] In some embodiments of the present application, when the glass-ceramic is 0.5 mm thick, the b-value of the glass-ceramic is ≤1.0, optionally, the b-value is ≤0.8. Glass-ceramic that meets this optical b-value can ensure better optical performance and display effects, and is suitable for use in display screens that require display effects. In some embodiments, when the glass-ceramic is 0.5 mm thick, 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 can be a value below any of the above-mentioned specific values, or can be a value within the numerical range consisting of any two of the above-mentioned specific values ​​as endpoints, as long as the glass-ceramic or chemically strengthened glass-ceramic with the performance required by the present application can be obtained. It should be understood that in a specific embodiment, any of the above-mentioned ranges can be combined with any other ranges, as long as the glass-ceramic with the performance required by the present application can be obtained.

[0170] In some embodiments of the present application, the glass-ceramic is transparent in the visible light range; when the glass-ceramic is 0.5mm thick, for light with a wavelength of 550nm, the transmittance of the glass-ceramic is ≥85.00%, and optionally, the transmittance of the glass-ceramic is ≥90.00%. Glass-ceramic that meets this transmittance can ensure good light transmittance and transparency, making it suitable for use in display screens with high display requirements. The "visible light range" here refers to light in the 360nm-740nm band.

[0171] In some embodiments, when the glass-ceramics is 0.5 mm thick, for light of 550 nm wavelength, the transmittance of the glass-ceramics can be 85.00%, 86.00%, 87.00%, 88.00%, 89.00%, 90.00%, 90.50%, 91.00% or 92.00%, or can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics having the desired performance of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics having the desired performance of the present application can be obtained.

[0172] The microcrystalline glass of the present application has a high transmittance and a low b value, which indicates that the optical performance of the microcrystalline glass of the present application is excellent and uniform, and it is in a transparent state and can meet the application requirements of display cover glass.

[0173] In some embodiments of the present application, the upper limit crystallization temperature of the substrate glass corresponding to the microcrystalline glass is between 1000° C. and 1100° C. Meeting this upper limit crystallization temperature range is conducive to industrial mass production.

[0174] In some embodiments of the present application, the expansion softening point of the glass-ceramics is between 750°C and 850°C. Optionally, the expansion softening point of the glass-ceramics is between 750°C and 830°C. A suitable expansion softening point is conducive to the 3D hot bending of the glass-ceramics to obtain 3D curved glass-ceramics with high strength. In some embodiments, the expansion softening point of the glass-ceramics 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 can be a value within the numerical range consisting of any two of the above specific values ​​as endpoints. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics with the performance required by this application can be obtained.

[0175] In the present application, after the glass-ceramics is subjected to a heat bending process, a 3D curved glass-ceramics can be prepared. When the product composition is calculated in terms of the molar percentage of oxides, the composition of the 3D curved glass-ceramics is the same as or substantially the same as that of the glass-ceramics.

[0176] The glass-ceramics of the present application can be prepared by heat-treating a substrate glass. The composition of the substrate glass used is the same or substantially the same as that of the glass-ceramics in terms of the molar percentage of oxides.

[0177] In this application, the substrate glass can be prepared using existing molding methods, and this application does not impose any restrictions on this. For example, the molding method may include, but is not limited to, float, overflow, rolling, or casting. For example, the raw materials and clarifiers can be uniformly mixed (with a uniformity of over 98%), melted, molded, and then annealed to produce the substrate glass. Furthermore, the process parameters may include a melting temperature of 1480°C to 1680°C, an annealing temperature of 450°C to 650°C, and a holding time of 10 to 48 hours at the annealing temperature. Furthermore, the clarifier may include, but is not limited to, one or more of sodium chloride, tin oxide, antimony oxide, or arsenic oxide, and the amount of clarifier added may be 0 to 1 wt% of the total amount of the raw materials.

[0178] In the present application, when the substrate glass is heat-treated to prepare microcrystalline glass, the heat treatment can be carried out in a crystallization furnace or an annealing furnace, for example. The heat treatment method may include, but is not limited to, one-step heat treatment, two-step heat treatment or multi-step heat treatment. For example, it may include a two-step heat treatment of nucleation treatment followed by crystallization treatment. The process conditions of the heat treatment may include, but are not limited to: the nucleation temperature may be 500℃-700℃, the nucleation holding time may be 10min-1440min; the crystallization temperature may be 600℃-800℃, the crystallization holding time may be 5min-1440min; the heating rate of the whole process may be 5℃ / min-20℃ / min, and the cooling rate may be 0.1℃ / min-3℃ / min. After the heat treatment, those skilled in the art may also perform other conventional steps to obtain microcrystalline glass samples that meet the required specifications or requirements, such as cutting, CNC machining (computer numerical control, i.e., CNC machine tools) or polishing.

[0179] In the present application, a chemically strengthened microcrystalline glass is also provided, wherein the composition at the center of the chemically strengthened microcrystalline glass is the same as that of the previous microcrystalline glass, the chemically strengthened microcrystalline glass includes a compressive stress layer region extending from the surface of the chemically strengthened microcrystalline glass to the compression depth, and has tensile stress inside the chemically strengthened microcrystalline glass.

[0180] It should be understood that the composition of the surface of the glass-ceramic product after chemical strengthening may be different from the composition of the glass-ceramic before chemical strengthening (not subjected to the ion exchange process). This is because, during chemical strengthening, one type of alkali metal ion (e.g., Li ion) at the surface of the newly formed glass-ceramic (glass-ceramic before chemical strengthening) + Or Na + ) are replaced by larger alkali metal ions (e.g., Na + or K + ) is replaced. However, in the embodiments, the glass composition and phase assembly at or near the depth center of the glass-ceramic product will still have the composition and phase assembly of the newly 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 that has been chemically strengthened are the same or substantially the same as those of the newly formed glass-ceramic.

[0181] In the present application, the chemically strengthened microcrystalline glass contains a lithium disilicate crystalline phase, wherein the lithium disilicate crystalline phase has a higher weight percentage than other crystalline phases present in the chemically strengthened microcrystalline glass; the composition at the center of the chemically strengthened microcrystalline glass includes, in terms of molar percentage of oxides: SiO2: 55.00mol%-65.00mol%, Al2O3: 0.00mol%-2.00mol%, P2O5: 1.00mol%-3.00mol%, ZrO2: 2.00mol%-6.00mol%. %, MgO: 0.00mol%-2.00mol%, ZnO: 0.00mol%-2.00mol%, Na2O: 0.00mol%-3.00mol%, K2O: 0.00mol%-1.00mol%, Li2O: 27.00mol%-32.00mol%, CaO: 0.00mol%-5.00mol%, B2O3: 0.00mol%-1.00mol%, SrO: 0.00mol%-2.00mol%;

[0182] The composition at the center of the chemically strengthened microcrystalline glass satisfies, in terms of content expressed in molar percentage of oxides: 2.00≤SiO2 / Li2O≤2.40, optionally, 2.00≤SiO2 / Li2O≤2.30, and further optionally, 2.02≤SiO2 / Li2O≤2.20.

[0183] In some embodiments of the present application, the composition at the center of the chemically strengthened microcrystalline glass, expressed in terms of the content expressed in molar percentage of oxides, 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.

[0184] In some embodiments of the present application, the composition at the center of the chemically strengthened microcrystalline glass, measured in molar percentage of oxides, includes: SiO2: 60.00mol%-65.00mol%, Al2O3: 0.00mol%-2.00mol%, P2O5: 1.50mol%-3.00mol%, ZrO2: 2.00mol%-6.00mol%, MgO: 0.00mol%-2.00mol%, ZnO: 0.00mol%-2.00mol%, Na2O: 0.00mol%-3.00mol%, K2O: 0.00mol%-1.00mol%, Li2O: 27.00mol%-32.00mol%, CaO: 0.00mol%-4.00mol%, B2O3: 0.00mol%-1.00mol%, SrO: 0.00mol%-2.00mol%.

[0185] In some embodiments of the present application, the composition at the center of the chemically strengthened glass-ceramics further includes, in terms of molar percentage of oxides: Y2O3: 0.00mol%-1.00mol%, La2O3: 0.00mol%-1.00mol%, Ta2O5: 0.00mol%-1.00mol%.

[0186] In some embodiments of the present application, the composition at the center of the chemically strengthened glass-ceramics, in terms of molar percentage of oxides, includes: SiO2: 60.50mol%-64.00mol%, Al2O3: 0.00mol%-2.00mol%, P2O5: 1.50mol%-2.50mol%, ZrO2: 3.20mol%-6.00mol%, MgO: 0.00mol%-2.00mol%, ZnO: 0.00mol%-2.00mol%, Na2O: 0.00mol% -1.00mol%, K2O: 0.00mol%-1.00mol%, Li2O: 28.00mol%-31.00mol%, CaO: 0.00mol%-2.50mol%, B2O3: 0.00mol%-1.00 mol%, SrO: 0.00mol%-2.00mol%, Y2O3: 0.00mol%-1.00mol%, La2O3: 0.00mol%-1.00mol%, Ta2O5: 0.00mol%-1.00mol%.

[0187] In some embodiments of the present application, the chemically strengthened glass-ceramics has a DOL_0 of 0.18t-0.25t, where DOL_0 is the depth of the compressive stress layer and t is the thickness of the chemically strengthened glass-ceramics. In some embodiments, the depth of the compressive stress layer DOL_0 of the chemically strengthened glass-ceramics may 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-ceramics is 0.5 mm, the DOL_0 of the chemically strengthened glass-ceramics 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 can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramics having the desired performance of the present application can be obtained. It should be understood that, in a specific embodiment, any of the above ranges can be combined with any other ranges, as long as the chemically strengthened glass-ceramics having the desired performance of the present application can be obtained. The DOL_0 of the chemically strengthened microcrystalline glass is within the above range, indicating that the chemically strengthened microcrystalline glass has a high compressive stress layer depth, which is more conducive to offsetting the energy driving crack expansion, thereby ensuring that it has excellent damage resistance and excellent deformation resistance.

[0188] In some embodiments of the present application, the chemically strengthened glass-ceramics has a |CT_AV| of 85 MPa-200 MPa, where |CT_AV| is the absolute value of the average tensile stress; alternatively, it has a |CT_AV| of 90 MPa-200 MPa. In some embodiments, the chemically strengthened glass-ceramics has a |CT_AV| of 85 MPa-200 MPa, 90 MPa-200 MPa, 90 MPa-180 MPa, 100 MPa-150 MPa, 130 MPa-180 MPa, 85 MPa-100 MPa, 85 MPa-120 MPa, 90 MPa-150 MPa, 95 MPa-180 MPa, 100 MPa-140 MPa, 130 MPa-200 MPa, or 120 MPa-140 MPa. In some embodiments, the chemically strengthened glass-ceramics has a |CT_AV| of 85MPa, 90MPa, 100MPa, 110MPa, 120MPa, 130MPa, 140MPa, 150MPa, 160MPa, 170MPa, 180MPa, 190MPa, or 200MPa, or has a |CT_AV| within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramics with the performance required by the present application can be obtained. It should be understood that in a specific embodiment, any of the above ranges can be combined with any other ranges, as long as the chemically strengthened glass-ceramics with the performance required by the present application can be obtained. The |CT_AV| of the chemically strengthened glass-ceramics is within the above range, indicating that the chemically strengthened glass-ceramics has a higher tensile stress level, reflecting that it has a higher surface stress level, and the higher surface compressive stress level can offset more residual energy from falling, squeezing, impact, or collision, thereby ensuring that it has excellent damage resistance and excellent deformation resistance.

[0189] In some embodiments of the present application, the chemically strengthened glass-ceramics has a CT_LD of 50,000 MPa / mm-100,000 MPa / mm, where CT_LD is the tensile stress linear density; optionally, it has a CT_LD of 55,000 MPa / mm-100,000 MPa / mm. In some embodiments, the chemically strengthened glass-ceramics has a CT_LD of 50,000 MPa / mm-100,000 MPa / mm, 55,000 MPa / mm-95,000 MPa / mm, 60,000 MPa / mm-90,000 MPa / mm, 65,000 MPa / mm-85,000 MPa / mm, 70,000 MPa / mm-80,000 MPa / mm, 65,000 MPa / mm-100,000 MPa / mm, 60,000 MPa / mm-80,000 MPa / mm, or 60,000 MPa / mm-100,000 MPa / mm. In some embodiments, the chemically strengthened glass-ceramics has a CT_LD of 50,000 MPa / mm, 55,000 MPa / mm, 60,000 MPa / mm, 65,000 MPa / mm, 70,000 MPa / mm, 75,000 MPa / mm, 80,000 MPa / mm, 85,000 MPa / mm, 90,000 MPa / mm, 95,000 MPa / mm, or 100,000 MPa / mm, or has a CT_LD within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. The CT_LD of the chemically strengthened glass-ceramics is within the above range, indicating that the tensile stress stored inside the chemically strengthened glass-ceramics is relatively dense, indicating that the chemically strengthened glass-ceramics has a higher surface stress level, thereby ensuring that it has excellent damage resistance and excellent deformation resistance.

[0190] In some embodiments of the present application, the chemically strengthened glass-ceramics have a |CT_CV| of 120 MPa to 320 MPa. Alternatively, the chemically strengthened glass-ceramics have a |CT_CV| of 135 MPa to 300 MPa. Further optionally, the chemically strengthened glass-ceramics have 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 have 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 has a |CT_CV| within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. The |CT_CV| of the chemically strengthened microcrystalline glass is within the above range, indicating that the chemically strengthened microcrystalline glass has a higher tensile stress level, reflecting that it has a higher surface stress level. The higher the surface compressive stress level, the more residual energy from falling, squeezing, impact or collision can be offset, thereby ensuring that it has excellent damage resistance and excellent deformation resistance.

[0191] In some embodiments of the present application, the Vickers hardness of the chemically strengthened glass-ceramics is greater than or equal to 680 kgf / mm 2 Optionally, the chemically strengthened glass-ceramics has a Vickers hardness of 700 kgf / mm 2 ~800kgf / mm 2 In some embodiments, the chemically strengthened glass-ceramics has a strength of 680 kgf / mm 2 , 700kgf / mm 2 、710kgf / mm 2 、720kgf / mm 2 、730kgf / mm 2 、740kgf / mm 2 , 750kgf / mm 2 、760kgf / mm 2、770kgf / mm 2 、780kgf / mm 2 、790kgf / mm 2 or 800kgf / mm 2 A Vickers hardness of , or a Vickers hardness within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramics 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 ranges, as long as the chemically strengthened glass-ceramics having the desired properties of the present application is obtained. The Vickers hardness of the chemically strengthened glass-ceramics being within the above range indicates that the chemically strengthened glass-ceramics has high hardness, thereby ensuring that it has excellent mechanical properties.

[0192] 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.

[0193] In the present 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 mechanical strength properties, excellent damage resistance and excellent deformation resistance.

[0194] In some embodiments of the present application, when a chemically strengthened glass-ceramic is 0.5 mm thick and a 10 mm diameter round-end metal pressure rod is used to compress the center of the main surface of the chemically strengthened glass-ceramic, when the center of the main surface of the chemically strengthened glass-ceramic is subjected to a 10 kgf load, the deformation of the chemically strengthened glass-ceramic at the stress-bearing location in the direction of the stress is ≤ 0.850 mm. The smaller the deformation of the chemically strengthened glass-ceramic after being squeezed, the greater its deformation resistance. When used as cover glass for display screens, the smaller the deformation after being squeezed or impacted, the lower the probability of contact with the inner glass screen, which helps to alleviate the problem of inner glass screen failure caused by impact on the cover glass. In some embodiments, when the chemically strengthened microcrystalline glass is 0.5 mm thick, when the center of the main surface of the chemically strengthened microcrystalline glass is subjected to a load of 10 kgf, the deformation of the stress position of the chemically strengthened microcrystalline glass in 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 it can be a value below any of the above specific values, or it can be a value within the numerical range formed by any two of the above specific values ​​as endpoints.

[0195] In some embodiments of the present application, when the chemically strengthened glass-ceramic is 0.5 mm thick, a 10 mm diameter round-headed metal pressure rod is used to squeeze the center of the main surface of the chemically strengthened glass-ceramic. When the center of the main surface of the chemically strengthened glass-ceramic undergoes a deformation of 0.400 mm along the direction of force, the load borne by the center of the main surface of the chemically strengthened glass-ceramic is ≥ 30 N. When a certain deformation occurs, the greater the load that the chemically strengthened glass-ceramic can withstand, the greater the load that the deformation can offset when the chemically strengthened glass-ceramic is subjected to compression or impact. Therefore, when the deformation contacts the inner glass screen, the compression or impact load on the inner glass screen is reduced, and the possibility of failure of the inner glass screen is reduced. Using chemically strengthened glass-ceramic, which can withstand or offset large loads, as cover glass, helps to alleviate the problem of inner glass screen failure caused by impact or compression of the cover glass. In some embodiments, when the chemically strengthened microcrystalline glass is 0.5 mm thick, a 10 mm diameter round-headed metal pressure rod is used to squeeze the center of the main surface of the chemically strengthened microcrystalline glass. When the center of the main surface of the chemically strengthened microcrystalline glass is deformed by 0.400 mm along the direction of force, the load borne by the center of the main surface of the chemically strengthened microcrystalline glass can be 36.9N, 38.6N, 38.5N, 33.8N, 37.2N, 34.9N, 37.4N, 39.2N, 38.1N, 37.6N, 38.7N, 37.8N, 38.4N, 39.4N or 40.0N, or it can be a value above any of the above specific values, or it can be a value within the numerical range formed by any two of the above specific values ​​as endpoints.

[0196] The chemically strengthened glass-ceramics of the present application can be obtained by chemically strengthening the glass-ceramics mentioned above. The chemical strengthening process can be carried out in accordance with the process in the prior art, as long as the chemically strengthened glass-ceramics with the properties required by the present application can be obtained. For example, it can include but is not limited to: first heating a molten salt containing a certain sodium ion concentration to the temperature required for chemical strengthening, then preheating the glass-ceramics (for example, a heating rate of 5°C / min-100°C / min can be used during preheating) to the required chemical strengthening temperature and then placing it in the molten salt, and after constant temperature treatment for the required time for chemical strengthening, taking it out, cooling it to room temperature, cleaning the salt attached to the surface, and drying it to obtain a chemically strengthened glass-ceramics with a high stress level and excellent deformation resistance.

[0197] In some embodiments of the present application, the temperature of the molten salt bath for chemical strengthening treatment can be 380°C-550°C, and the time of chemical strengthening treatment can be 0.5h-24h, as long as the chemically strengthened microcrystalline glass with the required performance of the present application can be obtained.

[0198] In some embodiments of the present application, the molten salt composition includes, by weight, 5-50% sodium salt, 50-95% potassium salt, and 0.01-0.30% lithium salt. Furthermore, the sodium salt, potassium salt, and lithium salt selected can each independently be a nitrate, sulfate, phosphate, or carbonate, as long as the chemically strengthened glass-ceramics having the desired properties is obtained. In some embodiments, after the chemical strengthening treatment is completed, the cooling rate of the chemically strengthened glass-ceramics can be 1°C / min to 50°C / min.

[0199] In this application, the chemically strengthened glass-ceramic prepared from the aforementioned high-strength and transparent glass-ceramic exhibits excellent deformation resistance and drop damage resistance. When used as cover glass for electronic devices, this chemically strengthened glass-ceramic not only ensures that the cover glass is resistant to shattering, but also effectively prevents the cover glass from being squeezed or impacted, potentially causing the inner screen to break or fail, thereby ensuring better protection for the inner screen.

[0200] The transparent microcrystalline glass or chemically strengthened microcrystalline glass provided by the present application, which has excellent mechanical strength and excellent deformation resistance, can be used in electronic devices, including but not limited to mobile phones, tablet computers, handheld game consoles, portable digital devices (such as digital cameras), vehicle-mounted central control, electronic whiteboard glass, smart home, and can also be used in vehicles, aircraft or aircraft, and can also be used in any glass device of desired microcrystalline glass. For example, it can be used for display screens, cover glass, touch screens, glass inner screens or inner frames of electronic devices; for example, it can be used for windshields of vehicles, aircraft or aircraft, such as front windshields or side windshields. For example, it can be used for worktops, other surfaces, appliance doors, floor tiles, wall panels or storage containers. Other surfaces can include but are not limited to exterior wall surfaces, stair tread surfaces, column veneers or counter surfaces, and storage containers can include but are not limited to cups, plates, medicine bottles or beverage bottles.

[0201] The embodiments of the present application are described in detail below. These embodiments are exemplary and are only used to explain the present application. They should not be construed as limiting the present application.

[0202] In the example numbers of the following tables: S refers to an embodiment, such as S1 refers to Example 1; D refers to a comparative example, such as D1 refers to Comparative Example 1.

[0203] Example 1

[0204] (1) Preparation of substrate glass:

[0205] Prepare raw materials with a total mass of 1000g (the raw materials are configured according to the formula of S1 in Table 1, and the proportions of each oxide are shown in Table 2), and add 5g of sodium chloride to the configured raw materials, mix at a speed of 25r / min in a V-type mixer for 30min, and melt in a platinum crucible at 1650℃ for 5h, then pour into a mold to form a glass brick, cool to 900℃, put into a 460℃ annealing furnace for annealing for 12h, and then cool to room temperature with the furnace to obtain the base glass brick.

[0206] (2) Preparation of glass-ceramics: The base glass brick was placed in a crystallization furnace and heated from room temperature to 525°C at a rate of 10°C / min for nucleation. After being kept at this temperature for 240 min, the temperature was then raised to 685°C at a rate of 10°C / min for crystallization. The temperature was kept at this temperature for 60 min, and then cooled to room temperature at a rate of 1°C / min to obtain a glass-ceramic sample brick. The composition of the prepared glass-ceramics was the same as that of the base glass in terms of molar percentage of oxides, as shown in Tables 1 and 2.

[0207] The obtained glass-ceramic bricks are sequentially cut, CNC-machined (the CNC equipment model used in this application is RCG500S), and polished to produce glass-ceramic samples that meet the required specifications and requirements. In this application, the glass-ceramic bricks were subjected to the aforementioned cold working treatment to produce glass-ceramic samples with a thickness of 0.50 mm, specifically, 50 mm × 50 mm × 0.5 mm glass-ceramic polished sheet samples.

[0208] Test results of the glass-ceramics obtained in S1:

[0209] The main crystal phase, crystallinity, average crystal size, expansion softening point, density, refractive index, Young's modulus of the microcrystalline glass, as well as the optical b value and transmittance (under 550nm wavelength light) of the microcrystalline glass sample with a thickness of 0.5mm were tested respectively, and the results are shown in Table 3.

[0210] (3) Preparation of chemically strengthened microcrystalline glass: The obtained microcrystalline glass sample is placed in the strengthening furnace cavity for preheating for 5 minutes. After preheating, it is quickly placed in molten salt at 450°C 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 hours, the glass sample is taken out and placed on the strengthening furnace body to slowly cool to room temperature. The salt wrapped on the glass surface is washed off with clean water. After the glass sample is dried, the chemically strengthened microcrystalline glass can be obtained.

[0211] Test results of chemically strengthened glass-ceramics obtained in S1:

[0212] Ⅰ. The chemically strengthened microcrystalline glass was measured using an SLP 2000 stress meter (the light source wavelength used was 518 nm, SOC = 25.5 (nm / cm) / MPa, the refractive index was set according to the refractive index value of the microcrystalline glass sample, the refractive index of the microcrystalline glass sample in S1 was 1.5600, and the exposure time was 300 μsec). |CT_CV|, DOL_0, and |CT_AV| were measured; the tensile stress linear density (CT_LD) value was then calculated. The results are shown in Table 4.

[0213] II. The Vickers hardness of the chemically strengthened glass-ceramics was tested. The results are shown in Table 4.

[0214] III. Testing the deformation resistance of chemically strengthened glass-ceramics, such as the deformation of chemically strengthened glass-ceramics under a load of 10 kgf; and the load borne by chemically strengthened glass-ceramics when a deformation of 0.40 mm occurs. The results are shown in Table 4.

[0215] Example 2-Example 18

[0216] The above steps are respectively carried out with reference to Example 1, except that the raw material composition, different process parameters and corresponding test results of each example are shown in Tables 1 to 4, respectively.

[0217] The DSC curve of the substrate glass of Example 3 is shown in FIG1 , which can be used as a reference to determine the heat treatment process used when preparing glass-ceramics from the substrate glass.

[0218] The XRD spectrum of the glass-ceramics of Example 3 is shown in FIG2 . It can be seen from the figure that the main crystalline phase in the glass-ceramics is the lithium disilicate crystalline phase.

[0219] The transmittance curve of the glass-ceramics of Example 3 is shown in FIG3 . As can be seen from the figure, the glass-ceramics is transparent in the visible light range and has a high transmittance.

[0220] The load-deformation curve of the chemically strengthened microcrystalline glass of Example 3 is shown in FIG4 , from which it can be seen that the deformation of the chemically strengthened microcrystalline glass under different load extrusions, as well as the load conditions borne by the chemically strengthened microcrystalline glass when different deformations occur.

[0221] Comparative Example 1-Comparative Example 8

[0222] The above methods are respectively carried out with reference to Example 1, except that the raw material composition, different process parameters and corresponding test results of each comparative example are shown in Tables 5 to 8, respectively.

[0223] The load-deformation curve of the chemically strengthened glass-ceramics of Comparative Example 3 is shown in FIG5 .

[0224] Crystallization upper limit temperature test: In order to analyze the industrial mass production feasibility of the microcrystalline glass of the present application, the crystallization upper limit temperature of the substrate glass of some embodiments was tested. Among them, 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 lower than 1100°C. The crystallization upper limit temperature is between 1000°C and 1100°C, indicating that the microcrystalline glass of the present application is conducive to industrial mass production.

[0225] 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 embodiments was tested, see Table 3 for details. From the test results, it can be seen that the expansion softening point of the microcrystalline glass of the present application is lower than 830°C, and is between 750°C and 850°C, indicating that the microcrystalline glass of the present application is conducive to 3D hot bending forming to prepare 3D curved microcrystalline glass.

[0226] Table 1 Note: In Table 1, an oxide content of "0.00%" indicates that the component was not actively or intentionally added to the glass composition during the initial batching process, but the component may be present as an impurity.

[0227] Table 2 Note: In Table 2, the percentages of the oxides are substituted into the formulas in terms of molar percentage. For example, if the molar percentage of Al2O3 is 2%, then 2% is substituted into the formula.

[0228] Table 3 Note: In Table 3, “ / ” means not tested.

[0229] Table 4

[0230] Table 5 Note: In Table 5, an oxide content of "0.00%" indicates that the component was not actively or intentionally added to the glass composition during the initial batching process, but the component may be present as an impurity.

[0231] Table 6 Note: In Table 6, the percentages are substituted into the formulas based on the molar percentage of the oxides. This means that the molar unit is not used in the calculations. For example, if the molar percentage of Al2O3 is 2%, 2% would be substituted into the formula.

[0232] Table 7

[0233] Table 8

[0234] It can be seen from the examples in Tables 1 to 4 and the comparative examples in Tables 5 to 8 that, relative to the comparative example, the embodiment scheme of the present application satisfies the content range of each oxide while also satisfying the specific oxide content relationship, and the obtained microcrystalline glass has excellent optical properties and high Young's modulus, and the lithium disilicate crystal phase is the main crystal phase of the microcrystalline glass. Moreover, the chemically strengthened microcrystalline glass prepared by the microcrystalline glass of the embodiment of the present application can obtain a high stress level and high mechanical strength performance, and its deformation resistance is significantly better than the comparative example. In addition, the upper limit temperature of crystallization of the substrate glass corresponding to the microcrystalline glass of the embodiment of the present application is relatively low, indicating that it is suitable for industrial mass production. At the same time, the expansion softening point temperature of the microcrystalline glass of the embodiment of the present application is appropriate, indicating that it is suitable for 3D hot bending to form 3D curved microcrystalline glass.

[0235] However, in the solutions of Comparative Examples 1 to 8, the glass formulas do not simultaneously meet: the content ranges of the various oxides in this application, as well as the specific oxide content relationships. The resulting microcrystalline glass either has poor optical properties, or it is impossible to prepare chemically strengthened microcrystalline glass with superior deformation resistance.

[0236] By comparing Figure 4 and Figure 5, it can be seen that when the center of the main surface of the chemically strengthened microcrystalline glass of Example 3 of the present application is squeezed and deformed by 0.40 mm, the load it bears or offsets is significantly greater than that of Comparative Example 3. It can be seen that the chemically strengthened microcrystalline glass of the present application has better anti-deformation ability.

[0237] The preferred embodiments of the present application are described in detail above, 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 solution of the present application, including combining the various technical features in any other appropriate manner. These simple modifications and combinations should also be regarded as the contents disclosed in the present application and fall within the scope of protection of the present application. Industrial Applicability

[0238] This application ensures that the microcrystalline glass has high intrinsic strength and excellent optical properties by making the microcrystalline glass containing lithium disilicate as the main crystalline phase meet specific oxide content and specific oxide content relationship, and ensures that the microcrystalline glass can be formed into chemically strengthened microcrystalline glass with high stress level and excellent deformation resistance through chemical strengthening.

Claims

1. A glass-ceramic, characterized in that: The glass-ceramics comprises a lithium disilicate crystalline phase, wherein the lithium disilicate crystalline phase has a higher weight percentage than other crystalline phases present in the glass-ceramics; Measured in mole percentage of oxides, the composition of the glass-ceramics includes: SiO2: 55.00mol%-65.00mol%, Al2O3: 0.00mol%-2.00mol%, P2O5: 1.00mol%-3.00mol%, ZrO2: 2.00mol%-6.00mol%, MgO: 0.00mol%-2.00mol%, ZnO: 0.00mol%-2.00mol%, Na2O: 0.00mol%-3.00mol%, K2O: 0.00mol%-1 .00mol%, Li2O: 27.00mol%-32.00mol%, CaO: 0.00mol%-5.00mol%, B2O3: 0.00mol%-1.00mol%, SrO: 0.00mol%-2.00mol%; The composition of the microcrystalline glass satisfies the following conditions: 2.00≤SiO2 / Li2O≤2.40, optionally, 2.00≤SiO2 / Li2O≤2.30, and further optionally, 2.02≤SiO2 / Li2O≤2.20, expressed as the molar percentage of each oxide in the microcrystalline glass composition.

2. The glass-ceramic according to claim 1, characterized in that The composition of the glass-ceramics further satisfies the following requirements, expressed as a molar percentage of each oxide in the glass-ceramics: 0.90≤SiO2+Li2O≤0.96, optionally, 0.90≤SiO2+Li2O≤0.95; and / or, Al2O3 / SiO2≤0.

030.

3. The glass-ceramics according to claim 1 or 2, characterized in that: The composition of the glass-ceramics further satisfies, in terms of the content expressed as a molar percentage of each oxide in the glass-ceramics composition: 0.31≤ZrO2 / (CaO+ZrO2+Al2O3)≤1.50, optionally, 0.32≤ZrO2 / (CaO+ZrO2+Al2O3)≤1.20, further optionally, 0.36≤ZrO2 / (CaO+ZrO2+Al2O3)≤1.10; and / or, 0.10≤ZrO2 / (100%-3×Li2O)≤0.60, optionally, 0.12≤ZrO2 / (100%-3×Li2O)≤0.52, further optionally, 0.16≤ZrO2 / (100%-3×Li2O)≤0.50; and / or, 0.034≤ZrO2 / SiO2≤0.100, optionally, 0.035≤ZrO2 / SiO2≤0.095, further optionally, 0.055≤ZrO2 / SiO2≤0.

095.

4. The glass-ceramic according to any one of claims 1 to 3, characterized in that The composition of the glass-ceramics further satisfies, in terms of the content expressed as a molar percentage of each oxide in the composition of the glass-ceramics, the following: CaO+Al2O3≤0.065, optionally, CaO+Al2O3≤0.055, further optionally, CaO+Al2O3≤0.050; and / or, (CaO+Al2O3) / Li2O≤0.25, optionally, (CaO+Al2O3) / Li2O≤0.20, further optionally, (CaO+Al2O3) / Li2O≤0.

14.

5. The glass-ceramic according to any one of claims 1 to 4, characterized in that: The composition of the glass-ceramics further satisfies, in terms of the content expressed as a molar percentage of each oxide in the glass-ceramics composition: 0.12≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤6.40, optionally, 0.14≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤6.16, further optionally, 0.50≤(ZrO2-Na2O) / (SiO2-2×Li2O)≤3.00; and / or, Na2O / SiO2≤0.05, optionally, Na2O / SiO2≤0.04, further optionally, Na2O / SiO2≤0.

02.

6. The glass-ceramic according to any one of claims 1 to 5, characterized in that: In terms of molar percentage of oxides, the glass-ceramics has a SiO2 content of 60.00 mol% to 65.00 mol%, optionally, a SiO2 content of 60.50 mol% to 64.00 mol%; and / or, The content of Li2O is 28.00mol%-31.00mol%, optionally, the content of Li2O is 29.00mol%-30.50mol%; and / or, The content of ZrO2 is 3.20mol%-6.00mol%, optionally, the content of ZrO2 is 4.00mol% to 6.00mol%; and / or, The content of P2O5 is 1.50mol%-3.00mol%, optionally, the content of P2O5 is 1.50mol%-2.50mol%; and / or, The content of Na2O is 0.00mol%-1.00mol%, optionally, the content of Na2O is 0.00mol%-0.50mol%; and / or, The content of CaO is 0.00 mol% to 4.00 mol%. Alternatively, the content of CaO is 0.00 mol% to 2.50 mol%.

7. The glass-ceramics according to any one of claims 1 to 6, characterized in that: Calculated in molar percentage of oxides, the composition of the microcrystalline glass also includes: Y2O3: 0.00mol%-1.00mol%, La2O3: 0.00mol%-1.00mol%, Ta2O5: 0.00mol%-1.00mol%.

8. The glass-ceramic according to any one of claims 1 to 7, characterized in that: Calculated as a molar percentage of oxides, the sum of the contents of Na2O and K2O in the microcrystalline glass is less than 1.00 mol%.

9. The glass-ceramic according to any one of claims 1 to 8, characterized in that: The density of the glass-ceramics is ρ≥2.50 g / cm 3 Optionally, the density ρ of the glass-ceramics is 2.50 g / cm 3 ~2.75g / cm 3 ; and / or, the refractive index of the microcrystalline glass is ≤1.

60.

10. The glass-ceramic according to any one of claims 1 to 9, characterized in that: The crystallinity of the glass-ceramics is 30.00 wt% to 90.00 wt%, optionally, the crystallinity is 50.00 wt% to 90.00 wt%, further optionally, the crystallinity is 65.00 wt% to 90.00 wt%; and / or, In the glass-ceramics, the average crystal size is ≤100 nm, optionally, the average crystal size is ≤50 nm, and further optionally, the average crystal size is 15 nm to 45 nm.

11. The glass-ceramic according to any one of claims 1 to 10, characterized in that: The Young's modulus of the glass-ceramics is ≥100.00 GPa. Optionally, the Young's modulus of the glass-ceramics is ≥110.00 GPa. Further optionally, the Young's modulus of the glass-ceramics is 114 GPa to 130 GPa.

12. The glass-ceramic according to any one of claims 1 to 11, characterized in that: At a thickness of 0.5 mm, the b value of the glass-ceramics is ≤1.0, optionally, the b value is ≤0.8; and / or, The microcrystalline glass is transparent in the visible light range; at a thickness of 0.5 mm, for light with a wavelength of 550 nm, the transmittance of the microcrystalline glass is ≥85.00%. Optionally, the transmittance of the microcrystalline glass is ≥90.00%.

13. The glass-ceramic according to any one of claims 1 to 12, characterized in that: The expansion softening point of the glass-ceramics is 750°C to 850°C. Optionally, the expansion softening point of the glass-ceramics is 750°C to 830°C.

14. A chemically strengthened glass-ceramic, characterized in that: The composition at the center of the chemically strengthened microcrystalline glass is the same as the composition of the microcrystalline glass described in any one of claims 1-13, and the chemically strengthened microcrystalline glass includes a compressive stress layer region extending from the surface of the chemically strengthened microcrystalline glass to the compression depth, and has tensile stress inside the chemically strengthened microcrystalline glass.

15. The chemically strengthened glass-ceramics according to claim 14, wherein: The chemically strengthened glass-ceramics contains a 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-ceramics; the composition at the center of the chemically strengthened glass-ceramics, measured in molar percentage of oxides, includes: SiO2: 55.00mol%-65.00mol%, Al2O3: 0.00mol%-2.00mol%, P2O5: 1.00mol%-3.00mol%, and ZrO2: 2.00mol%-6.00mol%. , MgO: 0.00mol%-2.00mol%, ZnO: 0.00mol%-2.00mol%, Na2O: 0.00mol%-3.00mol%, K2O: 0.00mol%-1.00mol%, L i2O: 27.00mol%-32.00mol%, CaO: 0.00mol%-5.00mol%, B2O3: 0.00mol%-1.00mol%, SrO: 0.00mol%-2.00mol%; The composition at the center of the chemically strengthened glass-ceramics satisfies, in terms of content expressed in molar percentage of oxides: 2.00≤SiO2 / Li2O≤2.40, optionally, 2.00≤SiO2 / Li2O≤2.30, and further optionally, 2.02≤SiO2 / Li2O≤2.

20.

16. The chemically strengthened glass-ceramics according to claim 14 or 15, characterized in that: The composition at the center of the chemically strengthened glass-ceramics further satisfies the following requirements, expressed in terms of the content expressed as a molar percentage of oxides: 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.

17. The chemically strengthened glass-ceramics according to any one of claims 14 to 16, characterized in that: The composition at the center of the chemically strengthened glass-ceramics comprises, in terms of molar percentage of oxides: The content of SiO2 is 60.00mol%-65.00mol%, optionally, the content of SiO2 is 60.50mol%-64.00mol%; and / or, The content of Li2O is 28.00mol%-31.00mol%, optionally, the content of Li2O is 29.00mol%-30.50mol%; and / or, The content of ZrO2 is 3.20mol%-6.00mol%, optionally, the content of ZrO2 is 4.00mol% to 6.00mol%; and / or, The content of P2O5 is 1.50mol%-3.00mol%, optionally, the content of P2O5 is 1.50mol%-2.50mol%; and / or, The content of Na2O is 0.00mol%-1.00mol%, optionally, the content of Na2O is 0.00mol%-0.50mol%; and / or, The content of CaO is 0.00 mol% to 4.00 mol%. Alternatively, the content of CaO is 0.00 mol% to 2.50 mol%.

18. The chemically strengthened glass-ceramics according to any one of claims 14 to 17, characterized in that Calculated in molar percentage of oxides, the composition at the center of the chemically strengthened glass-ceramics further includes: Y2O3: 0.00mol%-1.00mol%, La2O3: 0.00mol%-1.00mol%, and Ta2O5: 0.00mol%-1.00mol%.

19. The chemically strengthened glass-ceramics according to any one of claims 14 to 18, characterized in that The chemically strengthened glass-ceramics has a DOL_0 of 0.18t-0.25t. Optionally, the chemically strengthened glass-ceramics has a DOL_0 of 0.20t-0.25t, where t is the thickness of the chemically strengthened glass-ceramics.

20. The chemically strengthened glass-ceramics according to any one of claims 14 to 19, characterized in that The chemically strengthened glass-ceramics has a |CT_AV| of 85MPa-200MPa. Optionally, the chemically strengthened glass-ceramics has a |CT_AV| of 90MPa-200MPa. Further optionally, the chemically strengthened glass-ceramics has a |CT_AV| of 130MPa-200MPa, where |CT_AV| is the absolute value of the average tensile stress.

21. The chemically strengthened glass-ceramics according to any one of claims 14 to 20, characterized in that: The chemically strengthened glass-ceramics has a CT_LD of 50,000 MPa / mm-100,000 MPa / mm. Optionally, the chemically strengthened glass-ceramics has a CT_LD of 55,000 MPa / mm-100,000 MPa / mm. Further optionally, the chemically strengthened glass-ceramics has a CT_LD of 65,000 MPa / mm-100,000 MPa / mm, where CT_LD is the tensile stress linear density.

22. The chemically strengthened glass-ceramics according to any one of claims 14 to 21, characterized in that: The chemically strengthened glass-ceramics has a |CT_CV| of 120 MPa-320 MPa. Optionally, the chemically strengthened glass-ceramics has a |CT_CV| of 135 MPa-300 MPa. Further optionally, the chemically strengthened glass-ceramics has a |CT_CV| of 160 MPa-300 MPa.

23. The chemically strengthened glass-ceramics according to any one of claims 14 to 22, characterized in that: The Vickers hardness of the chemically strengthened glass-ceramics is greater than or equal to 680 kgf / mm 2 Optionally, the Vickers hardness of the chemically strengthened glass-ceramics is 700 kgf / mm 2 ~800kgf / mm 2 .

24. The chemically strengthened glass-ceramics according to any one of claims 14 to 23, wherein: When the chemically strengthened microcrystalline glass is 0.5 mm thick, a 10 mm diameter round-headed metal pressure rod is used to squeeze the center of the main surface of the chemically strengthened microcrystalline glass. When the center of the main surface of the chemically strengthened microcrystalline glass is subjected to a load of 10 kgf, the deformation of the stress position of the chemically strengthened microcrystalline glass in the stress direction is ≤0.850 mm.

25. The chemically strengthened glass-ceramics according to any one of claims 14 to 24, characterized in that When the chemically strengthened microcrystalline glass is 0.5 mm thick, a 10 mm diameter round-headed metal pressure rod is used to squeeze the center of the main surface of the chemically strengthened microcrystalline glass. When the center of the main surface of the chemically strengthened microcrystalline glass undergoes a deformation of 0.400 mm along the direction of force, the load borne by the center of the main surface of the chemically strengthened microcrystalline glass is ≥30 N.

26. A glass device, characterized in that: The glass device comprises the glass-ceramics according to any one of claims 1 to 13 or the chemically strengthened glass-ceramics according to any one of claims 14 to 25.

27. An electronic device, characterized in that: The electronic device includes the glass-ceramics according to any one of claims 1 to 13 or includes the chemically strengthened glass-ceramics according to any one of claims 14 to 25.