A glass-ceramic with a high lithium content, chemically strengthened glass-ceramic and its applications

Abstract

This application belongs to the technical field of glass-ceramics, and specifically relates to a glass-ceramic with a high lithium content, a chemically strengthened glass-ceramic and its applications. The glass-ceramic with a high lithium content contains the main crystal phase of lithium disilicate crystal phase, and has specific ranges of the contents of various oxides. Calculated by the contents expressed in mole percentages of various oxides in the composition of the glass-ceramic with a high lithium content, its composition satisfies: 0.20 ≤ 2.25×Li₂O - 8×ZrO₂ - 0.2×CaO ≤ 0.41. The glass-ceramic with a high lithium content in this application can not only achieve high-temperature chemical strengthening, avoiding the problems of "surface cracking" and / or surface "peeling" in a high-temperature salt bath, but also ensure the preparation of a chemically strengthened glass-ceramic that meets the requirements of high stress level and high mechanical strength performance.

Description

Technical Field

[0001] This application belongs to the technical field of glass-ceramics, and particularly relates to a glass-ceramics with high lithium content, chemically strengthened glass-ceramics and their applications. Background Art

[0002] As a solid material containing microcrystalline phase and glass phase, glass-ceramics have obvious advantages in overall strength performance compared with conventional glass because a large number of nanoscale microcrystals contained therein can hinder the propagation of microcracks. At present, glass-ceramics have begun to be gradually applied to portable electronic devices as cover glass for electronic devices, such as display protection glass or back cover glass.

[0003] The Li2Si2O5 crystal phase is an orthorhombic crystal based on a [Si2O5] tetrahedral array, and the crystal shape is flat or plate-like. Inside the glass-ceramics, the Li2Si2O5 crystals have a random orientation and interlocked microstructure, forcing the crack path to twist when passing through the crystals, thereby preventing crack propagation and improving the strength and fracture toughness of the glass-ceramics. At the same time, the light refractive index of the Li2Si2O5 crystals is close to that of the glass matrix (e.g., the base glass for preparing glass-ceramics), making it an ideal crystal phase for preparing highly transparent glass-ceramics. Therefore, it can be seen that glass-ceramics with a main Li2Si2O5 crystal phase have great application potential in the market of cover glass for electronic products or electronic devices. Summary of the Invention

[0004] As the cover glass for electronic devices, especially for portable electronic devices (such as mobile phones, watches, PADs, etc.), the thickness is generally less than 2 mm. Exemplarily, the thickness of the cover glass for electronic devices can be about 0.1 mm - 2.0 mm. Therefore, in order to meet high-performance requirements such as anti-drop, anti-compression, scratch resistance, and wear resistance, it is usually necessary to chemically strengthen the cover glass of electronic devices to further improve its mechanical strength performance. Here, the so-called "chemical strengthening" means placing the glass in a molten salt bath and using alkali metal ions with large ionic radii in the molten salt to exchange with alkali metal ions with small ionic radii in the glass, thereby generating compressive stress on the glass surface. In order to improve the efficiency of chemical strengthening treatment and reduce production costs, the industry generally considers using a high-temperature molten salt bath to chemically strengthen the glass.

[0005] However, for the glass-ceramics in the prior art that have a high lithium content and contain a lithium disilicate main crystal phase, when they are chemically strengthened in a high-temperature molten salt bath (e.g., the salt bath temperature is above 480 °C), "surface cracking" and / or "peeling" phenomena are likely to occur. Here, "surface cracking" mainly refers to a large number of irregular cracks appearing on the surface of the glass-ceramics after chemical strengthening, and "peeling" mainly refers to the outermost layer peeling off from the glass-ceramics after chemical strengthening, and the thickness of the peeled glass layer is between a few micrometers and dozens of micrometers. The "surface cracking" and / or "peeling" phenomena will cause a significant reduction in the drop resistance and mechanical strength of the glass-ceramics, and even lead to the surface failure of the glass-ceramics after chemical strengthening and make them unusable.

[0006] The object of the present application is: to overcome the defects of "surface cracking" and / or "peeling" existing in the glass-ceramics in the prior art that have a high lithium content and contain a lithium disilicate main crystal phase when they are chemically strengthened in a high-temperature salt bath (e.g., the salt bath temperature is above 480 °C), and to provide a high-lithium-content glass-ceramics suitable for high-temperature chemical strengthening with a lithium disilicate main crystal phase, chemically strengthened glass-ceramics and their applications. After high-temperature chemical strengthening, the high-lithium-content glass-ceramics not only overcome the problems of "surface cracking" and / or "peeling", but also can obtain chemically strengthened glass-ceramics with a high stress level after high-temperature chemical strengthening. By using the high-lithium-content glass-ceramics for high-temperature chemical strengthening treatment to obtain chemically strengthened glass-ceramics with high stress levels and high mechanical strength properties, the efficiency of preparing high-strength chemically strengthened glass-ceramics can be greatly improved.

[0007] To achieve the above object, the present application provides the following technical solutions:

[0008] 1. A high-lithium-content glass-ceramics, wherein the high-lithium-content glass-ceramics contain a lithium disilicate crystal phase, and the lithium disilicate crystal phase has a higher weight percentage than other crystal phases present in the high-lithium-content glass-ceramics;

[0009] In terms of the molar percentage of oxides, the composition of the high-lithium-content glass-ceramics includes:

[0010] SiO2: 41.00 mol% - 69.50 mol%, Al2O3: 0.00 mol% - 2.00 mol%, P2O5: 1.50 mol% - 3.00 mol%, ZrO2: 2.00 mol% - 6.00 mol%, MgO: 0.00 mol% - 2.00 mol%, ZnO: 0.00 mol% - 2.00 mol%, Na2O: 0.00 mol% - 3.00 mol%, K2O: 0.00 mol% - 1.00 mol%, Li2O: 27.00 mol% - 32.00 mol%, CaO: 0.00 mol% - 5.00 mol%, B2O3: 0.00 mol% - 1.00 mol%, SrO: 0.00 mol% - 2.00 mol%;

[0011] Based on the content expressed as the molar percentage of each oxide in the high-lithium-content glass-ceramic composition, the composition of the high-lithium-content glass-ceramic satisfies: 0.20 ≤ 2.25×Li2O - 8×ZrO2 - 0.2×CaO ≤ 0.41, preferably 0.21 ≤ 2.25×Li2O - 8×ZrO2 - 0.2×CaO ≤ 0.39. By optimizing the glass formula, a specific content relationship is satisfied among the components, enabling the components to 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 spodumene crystal phase), thereby helping to ensure the obtained glass-ceramic with high intrinsic strength and excellent optical properties, with lithium disilicate as the main crystal phase. On the other hand, it is beneficial to ensure that the glass-ceramic meets specific composition and structure, thus ensuring that it can achieve high-temperature chemical strengthening and ensuring that during the high-temperature chemical strengthening process, there will be no "surface cracking" and / or surface "peeling" problems, which further helps to improve its chemical strengthening efficiency and can ensure that the prepared chemically strengthened glass-ceramic meets high stress levels (such as having high CS_50, |CT_AV|, DOL_0, etc.) and high mechanical strength properties.

[0012] 2. The high-lithium-content glass-ceramic according to Technical Solution 1, wherein, based on the content expressed as the molar percentage of each oxide in the high-lithium-content glass-ceramic composition, the composition of the high-lithium-content glass-ceramic also satisfies: 0.25 ≤ (2.2×ZrO2 + 0.35×CaO + Na2O) / Li2O ≤ 0.45; preferably 0.27 ≤ (2.2×ZrO2 + 0.35×CaO + Na2O) / Li2O ≤ 0.43. By making the composition of the glass-ceramic satisfy this relationship, it is beneficial to avoid the "surface cracking" and / or "peeling" phenomena when the high-lithium-content glass-ceramic is strengthened in a high-temperature molten salt bath while ensuring that the high-lithium-content glass-ceramic has high intrinsic strength and excellent optical properties.

[0013] 3. The high-lithium-content glass-ceramics according to Technical Solution 1 or 2, wherein, based on the contents expressed in mole percentages of the respective oxides in the composition of the high-lithium-content glass-ceramics, the composition of the high-lithium-content glass-ceramics satisfies:

[0014] 0 ≤ (CaO + MgO + ZnO + Na2O + K2O) / (ZrO2 + Li2O) ≤ 0.15; and / or,

[0015] 0.90 ≤ SiO2 + Li2O ≤ 0.95; and / or,

[0016] 2.00 ≤ SiO2 / Li2O ≤ 2.30; and / or,

[0017] 0 ≤ (CaO + SrO) / ZrO2 ≤ 1.50; and / or,

[0018] 0 ≤ Al2O3 / (SiO2 + Al2O3) ≤ 0.03. By making the composition satisfy at least one of the above relationships, it is beneficial to further improve the structure of the glass, thereby facilitating the preparation of high-lithium-content glass-ceramics with a specific structure and excellent properties (especially optical properties, strength properties, etc.). It is also beneficial to ensure the chemical strengthening effect of the high-lithium-content glass-ceramics, ensuring that the high-lithium-content glass-ceramics can be prepared into chemically strengthened glass-ceramics with a high stress level, excellent mechanical strength properties, and excellent anti-damage properties through chemical strengthening.

[0019] It should be noted that in the above formulas of the present application, the content percentages in moles are substituted into each formula, that is, the mole unit does not participate in the calculation of the formula. Exemplarily, if the content of Al2O3 in moles is 2%, then 2% is substituted into the formula for calculation.

[0020] 4. The high-lithium-content glass-ceramics according to any one of Technical Solutions 1-3, wherein, based on the mole percentages of the oxides, in the high-lithium-content glass-ceramics:

[0021] The content of SiO2 is 60.00 mol% - 65.00 mol%, preferably the content of SiO2 is 61.00 mol% - 63.50 mol%; and / or, the content of Li2O is 27.50 mol% - 31.00 mol%, preferably the content of Li2O is 28.00 mol% - 30.50 mol%; and / or, the content of ZrO2 is 3.00 mol% - 6.00 mol%, preferably the content of ZrO2 is 3.50 mol% - 6.00 mol%; and / or, the content of P2O5 is 1.50 mol% - 2.50 mol%, preferably the content of P2O5 is 1.60 mol% - 2.10 mol%; and / or, the content of CaO is 0.00 mol% - 4.00 mol%, preferably the content of CaO is 0.00 mol% - 2.00 mol%. By adjusting the composition of the high-lithium-content glass-ceramics, it is beneficial to enable the high-lithium-content glass-ceramics to obtain higher mechanical strength performance and anti-damage performance.

[0022] 5. The high-lithium-content glass-ceramics according to any one of Technical Solutions 1 - 4, wherein, in terms of the molar percentage of oxides, the composition of the high-lithium-content glass-ceramics further includes: Y2O3: 0.00 mol% - 1.00 mol%, La2O3: 0.00 mol% - 1.00 mol%, Ta2O5: 0.00 mol% - 1.00 mol%. In the glass system of the present application, the selective addition of an appropriate amount of Y2O3, La2O3 or Ta2O5 helps to increase the density of the high-lithium-content glass-ceramics and increase its Young's modulus, but at the same time, it may also increase the refractive index of the high-lithium-content glass-ceramics, reducing the optical performance of the high-lithium-content glass-ceramics.

[0023] 6. The high-lithium-content glass-ceramics according to any one of Technical Solutions 1 - 5, wherein, based on the content expressed in the molar percentage of each oxide in the composition of the high-lithium-content glass-ceramics, the composition of the high-lithium-content glass-ceramics satisfies:

[0024] 0 ≤ (CaO + MgO + ZnO + Na2O + K2O) / (ZrO2 + Li2O) ≤ 0.10; and / or,

[0025] 0.90 ≤ SiO2 + Li2O ≤ 0.93; and / or,

[0026] 0 ≤ (CaO + SrO) / ZrO2 ≤ 1.00, preferably 0 ≤ (CaO + SrO) / ZrO2 ≤ 0.70. By making the composition satisfy at least one of the above relationships, it is beneficial to further improve the structure of the glass, more beneficial to prepare chemically strengthened glass-ceramics with a higher stress level, and thus beneficial to ensure that the prepared chemically strengthened glass-ceramics have excellent mechanical strength performance and anti-damage performance.

[0027] 7. The high-lithium-content glass-ceramics according to any one of Technical Solutions 1-6, wherein the density ρ of the high-lithium-content glass-ceramics ≥ 2.54 g / cm 3 , and the refractive index ≤ 1.60. The high-lithium-content glass-ceramics satisfying such density and refractive index can ensure relatively high intrinsic strength and excellent optical properties.

[0028] 8. The high-lithium-content glass-ceramics according to any one of Technical Solutions 1-7, wherein at a thickness of 0.5 mm, the b value of the high-lithium-content glass-ceramics ≤ 1.0, and preferably the b value ≤ 0.8. The high-lithium-content glass-ceramics satisfying such optical b value can ensure relatively excellent optical properties and display effects, and are suitable for use in display screens with requirements for display effects.

[0029] 9. The high-lithium-content glass-ceramics according to any one of Technical Solutions 1-8, wherein the high-lithium-content glass-ceramics are transparent in the visible light range, and / or at a thickness of 0.5 mm, for light with a wavelength of 550 nm, the transmittance of the high-lithium-content glass-ceramics ≥ 85.00%, and preferably the transmittance ≥ 90.00%. The high-lithium-content glass-ceramics satisfying relatively high transmittance can ensure relatively good light transmittance and good transparency effects, and are suitable for use in display screens with requirements for display effects.

[0030] 10. The high-lithium-content glass-ceramics according to any one of Technical Solutions 1-9, wherein the crystallinity of the high-lithium-content glass-ceramics is 30.00 wt% - 90.00 wt%, and preferably the crystallinity is 50.00 wt% - 90.00 wt%. A relatively high content of the crystalline phase is beneficial to improving the mechanical strength performance of the high-lithium-content glass-ceramics.

[0031] 11. The high-lithium-content glass-ceramics according to any one of Technical Solutions 1-10, wherein in the high-lithium-content glass-ceramics, the average crystal size ≤ 100 nm, preferably the average crystal size ≤ 50 nm, and more preferably the average crystal size is 15 nm - 45 nm. Satisfying a relatively small average crystal size is beneficial to ensuring that the high-lithium-content glass-ceramics have excellent optical properties.

[0032] 12. The high-lithium-content glass-ceramics according to any one of Technical Solutions 1-11, wherein the Young's modulus of the high-lithium-content glass-ceramics ≥ 100.00 GPa, preferably the Young's modulus of the high-lithium-content glass-ceramics ≥ 110.00 GPa, and more preferably the Young's modulus of the high-lithium-content glass-ceramics is 114 GPa - 130 GPa. Having a relatively high Young's modulus indicates that the high-lithium-content glass-ceramics have relatively high intrinsic strength, which is beneficial to their obtaining relatively high mechanical strength performance and anti-damage performance.

[0033] 13. The high-lithium-content glass-ceramic according to any one of Technical Solutions 1-12, wherein the softening point of the high-lithium-content glass-ceramic due to thermal expansion is 750°C - 820°C. The appropriate softening point due to thermal expansion is conducive to the 3D thermoforming of the high-lithium-content glass-ceramic to obtain a 3D curved glass-ceramic with high strength performance.

[0034] 14. A chemically strengthened glass-ceramic, wherein the composition at the center of the chemically strengthened glass-ceramic is the same as that of the high-lithium-content glass-ceramic according to any one of Technical Solutions 1-13. The chemically strengthened glass-ceramic includes a region of a compressive stress layer extending from the surface of the chemically strengthened glass-ceramic to the depth of compression and has a tensile stress inside the chemically strengthened glass-ceramic.

[0035] 15. The chemically strengthened glass-ceramic according to Technical Solution 14, wherein the chemically strengthened glass-ceramic contains a lithium disilicate crystal phase, and the lithium disilicate crystal phase has a higher weight percentage than other crystal phases present in the chemically strengthened glass-ceramic; in terms of the molar percentage of oxides, the composition at the center of the chemically strengthened glass-ceramic includes:

[0036] SiO2: 41.00 mol% - 69.50 mol%, Al2O3: 0.00 mol% - 2.00 mol%, P2O5: 1.50 mol% - 3.00 mol%, ZrO2: 2.00 mol% - 6.00 mol%, MgO: 0.00 mol% - 2.00 mol%, ZnO: 0.00 mol% - 2.00 mol%, Na2O: 0.00 mol% - 3.00 mol%, K2O: 0.00 mol% - 1.00 mol%, Li2O: 27.00 mol% - 32.00 mol%, CaO: 0.00 mol% - 5.00 mol%, B2O3: 0.00 mol% - 1.00 mol%, SrO: 0.00 mol% - 2.00 mol%;

[0037] Based on the content expressed by the molar percentage of each oxide in the composition at the center of the chemically strengthened glass-ceramic, the composition at the center of the chemically strengthened glass-ceramic satisfies: 0.20 ≤ 2.25×Li2O - 8×ZrO2 - 0.2×CaO ≤ 0.41, preferably 0.21 ≤ 2.25×Li2O - 8×ZrO2 - 0.2×CaO ≤ 0.39.

[0038] 16. The chemically strengthened glass-ceramics according to technical solution 14 or 15, wherein the chemically strengthened glass-ceramics has a DOL_0 of 0.20t - 0.25t, preferably has a DOL_0 of 0.22t - 0.25t, DOL_0 is the depth of the compressive stress layer, and t is the thickness of the chemically strengthened glass-ceramics. The DOL_0 of the chemically strengthened glass-ceramics within the above range indicates that the chemically strengthened glass-ceramics has a high depth of the compressive stress layer, which is beneficial to offset the energy driving crack propagation, and thus ensures its excellent anti-damage performance, such as excellent anti-drop performance.

[0039] 17. The chemically strengthened glass-ceramics according to any one of technical solutions 14 - 16, wherein the chemically strengthened glass-ceramics has a |CT_AV| of 80 MPa - 200 MPa, |CT_AV| is the absolute value of the average tensile stress; preferably has a |CT_AV| of 90 MPa - 200 MPa; more preferably has a |CT_AV| of 130 MPa - 200 MPa. The |CT_AV| of the chemically strengthened glass-ceramics within the above range indicates that the chemically strengthened glass-ceramics has a relatively high tensile stress level, reflecting its relatively high surface compressive stress level, and the more remaining energy of drop, extrusion, impact or collision that can be offset by the relatively high surface compressive stress level, thus ensuring its excellent anti-damage performance.

[0040] 18. The chemically strengthened glass-ceramics according to any one of technical solutions 14 - 17, wherein the chemically strengthened glass-ceramics has a CT_LD of 50000 MPa / mm - 100000 MPa / mm, CT_LD is the tensile stress line density; preferably has a CT_LD of 55000 MPa / mm - 100000 MPa / mm; more preferably has a CT_LD of 65000 MPa / mm - 100000 MPa / mm. The range of CT_LD of the chemically strengthened glass-ceramics within the above range indicates that the tensile stress stored inside the chemically strengthened glass-ceramics is relatively dense, indicating that the chemically strengthened glass-ceramics has a relatively high surface compressive stress level, and thus ensures its excellent anti-damage performance, such as excellent anti-drop performance.

[0041] 19. The chemically strengthened glass-ceramic according to any one of technical solutions 14-18, wherein the chemically strengthened glass-ceramic has a CS_50 of 150 MPa - 280 MPa, and CS_50 refers to the compressive stress value at a depth of 50 μm measured from the main surface of the chemically strengthened glass-ceramic; preferably, it has a CS_50 of 160 MPa - 280 MPa; more preferably, it has a CS_50 of 180 MPa - 280 MPa. The CS_50 of the chemically strengthened glass-ceramic within the above range indicates that the compressive stress at a depth of 50 μm measured from the surface of the chemically strengthened glass-ceramic is high, indicating that the chemically strengthened glass-ceramic has a high surface compressive stress level. And the more residual energy of dropping, extrusion, impact or collision that can be offset by the higher surface compressive stress level, thereby ensuring its excellent anti-damage performance, such as excellent anti-drop performance.

[0042] 20. The chemically strengthened glass-ceramic according to any one of technical solutions 14-19, wherein an 80-mesh sandpaper is used to perform an anti-sandpaper drop test on the chemically strengthened glass-ceramic with a thickness of 0.5 mm, and the average anti-sandpaper drop height of the chemically strengthened glass-ceramic is ≥ 1.0 m, preferably the average anti-sandpaper drop height is ≥ 1.2 m, and more preferably the average anti-sandpaper drop height is ≥ 1.5 m. This indicates that the chemically strengthened glass-ceramic has excellent anti-drop performance.

[0043] 21. A glass device, wherein the glass device comprises the high-lithium-content glass-ceramic according to any one of technical solutions 1-13 or comprises the chemically strengthened glass-ceramic according to any one of technical solutions 14-20.

[0044] 22. An electronic device, wherein the electronic device includes the high-lithium-content glass-ceramic according to any one of technical solutions 1-13 or includes the chemically strengthened glass-ceramic according to any one of technical solutions 14-20.

[0045] Beneficial effects:

[0046] In this application, by making the high-lithium-content glass-ceramic containing the main crystal phase lithium disilicate satisfy specific composition and structure, especially satisfying the oxide content under specific conditions and the relationship of specific oxide contents, it not only ensures that it can achieve high-temperature chemical strengthening, ensures that during the high-temperature chemical strengthening process, problems such as "surface cracking" and / or surface "peeling" do not occur, improving its chemical strengthening efficiency, but also can ensure that the prepared chemically strengthened glass-ceramic meets high stress levels (such as having high CS_50, |CT_AV|, DOL_0, etc.) and high mechanical strength performance. Using the high-lithium-content glass-ceramic of this application, a chemically strengthened glass-ceramic that takes into account excellent optical performance and mechanical strength performance can be prepared, which is beneficial to broadening its application scenarios and application fields. Description of the Drawings

[0047] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following accompanying drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related accompanying drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 It is a physical picture of the chemically strengthened glass-ceramics of Example 1 under strong light.

[0049] Figure 2 It is a physical picture of the chemically strengthened glass-ceramics of Example 2 under strong light.

[0050] Figure 3 It is a micrograph of the cross-section of the chemically strengthened glass-ceramics of Example 1 along the thickness direction under an optical microscope (magnified 200 times); where A points to the surface of the chemically strengthened glass-ceramics of Example 1, and B points to the inside of the chemically strengthened glass-ceramics of Example 1.

[0051] Figure 4 It is a physical picture of the chemically strengthened glass-ceramics of Comparative Example 1 under strong light irradiation, and there is a "surface cracking" phenomenon in the chemically strengthened glass-ceramics;

[0052] Figure 4A It is a micrograph of the cross-section of the chemically strengthened glass-ceramics of Comparative Example 1 along the thickness direction under an optical microscope (magnified 200 times);

[0053] Figure 4B It is a micrograph of a local area of the main surface of the chemically strengthened glass-ceramics of Comparative Example 1 under an optical microscope (magnified 50 times);

[0054] Figure 4A 、 Figure 4B In, 1 points to the inside of the chemically strengthened glass-ceramics of Comparative Example 1, 2 points to the "crack" area on the main surface of the chemically strengthened glass-ceramics of Comparative Example 1, and 3 points to air.

[0055] Figure 5 It is a physical picture of the chemically strengthened glass-ceramics of Comparative Example 12 under natural light, and there is a surface "peeling" phenomenon in the chemically strengthened glass-ceramics.

[0056] Figure 6 It is a micrograph of the cross-section of the chemically strengthened glass-ceramics of Comparative Example 12 along the thickness direction under an optical microscope (magnified 50 times); where 4 points to the inside of the chemically strengthened glass-ceramics of Comparative Example 12, and 5 points to the surface "peeling" area of the chemically strengthened glass-ceramics of Comparative Example 12.

[0057] Figure 7 This is the transmittance curve of the high-lithium-content glass-ceramics of Example 6 in the 360nm-740nm band.

[0058] Figure 8 This is the XRD pattern of the high-lithium-content microcrystalline glass of Example 6.

[0059] Figure 9 3 and 4 are XRD patterns of the glass-ceramics in Comparative Example 1 before and after chemical strengthening; wherein, curve A is the XRD pattern of the glass-ceramics in Comparative Example 1, and curve B is the XRD pattern of the chemically strengthened glass-ceramics in Comparative Example 1.

[0060] Figure 10 It is the XRD spectrum of the high-lithium-content microcrystalline glass in Example 4 before and after chemical strengthening; wherein, curve C is the XRD spectrum of the high-lithium-content microcrystalline glass in Example 4, and curve D is the XRD spectrum of the chemically strengthened microcrystalline glass in Example 4.

[0061] Figure 11 This is a test curve of the thermal expansion coefficient of the high-lithium-content glass-ceramics of Example 8. The temperature shown in the figure is the expansion softening point temperature of the high-lithium-content glass-ceramics. DETAILED DESCRIPTION

[0062] 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 herein. Among them, the terms "optional" and "optional" all mean that they may be included or not (or may be present or not).

[0063] Glossary and test methods:

[0064] "Surface cracking" refers to the phenomenon in which chemically strengthened glass (such as chemically strengthened microcrystalline glass) shows obvious cracks on the surface when exposed to strong light.

[0065] Surface "peeling" phenomenon: refers to the phenomenon in which the surface glass of chemically strengthened glass (such as chemically strengthened microcrystalline glass) separates from the glass body.

[0066] Base glass: glass that has not been subjected to nucleation, crystallization or strengthening treatment.

[0067] 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.

[0068] Chemically strengthened glass-ceramics: refers to a solid composite material obtained after chemically strengthening glass-ceramics. During high-temperature chemical strengthening treatment, alkali metal ions with a large ionic radius (such as potassium ions or sodium ions) in the molten salt bath will replace alkali metal ions with a small ionic radius (such as sodium ions or lithium ions) in the glass-ceramics, thereby generating a difference in the volume of the exchanged ions and producing a compressive stress (or also called a compression stress) on the surface of the glass-ceramics.

[0069] Nucleation: By heat treatment, small crystal nuclei grow from the nucleating substances in the glass.

[0070] Crystallization: The glass grows a certain crystal on the basis of crystal nuclei through heat treatment.

[0071] Crystal phase: The crystal phase is the microscopic structure of the crystal, which is a general term for the parts composed of a large number of crystalline solid phases, or also called a crystal.

[0072] Main crystal phase: Or also called the main crystal phase, which refers to the crystal phase with a higher weight content than other crystal phases existing in the glass-ceramics.

[0073] Main surface: It refers to the surface with the largest surface area in a glass brick or a glass sheet, such as the upper and lower surfaces of a cover glass.

[0074] Crystallinity: It refers to the percentage of the total mass of the crystal phase or crystal in the glass-ceramics in the mass of the glass-ceramics, or also called the total content of the crystal phase in the glass-ceramics.

[0075] Refractive index: The refractive index refers to the ratio of the speed of light in a vacuum to the speed of light in this medium.

[0076] Transmittance: When light with a certain wavelength irradiates 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.

[0077] SOC: Photoelastic coefficient. Photoelasticity mainly refers to the phenomenon that when a transparent material is stressed, anisotropy occurs and birefringence appears. By measuring the photoelastic coefficient and birefringence, the value of the residual stress (unit: MPa) inside the material can be obtained.

[0078] CT_LD: It refers to the linear density of the tensile stress, with the unit of MPa / mm. It should be understood that after the glass-ceramics are placed in a molten salt bath for ion exchange, a compressive stress layer (or also called a compression 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 exchange ions 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:

[0079]

[0080] 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.

[0081] CS_50: refers to the compressive stress value at a depth of 50μm measured from the main surface of the chemically strengthened microcrystalline glass, the unit is MPa.

[0082] |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.

[0083] 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.

[0084] b value: used to characterize the yellow-blue value of a material. The optical b value in the present invention is the b value of transmitted light, and a positive optical b value indicates that the material is blue.

[0085] 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.

[0086] Glass thickness: measured using 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. The total Na-K and / or Li-Na exchange typically does not exceed 1.5% of the sample's mass, and the difference in ion radius is typically on the order of micrometers. 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 negligible and very small.

[0087] Glass sheet size measurement: A two-dimensional measuring machine (instrument model: Miyu MY-YXCL-4030) was used for testing.

[0088] XRD Test: The high-lithium-content glass-ceramics or chemically strengthened glass-ceramics of this application are crushed and ground into samples with a particle size less than 75 μm, and the ground samples are tested using an X-ray diffractometer to obtain the XRD diffraction peak curve and XRD diffraction data. The X-ray diffractometer used in this application is Shimadzu XRD-6100. The range of the incident angle for testing is 2θ = 10° - 50°, the scanning speed is 6° / min, the working voltage is 40 kV, and the working current is 30 mA.

[0089] Determination of Crystal Phase: The XRD diffraction data is analyzed using Jade software (JADE Standard 8.6) to determine the crystal phase in the sample.

[0090] Determination of Crystallinity: The test results (RAW format) of XRD are imported into the X-ray diffraction data Rietveld refinement software Jade for fitting and calculation to determine the crystallinity of the sample. Specifically, the ratio of the area of the fitted crystal phase peak to the area of all the fitted peaks is recorded as the crystallinity of the sample.

[0091] Determination of Average Crystal Size: Using the result data obtained from XRD testing, according to the Scherrer formula D = Kλ / (βcosθ), the average crystal size of the sample can be calculated. Here, λ is the X-ray wavelength, λ = 0.154056 nm, β is the full width at half maximum 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 subjected to curve fitting in Jade software, and Jade outputs a fitting report. According to the 2θ value and PeakFWHM value corresponding to each diffraction peak in the fitting report, the PeakFWHM value is converted to radian system: β = (FWHM / 180×3.14). After calculating the crystal size of each diffraction peak through the Scherrer formula D = Kλ / (βcosθ) and averaging them, the average crystal size in the sample is obtained.

[0092] Measurement of Transmittance and Optical b Value: 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 measure the transmittance and optical b value of the microcrystalline glass with high lithium content in this application. Specifically, a haze meter was used to measure the transmittance and optical b value of 5 pieces of microcrystalline glass of the same batch for light with different wavelengths. The average value of the optical b values measured for the 5 pieces of microcrystalline glass was recorded as the result of the optical b value of the microcrystalline glass. The average value of the transmittance measured for the 5 pieces of microcrystalline glass at a wavelength of 550 nm was recorded as the result of the transmittance of the microcrystalline glass at a wavelength of 550 nm. Among them, the haze meter used in this application test is the Konica Minolta Spectrophotometer CM-3600A from Japan. The light-receiving optical system is transmission, the spectral splitting method is a plane diffraction grating, the wavelength range is 360 nm - 740 nm, the wavelength interval is 10 nm, the illumination light source is a pulsed xenon lamp X4, the ambient temperature where the instrument is placed is 24 °C, and the air humidity is 40%.

[0093] Density: The density of the microcrystalline glass with high lithium content in this application was measured using an electronic density balance SD-200L from ALFAMIRAGE of Japan.

[0094] Refractive Index: The refractive index of the microcrystalline glass with high lithium content in this application was determined using an Abbe refractometer of type WYA-2WAJ.

[0095] Exchange Amount: It refers to the ratio of the mass difference of the microcrystalline glass with high lithium content before and after chemical strengthening to the mass of the microcrystalline glass with high lithium content before chemical strengthening.

[0096] Expansion Softening Point Temperature: The sample was made into a cylinder with a diameter of 5.5 mm and a length of 20 mm, and a thermal dilatometer LINSEIS L75VD1000 was used to test the sample. A test curve of the thermal expansion coefficient was output. The corresponding temperature when the curve began to show a downward trend as the temperature increased was the expansion softening point temperature of the sample.

[0097] Young's Modulus: The Young's modulus of the microcrystalline glass with high lithium content was measured by acoustic wave using a UMS-100 ultrasonic material characterization system.

[0098] Upper crystallization temperature: Break the substrate glass into small pieces, then put them into a long quartz groove and spread them evenly. Set the temperature range of the gradient furnace of model JKZC-XJY01, such as the temperature range of 1050°C - 1225°C, and take at least 6 temperature points from high to low for each temperature range. After the gradient furnace reaches the preset temperature range, put the long quartz groove with the sample into the gradient furnace, so that the 6 temperature points correspond to the glass samples at 6 positions in the long quartz groove respectively. Keep the long quartz groove in the gradient furnace at a constant temperature for 60 - 70 minutes, and then take out the long quartz groove. Observe the glass samples at different positions in the long quartz groove with a microscope and a magnifying glass. If the glass sample becomes devitrified or foggy, it is determined that the glass sample at that position crystallizes; if the glass sample is completely transparent, it is determined that the glass sample at that position does not crystallize. The upper crystallization temperature range is between the temperature points corresponding to the completely transparent samples and the temperature points corresponding to the adjacent devitrified or foggy samples, and the average value of the two temperature points is taken as the upper crystallization temperature. If all the glass samples in the long quartz groove crystallize or do not crystallize within the temperature range set by the gradient furnace, reset the temperature range of the gradient furnace and measure the upper crystallization temperature of the glass samples.

[0099] Average anti-sandpaper drop height test: For multiple chemically strengthened glass-ceramic samples in the same example or the same comparative example, the sum of the anti-sandpaper drop heights measured for each sample is divided by the number of samples measured, and the resulting value is recorded as the average anti-sandpaper drop height of the tested chemically strengthened glass-ceramic, which is used to characterize the anti-drop damage performance of the chemically strengthened glass-ceramic. At least 10 samples are taken for each batch of testing, and the average anti-sandpaper drop height

[0100] where n is the number of glass samples tested in each batch, and hi is the anti-sandpaper drop height measured for a single sample;

[0101] where the test method for the anti-sandpaper drop height of a single sample is as follows:

[0102] Step 1: Stick 80-mesh sandpaper on the lower surface of a 181g model machine, and place the model machine on a Green Map LT-SKDL-CD type drop tester;

[0103] Step 2: Place a chemical strengthened glass-ceramic sample to be tested with a length, width and thickness of 50 mm × 50 mm × 0.5 mm directly below the model machine, facing the sandpaper. Let the model machine impact and fall from a certain drop height on the chemical strengthened glass-ceramic sample directly below it. If the chemical strengthened glass-ceramic sample does not break, increase the drop height of the model machine regularly and let the model machine continue to impact and fall on the chemical strengthened glass-ceramic sample directly below it until the chemical strengthened glass-ceramic sample breaks. For example, the drop height of the model machine starts from 0.4 m, and a drop impact is carried out on the sample. If the sample does not break, the drop height of the model machine is increased by 0.1 m and dropped again. Repeat the above process until the chemical strengthened glass-ceramic sample breaks;

[0104] Step 3: Record the drop height of the previous drop before the chemical strengthened glass-ceramic sample breaks as its anti-sandpaper drop height. For example, if the drop height is increased by 0.1 m each time and the drop height when the sample breaks is 0.5 m, then the anti-sandpaper drop height of the sample is 0.4 m.

[0105] Without being limited to any theory, it is speculated that the chemical strengthening process of glass-ceramics generally undergoes the following two steps. One is the ion exchange that occurs at the interface where the glass-ceramic contacts the molten salt, and the ions with larger ionic radii in the molten salt enter the glass-ceramic. The other is the migration process of the large-radius ions exchanged into the glass-ceramic to deeper parts of the glass-ceramic. However, in the prior art, for glass-ceramics with a high lithium content and containing the main crystal phase of lithium disilicate, when chemically strengthened in a high-temperature salt bath (such as a salt bath temperature above 480 °C), the speed of surface ion exchange (such as the exchange of lithium ions Li + in the glass-ceramic with sodium ions Na + in the salt bath) is relatively fast, while the migration rate of the large-radius ions exchanged in is restricted by the internal structure of the glass-ceramic. In this case, the compressive stress generated on the surface layer of the glass-ceramic will quickly reach the bearing limit, which is likely to cause the phenomenon of "surface cracking" on the surface of the glass-ceramic. The "surface cracking" phenomenon mainly occurs on the first main surface and / or the second main surface of the glass-ceramic, and the crack does not penetrate the entire depth or thickness of the glass-ceramic.

[0106] Furthermore, when the chemical strengthening treatment is carried out at a higher temperature, in glass-ceramics with a high lithium content and containing the main crystal phase of lithium disilicate, the first main surface or / and the second main surface are even prone to the phenomenon of "peeling", that is, the outermost layer will directly peel off from the glass-ceramic, and the thickness of the peeled layer is usually from a few micrometers to dozens of micrometers.

[0107] The phenomena of "surface cracking" and / or surface "peeling" of the glass-ceramics during the chemical strengthening process are very harmful to the properties of the glass-ceramics themselves. They will not only cause the surface of the glass-ceramics to fail, but also greatly reduce the mechanical strength of the glass-ceramics, making them unable to meet the usage requirements.

[0108] In view of this, in the present application, a high-lithium-content glass-ceramics suitable for high-temperature chemical strengthening with lithium disilicate as the main crystal phase, a chemically strengthened glass-ceramics, and their applications are provided. After high-temperature chemical strengthening, the high-lithium-content glass-ceramics not only overcome the problems of "surface cracking" and / or surface "peeling", but also can obtain a chemically strengthened glass-ceramics with high stress performance. By using the high-lithium-content glass-ceramics for high-temperature chemical strengthening treatment to prepare a chemically strengthened glass-ceramics with high stress level and high mechanical strength performance, the efficiency of preparing high-strength chemically strengthened glass-ceramics can be greatly improved.

[0109] As described above, in some embodiments of the present application, a high-lithium-content glass-ceramics is provided. The high-lithium-content glass-ceramics contain a lithium disilicate crystal phase, and the lithium disilicate crystal phase has a higher weight percentage than other crystal phases present in the high-lithium-content glass-ceramics. In terms of the molar percentage of oxides, the composition of the high-lithium-content glass-ceramics includes: SiO2: 41.00 mol%-69.50 mol%, Al2O3: 0.00 mol%-2.00 mol%, P2O5: 1.50 mol%-3.00 mol%, ZrO2: 2.00 mol%-6.00 mol%, MgO: 0.00 mol%-2.00 mol%, ZnO: 0.00 mol%-2.00 mol%, Na2O: 0.00 mol%-3.00 mol%, K2O: 0.00 mol%-1.00 mol%, Li2O: 27.00 mol%-32.00 mol%, CaO: 0.00 mol%-5.00 mol%, B2O3: 0.00 mol%-1.00 mol%, SrO: 0.00 mol%-2.00 mol%. In terms of the content represented by the molar percentage of each oxide in the composition of the high-lithium-content glass-ceramics, the composition of the high-lithium-content glass-ceramics satisfies: 0.20 ≤ 2.25×Li2O - 8×ZrO2 - 0.2×CaO ≤ 0.41.

[0110] In the present application, by optimizing the glass formula, for example, at a relatively high lithium content, adopting a relatively high zirconium content and a relatively low aluminum content, etc., and at the same time making the content relationship between the components meet specific requirements, enabling the components to 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 spodumene crystal phase), thereby helping to ensure the obtained glass-ceramics with high intrinsic strength and excellent optical properties and having lithium disilicate as the main crystal phase. On the other hand, it is beneficial to ensure that the glass-ceramics meet specific compositions and structures, thus ensuring that it can achieve high-temperature chemical strengthening and ensuring that there will be no "surface cracking" and / or surface "peeling" problems during the high-temperature chemical strengthening process, which further helps to improve its chemical strengthening efficiency and can ensure that the prepared chemically strengthened glass-ceramics have a high stress level (such as having a high CS_50, |CT_AV|, DOL_0, etc.) and high mechanical strength properties.

[0111] In some embodiments, the value of 2.25×Li2O - 8×ZrO2 - 0.2×CaO can be, for example, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40 or 0.41, or can be a value within the numerical range formed by any two of the above specific values as endpoints, as long as it can obtain the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as it can obtain the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application.

[0112] In the glass system of the present application, SiO2 is a network-forming oxide of the glass network and is an indispensable component for constructing the glass network structure. Appropriately increasing the content of SiO2 can increase the structural stability and mechanical strength of the glass, but excessive SiO2 will increase the viscosity of the base glass, making the glass melting difficult and thus reducing the formability of the base glass. Therefore, the molar percentage of SiO2 is controlled at 41.00 mol% - 69.50 mol%, preferably, the molar percentage of SiO2 is in the range of 60.00 mol% - 65.00 mol%, and more preferably in the range of 61.00 mol% - 64.00 mol%.

[0113] In some embodiments, the high-lithium-content glass-ceramics may contain 41.00 mol% - 69.50 mol%, 42.00 mol% - 69.00 mol%, 50.00 mol% - 68.00 mol%, 55.00 mol% - 66.00 mol%, 60.00 mol% - 69.00 mol%, 60.00 mol% - 65.00 mol%, 61.00 mol% - 69.00 mol%, 61.00 mol% - 64.00 mol%, 62.00 mol% - 64.00 mol%, 63.00 mol% - 64.00 mol%, 61.00 mol% - 63.50 mol% or 63.00 mol% - 69.50 mol% of SiO2. In some embodiments, the high-lithium-content glass-ceramics may contain 41.00 mol%, 42.00 mol%, 43.00 mol%, 44.00 mol%, 45.00 mol%, 46.00 mol%, 47.00 mol%, 50.00 mol%, 53.00 mol%, 55.00 mol%, 58.00 mol%, 60.00 mol%, 61.00 mol%, 62.00 mol%, 63.00 mol%, 63.50 mol%, 64.00 mol%, 65.00 mol% or 69.50 mol% of SiO2, or SiO2 within the numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of this application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of this application can be obtained.

[0114] In the glass system of this application, Al2O3 is an optional component. The addition of an appropriate amount of Al2O3 helps to promote the ion exchange during chemical strengthening to a certain extent. However, excessive Al2O3 will cause an increase in the glass viscosity and is likely to lead to the precipitation of other crystal phases, such as spodumene, etc., affecting the crystal phase structure of the glass-ceramics. Therefore, the molar percentage of Al2O3 is controlled within 0.00 mol% - 2.00 mol%.

[0115] In some embodiments, the high-lithium-content glass-ceramics may contain 0.00 mol%-2.00 mol%, 0.00 mol%-1.60 mol%, 0.00 mol%-1.00 mol%, 0.50 mol%-1.60 mol%, 0.50 mol%-1.00 mol%, 0.00 mol%-0.50 mol%, 1.20 mol%-1.60 mol%, 0.00 mol%-1.30 mol%, 0.00 mol%-1.20 mol% or 1.00 mol%-2.00 mol% of Al2O3. In some embodiments, the high-lithium-content glass-ceramics 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% or 2.00 mol% of Al2O3, or Al2O3 within the numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application can be obtained.

[0116] In the glass system of the present application, P2O5 is an essential part as a nucleating agent. When its content is too low or too high, the crystallization effect will be poor, affecting the optical properties of the obtained glass-ceramics. For example, it will cause the transparency of the glass-ceramics to decrease. Therefore, the molar percentage of P2O5 is controlled at 1.50 mol%-3.00 mol%, preferably 1.50 mol%-2.10 mol%.

[0117] In some embodiments, the high-lithium-content glass-ceramics may contain 1.50 mol% - 3.00 mol%, 1.60 mol% - 2.80 mol%, 1.50 mol% - 2.50 mol%, 1.60 mol% - 2.10 mol%, 1.70 mol% - 2.20 mol%, 1.50 mol% - 1.60 mol%, 1.70 mol% - 3.00 mol%, 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% - 2.10 mol% of P2O5. In some embodiments, the high-lithium-content glass-ceramics may contain 1.50 mol%, 1.60 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% or 3.00 mol% of P2O5, or P2O5 within the numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of this application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of this application can be obtained.

[0118] In the glass system of this application, ZrO2 is an intermediate oxide for glass formation. An appropriate amount of ZrO2 can improve the chemical stability of the glass, increase the hardness of the glass, as well as the scratch and drop resistance of the glass. At the same time, due to the high cation charge and strong field strength of ZrO2, it has a large agglomeration effect on the glass structure and is also commonly used as a nucleating agent in glass-ceramics. In this application, using a certain amount of ZrO2 is not only beneficial for the glass-ceramics to obtain higher stress after chemical strengthening, but also beneficial for the glass-ceramics to resist "surface cracking" during the strengthening process. However, too high a content of ZrO2 will lead to glass phase separation or is not conducive to obtaining glass-ceramics with excellent optical properties. Therefore, the molar percentage of ZrO2 is controlled at 2.00 mol% - 6.00 mol%, preferably 3.00 mol% - 6.00 mol%.

[0119] In some embodiments, the high-lithium-content glass-ceramics may contain 2.00 mol% - 6.00 mol%, 2.30 mol% - 5.80 mol%, 2.50 mol% - 5.50 mol%, 2.80 mol% - 5.30 mol%, 2.90 mol% - 5.10 mol%, 3.00 mol% - 5.50 mol%, 3.10 mol% - 4.80 mol%, 4.80 mol% - 6.00 mol%, 4.00 mol% - 5.80 mol%, 3.20 mol% - 5.30 mol%, 3.50 mol% - 5.00 mol%, 3.50 mol% - 6.00 mol%, 3.50 mol% - 5.80 mol%, 4.00 mol% - 5.00 mol% or 3.00 mol% - 6.00 mol% of ZrO₂. In some embodiments, the high-lithium-content glass-ceramics may contain 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% or 6.00 mol% of ZrO₂, or ZrO₂ within the numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application can be obtained.

[0120] In the glass system of the present application, CaO is an optional component of the network modifier oxide for glass formation. An appropriate amount of CaO helps to reduce the high-temperature viscosity of the glass and increase the density of the glass. However, an excessive amount of CaO will shorten the glass melting time and increase the brittleness. In the present application, appropriately adding a small amount of CaO helps to increase the stress obtained after the chemical strengthening of the glass-ceramics and also slows down the chemical strengthening rate of the glass-ceramics. Therefore, the molar percentage of CaO is controlled at 0.00 mol% - 5.00 mol%, preferably 0.00 mol% - 4.00 mol%.

[0121] In some embodiments, the high-lithium-content glass-ceramics may contain 0.00 mol%-5.00 mol%, 0.10 mol%-4.00 mol%, 0.00 mol%-4.00 mol%, 0.50 mol%-3.80 mol%, 0.80 mol%-2.00 mol%, 0.00 mol%-1.60 mol%, 0.00 mol%-1.00 mol%, 1.50 mol%-4.00 mol%, 0.00 mol%-2.00 mol%, 1.00 mol%-4.00 mol% or 0.10 mol%-5.00 mol% of CaO. In some embodiments, the high-lithium-content glass-ceramics 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%, 3.00 mol%, 4.00 mol% or 5.00 mol% of CaO, or CaO within the numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of this application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of this application can be obtained.

[0122] In the glass system of this application, Li2O, as an essential component, is a network modifier oxide for glass formation. It can not only improve the viscosity of the glass, promote the melting and clarification of the glass melt, but also be one of the main components for forming 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 in chemically strengthened glass-ceramics. However, excessive Li2O will deteriorate the optical properties of the glass-ceramics and easily cause the phenomenon of "surface cracking" during the strengthening process. Therefore, the molar percentage of Li2O is controlled at 27.00 mol%-32.00 mol%, preferably 27.00 mol%-30.00 mol%.

[0123] In some embodiments, the high-lithium-content glass-ceramics may contain 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% - 32.00 mol%, 28.50 mol% - 31.00 mol%, 29.00 mol% - 30.50 mol%, 28.00 mol% - 30.50 mol% or 29.50 mol% - 32.00 mol% of Li2O. In some embodiments, the high-lithium-content 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% or 32.00 mol% of Li2O, or Li2O within the numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application can be obtained.

[0124] In the glass system of the present application, MgO is an optional component. An appropriate amount of MgO can play a role in adjusting the glass-phase composition in the glass-ceramics. However, excessive MgO will affect the crystal growth and the crystal-phase structure of the glass-ceramics. Therefore, the molar percentage of MgO is controlled within 0.00 mol% - 2.00 mol%.

[0125] In some embodiments, the high-lithium-content glass-ceramics may contain 0.00 mol% - 2.00 mol%, 0.00 mol% - 1.60 mol%, 0.50 mol% - 1.60 mol%, 0.80 mol% - 1.50 mol%, 0.00 mol% - 1.00 mol%, 0.00 mol% - 0.50 mol%, 0.10 mol% - 1.10 mol%, 0.10 mol% - 1.50 mol% or 0.00 mol% - 1.40 mol% of MgO. In some embodiments, the high-lithium-content glass-ceramics 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% or 2.00 mol% of MgO, or MgO within the numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application can be obtained.

[0126] In the glass system of the present application, ZnO is an optional component as a network intermediate. An appropriate amount of ZnO can combine with free oxygen, adjust the glass structure, and can remain in the glass phase of the glass-ceramics to increase the glass viscosity. However, excessive ZnO will affect the crystal growth and the crystal phase structure of the glass-ceramics. Therefore, the molar percentage of ZnO is controlled at 0.00 mol% - 2.00 mol%.

[0127] In some embodiments, in the high-lithium-content glass-ceramics, ZnO may be included in an amount of 0.00 mol% - 2.00 mol%, 0.00 mol% - 1.70 mol%, 0.50 mol% - 1.60 mol%, 0.80 mol% - 1.50 mol%, 0.00 mol% - 1.00 mol%, 0.00 mol% - 0.50 mol%, 0.10 mol% - 1.10 mol%, 0.10 mol% - 1.50 mol%, or 0.00 mol% - 1.40 mol%. In some embodiments, in the high-lithium-content glass-ceramics, ZnO may be included in an amount of 0.00 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.80 mol%, or 2.00 mol%, or ZnO within a numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application can be obtained.

[0128] In the glass system of the present application, Na2O is an optional component and is a network modifier oxide. An appropriate amount of Na2O can provide free oxygen, improve the viscosity of the glass, promote the melting and clarification of the glass melt, and at the same time can also regulate the chemical strengthening rate. However, excessive Na2O will not only reduce the crystallinity of the glass-ceramics but also affect the chemical strengthening effect. Therefore, the molar percentage of Na2O is controlled within 0.00 mol% - 3.00 mol%.

[0129] In some embodiments, in the high-lithium-content glass-ceramics, Na2O may be included in an amount of 0.00 mol% - 3.00 mol%, 0.00 mol% - 2.80 mol%, 0.00 mol% - 1.00 mol%, 0.10 mol% - 2.70 mol%, 0.50 mol% - 1.60 mol%, 0.60 mol% - 1.00 mol%, 2.50 mol% - 3.00 mol% or 0.00 mol% - 0.50 mol%. In some embodiments, in the high-lithium-content glass-ceramics, Na2O may be included in an amount of 0.00 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.80 mol%, 2.00 mol%, 2.50 mol% or 3.00 mol%, or Na2O within the numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application can be obtained.

[0130] In the glass system of the present application, K2O is an external oxide of the glass network and is an optional component. An appropriate amount of K2O can provide free oxygen, increasing the oxygen-silicon ratio in the glass structure. However, too much K2O will affect the network structure of the glass, affecting the optical properties, thermal stability, chemical stability, mechanical strength and weather resistance of the glass. Therefore, the molar percentage of K2O is controlled within 0.00 mol% - 1.00 mol%.

[0131] In some embodiments, the high-lithium content 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 high-lithium content glass-ceramics may contain 0.00 mol%, 0.15 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol% or 1.00 mol% of K2O, or K2O within the numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium content 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 range, as long as the high-lithium content glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained.

[0132] In the glass system of the present application, B2O3 is an optional component. An appropriate amount of B2O3 can be used as a flux and / or softening agent, which helps to improve the forming and hot bending effects of the glass. However, excessive B2O3 will lead to uncontrollable crystallization and poor optical properties of the glass-ceramics. Therefore, the molar percentage of B2O3 is controlled within 0.00 mol%-1.00 mol%.

[0133] In some embodiments, the high-lithium content 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% of B2O3. In some embodiments, the high-lithium content glass-ceramics may contain 0.00 mol%, 0.10 mol%, 0.25 mol%, 0.50 mol%, 0.60 mol%, 0.70 mol%, 0.75 mol%, 0.85 mol%, 0.95 mol% or 1.00 mol% of B2O3, or B2O3 within the numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium content 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 range, as long as the high-lithium content glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained.

[0134] In the glass system of the present application, SrO is an optional component and is an alkaline earth metal oxide. An appropriate amount of SrO can play a role in adjusting the composition of the glass phase in the glass-ceramics, helping to increase the density of the glass-ceramics and its Young's modulus. At the same time, it is also beneficial to reduce the expansion softening point of the glass-ceramics, and thus facilitate the thermoforming of the glass-ceramics into 3D curved glass-ceramics. However, an excessive amount of SrO will deteriorate the optical properties of the glass-ceramics. Therefore, the molar percentage of SrO is controlled at 0.00 mol% - 2.00 mol%.

[0135] In some embodiments, in the high-lithium-content glass-ceramics, SrO may be included in an amount of 0.00 mol% - 2.00 mol%, 0.10 mol% - 2.00 mol%, 0.00 mol% - 1.00 mol%, 0.10 mol% - 1.00 mol%, 0.30 mol% - 1.90 mol%, 0.40 mol% - 1.20 mol%, 1.20 mol% - 2.00 mol%, 0.00 mol% - 0.30 mol%, 0.85 mol% - 1.40 mol%, 0.85 mol% - 1.90 mol%, 0.50 mol% - 1.20 mol% or 1.00 mol% - 2.00 mol%. In some embodiments, in the high-lithium-content glass-ceramics, SrO may be included in an amount of 0.00 mol%, 0.30 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.80 mol% or 2.00 mol%, or SrO within the numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of the present application can be obtained.

[0136] In some embodiments, based on the molar percentage of oxides, the composition of the high-lithium-content glass-ceramics includes: SiO2: 60.00 mol% - 65.00 mol%, Al2O3: 0.00 mol% - 2.00 mol%, P2O5: 1.50 mol% - 3.00 mol%, ZrO2: 2.00 mol% - 6.00 mol%, MgO: 0.00 mol% - 2.00 mol%, ZnO: 0.00 mol% - 2.00 mol%, Na2O: 0.00 mol% - 3.00 mol%, K2O: 0.00 mol% - 1.00 mol%, Li2O: 27.00 mol% - 32.00 mol%, CaO: 0.00 mol% - 4.00 mol%, B2O3: 0.00 mol% - 1.00 mol%, SrO: 0.00 mol% - 2.00 mol%. By making the glass-ceramics meet the above composition, it is not only beneficial to endow the high-lithium-content glass-ceramics with a main crystal phase of lithium disilicate with high intrinsic strength and excellent optical properties, but also beneficial to ensuring its chemical strengthening effect, ensuring that the glass-ceramics obtain a high stress level after chemical strengthening, and thus obtaining high mechanical strength performance and anti-damage performance.

[0137] In some embodiments, on the basis of the above composition range, the composition of the high-lithium-content glass-ceramics described in the present application may further include other components. For example, in some specific embodiments, based on the molar percentage of oxides, the composition of the high-lithium-content glass-ceramics further includes: Y2O3: 0.00 mol% - 1.00 mol%, La2O3: 0.00 mol% - 1.00 mol%, Ta2O5: 0.00 mol% - 1.00 mol%.

[0138] In the glass system of the present application, the selective addition of an appropriate amount of Y2O3, La2O3 or Ta2O5 helps to increase the density of the glass-ceramics and increase its Young's modulus, but at the same time, it may also increase the refractive index of the glass-ceramics and reduce the optical properties of the glass-ceramics. Therefore, the molar percentage of Y2O3, La2O3 or Ta2O5 is controlled within 0.00 mol% - 1.00 mol%.

[0139] In some embodiments, in the high-lithium-content glass-ceramics, the molar percentages of Y2O3, La2O3, or Ta2O5 can be 0.00 mol%, 0.10 mol%, 0.20 mol%, 0.30 mol%, 0.40 mol%, 0.50 mol%, 0.60 mol%, 0.70 mol%, 0.80 mol%, 0.85 mol%, 0.90 mol%, 0.95 mol%, or 1.00 mol%, or values within the numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of this application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required properties of this application can be obtained.

[0140] In some embodiments, in terms of the molar percentages of oxides, the composition of the high-lithium-content glass-ceramics includes: SiO2: 60.00 mol% - 65.00 mol%, Al2O3: 0.00 mol% - 2.00 mol%, P2O5: 1.50 mol% - 2.50 mol%, ZrO2: 3.00 mol% - 6.00 mol%, MgO: 0.00 mol% - 2.00 mol%, ZnO: 0.00 mol% - 2.00 mol%, Na2O: 0.00 mol% - 3.00 mol%, K2O: 0.00 mol% - 1.00 mol%, Li2O: 27.50 mol% - 31.00 mol%, CaO: 0.00 mol% - 2.50 mol%, B2O3: 0.00 mol% - 1.00 mol%, SrO: 0.00 mol% - 2.00 mol%, Y2O3: 0.00 mol% - 1.00 mol%, La2O3: 0.00 mol% - 1.00 mol%, Ta2O5: 0.00 mol% - 1.00 mol%. By making the high-lithium-content glass-ceramics meet the above composition, it is more conducive to preparing chemically strengthened glass-ceramics with a higher stress level, and thus conducive to ensuring that the prepared chemically strengthened glass-ceramics have high mechanical strength properties and excellent anti-damage properties.

[0141] In some embodiments of the present application, based on the content expressed as the molar percentage of each oxide in the high-lithium-content glass-ceramic composition, the composition of the high-lithium-content glass-ceramic further satisfies: 0.25 ≤ (2.2×ZrO₂ + 0.35×CaO + Na₂O) / Li₂O ≤ 0.45. By making the composition of the glass-ceramic satisfy this relational expression, it is beneficial to ensure that the high-lithium-content glass-ceramic has high intrinsic strength and excellent optical properties, while avoiding the phenomena of "surface cracking" and / or "peeling" during chemical strengthening of the glass-ceramic in a high-temperature molten salt bath. In some embodiments, the value of (2.2×ZrO₂ + 0.35×CaO + Na₂O) / Li₂O can be, for example, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44 or 0.45, or can be a value within the numerical range formed by any two of the above specific numerical values as endpoints, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0142] In some embodiments of the present application, based on the content expressed as the molar percentage of each oxide in the high-lithium-content glass-ceramic composition, the composition of the high-lithium-content glass-ceramic further satisfies: 0.00 ≤ (CaO + MgO + ZnO + Na₂O + K₂O) / (ZrO₂ + Li₂O) ≤ 0.15. Adopting a composition and structure that satisfy this relational expression will be more beneficial to improving the stress level generated after chemical strengthening of the high-lithium-content glass-ceramic. In some embodiments, the value of (CaO + MgO + ZnO + Na₂O + K₂O) / (ZrO₂ + Li₂O) can be, for example, 0.00, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, 0.14 or 0.15, or can be a value within the numerical range formed by any two of the above specific numerical values as endpoints, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0143] In some embodiments of the present application, in terms of the content expressed by the molar percentage of each oxide in the high-lithium-content glass-ceramic composition, the composition of the high-lithium-content glass-ceramic further satisfies: 0.90 ≤ SiO2 + Li2O ≤ 0.95. By adopting the composition and structure that satisfy this relationship, it is beneficial to ensure the precipitation of the desired content of lithium disilicate crystals in the glass-ceramic, and can effectively reduce the precipitation of other crystals, such as spodumene crystals, which is conducive to ensuring that the glass-ceramic obtains high intrinsic strength and optical properties, and is also conducive to obtaining a high stress level after chemical strengthening of the glass-ceramic. At the same time, it is also beneficial to ensure that the base glass does not devitrify during the heat treatment to prepare the glass-ceramic, or to ensure that the base glass does not devitrify 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 or 0.950, or can be a value within the numerical range formed by any two of the above specific values as endpoints, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0144] In some embodiments of the present application, in terms of the content expressed by the molar percentage of each oxide in the high-lithium-content glass-ceramic composition, the composition of the high-lithium-content glass-ceramic further satisfies: 2.00 ≤ SiO2 / Li2O ≤ 2.30. By adopting the composition and structure that satisfy this relationship, it is beneficial to reduce the crystal size of the glass-ceramic and improve the optical properties of the glass-ceramic; at the same time, it is beneficial to ensure the precipitation of the main crystal phase of lithium disilicate crystals and can effectively reduce the precipitation of other crystal phases, such as spodumene crystals, which is conducive to ensuring that the glass-ceramic obtains high intrinsic strength and is also conducive to obtaining a high stress level after chemical strengthening of the glass-ceramic. In some embodiments, the value of SiO2 / Li2O can be, for example, 2.00, 2.02, 2.04, 2.06, 2.08, 2.10, 2.12, 2.14, 2.16, 2.18, 2.20, 2.22, 2.24, 2.26, 2.28 or 2.30, or can be a value within the numerical range formed by any two of the above specific values as endpoints, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0145] In some embodiments of the present application, in terms of the content expressed as the molar percentage of each oxide in the high-lithium-content glass-ceramic composition, the composition of the high-lithium-content glass-ceramic further satisfies: 0 ≤ (CaO + SrO) / ZrO2 ≤ 1.50. By adopting the composition and structure that satisfy this relational expression, it is more conducive to enhancing the stress level generated after chemical strengthening of the high-lithium-content glass-ceramic. In some embodiments, the value of (CaO + SrO) / ZrO2 can be, for example, 0.00, 0.10, 0.20, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.00, 1.20, 1.30, 1.40, or 1.50, or can be a value within the numerical range formed by any two of the above specific numerical values as endpoints, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0146] In some embodiments of the present application, in terms of the content expressed as the molar percentage of each oxide in the high-lithium-content glass-ceramic composition, the composition of the high-lithium-content glass-ceramic further satisfies: 0 ≤ Al2O3 / (SiO2 + Al2O3) ≤ 0.03. By adopting the composition and structure that satisfy this relational expression, it is more conducive to ensuring the precipitation of the main crystal phase, lithium disilicate crystals, and can effectively reduce the precipitation of other crystal phases, such as spodumene crystals, which is beneficial to ensuring that the glass-ceramic obtains high intrinsic strength and optical properties, and is also beneficial to enabling the glass-ceramic to obtain a high stress level after chemical strengthening. In some embodiments, the value of Al2O3 / (SiO2 + Al2O3) can be, for example, 0.00, 0.01, 0.020, 0.022, 0.023, 0.024, 0.025, or 0.03, or can be a value within the numerical range formed by any two of the above specific numerical values as endpoints, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0147] In some embodiments, in terms of the content expressed as the molar percentage of each oxide in the high-lithium-content glass-ceramic composition, the composition of the high-lithium-content glass-ceramic satisfies:

[0148] 0 ≤ (CaO + MgO + ZnO + Na2O + K2O) / (ZrO2 + Li2O) ≤ 0.10; and / or,

[0149] 0.90 ≤ SiO2 + Li2O ≤ 0.93; and / or,

[0150] 0 ≤ (CaO + SrO) / ZrO2 ≤ 1.00, preferably 0 ≤ (CaO + SrO) / ZrO2 ≤ 0.70. By making the composition satisfy at least one of the above relationships, it is beneficial to further improve the structure of the glass, and it is more beneficial to prepare chemically strengthened glass-ceramics with a higher stress level, and then it is beneficial to ensure that the prepared chemically strengthened glass-ceramics have high mechanical strength properties and excellent anti-damage properties.

[0151] The glass-ceramics with high lithium content of the present application have a specific composition and structure and can achieve high-temperature chemical strengthening. When they are chemically strengthened in a high-temperature molten salt bath, "surface cracking" and / or "peeling" phenomena will not occur. In some embodiments of the present application, in a mixed salt bath at 500 °C, after being treated for 1 h - 5 h, in the X-ray diffraction pattern of the glass-ceramics with high lithium content, there is no diffraction peak in the range of 2θ of 35.30° - 35.90°; wherein, the mixed salt bath includes 29.99 wt% NaNO3, 69.98 wt% KNO3, and 0.03 wt% LiNO3.

[0152] It should be noted that after the aforementioned treatment for 1 h - 5 h, the fact that there is no diffraction peak in the X-ray diffraction pattern of the glass-ceramics with high lithium content in the range of 2θ of 35.30° - 35.90° means that at any time between 1 h - 5 h of treatment, there is no diffraction peak in the X-ray diffraction pattern in the range of 2θ of 35.30° - 35.90°.

[0153] In some embodiments of the present application, the density ρ of the glass-ceramics with high lithium content ≥ 2.54 g / cm 3 , and the refractive index ≤ 1.60. The glass-ceramics with high lithium content that satisfy this density and refractive index can ensure high intrinsic strength and excellent optical properties.

[0154] In some embodiments, the density ρ of the glass-ceramics with high lithium content can be 2.54 g / cm 3 , 2.55 g / cm 3 , 2.56 g / cm 3 , 2.57 g / cm 3 , 2.58 g / cm 3 , 2.59 g / cm 3 , 2.60 g / cm 3 , 2.61 g / cm 3 , 2.62 g / cm 3 , 2.63 g / cm 3 , 2.64 g / cm 3 or 2.65 g / cm 3, or a value greater than any of the above specific values, or a value within the numerical range formed by any two of the above specific values as endpoints, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0155] In some embodiments, the refractive index of the high-lithium-content glass-ceramic 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 less than any of the above specific values, or a value within the numerical range formed by any two of the above specific values as endpoints, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0156] In some embodiments of the present application, at a thickness of 0.5 mm, the b value of the high-lithium-content glass-ceramic is ≤ 1.0, preferably the b value is ≤ 0.8. The high-lithium-content glass-ceramic that satisfies this optical b value can ensure better optical performance and display effect, and is suitable for use in display screens with requirements for display effect. In some embodiments, at a thickness of 0.5 mm, the b value of the high-lithium-content glass-ceramic can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1.0, or a value less than any of the above specific values, or a value within the numerical range formed by any two of the above specific values as endpoints, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a high-lithium-content glass-ceramic or chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0157] In some embodiments of the present application, the high-lithium-content glass-ceramic is transparent in the visible light range, and / or, at a thickness of 0.5 mm, for light with a wavelength of 550 nm, the transmittance of the high-lithium-content glass-ceramic is ≥ 85.00%, preferably the transmittance is ≥ 90.00%. The high-lithium-content glass-ceramic that satisfies this transmittance can ensure better light transmittance and better transparency effect, and is suitable for use in display screens with requirements for display effect. The "visible light range" here refers to light in the 360 nm - 740 nm band.

[0158] In some embodiments, at a thickness of 0.5 mm and for light with a wavelength of 550 nm, the transmittance of the high-lithium-content glass-ceramics can be 85.00%, 86.00%, 87.00%, 88.00%, 89.00%, 90.00%, 90.50%, 91.00% or 92.00%, or a value within the numerical range formed by any two of the above specific values as endpoints, as long as high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required performance of this application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required performance of this application can be obtained.

[0159] The high-lithium-content glass-ceramics of this application have a relatively high transmittance and a low b value, both of which indicate that the high-lithium-content glass-ceramics of this application have excellent optical properties and good uniformity, are in a transparent state, and can meet the application requirements of cover glass for electronic devices.

[0160] In some embodiments of this application, the crystallinity of the high-lithium-content glass-ceramics is 30.00 wt% - 90.00 wt%, and the preferred crystallinity is 50.00 wt% - 90.00 wt%. The "crystallinity of the glass-ceramics" here refers to the percentage of the content of all crystalline phases or crystals in the glass-ceramics in the mass of the glass-ceramics. A relatively high content of crystalline phases is beneficial to improving the mechanical strength performance of the glass-ceramics. In some embodiments, the crystallinity of the high-lithium-content glass-ceramics can be 30.00 wt% - 90.00 wt%, 45.00 wt% - 85.00 wt%, 50.00 wt% - 90.00 wt%, 55.00 wt% - 85.00 wt%, 60.00 wt% - 85.00 wt%, 65.00 wt% - 90.00 wt%, 70.00 wt% - 90.00 wt% or 68.00 wt% - 85.00 wt%. In some embodiments, the crystallinity of the high-lithium-content glass-ceramics can be 30.00 wt%, 35.00 wt%, 40.00 wt%, 45.00 wt%, 50.00 wt%, 55.00 wt%, 60.00 wt%, 65.00 wt%, 70.00 wt%, 75.00 wt%, 80.00 wt%, 85.00 wt% or 90.00 wt%, or a value within the numerical range formed by any two of the above specific values as endpoints, as long as high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required performance of this application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required performance of this application can be obtained.

[0161] In some embodiments of the present application, expressions such as "the main crystal phase is lithium disilicate" or "the lithium disilicate crystal phase has a higher weight percentage than other crystal phases present in the lithium-rich microcrystalline glass" mean that the lithium disilicate crystal phase accounts for more than 70 weight percent (wt%) of all the crystal phases of the microcrystalline glass according to the embodiments of the present application.

[0162] In some embodiments of the present application, non-limiting examples of other possible crystal phases in the lithium-rich microcrystalline glass include: spodumene crystal phase, and / or, lithium phosphate crystal phase. In some embodiments, the lithium-rich microcrystalline glass further contains a spodumene crystal phase, preferably the weight percentage of the spodumene crystal phase in the microcrystalline glass is ≤20%, more preferably, the weight percentage of the spodumene crystal phase in the microcrystalline glass can be ≤15%, ≤10%, or ≤5%.

[0163] In some embodiments of the present application, in the lithium-rich microcrystalline glass, the average crystal size ≤100 nm, preferably the average crystal size ≤50 nm, more preferably the average crystal size is 15 nm - 45 nm. Meeting a smaller average crystal size is beneficial to ensuring the excellent optical properties of the microcrystalline glass. In some embodiments, the average crystal size can be 10 nm - 100 nm, 20 nm - 90 nm, 30 nm - 80 nm, 40 nm - 60 nm, 10 nm - 30 nm, 10 nm - 20 nm, 5 nm - 35 nm, or 15 nm - 35 nm. In some embodiments, the average crystal size can be 10 nm, 15 nm, 20 nm, 30 nm, 40 nm, 45 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, or 100 nm, or a value within the numerical range formed by any two of the above specific values as endpoints, as long as a lithium-rich microcrystalline glass or chemically strengthened microcrystalline glass with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range as long as a lithium-rich microcrystalline glass or chemically strengthened microcrystalline glass with the required performance of the present application can be obtained.

[0164] In some embodiments of the present application, the upper crystallization temperature of the base glass corresponding to the lithium-rich microcrystalline glass is in the range of 1000 °C - 1100 °C. Meeting this upper crystallization temperature range is beneficial to realizing the industrial mass production of the lithium-rich microcrystalline glass.

[0165] In some embodiments of the present application, the Young's modulus of the high-lithium-content glass-ceramics is ≥100.00 GPa. Preferably, the Young's modulus of the high-lithium-content glass-ceramics is ≥110.00 GPa. More preferably, the Young's modulus of the high-lithium-content glass-ceramics is 114 GPa - 130 GPa. A relatively high Young's modulus indicates that the high-lithium-content glass-ceramics have a relatively high intrinsic strength, which is beneficial for obtaining relatively high mechanical strength properties. In some embodiments, the Young's modulus of the high-lithium-content glass-ceramics can be 100.00 GPa - 150.00 GPa, 105.00 GPa - 140.00 GPa, 110.00 GPa - 130.00 GPa, or 114.00 GPa - 125.00 GPa. In some embodiments, the Young's modulus of the high-lithium-content glass-ceramics can be 100.00 GPa, 105.00 GPa, 110.00 GPa, 114 GPa, 115.00 GPa, 120.00 GPa, 125.00 GPa, 130.00 GPa, 140.00 GPa, or 150.00 GPa, or a value within the numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium-content 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 range, as long as the high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with the required performance of the present application can be obtained.

[0166] In some embodiments of the present application, the softening point of thermal expansion of the high-lithium-content glass-ceramics is 750°C - 820°C. An appropriate softening point of thermal expansion is beneficial for the 3D thermoforming of the high-lithium-content glass-ceramics to produce 3D curved glass-ceramics with high strength properties. In some embodiments, the softening point of thermal expansion of the high-lithium-content glass-ceramics can be 750°C, 760°C, 770°C, 780°C, 790°C, 800°C, 810°C, or 820°C, or a value within the numerical range formed by any two of the above specific values as endpoints, as long as the high-lithium-content glass-ceramics with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the high-lithium-content glass-ceramics with the required performance of the present application can be obtained.

[0167] In the present application, after the high-lithium-content glass-ceramics are subjected to thermoforming treatment, 3D curved glass-ceramics can be prepared. 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 high-lithium-content glass-ceramics.

[0168] The high-lithium-content glass-ceramics of the present application can be prepared by subjecting a base glass to heat treatment. In terms of molar percentage of oxides, the composition of the base glass used is the same as or substantially the same as that of the high-lithium-content glass-ceramics.

[0169] In the present application, the base glass can be prepared by using the forming methods in the prior art, and the present application has no restrictions thereon. For example, the forming methods can include, but are not limited to, float method, overflow method, rolling method, casting method, etc. Exemplarily, the raw material substances and the fining agent can be mixed evenly (the evenness is above 98%), and after melting and forming, annealing is carried out to obtain the base glass. Further, the process parameters can include: the melting temperature is 1480°C - 1680°C, the annealing temperature is 450°C - 650°C, and the holding time at the annealing temperature is 10h - 48h. Further, the fining agent can include, but is not limited to, one or more of sodium chloride, tin oxide, antimony oxide, arsenic oxide, etc., and the addition amount of the fining agent can be 0 - 1wt% of the total amount of the raw material substances.

[0170] In the present application, when the base glass is heat-treated to prepare the high-lithium-content glass-ceramics, the heat treatment can be carried out, for example, in an annealing furnace, and the heat treatment methods can include, but are not limited to, one-step heat treatment, two-step heat treatment or multi-step heat treatment. For example, it can include two-step heat treatment of nucleation treatment first and then crystallization treatment. The process conditions of the heat treatment can include, but are not limited to: the nucleation temperature can be 500°C - 600°C, and the nucleation holding time can be 120min - 360min; the crystallization temperature can be 600°C - 800°C, and the crystallization holding time can be 60min - 180min; the heating rate of the whole process can be 5°C / min - 20°C / min, and the cooling rate can be 0.1°C / min - 3°C / min. After the heat treatment, those skilled in the art can also carry out other conventional steps to obtain a high-lithium-content glass-ceramics sample that meets the required specifications or requirements, such as cutting treatment, CNC machining treatment (computer numerical control, i.e., numerically controlled machine tool) or polishing treatment and other steps.

[0171] In the present application, a chemically strengthened glass-ceramics is also provided. Among them, the composition at the center of the chemically strengthened glass-ceramics is the same as that of the high-lithium-content glass-ceramics described above. The chemically strengthened glass-ceramics includes a region of compressive stress layer extending from the surface of the chemically strengthened glass-ceramics to the compression depth, and has a tensile stress inside the chemically strengthened glass-ceramics.

[0172] It should be understood that, compared with the glass-ceramics before chemical strengthening, after chemical strengthening, the composition at the surface of the glass-ceramics product may be different from the composition of the glass-ceramics before its ion exchange process. This is because, during ion exchange, in the newly formed glass-ceramics, one type of alkali metal ion (e.g., Li + or Na + ) at the surface of the glass-ceramics will be replaced by larger alkali metal ions (e.g., Na + or K + ) respectively. However, in the embodiment, the glass composition and phase assemblage at or near the depth center of the glass-ceramics product will still have the composition and phase assemblage of the newly formed glass-ceramics. That is to say, in this application, the composition (e.g., the composition of the compressive stress layer) and phase assemblage at the center of the chemically strengthened glass-ceramics are the same as or substantially the same as those of the newly formed high-lithium-content glass-ceramics.

[0173] In this application, the chemically strengthened glass-ceramics contains a lithium disilicate crystal phase, and the lithium disilicate crystal phase has a higher weight percentage than other crystal phases present in the chemically strengthened glass-ceramics; calculated on a molar percentage basis of oxides, the composition at the center of the chemically strengthened glass-ceramics includes: SiO2: 41.00 mol% - 69.50 mol%, Al2O3: 0.00 mol% - 2.00 mol%, P2O5: 1.50 mol% - 3.00 mol%, ZrO2: 2.00 mol% - 6.00 mol%, MgO: 0.00 mol% - 2.00 mol%, ZnO: 0.00 mol% - 2.00 mol%, Na2O: 0.00 mol% - 3.00 mol%, K2O: 0.00 mol% - 1.00 mol%, Li2O: 27.00 mol% - 32.00 mol%, CaO: 0.00 mol% - 5.00 mol%, B2O3: 0.00 mol% - 1.00 mol%, SrO: 0.00 mol% - 2.00 mol%; calculated based on the content expressed as the molar percentage of each oxide in the composition at the center of the chemically strengthened glass-ceramics, the composition at the center of the chemically strengthened glass-ceramics satisfies: 0.20 ≤ 2.25×Li2O - 8×ZrO2 - 0.2×CaO ≤ 0.41, preferably 0.21 ≤ 2.25×Li2O - 8×ZrO2 - 0.2×CaO ≤ 0.39.

[0174] In some embodiments of the present application, the chemically strengthened glass-ceramic has a DOL_0 of 0.20t - 0.25t, where DOL_0 is the depth of the compressive stress layer and t is the thickness of the chemically strengthened glass-ceramic. In some embodiments, the depth DOL_0 of the compressive stress layer of the chemically strengthened glass-ceramic can be 0.20t - 0.25t, 0.21t - 0.24t, 0.21t - 0.25t, or 0.22t - 0.25t. Exemplarily, when the thickness of the chemically strengthened glass-ceramic is 0.5 mm, the DOL_0 of the chemically strengthened glass-ceramic can be 0.100 mm, 0.105 mm, 0.110 mm, 0.112 mm, 0.113 mm, 0.114 mm, 0.115 mm, 0.116 mm, 0.117 mm, 0.118 mm, 0.119 mm, 0.120 mm, 0.121 mm, 0.122 mm, 0.123 mm, 0.124 mm, or 0.125 mm, or a value within the numerical range formed by any two of the above specific values as endpoints, as long as the chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramic with the required performance of the present application can be obtained. The DOL_0 of the chemically strengthened glass-ceramic within the above range indicates that the chemically strengthened glass-ceramic has a high depth of the compressive stress layer, which is more conducive to offsetting the energy driving crack propagation, thereby ensuring its excellent damage resistance, such as excellent drop resistance.

[0175] In some embodiments of the present application, the chemically strengthened glass-ceramics have a |CT_AV| of 80 MPa - 200 MPa, where |CT_AV| is the absolute value of the average tensile stress; preferably, they have a |CT_AV| of 90 MPa - 200 MPa. In some embodiments, the chemically strengthened glass-ceramics have a |CT_AV| of 80 MPa - 200 MPa, 90 MPa - 200 MPa, 90 MPa - 180 MPa, 100 MPa - 150 MPa, 130 MPa - 180 MPa, 80 MPa - 100 MPa, 85 MPa - 120 MPa, 90 MPa - 150 MPa, 95 MPa - 180 MPa, 100 MPa - 140 MPa, or 120 MPa - 140 MPa. In some embodiments, the chemically strengthened glass-ceramics have a |CT_AV| of 80 MPa, 90 MPa, 100 MPa, 110 MPa, 120 MPa, 130 MPa, 140 MPa, 150 MPa, 160 MPa, 170 MPa, 180 MPa, 190 MPa, or 200 MPa, or a |CT_AV| within the numerical range formed by 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 range, as long as the chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. The ∣CT_AV∣ of the chemically strengthened glass-ceramics within the above range indicates that the chemically strengthened glass-ceramics have a relatively high tensile stress level, reflecting a relatively high surface stress level. The higher the surface compressive stress level, the more residual energy of dropping, extrusion, impact, or collision can be offset, thereby ensuring its excellent anti-damage performance.

[0176] In some embodiments of the present application, the chemically strengthened glass-ceramics have a CT_LD of 50,000 MPa / mm - 100,000 MPa / mm, where CT_LD is the tensile stress line density; preferably, they have a CT_LD of 55,000 MPa / mm - 100,000 MPa / mm. In some embodiments, the chemically strengthened glass-ceramics have 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 have 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 a CT_LD within a numerical range formed by any two of the above specific values as endpoints, as long as the chemically strengthened glass-ceramics with the required properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramics with the required properties of the present application can be obtained. The 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, showing that the chemically strengthened glass-ceramics have a high surface stress level, thereby ensuring its excellent anti-damage performance, such as excellent anti-drop performance.

[0177] In some embodiments of the present application, the chemically strengthened glass-ceramic has a CS_50 of 150 MPa - 280 MPa, where CS_50 refers to the compressive stress value at a depth of 50 μm measured from the main surface of the chemically strengthened glass-ceramic; preferably, it has a CS_50 of 160 MPa - 280 MPa. In some embodiments, the chemically strengthened glass-ceramic has a CS_50 of 150 MPa - 280 MPa, 160 MPa - 270 MPa, 165 MPa - 265 MPa, 170 MPa - 260 MPa, 180 MPa - 280 MPa, 165 MPa - 250 MPa, or 180 MPa - 200 MPa. In some embodiments, the chemically strengthened glass-ceramic has a CS_50 of 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, or 280 MPa, or a CS_50 within the numerical range formed by any two of the above specific values as endpoints, as long as the chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramic with the required performance of the present application can be obtained. The range of CS_50 of the chemically strengthened glass-ceramic is within the above range, indicating that the compressive stress at a depth of 50 μm measured from the surface of the chemically strengthened glass-ceramic is high, which shows that the chemically strengthened glass-ceramic has a high surface stress level. And the more the remaining energy of dropping, extrusion, impact, or collision that can be offset by the higher surface compressive stress level, thereby ensuring that it has excellent anti-damage performance, such as excellent anti-drop performance.

[0178] In the present application, by making the chemically strengthened glass-ceramic satisfy specific stress characteristics, it is possible to ensure that the chemically strengthened glass-ceramic has excellent mechanical strength performance, excellent mechanical strength performance, and excellent anti-damage performance, especially excellent anti-drop damage performance.

[0179] In some embodiments of the present application, an 80-mesh sandpaper is used to conduct a sandpaper drop test on the chemically strengthened glass-ceramics with a thickness of 0.5 mm. The average sandpaper drop height of the chemically strengthened glass-ceramics is ≥ 1.0 m, preferably the average sandpaper drop height is ≥ 1.2 m, and more preferably the average sandpaper drop height is ≥ 1.5 m. This indicates that the chemically strengthened glass-ceramics of the present application have excellent drop resistance performance. In some embodiments, an 80-mesh sandpaper is used to conduct a sandpaper drop test on the chemically strengthened glass-ceramics with a thickness of 0.5 mm. The average sandpaper drop height of the chemically strengthened glass-ceramics can be 1.0 m, 1.1 m, 1.2 m, 1.3 m, 1.4 m, 1.5 m, 1.6 m, 1.7 m, 1.8 m, 1.9 m, 2.0 m or 2.1 m, etc.

[0180] The chemically strengthened glass-ceramics of the present application can be obtained by chemically strengthening the aforementioned glass-ceramics with a high lithium content. The chemical strengthening process can be carried out with reference to the process in the prior art. For example, it can include: first heating a molten salt containing a certain sodium ion concentration to the temperature required for chemical strengthening, then preheating the glass-ceramics with a high lithium content (for example, the heating rate can be 5 °C / min - 100 °C / min during preheating) to the required chemical strengthening temperature and then putting it into the molten salt. After the constant temperature treatment reaches the required time for chemical strengthening, take it out, cool it to room temperature, wash the salt adhered to the surface, and dry it to obtain chemically strengthened glass-ceramics with a high stress level.

[0181] In some embodiments of the present application, the temperature of the molten salt bath for the chemical strengthening treatment can be 400 °C - 530 °C, and the time for the chemical strengthening treatment can be 0.5 h - 24 h. In some embodiments of the present application, by mass ratio, the components of the molten salt include 4.8 wt% - 100 wt% sodium salt, 0 - 95 wt% potassium salt, and 0 - 0.2 wt% lithium salt. Further, the selected sodium salt, potassium salt, and lithium salt can each independently be nitrate, sulfate, phosphate, or carbonate, etc. In some embodiments, after the chemical strengthening treatment is completed, when cooling the chemically strengthened glass-ceramics, the cooling rate can be 1 °C / min - 50 °C / min.

[0182] The provided high-lithium-content glass-ceramics or chemically strengthened glass-ceramics with excellent performance 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 central controls, electronic whiteboard glasses, smart homes, and can also be used in vehicles, aircraft or spacecraft, and can also be used in glass devices of any required glass-ceramics. For example, it can be used for display screens, cover glasses, touchscreens, inner glass screens or inner frames of electronic devices, etc.; for example, it can be used for windshield glasses of vehicles, aircraft or spacecraft, such as front windshield glasses or side windshield glasses. For example, it can be used for workbench surfaces, other surfaces, appliance doors, floor tiles, wall panels or storage containers, etc. Other surfaces can include but not limited to exterior wall surfaces, stair tread surfaces, column facings or counter surfaces, etc., and storage containers can include but not limited to cups, plates, medicine bottles or beverage bottles, etc.

[0183] The embodiments of the present application will be described in detail below. They are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0184] In the instance numbers in the following table, S refers to an example, such as S1 referring to Example 1; D refers to a comparative example, such as D1 referring to Comparative Example 1.

[0185] Example 1

[0186] (1) Preparation of the base glass:

[0187] Weigh raw materials with a total mass of 1000 g (the raw materials are configured according to the formula of S1 in Table 1, and the proportions of its various oxides are shown in Table 2), add 5 g of sodium chloride to the configured raw materials, mix them in a V-type mixer at a rotation speed of 25 r / min for 30 min, and melt them in a platinum crucible at 1650 °C for 5 h. Then pour them into a mold to form a glass brick. After cooling to 900 °C, put it into an annealing furnace at 460 °C for annealing for 12 h, and then cool it to room temperature with the furnace, and the base glass brick can be obtained.

[0188] (2) Preparation of the high-lithium-content glass-ceramics: Put the base glass brick into the annealing furnace, heat it from room temperature to 525 °C at a heating rate of 10 °C / min for nucleation treatment, keep it at this temperature for 240 min, then heat it to 685 °C at a heating rate of 10 °C / min for crystallization treatment, keep it at this temperature for 60 min, and then cool it to room temperature at a cooling rate of 1 °C / min, and the high-lithium-content glass-ceramics sample brick can be obtained. In terms of the molar percentage of oxides, the composition of the prepared high-lithium-content glass-ceramics is the same as that of the base glass, as detailed in Table 1 - Table 2.

[0189] After the obtained microcrystalline glass-like bricks with high lithium content are successively subjected to cutting, CNC machining (the model of the CNC instrument and equipment used in this application is: RCG500S), and polishing cold processing, microcrystalline glass samples with high lithium content meeting the required specifications and requirements can be prepared. In this application, the microcrystalline glass-like bricks with high lithium content are subjected to the aforementioned cold processing to form microcrystalline glass samples with a thickness of 0.50 mm. Specifically, microcrystalline glass polished sheet samples of 50 mm × 50 mm × 0.50 mm are formed.

[0190] Situation of testing the obtained microcrystalline glass samples with high lithium content:

[0191] The main crystal phase composition, crystallinity, average crystal size, density, refractive index, Young's modulus of the microcrystalline glass samples with high lithium content are respectively tested, and the optical b value and transmittance (under the light of 550 nm wavelength) of the microcrystalline glass samples with high lithium content having a thickness of 0.5 mm are tested. The results are shown in Table 3 respectively.

[0192] (3) Preparation of chemically strengthened microcrystalline glass: The obtained microcrystalline glass samples with high lithium content are preheated in the strengthening furnace cavity for 5 min, and then quickly placed in a molten salt at 500 °C for chemical strengthening. The composition of the molten salt is 29.99 wt% NaNO3 + 69.98 wt% KNO3 + 0.03 wt% LiNO3. After chemical strengthening for 4.75 h, the glass samples are taken out and slowly cooled to room temperature on the furnace body of the strengthening furnace, and then the salts wrapped on the glass surface are washed off with clear water. After drying the glass samples, chemically strengthened microcrystalline glass can be obtained.

[0193] Situation of testing the chemically strengthened microcrystalline glass obtained in S1:

[0194] Ⅰ. Judgment on whether the chemically strengthened microcrystalline glass has "surface cracking": Irradiate the glass surface with a 500 - 2000 lumen light. If Figure 4 , and if bright silk seams are observed, it indicates that the chemically strengthened microcrystalline glass has "surface cracking"; or if a large number of irregular cracks are observed on the surface of the chemically strengthened microcrystalline glass under an optical microscope, such as Figure 4B , it can also indicate that the chemically strengthened microcrystalline glass has "surface cracking", which is recorded as the appearance "surface cracking". If there are no such bright silk seams and irregular cracks on the glass surface, it indicates that the chemically strengthened microcrystalline glass has no "surface cracking" in appearance, which is recorded as "good". The effect of the chemically strengthened microcrystalline glass in this example under strong light irradiation is as shown in Figure 1 , and the morphology diagram of the cross-section along the thickness direction of the chemically strengthened microcrystalline glass under an optical microscope (magnified 200 times) is as shown in Figure 3 . It can be seen that there are no such bright silk seams, and there are no irregular cracks inside and on the surface of the glass. The appearance results are recorded in Table 4.

[0195] II. If there is no "surface cracking" on the surface of the chemically strengthened glass-ceramics, then measure CS_50, DOL_0, and |CT_AV| of the chemically strengthened glass-ceramics using an SLP2000 (Luceo, Japan) stress meter (the light source wavelength used is 518 nm, SOC = 25.5 (nm / cm) / MPa, the refractive index is set according to the refractive index value of the glass-ceramics, the refractive index of the high-lithium-content glass-ceramics of S1 is 1.5600, exposure time: 300 μsec); then calculate the value of the tensile stress linear density (CT_LD). The results are shown in Table 4.

[0196] III. Test the average anti-sanding paper drop height of the chemically strengthened glass-ceramics. The results are shown in Table 4.

[0197] Examples 2 - 14

[0198] They are respectively carried out with reference to Example 1. The differences are that the raw material compositions, different process parameters, and their corresponding test results of each example are shown in Tables 1 - 4 respectively.

[0199] Among them, the effect of the chemically strengthened glass-ceramics of Example 2 under strong light irradiation is as Figure 2 shown, there is no bright silk seam, and the appearance quality is good.

[0200] The comparison diagram of the XRD patterns of the high-lithium-content glass-ceramics of Example 4 and the chemically strengthened glass-ceramics prepared from the high-lithium-content glass-ceramics is as Figure 10 shown. It can be seen that there is no obvious difference in the XRD patterns of the high-lithium-content glass-ceramics of Example 4 before and after chemical strengthening treatment.

[0201] In Example 6, the transmittance of the obtained high-lithium-content glass-ceramics in the wavelength range of 360 nm - 740 nm is as Figure 7 shown, and the X-ray diffraction pattern (i.e., XRD pattern) of the high-lithium-content glass-ceramics is as Figure 8 shown. It can be seen that the main crystal phase of the high-lithium-content glass-ceramics is the lithium disilicate crystal phase, which is transparent in the visible light range and has a high transmittance.

[0202] In Example 8, the thermal expansion coefficient test curve of the obtained high-lithium-content glass-ceramics is as Figure 11 shown. It can be seen that the expansion softening point temperature of the high-lithium-content glass-ceramics is 777 °C, indicating that the high-lithium-content glass-ceramics are more easily subjected to 3D thermoforming.

[0203] Comparative Examples 1 - 15

[0204] They are respectively carried out with reference to Example 1. The differences are that the raw material compositions, different process parameters, and their corresponding test results of each comparative example are shown in Tables 5 - 8 respectively.

[0205] Among them, in Comparative Example 1, the comparison chart of the XRD patterns of the glass-ceramics before and after chemical strengthening is as follows Figure 9 As shown, it can be seen that after the glass-ceramics in Comparative Example 1 were chemically strengthened in a high-temperature salt bath to obtain chemically strengthened glass-ceramics, the structure changed significantly. Specifically, in the range of 2θ from 35.30° to 35.90°, there was no diffraction peak for the glass-ceramics before chemical strengthening, but diffraction peaks appeared for the prepared chemically strengthened glass-ceramics. The effect of the chemically strengthened glass-ceramics of Comparative Example 1 under strong light irradiation is as follows Figure 4 As shown, and the effect under an optical microscope is as follows Figure 4A and Figure 4B As shown, it can be seen that after the glass-ceramics in Comparative Example 1 were chemically strengthened in a high-temperature salt bath, the problem of "surface cracking" occurred, that is, there were a large number of "cracks" on the surface of the prepared chemically strengthened glass-ceramics.

[0206] The surface of the chemically strengthened glass-ceramics of Comparative Example 12 showed a "peeling" phenomenon, and the effect is as follows Figure 5 As shown; and its effect under an optical microscope is as follows Figure 6 As shown, it can be seen that its surface "peeled off".

[0207] The chemically strengthened glass-ceramics of Comparative Examples 1-11 all showed the phenomenon of "surface cracking", and the surface of the chemically strengthened glass-ceramics of Comparative Example 12 showed the phenomenon of "peeling". Such chemically strengthened glass-ceramics obviously did not meet the usage requirements, so the stress distribution data and exchange amount were not tested and calculated. Since the prepared glass-ceramics of Comparative Example 13 showed the problem of devitrification (that is, its transmittance at 550 nm was lower than 85%), subsequent tests and chemical strengthening were not carried out either.

[0208] Crystallization upper limit temperature test: In order to analyze the industrial mass production feasibility of the high-lithium-content glass-ceramics of the present application, the crystallization upper limit temperatures of the substrate glasses of some examples were 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 of which were lower than 1100 °C. The crystallization upper limit temperature was between 1000 °C and 1100 °C, indicating that the high-lithium-content glass-ceramics of the present application are conducive to industrial batch production and manufacturing.

[0209] Dilatometric softening point test: In order to analyze the 3D thermal bending effect of the high-lithium-content glass-ceramics of the present application, the thermal expansion coefficient test curves of the high-lithium-content glass-ceramics in some examples were tested, and the dilatometric softening points were obtained. See Table 3 for details. From the test results, it can be known that the dilatometric softening points of the high-lithium-content glass-ceramics of the present application are all lower than 820 °C and are between 750 °C and 820 °C, indicating that the high-lithium-content glass-ceramics of the present application are conducive to 3D thermal bending to prepare 3D curved glass-ceramics.

[0210] Table 1

[0211]

[0212] Table 2

[0213]

[0214] Note: In Table 2, the percentage content in terms of oxide moles is substituted into each formula, that is, the mole unit does not participate in the calculation of the formula.

[0215] Table 3

[0216]

[0217] Note: In Table 3, " / " indicates not detected.

[0218] Table 4

[0219]

[0220] Table 5

[0221]

[0222]

[0223] Table 6

[0224]

[0225] Note: In Table 6, the percentage content in terms of oxide moles is substituted into each formula, that is, the mole unit does not participate in the calculation of the formula.

[0226] Table 7

[0227]

[0228]

[0229] Note: In Table 7, " / " indicates not detected.

[0230] Table 8

[0231]

[0232] Note: In Table 8, " / " indicates not detected.

[0233] From the examples in Table 1 - Table 4 and the comparative results in Table 5 - Table 8 above, it can be seen that compared with the comparative examples, adopting the embodiment scheme of the present application, while meeting the content ranges of various oxides, it also meets the compositional characteristic of 0.20 ≤ 2.25×Li2O - 8×ZrO2 - 0.2×CaO ≤ 0.41. The prepared microcrystalline glass with a high lithium content is suitable for high-temperature chemical strengthening, and can obtain high stress performance after high-temperature chemical strengthening. The chemically strengthened microcrystalline glass will not show "surface cracking" and / or "peeling", and at the same time, the chemically strengthened microcrystalline glass takes into account excellent optical properties, has relatively high CS_50, |CT_AV|, DOL_0, CT_LD, and has excellent anti-drop performance.

[0234] In the schemes of Comparative Examples 1 - 15, their glass formulations do not simultaneously meet the content ranges of various oxides of the present application and the compositional characteristic of 0.20 ≤ 2.25×Li2O - 8×ZrO2 - 0.2×CaO ≤ 0.41. After the prepared high-lithium-content microcrystalline glass is subjected to high-temperature chemical strengthening, the obtained chemically strengthened microcrystalline glass either shows "surface cracking" and / or "peeling" phenomena, or has poor optical properties or stress performance. Among them, in the schemes of Comparative Examples 1 - 11, the obtained chemically strengthened microcrystalline glass shows "surface cracking" phenomena, the chemically strengthened microcrystalline glass in Comparative Example 12 shows "peeling" phenomena, the microcrystalline glass in Comparative Example 13 shows devitrification and has poor optical properties, and the stress performance of Comparative Examples 14 - 15 is poor.

[0235] The preferred embodiments of the present application have been described in detail above. However, the present application is not limited thereto. Within the scope of the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, including any other suitable combination of each technical feature. These simple modifications and combinations should also be regarded as the content disclosed by the present application and fall within the protection scope of the present application.

Claims

1. A high-lithium-content glass-ceramics, characterized in that, The high-lithium-content glass-ceramics contain a lithium disilicate crystal phase, where the lithium disilicate crystal phase has a higher weight percentage than other crystal phases present in the high-lithium-content glass-ceramics; the high-lithium-content glass-ceramics are transparent in the visible light range; In terms of the molar percentage of oxides, the composition of the high-lithium-content glass-ceramics includes: SiO2: 60.00 mol% - 69.50 mol%, Al2O3: 0.00 mol% - 2.00 mol%, P2O5: 1.50 mol% - 3.00 mol%, ZrO2: 2.00 mol% - 6.00 mol%, MgO: 0.00 mol% - 2.00 mol%, ZnO: 0.00 mol% - 2.00 mol%, Na2O: 0.00 mol% - 3.00 mol%, K2O: 0.00 mol% - 1.00 mol%, Li2O: 27.50 mol% - 32.00 mol%, CaO: 0.00 mol% - 5.00 mol%, B2O3: 0.00 mol% - 1.00 mol%, SrO: 0.00 mol% - 2.00 mol%; Based on the contents expressed as the molar percentages of the respective oxides in the composition of the high-lithium-content glass-ceramics, the composition of the high-lithium-content glass-ceramics satisfies: 2.07 ≤ SiO2 / Li2O ≤ 2.30, 0.20 ≤ 2.25×Li2O - 8×ZrO2 - 0.2×CaO ≤ 0.41, 0 ≤ (CaO + MgO + ZnO + Na2O + K2O) / (ZrO2 + Li2O) ≤ 0.15, 0.25 ≤ (2.2×ZrO2 + 0.35×CaO + Na2O) / Li2O ≤ 0.

45.

2. The high-lithium-content glass-ceramics according to claim 1, characterized in that, 0.21 ≤ 2.25×Li2O - 8×ZrO2 - 0.2×CaO ≤ 0.39, and / or, 0.90 ≤ SiO2 + Li2O ≤ 0.

95.

3. The high-lithium-content glass-ceramics according to claim 1, characterized in that, 0.27 ≤ (2.2×ZrO2 + 0.35×CaO + Na2O) / Li2O ≤ 0.

43.

4. The high-lithium-content glass-ceramics according to claim 1, characterized in that, 0 ≤ (CaO + MgO + ZnO + Na2O + K2O) / (ZrO2 + Li2O) ≤ 0.

14.

5. The lithium-rich glass-ceramics according to any one of claims 1-4, characterized in that Based on the contents expressed as the molar percentages of the respective oxides in the composition of the high-lithium-content glass-ceramics, the composition of the high-lithium-content glass-ceramics satisfies: 0 ≤ (CaO + SrO) / ZrO2 ≤ 1.50; and / or, 0 ≤ Al2O3 / (SiO2 + Al2O3) ≤ 0.

03.

6. The high-lithium-content glass-ceramics according to any one of claims 1-4, characterized in that, In terms of the molar percentage of oxides, in the high-lithium-content glass-ceramics: The content of SiO2 is 60.00 mol% - 65.00 mol%; and / or, The content of Li2O is 27.50 mol% - 31.00 mol%; and / or, The content of ZrO2 is 3.00 mol% - 6.00 mol%; and / or, The content of P2O5 is 1.50 mol% - 2.50 mol%; and / or, The content of CaO is 0.00 mol% - 4.00 mol%; and / or, The content of Na2O is 0.00 mol% - 1.00 mol%.

7. The high-lithium-content glass-ceramics according to claim 6, characterized in that, In the high-lithium-content glass-ceramics, in terms of the molar percentage of oxides: The content of SiO2 is 61.00 mol% - 63.50 mol%; and / or, The content of Li2O is 28.00 mol% - 30.50 mol%; and / or, The content of ZrO2 is 3.50 mol% - 6.00 mol%; and / or, The content of P2O5 is 1.60 mol% - 2.10 mol%; and / or, The content of CaO is 0.00 mol% - 2.00 mol%; and / or The content of Na2O is 0.00 mol% - 1.00 mol%.

8. The high-lithium-content glass-ceramics according to claim 7, wherein, In the high-lithium-content glass-ceramics, in terms of the molar percentage of oxides: the content of SiO2 is 62.00 mol% - 63.00 mol%; and / or, The content of ZrO2 is 4.00 mol% - 5.00 mol%; and / or, The content of Na2O is 0.00 mol% - 0.50 mol%.

9. The lithium-rich glass-ceramics according to any one of claims 1-4, characterized in that, In terms of the molar percentage of oxides, the composition of the high-lithium-content glass-ceramics further includes: Y2O3: 0.00 mol% - 1.00 mol%, La2O3: 0.00 mol% - 1.00 mol%, Ta2O5: 0.00 mol% - 1.00 mol%.

10. The high-lithium-content glass-ceramics according to claim 6, characterized in that, In terms of the molar percentage of oxides, the composition of the high-lithium-content glass-ceramics further includes: Y2O3: 0.00 mol% - 1.00 mol%, La2O3: 0.00 mol% - 1.00 mol%, Ta2O5: 0.00 mol% - 1.00 mol%.

11. The lithium-rich glass-ceramics according to any one of claims 1-4, characterized in that, Based on the content expressed in the molar percentage of each oxide in the composition of the high-lithium-content glass-ceramics, the composition of the high-lithium-content glass-ceramics satisfies: 0 ≤ (CaO + MgO + ZnO + Na2O + K2O) / (ZrO2 + Li2O) ≤ 0.10; and / or, 0.90 ≤ SiO2 + Li2O ≤ 0.93; and / or, 0 ≤ (CaO + SrO) / ZrO2 ≤ 1.

00.

12. The glass-ceramics with high lithium content according to claim 11, wherein, 0 ≤ (CaO + SrO) / ZrO2 ≤ 0.

70.

13. The high-lithium-content glass-ceramics according to claim 5, characterized in that, Based on the content expressed in the molar percentage of each oxide in the composition of the high-lithium-content glass-ceramics, the composition of the high-lithium-content glass-ceramics satisfies: 0 ≤ (CaO + MgO + ZnO + Na2O + K2O) / (ZrO2 + Li2O) ≤ 0.10; and / or, 0.90 ≤ SiO2 + Li2O ≤ 0.93; and / or, 0 ≤ (CaO + SrO) / ZrO2 ≤ 1.

00.

14. The high-lithium-content glass-ceramics according to claim 6, characterized in that, Based on the content expressed in the molar percentage of each oxide in the composition of the high-lithium-content glass-ceramics, the composition of the high-lithium-content glass-ceramics satisfies: 0 ≤ (CaO + MgO + ZnO + Na2O + K2O) / (ZrO2 + Li2O) ≤ 0.10; and / or, 0.90 ≤ SiO2 + Li2O ≤ 0.93; and / or, 0 ≤ (CaO + SrO) / ZrO2 ≤ 1.

00.

15. The high-lithium-content glass-ceramics according to any one of claims 1-4, characterized in that, The density ρ of the microcrystalline glass with a high lithium content is ≥ 2.54 g / cm 3 , and the refractive index is ≤ 1.

60.

16. The high-lithium-content glass-ceramics according to claim 5, characterized in that, The density ρ of the microcrystalline glass with a high lithium content is ρ ≥ 2.54 g / cm 3 , and the refractive index is ≤ 1.

60.

17. The high-lithium-content glass-ceramics according to claim 9, wherein, The density ρ of the microcrystalline glass with a high lithium content is ρ ≥ 2.54 g / cm 3 , and the refractive index is ≤ 1.

60.

18. The high-lithium-content glass-ceramics according to any one of claims 1-4, characterized in that, In terms of the molar percentage of oxides, in the composition of the high-lithium-content glass-ceramics: The content of SiO2 is 62.55 mol%, 62.58 mol%, 61.82 mol%, 61.72 mol%, 61.87 mol%, 61.76 mol%, 62.59 mol%, 61.15 mol%, 61.25 mol%, 61.06 mol%, 63.17 mol% or 62.01 mol%; and / or, The content of Li2O is 27.54 mol%, 28.59 mol%, 29.8 mol%, 29.52 mol%, 29.08 mol%, 29.93 mol%, 29.25 mol%, 29.3 mol% or 29.66 mol%; and / or, The content of ZrO2 is 2.58 mol%, 4.68 mol%, 4.66 mol%, 3.16 mol%, 3.72 mol%, 4.21 mol%, 4.57 mol%, 5.1 mol%, 5.54 mol%, 4.72 mol%, 4.63 mol% or 4.61 mol%; and / or, The content of P2O5 is 2.06 mol%, 1.87 mol%, 1.86 mol%, 1.85 mol%, 1.88 mol%, 1.89 mol% or 1.83 mol%; and / or, The content of Al2O3 is 1.55 mol%, 0 mol%, 1.4 mol%, 1.38 mol%, 1.41 mol% or 1.37 mol%.

19. The high-lithium content glass-ceramics according to any one of claims 1-4, characterized in that, Based on the content expressed as the molar percentage of each oxide in the high-lithium-content glass-ceramic composition, the composition of the high-lithium-content glass-ceramic satisfies: The value of SiO2 + Li2O is 90.09%, 91.17%, 91.62%, 90.95%, 91.56%, 92.52%, 90.40%, 90.91%, 90.58%, 92.47%, 91.67%, 91.24% or 90.40%; and / or, The value of SiO2 / Li2O is 2.27, 2.19, 2.07, 2.13, 2.16 or 2.09; and / or, The value of 2.25×Li2O - 8×ZrO2 - 0.2×CaO is 40.58%, 26.70%, 29.77%, 29.36%, 40.15%, 37.10%, 33.66%, 28.89%, 25.94%, 22.10%, 28.17%, 29.70%, 29.54% or 29.25%; and / or, The value of (CaO + MgO + ZnO + Na2O + K2O) / (ZrO2 + Li2O) is 0.124, 0.069, 0.081, 0.028, 0.000, 0.054 or 0.027; and / or, The value of (2.2×ZrO2 + 0.35×CaO + Na2O) / Li2O is 0.253, 0.372, 0.328, 0.286, 0.309, 0.366, 0.378, 0.413, 0.354, 0.343 or 0.

344.

20. The high-lithium-content glass-ceramics according to any one of claims 1-4, characterized in that, At a thickness of 0.5 mm, the b value of the high-lithium-content glass-ceramics ≤ 1.0; and / or, At a thickness of 0.5 mm, for light with a wavelength of 550 nm, the transmittance of the high-lithium-content glass-ceramics ≥ 85.00%.

21. The high-lithium-content glass-ceramics according to claim 20, characterized in that, At a thickness of 0.5 mm, the b value of the high-lithium-content glass-ceramics ≤ 0.8; and / or, At a thickness of 0.5 mm, for light with a wavelength of 550 nm, the transmittance of the high-lithium-content glass-ceramics ≥ 90.00%.

22. The high-lithium-content glass-ceramics according to claim 21, wherein, At a thickness of 0.5 mm, the b value of the high-lithium-content glass-ceramics is 0.1 - 0.8; and / or, At a thickness of 0.5 mm, for light with a wavelength of 550 nm, the transmittance of the high-lithium-content glass-ceramics is 90.00% - 92.00%.

23. The high-lithium-content glass-ceramics according to claim 5, characterized in that, At a thickness of 0.5 mm, the b value of the high-lithium-content glass-ceramics ≤ 1.0; and / or, At a thickness of 0.5 mm, for light with a wavelength of 550 nm, the transmittance of the high-lithium-content glass-ceramics ≥ 85.00%.

24. The high-lithium-content glass-ceramics according to claim 9, wherein, At a thickness of 0.5 mm, the b value of the high-lithium-content glass-ceramics ≤ 1.0; and / or, At a thickness of 0.5 mm, for light with a wavelength of 550 nm, the transmittance of the high-lithium-content glass-ceramics ≥ 85.00%.

25. The high-lithium-content glass-ceramics according to any one of claims 1-4, characterized in that, The crystallinity of the high-lithium-content glass-ceramics is 30.00 wt% - 90.00 wt%; and / or, In the high-lithium-content glass-ceramics, the average crystal size ≤ 100 nm.

26. The glass-ceramics with high lithium content according to claim 24, characterized in that, The crystallinity of the high-lithium-content glass-ceramics is 50.00 wt% - 90.00 wt%; and / or, In the high-lithium-content glass-ceramics, the average crystal size ≤ 50 nm.

27. The high-lithium-content glass-ceramics according to claim 26, characterized in that, The average crystal size in the high-lithium-content glass-ceramics is 15 nm - 45 nm.

28. The high-lithium-content glass-ceramics according to claim 5, characterized in that, The crystallinity of the high-lithium-content glass-ceramics is 30.00 wt% - 90.00 wt%; and / or, In the high-lithium-content glass-ceramics, the average crystal size ≤ 100 nm.

29. The high-lithium-content glass-ceramics according to claim 9, wherein The crystallinity of the high-lithium-content glass-ceramics is 30.00 wt% - 90.00 wt%; and / or, In the high-lithium-content glass-ceramics, the average crystal size ≤ 100 nm.

30. The high-lithium-content glass-ceramics according to any one of claims 1-4, characterized in that, The Young's modulus of the high-lithium-content glass-ceramics ≥ 100.00 GPa.

31. The high-lithium-content glass-ceramics according to claim 30, wherein, The Young's modulus of the high-lithium-content glass-ceramics ≥ 110.00 GPa.

32. The high-lithium-content glass-ceramics according to claim 31, characterized in that, The Young's modulus of the high-lithium-content glass-ceramics is 114 GPa - 130 GPa.

33. The high-lithium-content glass-ceramics according to claim 32, characterized in that, The Young's modulus of the high-lithium-content glass-ceramics is 114 GPa - 120 GPa.

34. The high-lithium-content glass-ceramics according to claim 5, characterized in that, The Young's modulus of the high-lithium-content glass-ceramics ≥ 100.00 GPa.

35. The high-lithium-content glass-ceramics according to claim 9, characterized in that, The Young's modulus of the high-lithium-content glass-ceramics ≥ 100.00 GPa.

36. A chemically strengthened microcrystalline glass, characterized in that, The chemically strengthened glass-ceramic is obtained by chemically strengthening a high-lithium-content glass-ceramic as described in any one of claims 1-35. The composition at the center or in the tensile stress layer of the chemically strengthened glass-ceramic is the same as that of the high-lithium-content glass-ceramic as described in any one of claims 1-35. The chemically strengthened glass-ceramic includes a compressive stress layer region extending from the surface of the chemically strengthened glass-ceramic to the compressive depth and has a tensile stress inside the chemically strengthened glass-ceramic.

37. The chemically strengthened glass-ceramics according to claim 36, wherein The chemically strengthened glass-ceramic contains a lithium disilicate crystal phase, and the lithium disilicate crystal phase has a higher weight percentage than other crystal phases present in the chemically strengthened glass-ceramic. In terms of the molar percentage of oxides, the composition at the center or in the tensile stress layer of the chemically strengthened glass-ceramic includes: SiO2: 60.00 mol% - 69.50 mol%, Al2O3: 0.00 mol% - 2.00 mol%, P2O5: 1.50 mol% - 3.00 mol%, ZrO2: 2.00 mol% - 6.00 mol%, MgO: 0.00 mol% - 2.00 mol%, ZnO: 0.00 mol% - 2.00 mol%, Na2O: 0.00 mol% - 3.00 mol%, K2O: 0.00 mol% - 1.00 mol%, Li2O: 27.50 mol% - 32.00 mol%, CaO: 0.00 mol% - 5.00 mol%, B2O3: 0.00 mol% - 1.00 mol%, SrO: 0.00 mol% - 2.00 mol%; Based on the content expressed as the molar percentage of each oxide in the composition at the center or in the tensile stress layer of the chemically strengthened glass-ceramic, the composition at the center or in the tensile stress layer of the chemically strengthened glass-ceramic satisfies: 2.07 ≤ SiO2 / Li2O ≤ 2.30, 0.20 ≤ 2.25×Li2O - 8×ZrO2 - 0.2×CaO ≤ 0.41, 0 ≤ (CaO + MgO + ZnO + Na2O + K2O) / (ZrO2 + Li2O) ≤ 0.15, 0.25 ≤ (2.2×ZrO2 + 0.35×CaO + Na2O) / Li2O ≤ 0.

45.

38. The chemically strengthened glass-ceramics according to claim 37, wherein 0.21 ≤ 2.25×Li2O - 8×ZrO2 - 0.2×CaO ≤ 0.39, and / or, 0.90 ≤ SiO2 + Li2O ≤ 0.

95.

39. The chemically strengthened glass-ceramics according to any one of claims 36-38, characterized in that, The chemically strengthened glass-ceramic has a DOL_0 of 0.20t - 0.25t, where DOL_0 is the depth of the compressive stress layer and t is the thickness of the chemically strengthened glass-ceramic.

40. The chemically strengthened microcrystalline glass according to claim 39, wherein, The chemically strengthened glass-ceramic has a DOL_0 of 0.22t - 0.25t, where DOL_0 is the depth of the compressive stress layer and t is the thickness of the chemically strengthened glass-ceramic.

41. The chemically strengthened microcrystalline glass according to any one of claims 36-38, characterized in that, The chemically strengthened glass-ceramic has a |CT_AV| of 80 MPa - 200 MPa, where |CT_AV| is the absolute value of the average tensile stress.

42. The chemically strengthened microcrystalline glass according to claim 39, characterized in that, The chemically strengthened glass-ceramics has a |CT_AV| of 80 MPa - 200 MPa, where |CT_AV| is the absolute value of the average tensile stress.

43. The chemically strengthened glass-ceramics according to claim 41, wherein The chemically strengthened glass-ceramics has a |CT_AV| of 90 MPa - 200 MPa.

44. The chemically strengthened glass-ceramics according to claim 43, wherein The chemically strengthened glass-ceramics has a |CT_AV| of 130 MPa - 200 MPa.

45. The chemically strengthened glass-ceramics according to any one of claims 36-38, characterized in that, The chemically strengthened glass-ceramics has a CT_LD of 50000 MPa / mm - 100000 MPa / mm, where CT_LD is the tensile stress line density.

46. The chemically strengthened glass-ceramics according to claim 39, characterized in that, The chemically strengthened glass-ceramics has a CT_LD of 50000 MPa / mm - 100000 MPa / mm, where CT_LD is the tensile stress line density.

47. The chemically strengthened glass-ceramics according to claim 41, characterized in that, The chemically strengthened glass-ceramics has a CT_LD of 50000 MPa / mm - 100000 MPa / mm, where CT_LD is the tensile stress line density.

48. The chemically strengthened glass-ceramics according to claim 45, wherein The chemically strengthened glass-ceramics has a CT_LD of 55000 MPa / mm - 100000 MPa / mm.

49. The chemically strengthened glass-ceramics according to claim 48, wherein The chemically strengthened glass-ceramics has a CT_LD of 65000 MPa / mm - 100000 MPa / mm.

50. The chemically strengthened microcrystalline glass according to any one of claims 36-38, characterized in that, The chemically strengthened glass-ceramics has a CS_50 of 150 MPa - 280 MPa, where CS_50 refers to the compressive stress value at a depth of 50 μm measured from the main surface of the chemically strengthened glass-ceramics.

51. The chemically strengthened microcrystalline glass according to claim 39, wherein The chemically strengthened glass-ceramics has a CS_50 of 150 MPa - 280 MPa, where CS_50 refers to the compressive stress value at a depth of 50 μm measured from the main surface of the chemically strengthened glass-ceramics.

52. The chemically strengthened glass-ceramics according to claim 41, characterized in that, The chemically strengthened glass-ceramics has a CS_50 of 150 MPa - 280 MPa, where CS_50 refers to the compressive stress value at a depth of 50 μm measured from the main surface of the chemically strengthened glass-ceramics.

53. The chemically strengthened glass-ceramics according to claim 45, characterized in that, The chemically strengthened glass-ceramics has a CS_50 of 150 MPa - 280 MPa, where CS_50 refers to the compressive stress value at a depth of 50 μm measured from the main surface of the chemically strengthened glass-ceramics.

54. The chemically strengthened glass-ceramics according to claim 50, wherein The chemically strengthened glass-ceramics has a CS_50 of 160 MPa - 280 MPa.

55. The chemically strengthened glass-ceramics according to claim 54, wherein, The chemically strengthened glass-ceramics has a CS_50 of 180 MPa - 280 MPa.

56. The chemically strengthened glass-ceramics according to any one of claims 36-38, characterized in that, Using 80-mesh sandpaper, the anti-sandpaper drop test is carried out on the chemically strengthened glass-ceramics with a thickness of 0.5 mm, and the average anti-sandpaper drop height of the chemically strengthened glass-ceramics is ≥ 1.0 m.

57. The chemically strengthened glass-ceramics according to claim 56, wherein Using 80-mesh sandpaper, the anti-sandpaper drop test is carried out on the chemically strengthened glass-ceramics with a thickness of 0.5 mm, and the average anti-sandpaper drop height of the chemically strengthened glass-ceramics is ≥ 1.2 m.

58. The chemically strengthened glass-ceramics according to claim 57, wherein Using 80-mesh sandpaper, the anti-sandpaper drop test is carried out on the chemically strengthened glass-ceramics with a thickness of 0.5 mm, and the average anti-sandpaper drop height of the chemically strengthened glass-ceramics is ≥ 1.5 m.

59. A glass device, characterized in that, The glass device comprises the high-lithium-content glass-ceramics as described in any one of claims 1 - 35 or comprises the chemically strengthened glass-ceramics as described in any one of claims 36 - 58.

60. An electronic device, characterized in that, The electronic device includes the high-lithium-content glass-ceramics according to any one of claims 1-35 or includes the chemically strengthened glass-ceramics according to any one of claims 36-58.

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