Crystallized glass, chemically strengthened crystallized glass and its applications

Abstract

This application belongs to the technical field of crystallized glass, and more specifically, to crystallized glass, chemically strengthened crystallized glass, and its applications. The crystallized glass contains a lithium disilicate crystalline phase as the main crystalline phase, and the content of each oxide has a specific range, and the composition of the crystallized glass satisfies 2.00 ≤ SiO2 / Li2O ≤ 2.40, expressed as the mole fraction of each oxide in the composition of the crystallized glass. The crystallized glass according to this application has high intrinsic strength and excellent optical performance, and chemical strengthening can be used to prepare chemically strengthened crystallized glass with a high stress level and excellent deformation resistance.

Description

[Technical Field]

[0001] This application belongs to the technical field of crystallized glass, and more specifically, relates to crystallized glass having excellent deformation resistance, chemically strengthened crystallized glass, and its applications.

[0002] Cross-references of related applications This application claims priority based on a Chinese application filed with the China Patent Office on February 2, 2024, with application number 202410156362.3, titled "Crystallized Glass, Chemically Strengthened Crystallized Glass and its Applications," the entirety of which is incorporated into this application by reference. [Background technology]

[0003] With the advent of the intelligent age, portable electronic devices such as mobile phones, tablets, and watches have become indispensable in daily life. However, the majority of damage to these devices is due to screen breakage. The emergence of crystallized glass such as "Kunlun Glass," "Ceramic Shield," and "Titan Glass" has significantly reduced the probability of cover glass breakage. However, there is still room for improvement in the failure of the inner glass screen. When the inner screen fails, phenomena such as loss of touch function, display abnormalities, and screen damage are likely to occur. In particular, due to market needs for larger, thinner, and lighter electronic devices, the thickness of cover glass is becoming increasingly thin. When the cover glass is subjected to pressure or impact and deformed, the inner screen can be compressed, potentially causing the inner screen to fail. Therefore, in order to better improve the problem of inner screen failure caused by impacts to the cover glass, the development of cover glass with superior deformation resistance is urgently needed. [Overview of the project]

[0004] Crystallized glass, as a solid material containing both a microcrystalline phase and a glass phase, exhibits significant advantages in overall strength compared to ordinary glass because the large number of nano-sized microcrystals present within it can inhibit the propagation of microcracks. Among crystallized glasses, those with lithium disilicate as the main crystalline phase show great potential as cover glass for electrical products.

[0005] The lithium disilicate (Li2Si2O5) crystalline phase is an orthorhombic crystal based on a [Si2O5] tetrahedral arrangement, with a flattened or plate-like crystal shape. Within the crystallized glass, the lithium disilicate crystals form an unoriented, interlocked microstructure. This distorts the crack path as cracks pass through the crystal, preventing crack propagation and improving the strength and fracture toughness of the crystallized glass. Furthermore, the lithium disilicate crystal has a refractive index close to that of the glass substrate (e.g., the substrate glass used to prepare the crystallized glass), making it an ideal crystalline phase for preparing highly transparent crystallized glass.

[0006] In view of this, the present application aims to provide a crystallized glass having lithium disilicate as the main crystalline phase, which has high strength and excellent optical performance. Using this crystallized glass, it is possible to prepare a chemically strengthened crystallized glass having a high stress level, excellent deformation resistance, and high mechanical strength by a chemical strengthening treatment method.

[0007] To achieve the above objectives, this application provides the following technical solution.

[0008] This application provides a crystallized glass containing a lithium disilicate crystalline phase, the lithium disilicate crystalline phase having a larger mass fraction than other crystalline phases present in the crystallized glass, and expressing the oxide mole fraction, the composition of the crystallized glass is as follows: SiO2: 55.00 mol%~65.00 mol%, Al2O3: 0.00 mol%~2.00 mol%, P2O5: 1.00 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% The composition of the crystallized glass contains 0.00 mol% to 3.00 mol%, K2O: 0.00 mol% to 1.00 mol%, Li2O: 27.00 mol% to 32.00 mol%, CaO: 0.00 mol% to 5.00 mol%, B2O3: 0.00 mol% to 1.00 mol%, and SrO: 0.00 mol% to 2.00 mol%, expressed as the mole fraction of each oxide in the composition of the crystallized glass. The composition of the crystallized glass satisfies 2.00 ≤ SiO2 / Li2O ≤ 2.40, optionally 2.00 ≤ SiO2 / Li2O ≤ 2.30, and optionally 2.02 ≤ SiO2 / Li2O ≤ 2.20. By optimizing the glass composition, for example, by employing a glass with a relatively high lithium content, a relatively high zirconium content, and a relatively low aluminum content, and by ensuring that each component satisfies specific content relationships and exhibits synergistic effects between the components, it is possible to ensure the precipitation of a lithium disilicate crystal phase with a desired content and suppress the precipitation of other crystal phases (e.g., petalite crystal phase). This contributes to obtaining a crystallized glass with lithium disilicate as the main crystal phase that has high intrinsic strength and excellent optical performance, and also contributes to ensuring that the crystallized glass has a specific composition and structure. This ensures that, after chemical strengthening treatment, a chemically strengthened crystallized glass with a high stress level and excellent deformation resistance can be obtained.

[0009] In some embodiments of this application, the composition of the crystallized glass, expressed as the mole fraction of each oxide in the composition of the crystallized glass, further satisfies 0.90 ≤ SiO2 + Li2O ≤ 0.96, optionally 0.90 ≤ SiO2 + Li2O ≤ 0.95, and / or Al2O3 / SiO2 ≤ 0.030. By adjusting each component to satisfy specific content relationships, it is possible to ensure the formation of a desired crystalline phase structure, improve the stress level generated after the crystallized glass has been chemically strengthened, and thus contribute to the crystallized glass acquiring high mechanical strength performance and excellent deformation resistance.

[0010] In some embodiments of this application, the composition of the crystallized glass is such that, in terms of the content of each oxide expressed as a mole fraction in the composition of the crystallized glass, the composition of the crystallized glass further satisfies 0.31 ≤ ZrO2 / (CaO + ZrO2 + Al2O3) ≤ 1.50, optionally 0.32 ≤ ZrO2 / (CaO + ZrO2 + Al2O3) ≤ 1.20, and optionally 0.36 ≤ ZrO2 / (CaO + ZrO2 + Al2O3) ≤ 1.10. And / or satisfy 0.10 ≤ ZrO2 / (100% - 3 × Li2O) ≤ 0.60, optionally satisfying 0.12 ≤ ZrO2 / (100% - 3 × Li2O) ≤ 0.52, optionally satisfying 0.16 ≤ ZrO2 / (100% - 3 × Li2O) ≤ 0.50, and / or satisfying 0.034 ≤ ZrO2 / SiO2 ≤ 0.100, optionally satisfying 0.035 ≤ ZrO2 / SiO2 ≤ 0.095, and optionally satisfying 0.055 ≤ ZrO2 / SiO2 ≤ 0.095. By adjusting each component to satisfy specific content relationships, it is possible to enhance the effects of each component, improve toughness, and create synergistic effects between components. This ensures high intrinsic strength of crystallized glass and a high stress level after strengthening, thus contributing to crystallized glass acquiring high mechanical strength performance and excellent deformation resistance.

[0011] In some embodiments of this application, the composition of the crystallized glass satisfies the following conditions in terms of the content of each oxide in the composition of the crystallized glass, expressed as the mole fraction: CaO + Al2O3 ≤ 0.065, optionally CaO + Al2O3 ≤ 0.055, optionally CaO + Al2O3 ≤ 0.050, and / or (CaO + Al2O3) / Li2O ≤ 0.25, optionally (CaO + Al2O3) / Li2O ≤ 0.20, and optionally (CaO + Al2O3) / Li2O ≤ 0.14. By adjusting each component to satisfy specific content relationships, it is possible to enhance the effects of each component, avoid affecting the crystal precipitation of the crystallized glass, ensure that the crystallized glass achieves the desired crystalline phase structure, and thus contribute to the crystallized glass acquiring high mechanical strength and excellent deformation resistance.

[0012] In some embodiments of this application, the composition of the crystallized glass is further satisfied by the content of each oxide in mole fraction in the composition of the crystallized glass, such that 0.12 ≤ (ZrO2-Na2O) / (SiO2-2×Li2O) ≤ 6.40, optionally 0.14 ≤ (ZrO2-Na2O) / (SiO2-2×Li2O) ≤ 6.16, optionally 0.50 ≤ (ZrO2-Na2O) / (SiO2-2×Li2O) ≤ 3.00, and / or Na2O / SiO2 ≤ 0.05, optionally Na2O / SiO2 ≤ 0.04, and optionally Na2O / SiO2 ≤ 0.02. By adjusting each component to satisfy specific content relationships, it is possible to better utilize the effects of each component, contribute to crystallized glass acquiring high intrinsic strength and excellent optical performance, and contribute to crystallized glass acquiring high stress levels and excellent deformation resistance after chemical strengthening treatment.

[0013] In some embodiments of the present application, expressed in terms of molar fractions of oxides, in the crystallized glass, the content of SiO₂ is 60.00 mol% to 65.00 mol%, optionally the content of SiO₂ is 60.50 mol% to 64.00 mol%, and / or the content of Li₂O is 28.00 mol% to 31.00 mol%, optionally the content of Li₂O is 29.00 mol% to 30.50 mol%, and / or the content of ZrO₂ is 3.20 mol% to 6.00 mol%, optionally the content of ZrO₂ is 4.00 mol% to 6.00 mol%, and / or the content of P₂O₅ is 1.50 mol% to 3.00 mol%, optionally the content of P₂O₅ is 1.50 mol% to 2.50 mol%, and / or the content of Na₂O is 0.00 mol% to 1.00 mol%, optionally the content of Na₂O is 0.00 mol% to 0.50 mol%, and / or the content of CaO is 0.00 mol% to 4.00 mol%, optionally the content of CaO is 0.00 mol% to 2.50 mol%. Adjusting the composition of the crystallized glass helps the crystallized glass obtain high mechanical strength performance and excellent deformation resistance.

[0014] In some embodiments of the present application, expressed in terms of molar fractions of oxides, the composition of the crystallized glass further comprises Y₂O₃: 0.00 mol% to 1.00 mol%, La₂O₃: 0.00 mol% to 1.00 mol%, and Ta₂O₅: 0.00 mol% to 1.00 mol%. Optionally, adding an appropriate amount of Y₂O₃, La₂O₃ or Ta₂O₅ contributes to increasing the density of the crystallized glass and can increase the Young's modulus, but the refractive index of the crystallized glass increases, which may reduce the optical performance of the crystallized glass.

[0015] In some embodiments of the present application, expressed in terms of molar fractions of oxides, in the crystallized glass, the total content of Na₂O and K₂O expressed in mole percentage is less than 1.00 mol%.

[0016] In some embodiments of the present application, the density ρ of the crystallized glass satisfies ρ≧2.50g / cm3 And optionally, the density ρ of the crystallized glass is 2.50 g / cm³. 3 ~2.75g / cm 3 The density and / or refractive index of the crystallized glass is 1.60 or less. Crystallized glass that satisfies this density and / or refractive index has relatively high intrinsic strength and excellent optical performance.

[0017] In some embodiments of this application, the crystallinity of the crystallized glass is 30.00 wt% to 90.00 wt%, optionally 50.00 wt% to 90.00 wt%, optionally 65.00 wt% to 90.00 wt%, and / or the average grain size of the crystallized glass is 100 nm or less, optionally 50 nm or less, and optionally 15 nm to 45 nm. A relatively high content of the crystalline phase contributes to improving the mechanical strength performance of the crystallized glass, and a relatively small average grain size contributes to the crystallized glass having excellent optical performance.

[0018] In some embodiments of this application, the Young's modulus of the crystallized glass is 100.00 GPa or higher, optionally 110.00 GPa or higher, and optionally 114 GPa to 130 GPa. A relatively high Young's modulus, that is, a relatively high intrinsic strength of the crystallized glass, contributes to achieving relatively high mechanical strength and excellent deformation resistance.

[0019] In some embodiments of this application, when the thickness of the crystallized glass is 0.5 mm, the b-value of the crystallized glass is 1.0 or less, optionally 0.8 or less, and / or the crystallized glass is transparent within the visible light wavelength range, and when the thickness of the crystallized glass is 0.5 mm, the transmittance of the crystallized glass at a wavelength of 550 nm is 85.00% or more, optionally 90.00% or more. Crystallized glass that satisfies the b-value and / or transmittance can be ensured to have relatively excellent optical performance and display effect, and is suitable for use in screens where a display effect is required.

[0020] In some embodiments of this application, the expansion-softening point of the crystallized glass is 750°C to 850°C, and optionally, the expansion-softening point of the crystallized glass is 750°C to 830°C. Depending on the appropriate expansion-softening point, it is possible to prepare crystallized glass with a 3D curved surface that contributes to 3D thermal bending of the crystallized glass and has high strength performance.

[0021] This application further provides a chemically strengthened crystallized glass in which the composition of the central portion of the chemically strengthened crystallized glass is the same as the composition of the crystallized glass described above, and the chemically strengthened crystallized glass includes a compressive stress layer region that extends from the surface of the chemically strengthened crystallized glass to the depth of the compressive stress layer, and has tensile stress inside the chemically strengthened crystallized glass.

[0022] In some embodiments of this application, the chemically strengthened crystallized glass contains a lithium disilicate crystalline phase, the lithium disilicate crystalline phase having a larger mass fraction than other crystalline phases present in the chemically strengthened crystallized glass, and expressed in terms of oxide mole fraction, the composition of the central part of the chemically strengthened crystallized glass is as follows: SiO2: 55.00 mol%~65.00 mol%, Al2O3: 0.00 mol%~2.00 mol%, P2O5: 1.00 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 The composition of the central part of the chemically strengthened crystallized glass, expressed as the mole fraction of oxides, satisfies 2.00 ≤ SiO2 / Li2O ≤ 2.40, optionally 2.00 ≤ SiO2 / Li2O ≤ 2.30, and optionally 2.02 ≤ SiO2 / Li2O ≤ 2.20.

[0023] In some embodiments of this application, the composition of the central region of the chemically strengthened crystallized glass, expressed as the content of oxides in mole fraction, further satisfies 0.90 ≤ SiO2 + Li2O ≤ 0.96 and / or Al2O3 / SiO2 ≤ 0.030 and / or 0.31 ≤ ZrO2 / (CaO + ZrO2 + Al2O3) ≤ 1.50 and / or 0.10 ≤ ZrO2 / (100% - 3 × Li The equation satisfies (2O)≦0.60 and / or satisfies 0.034≦ZrO2 / SiO2≦0.100 and / or satisfies CaO+Al2O3≦0.065 and / or satisfies (CaO+Al2O3) / Li2O≦0.25 and / or satisfies 0.12≦(ZrO2-Na2O) / (SiO2-2×Li2O)≦6.40 and / or satisfies Na2O / SiO2≦0.05.

[0024] In some embodiments of this application, the composition of the central region of the chemically strengthened crystallized glass, expressed in mole fractions of oxides, is such that the SiO2 content is 60.00 mol% to 65.00 mol%, optionally 60.50 mol% to 64.00 mol%, and / or the Li2O content is 28.00 mol% to 31.00 mol%, optionally 29.00 mol% to 30.50 mol%, and / or the ZrO2 content is 3.20 mol% to 6.00 mol%, optionally ZrO The content of 2 is 4.00 mol% to 6.00 mol%, and / or the content of P2O5 is 1.50 mol% to 3.00 mol%, optionally the content of P2O5 is 1.50 mol% to 2.50 mol%, and / or the content of Na2O is 0.00 mol% to 1.00 mol%, optionally the content of Na2O is 0.00 mol% to 0.50 mol%, and / or the content of CaO is 0.00 mol% to 4.00 mol%, optionally the content of CaO is 0.00 mol% to 2.50 mol%.

[0025] In some embodiments of this application, the composition of the central region of the chemically strengthened crystallized glass, expressed in terms of the mole fraction of oxides, further includes Y2O3: 0.00 mol% to 1.00 mol%, La2O3: 0.00 mol% to 1.00 mol%, and Ta2O5: 0.00 mol% to 1.00 mol%.

[0026] In some embodiments of this application, the chemically strengthened crystallized glass has a DOL_0 of 0.18t to 0.25t, and optionally, a DOL_0 of 0.20t to 0.25t, where DOL_0 is the depth of the compressive stress layer and t is the thickness of the chemically strengthened crystallized glass. If the DOL_0 of the chemically strengthened crystallized glass is within the above range, that is, the chemically strengthened crystallized glass has a high compressive stress layer depth, which contributes to counteracting the energy that promotes crack propagation, and it can be guaranteed that the chemically strengthened crystallized glass has excellent fracture resistance and excellent deformation resistance.

[0027] In some embodiments of this application, the chemically strengthened crystallized glass has a |CT_AV| of 85 MPa to 200 MPa, optionally 90 MPa to 200 MPa, optionally 130 MPa to 200 MPa, where |CT_AV| is the absolute value of the mean tensile stress. If the |CT_AV| of the chemically strengthened crystallized glass is within the above range, that is, if the chemically strengthened crystallized glass has a relatively high tensile stress level, a relatively high surface stress level, and a relatively high surface compressive stress level, then more residual energy from drops and impacts can be offset, and it can be guaranteed that the chemically strengthened crystallized glass has excellent break resistance and excellent deformation resistance.

[0028] In some embodiments of this application, the chemically strengthened crystallized glass has a CT_LD of 50,000 MPa / mm to 100,000 MPa / mm, optionally 55,000 MPa / mm to 100,000 MPa / mm, optionally 65,000 MPa / mm to 100,000 MPa / mm, where CT_LD is the tensile stress linear density. If the CT_LD of the chemically strengthened crystallized glass is within the above range, that is, the tensile stress accumulated inside the chemically strengthened crystallized glass is relatively dense, the chemically strengthened crystallized glass has a relatively high surface stress level, and it can be guaranteed that the chemically strengthened crystallized glass has excellent fracture resistance and excellent deformation resistance.

[0029] In some embodiments of this application, the chemically strengthened crystallized glass has a |CT_CV| of 120 MPa to 320 MPa, optionally 135 MPa to 300 MPa, and optionally 160 MPa to 300 MPa. If the |CT_CV| of the chemically strengthened crystallized glass is within the above range, that is, if the chemically strengthened crystallized glass has a relatively high tensile stress level, a relatively high surface stress level, and a relatively high surface compressive stress level, then more residual energy from drops and impacts can be offset, and it can be guaranteed that the chemically strengthened crystallized glass has excellent break resistance and excellent deformation resistance.

[0030] In some embodiments of this application, the Vickers hardness of the chemically strengthened crystallized glass is 680 kgf / mm². 2 The above is an optional provision regarding the Vickers hardness of chemically strengthened crystallized glass, which is 700 kgf / mm². 2 ~800 kgf / mm 2 Therefore, if the Vickers hardness of the chemically strengthened crystallized glass falls within the above range, it can be guaranteed that the chemically strengthened crystallized glass has high hardness and excellent mechanical properties.

[0031] In some embodiments of this application, when the thickness of the chemically strengthened crystallized glass is 0.5 mm, the center of the main surface of the chemically strengthened crystallized glass is pressed with a metal indenter having a circular head with a diameter of 10 mm, and when the center of the main surface of the chemically strengthened crystallized glass is pressed with a load of 10 kgf, the amount of deformation of the point of force on the chemically strengthened crystallized glass in the direction of the applied force is 0.850 mm or less. When chemically strengthened crystallized glass is pressed, the smaller the amount of deformation, the better its deformation resistance. When it is used as a cover glass for a screen, the smaller the deformation when it is pressed or impacted, the lower the probability of it coming into contact with the inner glass screen, which helps to improve the problem of the inner glass screen failing due to the cover glass being impacted.

[0032] In some embodiments of this application, when the thickness of the chemically strengthened crystallized glass is 0.5 mm, the center of the main surface of the chemically strengthened crystallized glass is pressed with a metal indenter having a circular head with a diameter of 10 mm, and when the amount of deformation of the center of the main surface of the chemically strengthened crystallized glass along the direction of the applied force becomes 0.40 mm, the load applied to the center of the main surface of the chemically strengthened crystallized glass is 30 N or more. The greater the load that the chemically strengthened crystallized glass can withstand when a certain deformation occurs, the greater the load that can be offset by deformation when subjected to pressure or impact. Therefore, when it deforms and comes into contact with a glass inner layer screen, the load on the glass inner layer screen due to pressure or impact is reduced, and the possibility of the glass inner layer screen failing is reduced. When chemically strengthened crystallized glass that can withstand or offset relatively large loads is used as a cover glass, it contributes to improving the problem of glass inner layer screens failing due to the cover glass being subjected to impact or pressure.

[0033] This application provides a glass device comprising the crystallized glass or the chemically strengthened crystallized glass described above.

[0034] This application further provides electronic equipment comprising the crystallized glass or the chemically strengthened crystallized glass described above.

[0035] Beneficial effects: In this application, the crystallized glass in which the main crystalline phase is lithium disilicate has a specific composition and structure, and in particular satisfies a specific oxide content and specific oxide content relationship, thereby ensuring that the crystallized glass has high intrinsic strength and excellent optical performance. Furthermore, it can be guaranteed that the crystallized glass can be prepared into a chemically strengthened crystallized glass with a high stress level (e.g., having high CT_LD, |CT_AV|, DOL_0, etc.) and excellent deformation resistance by a chemical strengthening treatment method. When the chemically strengthened crystallized glass prepared using the crystallized glass according to this application is used as a cover glass for the screen of an electronic device, the problem in the prior art where the inner layer screen made of glass is prone to failure due to compression caused by deformation of the cover glass can be overcome.

[0036] To more clearly explain the technical concept of the embodiments of this application, the drawings used in the embodiments are briefly described below. The drawings described are merely examples of some embodiments of this application and do not limit the scope. Those skilled in the art can obtain other relevant drawings based on these drawings without employing the capabilities of the invention. [Brief explanation of the drawing]

[0037] [Figure 1] This is a DSC graph of the substrate glass according to Example 3. [Figure 2] This is the XRD pattern of the crystallized glass according to Example 3. [Figure 3] This graph shows the transmittance of the crystallized glass according to Example 3. [Figure 4] This graph shows the load deformation of chemically strengthened crystallized glass according to Example 3. [Figure 5] This graph shows the load deformation of chemically strengthened crystallized glass according to Comparative Example 3. [Modes for carrying out the invention]

[0038] The endpoints of the ranges and any values ​​disclosed herein are not limited to those specific ranges or values, and these ranges or values ​​should be understood to include values ​​close to those ranges or values. In the case of numerical ranges, one or more new numerical ranges can be obtained by combinations of the endpoints of each range, combinations of the endpoints of each range and individual specific values, and combinations of individual specific values, and these numerical ranges should also be considered to be specifically disclosed herein. The terms “optional” and “optional” mean “may or may not be included.”

[0039] In this specification, "and / or" is inclusive; for example, when using "A and / or B," it may have only A, only B, or both A and B.

[0040] Terminology and testing methods: Base glass: This refers to glass that has not undergone nucleation, crystallization, or strengthening treatments, and is also called foundation glass.

[0041] Crystallized glass, also known as glass ceramic, is a solid composite material containing both a glass phase and a crystalline phase (or microcrystalline phase), prepared by a controlled crystallization treatment applied to a base glass.

[0042] Chemically strengthened crystallized glass: This is a solid composite material obtained by chemically strengthening crystallized glass. During the chemical strengthening process, alkali metal ions with a large ionic radius (e.g., potassium ions or sodium ions) in the molten salt bath replace alkali metal ions with a small ionic radius (e.g., sodium ions or lithium ions) in the crystallized glass. This creates a volume difference due to ion exchange, resulting in compressive stress on the surface of the crystallized glass.

[0043] Main crystalline phase: This refers to the crystalline phase that has a higher weight content than other crystalline phases present in crystallized glass.

[0044] Main surface: This refers to the surface with the largest surface area in a glass block or glass sheet, such as the top or bottom surface of a cover glass.

[0045] Crystallinity: This refers to the percentage of the total mass of the crystalline phase or crystals in crystallized glass relative to the total mass of the crystallized glass, or it is also called the total content of the crystalline phase in the crystallized glass.

[0046] Refractive index: The ratio of the speed of light propagation in a vacuum to the speed of light propagation in the medium.

[0047] Transmittance: When light of a certain wavelength is shone on the surface of glass, reflection, absorption, and transmission of light occur, and the ratio of the intensity of transmitted light to the intensity of incident light is called transmittance.

[0048] SOC stands for photoelastic coefficient. Photoelasticity refers to the phenomenon where anisotropy occurs and birefringence appears in mainly transparent materials after they are subjected to force. By measuring the photoelastic coefficient and birefringence, the value of residual stress (in MPa) inside the material can be obtained.

[0049] CT_LD refers to the tensile stress linear density, with units of MPa / mm. After ion exchange is performed by placing crystallized glass in a molten salt bath, a compressive stress layer is formed on the surface of the crystallized glass, and a tensile stress layer is formed inside. For example, during chemical strengthening treatment, alkali metal ions with large radii in the molten salt bath and alkali metal ions with small radii in the crystallized glass exchange ions, thereby forming a compressive stress layer on the surface of the crystallized glass and a tensile stress layer inside the crystallized glass. In this application, CT_LD is calculated using the following formula. JPEG2026529934000002.jpg20153 Here, t is the thickness of the chemically strengthened crystallized glass in mm, DOL_0 is the depth of the compressive stress layer of the chemically strengthened crystallized glass in μm, and |CT_AV| is the absolute value of the average tensile stress of the chemically strengthened crystallized glass in MPa. In the calculation formula for tensile stress linear density, the data is substituted according to the above unit requirements and the calculation result is obtained, and the units themselves do not participate in the calculation.

[0050] |CT_CV|: This is the absolute value of the maximum tensile stress, in units of MPa. Specifically, it is the absolute value of the maximum value among all tensile stresses in the tensile stress layer, and was measured using the SLP-2000 stress meter.

[0051] |CT_AV|: Refers to the absolute value of the average tensile stress, in units of MPa. Specifically, it refers to the absolute value of the average value of all tensile stresses in the tensile stress layer, measured using the SLP-2000 stress meter.

[0052] DOL_0: This refers to the depth of the compressive stress layer, specifically the distance from any main surface of the chemically strengthened crystallized glass to a location near that surface where the compressive stress is zero, and is measured using the SLP-2000 stress meter.

[0053] b value: This value represents the yellow and blue tint. In this application, the optical b value is the transmitted light b value. When the optical b value is positive, the material is bluer.

[0054] Vickers hardness: A standard for measuring the hardness of materials, established in 1921 by Robert L. Smith and George E. Sandland of England at Vickers Ltd.

[0055] Upper limit temperature for crystal precipitation: This refers to the maximum temperature at which crystals will precipitate in the substrate glass. Above this temperature, crystal precipitation will cease in the substrate glass.

[0056] Glass thickness: Measured with a micrometer. In the thickness direction, the degree of ion exchange changes in a gradient from the surface to the center, and the total increase (mass) in the amount of Na-K and / or Li-Na exchange generally does not exceed 1.5% of the total sample mass. Therefore, the expansion effect in the thickness direction is extremely slight, and the thickness can be considered to change almost nothing. In other words, the change in the thickness of the crystallized glass before and after chemical strengthening is so small that it can be ignored.

[0057] Measurement of glass sheet dimensions: Measured using a two-dimensional measuring instrument (model number: Miyu MY-YXCL-4030).

[0058] XRD Measurement: The crystallized glass or chemically strengthened crystallized glass according to this application is crushed and ground to obtain a sample with a particle size of less than 75 μm. The sample obtained by grinding is measured using an X-ray diffractometer to obtain an XRD diffraction peak curve and XRD diffraction data. In this application, the X-ray diffractometer used is a Shimadzu XRD-6100, with 2θ = 10° to 60°, a scan speed of 0.2° / min, a work voltage of 40kV, and a work current of 30mA.

[0059] Determination of crystalline phase: XRD diffraction data is analyzed using the Jade software (JADE Standard 8.6) to determine the crystalline phase composition of the sample.

[0060] Determination of Crystallinity: The XRD measurement results (RAW format) are imported into Jade, an X-ray diffraction data analysis software, for fitting and calculation to determine the crystallinity of the sample. Specifically, the ratio of the peak area of ​​the fitted crystalline phase to the total peak area after fitting is defined as the crystallinity of the sample.

[0061] Determination of average grain size: Using the data obtained from XRD measurements, the average grain size of the sample can be calculated according to Scherrer's equation D = Kλ / (βcosθ). Here, λ is the X-ray wavelength, λ = 0.154056 nm, β is the diffraction peak full width at half maximum, K = 0.89, and θ is the Bragg diffraction angle. Specifically, curve fitting is performed on the RAW file output from the XRD instrument using Jade software, a fitting report is output by Jade, and based on the angle 2θ value and Peak FWHM value corresponding to each diffraction peak in the fitting report, the Peak FWHM value is converted to radians, β = (FWHM / 180 × 3.14), and then the grain size of each diffraction peak is calculated according to Scherrer's equation D = Kλ / (βcosθ), and the average value is calculated to obtain the average grain size of the sample.

[0062] Measurement of transmittance and optical b-value: Refer to the national standard "GB / T 7962.12-2010 Method for measuring colorless optical glass, Part 12: Spectral internal transmittance ratio" and measure the transmittance and b-value of the crystallized glass according to this application using a haze meter. Specifically, use a haze meter to measure the transmittance and b-value of five crystallized glass pieces from the same batch for light of different wavelengths. The average of the measured b-values ​​of the five crystallized glass pieces will be taken as the b-value result for the crystallized glass. The average of the transmittances of the five measured crystallized glass pieces at a wavelength of 550 nm will be calculated and taken as the transmittance result for the crystallized glass at a wavelength of 550 nm. In this application, the haze meter used for measurement is a Konica Minolta CM-3600A spectrophotometer, with a transmission-type light-receiving optical system, a planar diffraction grating as the spectral method, a wavelength range of 360 nm to 740 nm, a wavelength interval of 10 nm, four pulsed xenon lamps as the illumination source, an ambient temperature of 24°C, and an air humidity of 40%.

[0063] Density: In this application, the density of the crystallized glass is measured using an electronic balance for density measurement, SD-200L, manufactured by ALFA MIRAGE, Inc. of Japan.

[0064] Refractive index: In this application, the refractive index of the crystallized glass is measured using a WYA-2WAJ Abbe refractometer.

[0065] Expansion softening point temperature: The sample is processed into a cylindrical shape with a diameter of 5.5 mm and a length of 20 mm. A thermal expansion meter, LINSEIS L75VD1000, is used to measure the thermal expansion coefficient of the sample, and a measurement curve is output. When this curve begins to show a downward trend as the temperature rises, the temperature corresponding to the starting point of the downward trend in the curve is recorded as the expansion softening point temperature of the sample.

[0066] Young's modulus: The Young's modulus of crystallized glass is measured using the UMS-100 ultrasonic material evaluation system with sound waves.

[0067] Upper limit temperature for crystal precipitation: The substrate glass is crushed into small pieces and spread onto a long, narrow quartz tray. A JKZC-XJY01 type temperature gradient furnace is set to a temperature range such as 1050°C to 1225°C, and the temperature is measured at at least six temperature measurement points from the high temperature side to the low temperature side within each temperature range. After the temperature gradient furnace reaches the set temperature range, the long, narrow quartz tray containing the samples is placed in the temperature gradient furnace, with the six temperature measurement points corresponding to six glass samples on the long, narrow quartz tray. The long, narrow quartz tray is kept at a constant temperature in the temperature gradient furnace for 60 to 70 minutes, and then removed. The glass samples at each position in the long, narrow quartz tray are observed using a microscope or magnifying glass. If devitrification or clouding occurs in the glass samples, it is determined that crystal precipitation has occurred in the glass samples at that location. If the glass samples are transparent, it is determined that crystal precipitation has not occurred in the glass samples at that location. The upper limit temperature range for crystal precipitation lies between the temperature measurement point corresponding to the transparent sample and the adjacent temperature measurement point corresponding to the sample that has devitrified or become cloudy. The average value of these two temperature measurement points is defined as the upper limit temperature for crystal precipitation. If crystal precipitation occurs in all or none of the glass samples in the elongated quartz tray within the temperature range set by the temperature gradient furnace, the temperature range of the temperature gradient furnace is reset, and the upper limit temperature for crystal precipitation of the glass samples is measured again.

[0068] Measurement of Vickers hardness: Chemically strengthened crystallized glass is prepared into small glass sheets with dimensions of 50 mm x 50 mm x 0.5 mm in length, width, and thickness. A glass test piece with a clean surface and no visible damage such as scratches, dents, or cracks is selected as the measurement sample, and the Vickers hardness is measured using a Vickers hardness tester. The Vickers hardness tester used in this application is a digital display small-load Vickers hardness tester, model number VTD405, manufactured by Beijing Kewei Technology Co., Ltd. The measurement conditions are a load of 300 gf, a loading time of 10 s, and the effectiveness of the indentation conforms to the standard of "GB / T 37900-2019 Test Method for Hardness and Fracture Toughness of Ultrathin Glass - Small Load Vickers Hardness Indentation Method". Three different positions are selected on the surface of the same measurement sample and measured. The average value of the three measurement results is taken as the Vickers hardness result of the measurement sample.

[0069] Synchronized thermal analysis test: After crushing the substrate glass, the sample was ground and passed through a 200-mesh sieve. Approximately 20 mg of the sample was weighed and heated from room temperature to 1100°C at a heating rate of 10°C / min in a nitrogen gas protective atmosphere using a differential thermal analyzer, and the DSC measurement curve of the sample was obtained. The differential thermal analyzer used in this application is a Mettler-Toledo TGA / DSC3+ thermogravimetric-synchronous thermal analyzer, the standard substance used in the test is α-Al2O3 powder, the container for the sample is a platinum crucible, and the installation environment of the apparatus is a temperature of 24°C and an air humidity of less than 40%.

[0070] Stress Test: In this application, the |CT_CV|, DOL_0, and |CT_AV| of chemically strengthened crystallized glass are measured using an SLP 2000 stress meter. The parameters of the stress meter are a light source wavelength of 518 nm, a SOC (photoelastic coefficient) of 25.5, a refractive index set based on the refractive index of the sample being measured, and an exposure time of 300 μsec. The value of the tensile stress linear density (CT_LD) of the chemically strengthened crystallized glass is then calculated using the above formula for calculating tensile stress linear density.

[0071] Measurement of deformation: The deformation is measured using a unit strength measurement method. Specifically, the chemically strengthened crystallized glass is placed in the lower ring of a tensile strength testing machine (LT_850A), the circular head of the pressure rod is brought into contact with the center of the main surface of the chemically strengthened crystallized glass, the movement speed of the pressure rod is set to 50 mm / min, the test software is started and the test is started. The test software records the applied load and the corresponding deformation curve, and the deformation of the chemically strengthened crystallized glass under a 10 kgf load is read. The deformation here refers to the displacement of the main surface of the chemically strengthened crystallized glass in the direction of the force applied from the point of application. The pressure rod used in this measurement method is a metal pressure rod with a diameter of 10 mm, and the circular head of the pressure rod is hemispherical in shape with a diameter of 10 mm.

[0072] Measurement of the load applied when a certain amount of deformation occurs: Here, "applied load" refers to the load required at the point of application of force for the main surface of the chemically strengthened crystallized glass to undergo a corresponding amount of deformation along the direction of the applied force.

[0073] The method for measuring the "load received" is the same as the method for measuring the deformation amount, and is measured using the unit strength measurement method. Specifically, a chemically strengthened crystallized glass is placed in the lower ring of a tensile strength testing machine (LT_850A), the circular head of the pressure rod is brought into contact with the center of the main surface of the chemically strengthened crystallized glass, the movement speed of the pressure rod is set to 50 mm / min, the test software is started and the test is started, the test software records the applied load and the corresponding deformation curve, and when the deformation amount of the chemically strengthened crystallized glass sample is 0.40 mm, the required applied load is read, and the center of the main surface of the chemically strengthened crystallized glass when the deformation amount is 0.40 mm is recorded as the "load received" (or may be called the load offset during deformation). The pressure rod used in this measurement method is a metal pressure rod with a diameter of 10 mm, and the circular head of the pressure rod is hemispherical in shape with a diameter of 10 mm.

[0074] It is not limited to theory, but it is presumed that the process of glass deformation is a process of canceling out stress. When the cover glass is subjected to a force and undergoes a certain deformation, the greater the stress that is canceled out, the smaller the force transmitted to the inner glass screen under equivalent impact conditions. In other words, the less pressure the inner glass screen experiences, which helps to avoid the problem of the inner glass screen failing. Similarly, the smaller the amount of deformation that occurs when the cover glass is subjected to a certain force, the less likely it is that pressure will be applied to the inner glass screen, and the less likely it is that the inner glass screen will fail.

[0075] In view of this, this application provides crystallized glass, chemically strengthened crystallized glass, and applications thereof, which have high mechanical strength, excellent optical performance and excellent deformation resistance, and whose main crystalline phase is lithium disilicate. The crystallized glass according to this application can be chemically strengthened to obtain a chemically strengthened crystallized glass with a high stress level after chemical strengthening treatment.

[0076] In some embodiments of this application, crystallized glass is provided, the crystallized glass containing a lithium disilicate crystalline phase, the lithium disilicate crystalline phase having a larger mass fraction than other crystalline phases present in the crystallized glass, and expressed in terms of the mole fraction of oxides, the composition of the crystallized glass is: SiO2: 55.00 mol%~65.00 mol%, Al2O3: 0.00 mol%~2.00 mol%, P2O5: 1.00 mol%~3.00 mol%, ZrO2: 2.00 mol%~6.00 mol%, MgO: 0.00 mol%~2.00 mol The composition of the crystallized glass contains 0.00 mol% to 2.00 mol% of each oxide, with ZnO: 0.00 mol% to 3.00 mol%, Na2O: 0.00 mol% to 3.00 mol%, K2O: 0.00 mol% to 1.00 mol%, Li2O: 27.00 mol% to 32.00 mol%, CaO: 0.00 mol% to 5.00 mol%, B2O3: 0.00 mol% to 1.00 mol%, and SrO: 0.00 mol% to 2.00 mol%, expressed as the mole fraction of each oxide in the composition of the crystallized glass, satisfying the condition 2.00 ≤ SiO2 / Li2O ≤ 2.40.

[0077] In this application, by optimizing the glass composition, for example, by employing a glass with a relatively high lithium content, a relatively high zirconium content, and a relatively low aluminum content, and by ensuring that each component satisfies a specific content relationship and exhibits a synergistic effect between the components, it is possible to ensure the precipitation of a lithium disilicate crystal phase with a desired content and suppress the precipitation of other crystal phases (e.g., petalite crystal phase), thereby contributing to the acquisition of a crystallized glass with lithium disilicate as the main crystal phase that has high intrinsic strength and excellent optical performance, and on the other hand, contributing to ensuring that the crystallized glass has a specific composition and structure, thereby ensuring that a chemically strengthened crystallized glass with a high stress level and excellent deformation resistance can be obtained after chemical strengthening treatment.

[0078] In some embodiments, expressed as the mole fraction of oxides, the SiO2 / Li2O value in the crystallized glass may be, for example, 2.00, 2.01, 2.02, 2.05, 2.06, 2.07, 2.08, 2.09, 2.10, 2.11, 2.12, 2.13, 2.14, 2.15, 2.16, 2.17, 2.18, 2.19, 2.20, 2.25, 2.30, or 2.40, or may be a value within a range configured with any two of the above specific values ​​as endpoints, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance can be obtained in this application. In specific embodiments, any of the above ranges may be combined with any other range, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance can be obtained in this application. Adopting a composition that satisfies this relation contributes to reducing the size of crystal grains in crystallized glass, improving the optical performance of crystallized glass, ensuring the precipitation of lithium disilicate crystals, which are the main crystalline phase, effectively reducing the precipitation of other crystalline phases (e.g., petalite crystals), ensuring that crystallized glass acquires relatively high intrinsic strength, and contributing to the acquisition of a high stress level after chemical strengthening treatment of crystallized glass.

[0079] In this application, SiO2 is an oxide for forming a glass network structure and is an essential component for constituting the glass network structure. Furthermore, SiO2 is also an essential component for forming the lithium disilicate (Li2Si2O5) crystalline phase. By appropriately increasing the SiO2 content, the structural stability and mechanical strength of the glass can be improved, and the precipitation of the lithium disilicate crystalline phase with the desired content can be guaranteed. If the SiO2 content is too high, the viscosity of the base glass increases, making it difficult to melt and prepare the glass, and reducing the moldability of the base glass. For this reason, in order to ensure a relatively good moldability and crystallization effect, the mole fraction of SiO2 is kept between 55.00 mol% and 65.00 mol%, and optionally between 60.00 mol% and 65.00 mol%.

[0080] In some embodiments, the crystallized glass may contain SiO2 in amounts of 55.00 mol% to 65.00 mol%, 58.00 mol% to 64.00 mol%, 60.00 mol% to 65.00 mol%, 61.00 mol% to 64.00 mol%, 60.50 mol% to 64.00 mol%, 61.50 mol% to 63.50 mol%, 62.00 mol% to 64.00 mol%, 63.00 mol% to 64.00 mol%, or 63.00 mol% to 65.00 mol%. In some embodiments, in crystallized glass, 55.00 mol%, 56.00 mol%, 57.00 mol%, 58.00 mol%, 59.00 mol%, 60.00 mol%, 61.00 mol%, 62.00 mol%, 63.00 mol%, 64.00 mol%, 62.55 mol%, 62.58 mol%, 61.82 mol%, 61.72 mol%, 61.87 mol%, 61.76 mol%, 62.59 mol%, and 61. The SiO2 may contain 15 mol%, 61.25 mol%, 61.06 mol%, 63.17 mol%, 62.77 mol%, 63.39 mol%, 63.17 mol%, 63.16 mol%, 62.01 mol%, or 65.00 mol%, or may contain SiO2 within a numerical range formed with any two of the above specific values ​​as endpoints, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0081] In this application, Al2O3 is an optional component. The addition of an appropriate amount of Al2O3 contributes to the stabilization of the glass network structure and to some extent promotes ion exchange during the chemical strengthening process. However, too much Al2O3 increases the viscosity of the glass and easily leads to the precipitation of other crystalline phases, such as petalite, reducing the content of the lithium disilicate crystalline phase and affecting the interlocked structure of lithium disilicate. For this reason, the mole fraction of Al2O3 is kept within the range of 0.00 mol% to 2.00 mol%.

[0082] Through several mechanisms, crystallized glass may contain Al2O3 in amounts of 0.00mol% to 2.00mol%, 0.00mol% to 1.60mol%, 0.00mol% to 1.00mol%, 0.50mol% to 1.60mol%, 0.50mol% to 1.00mol%, 0.00mol% to 0.50mol%, 1.20mol% to 1.60mol%, 0.00mol% to 1.30mol%, 0.00mol% to 1.20mol%, or 1.00mol% to 2.00mol%. In some embodiments, the crystallized glass may contain 0.00 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.80 mol%, 1.55 mol%, 1.38 mol%, 1.41 mol%, 1.37 mol%, 1.39 mol%, 1.43 mol%, 1.23 mol%, 1.42 mol%, or 2.00 mol% of Al2O3, or Al2O3 within a numerical range defined by any two of the above specific values ​​as endpoints, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance can be obtained. In specific embodiments, any of the above ranges can be combined with any other range, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance can be obtained.

[0083] In this application, P2O5 is an essential component as a nucleating agent. If the content is too low or too high, the crystallization effect will be poor, impairing the optical performance of the resulting crystallized glass. For example, the transparency of the crystallized glass will decrease. For this reason, the mole fraction of P2O5 is kept within 1.00 mol% to 3.00 mol%, and optionally between 1.50 mol% and 2.50 mol%.

[0084] In several mechanisms, in crystallized glass, 1.00 mol%~3.00 mol%, 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. It may contain P2O5 in amounts of 60 mol% to 2.50 mol%, 1.70 mol% to 2.30 mol%, 1.80 mol% to 2.00 mol%, 2.00 mol% to 3.00 mol%, 1.80 mol% to 1.90 mol%, 1.60 mol% to 1.90 mol%, 1.70 mol% to 1.90 mol%, 1.75 mol% to 1.95 mol%, or 1.50 mol% to 2.00 mol%. In some embodiments, the crystallized glass may contain 1.00 mol%, 1.20 mol%, 1.50 mol%, 1.70 mol%, 1.75 mol%, 1.80 mol%, 1.85 mol%, 1.95 mol%, 2.00 mol%, 2.10 mol%, 2.20 mol%, 2.30 mol%, 2.40 mol%, 2.50 mol%, 2.60 mol%, 2.80 mol%, 2.06 mol%, 1.87 mol%, 1.88 mol%, 1.86 mol%, 1.83 mol%, 1.89 mol%, 1.74 mol%, 1.51 mol%, or 3.00 mol% of P2O5, or a value of P2O5 within a numerical range formed with any two of the above specific values ​​as endpoints, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges can be combined with any other ranges, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0085] In this application, ZrO2 is an intermediate oxide in glass formation, mainly used as a nucleating agent and toughness improver to reduce the crystal grain size and enhance the toughness of the crystallized glass. However, if the content is too high, it becomes difficult to melt and prepare the base glass, for example, a large amount of white precipitate is formed in the base glass, which is unfavorable for obtaining crystallized glass with excellent optical properties. For this reason, the mole fraction of ZrO2 is kept within 2.00 mol% to 6.00 mol%, and optionally between 3.20 mol% and 6.00 mol%.

[0086] In some embodiments, the crystallized glass may contain ZrO2 in amounts of 2.00 mol% to 6.00 mol%, 2.30 mol% to 5.80 mol%, 2.50 mol% to 5.50 mol%, 2.80 mol% to 5.30 mol%, 2.90 mol% to 5.10 mol%, 3.00 mol% to 5.50 mol%, 3.10 mol% to 4.80 mol%, 4.80 mol% to 6.00 mol%, 4.00 mol% to 6.00 mol%, 3.20 mol% to 5.30 mol%, 3.50 mol% to 5.00 mol%, 3.50 mol% to 5.80 mol%, 4.00 mol% to 5.00 mol%, or 3.20 mol% to 6.00 mol%. In some embodiments, in crystallized glass, 2.00 mol%, 2.30 mol%, 2.50 mol%, 2.70 mol%, 2.90 mol%, 3.00 mol%, 3.10 mol%, 3.30 mol%, 3.50 mol%, 4.00 mol%, 4.50 mol%, 5.00 mol%, 5.50 mol%, 5.80 mol%, 2.58 mol%, 4.68 mol%, 4.66 mol%, 4.61 mol%, 3.16 mol%, 3.7 The ZrO2 may contain 2 mol%, 4.21 mol%, 4.57 mol%, 5.10 mol%, 5.54 mol%, 4.72 mol%, 2.18 mol%, 2.36 mol%, 3.31 mol%, 4.63 mol%, or 6.00 mol%, or ZrO2 within a numerical range formed with any two of the above specific values ​​as endpoints, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance can be obtained for this application. In specific embodiments, any of the above ranges may be combined with any other range, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance can be obtained for this application.

[0087] In this application, CaO is a selectable component as a network-modifying oxide for glass formation. An appropriate amount of CaO can reduce the high-temperature viscosity of the glass, improve its density, contribute to glass shaping, strengthen the network structure, and improve stress gain during the chemical strengthening process. However, too much CaO can cause a rapid decrease in the crystallinity of the glass, impairing its intrinsic strength. Therefore, the mole fraction of CaO should be kept between 0.00 mol% and 5.00 mol%.

[0088] Through several mechanisms, crystallized glass may contain CaO in amounts of 0.00mol% to 5.00mol%, 0.10mol% to 4.00mol%, 0.00mol% to 2.50mol%, 0.50mol% to 3.80mol%, 0.00mol% to 4.00mol%, 0.80mol% to 2.00mol%, 0.00mol% to 1.60mol%, 0.00mol% to 1.00mol%, 1.50mol% to 4.00mol%, 0.00mol% to 2.00mol%, 1.00mol% to 4.00mol%, or 0.10mol% to 5.00mol%. In some embodiments, the crystallized glass may contain 0.00 mol%, 0.10 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.80 mol%, 2.00 mol%, 2.50 mol%, 3.00 mol%, 4.00 mol%, 3.72 mol%, 0.94 mol%, 0.92 mol%, 0.93 mol%, 1.83 mol%, 2.67 mol%, or 5.00 mol% of CaO, or a value of CaO within a numerical range formed with any two of the above specific values ​​as endpoints, as long as a crystallized glass or chemically strengthened crystallized glass having the performance desired in this application can be obtained. In specific embodiments, any of the above ranges can be combined with any other ranges, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0089] In this application, Li2O is an essential component, a network-modifying oxide for glass formation, providing free oxygen, improving the viscosity of the glass, and promoting the melting and clarification of the molten glass. It is also one of the main components for forming lithium disilicate crystals, and Li2O can provide alkali metal lithium ions for ion exchange with large-radius ions in the molten salt bath, making it an important factor influencing the stress level that can be achieved in chemically strengthened crystallized glass. However, if there is too much Li2O, the stability of the glass crystallization process decreases, and consequently, other undesirable crystalline phases precipitate, reducing the optical performance of the crystallized glass. For this reason, the mole fraction of Li2O is kept between 27.00 mol% and 32.00 mol%, and optionally between 28.00 mol% and 31.00 mol%.

[0090] In some embodiments, the crystallized glass may contain 27.00 mol% to 32.00 mol%, 27.50 mol% to 31.00 mol%, 27.00 mol% to 30.00 mol%, 27.50 mol% to 29.50 mol%, 28.00 mol% to 31.00 mol%, 28.50 mol% to 31.00 mol%, 29.00 mol% to 30.50 mol%, or 29.50 mol% to 32.00 mol% of Li2O. In some embodiments, the crystallized glass may contain 27.00 mol%, 27.50 mol%, 28.00 mol%, 28.50 mol%, 29.00 mol%, 29.50 mol%, 30.00 mol%, 30.50 mol%, 31.00 mol%, 31.50 mol%, 27.54 mol%, 28.59 mol%, 29.52 mol%, 29.08 mol%, 29.80 mol%, 29.93 mol%, 29.30 mol%, 31.51 mol%, 30.22 mol%, 29.66 mol%, 29.25 mol%, or 32.00 mol% of Li2O, or may contain Li2O in a value within a numerical range formed with any two of the above specific values ​​as endpoints, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges can be combined with any other ranges, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0091] In this application, MgO is a selectable component. By using an appropriate amount of MgO, the glass phase component in the crystallized glass can be adjusted. However, if there is too much MgO, it will impair crystal growth and damage the crystalline phase structure of the crystallized glass. For this reason, the mole fraction of MgO should be kept between 0.00 mol% and 2.00 mol%.

[0092] Through several mechanisms, crystallized glass may contain MgO in amounts of 0.00mol% to 2.00mol%, 0.00mol% to 1.60mol%, 0.50mol% to 1.60mol%, 0.80mol% to 1.50mol%, 0.00mol% to 1.00mol%, 0.00mol% to 0.50mol%, 0.10mol% to 1.10mol%, 0.10mol% to 1.50mol%, or 0.00mol% to 1.40mol%. In some embodiments, the crystallized glass may contain 0.00 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.34 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.80 mol%, or 2.00 mol% of MgO, or MgO in a value within a numerical range formed with any two of the above specific values ​​as endpoints, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges can be combined with any other range, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0093] In this application, ZnO is an optional component for the network intermediate structure. An appropriate amount of ZnO can combine with free oxygen to adjust the glass structure, and can remain in the glass phase of the crystallized glass, increasing the viscosity of the glass. However, too much ZnO impairs crystal growth and damages the crystalline phase structure of the crystallized glass. For this reason, the mole fraction of ZnO should be kept between 0.00 mol% and 2.00 mol%.

[0094] Through several mechanisms, crystallized glass may contain ZnO in amounts of 0.00mol% to 2.00mol%, 0.00mol% to 1.70mol%, 0.50mol% to 1.60mol%, 0.80mol% to 1.50mol%, 0.00mol% to 1.00mol%, 0.00mol% to 0.50mol%, 0.10mol% to 1.10mol%, 0.10mol% to 1.50mol%, or 0.00mol% to 1.40mol%. In some embodiments, the crystallized glass may contain 0.00 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.67 mol%, 1.80 mol%, or 2.00 mol% of ZnO, or may contain ZnO in a value within a numerical range formed with any two of the above specific values ​​as endpoints, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges can be combined with any other range, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0095] In this application, Na2O is a selectable component as a network-modifying oxide. An appropriate amount of Na2O can provide free oxygen, improve the viscosity of the glass, promote the melting and clarification of the molten glass, and adjust the rate of chemical strengthening. However, if there is too much Na2O, the degree of crystallinity of the crystallized glass will decrease and impair the chemical strengthening effect. For this reason, the mole fraction of Na2O should be kept between 0.00 mol% and 3.00 mol%.

[0096] Through several mechanisms, crystallized glass may contain Na2O in amounts of 0.00mol% to 3.00mol%, 0.00mol% to 2.80mol%, 0.00mol% to 1.00mol%, 0.10mol% to 2.70mol%, 0.50mol% to 1.60mol%, 0.60mol% to 1.00mol%, 2.50mol% to 3.00mol%, or 0.00mol% to 0.50mol%. In some embodiments, the crystallized glass may contain 0.00 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.80 mol%, 2.00 mol%, 2.50 mol%, 2.60 mol%, or 3.00 mol% of Na2O, or Na2O in a range of values ​​within a numerical range formed with any two of the above specific values ​​as endpoints, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges can be combined with any other range, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0097] In this application, K2O is a selectable component as a glass network modifier oxide. An appropriate amount of K2O can provide free oxygen and increase the oxygen-to-silicon ratio in the glass structure. However, too much K2O impairs the glass network structure, optical performance, thermal stability, chemical stability, mechanical strength, and weather resistance of the glass. Therefore, the mole fraction of K2O should be kept between 0.00 mol% and 1.00 mol%.

[0098] In some embodiments, the crystallized glass may contain K2O in amounts of 0.00mol% to 1.00mol%, 0.50mol% to 1.00mol%, 0.00mol% to 0.50mol%, 0.85mol% to 1.00mol%, or 0.00mol% to 0.15mol%. In some embodiments, the crystallized glass may contain K2O in amounts of 0.00mol%, 0.15mol%, 0.50mol%, 0.70mol%, 0.85mol%, 0.92mol%, 0.95mol%, or 1.00mol%, or K2O in values ​​within a numerical range formed with any two of the above specific values ​​as endpoints, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges can be combined with any other range, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0099] In this application, B2O3 is an optional component. An appropriate amount of B2O3 contributes to improving the shaping and thermal bending effects of the glass as a flux and / or softener. However, if there is too much B2O3, the crystal precipitation process becomes uncontrollable, and the optical performance of the crystallized glass deteriorates. For this reason, the mole fraction of B2O3 should be kept between 0.00 mol% and 1.00 mol%.

[0100] In some embodiments, the crystallized glass may contain B2O3 in the ranges of 0.00mol% to 1.00mol%, 0.00mol% to 0.50mol%, 0.50mol% to 1.00mol%, 0.10mol% to 0.85mol%, 0.85mol% to 1.00mol%, or 0.25mol% to 0.75mol%. In some embodiments, the crystallized glass may contain B2O3 in the ranges of 0.00mol%, 0.10mol%, 0.25mol%, 0.50mol%, 0.60mol%, 0.65mol%, 0.70mol%, 0.75mol%, 0.85mol%, 0.95mol%, or 1.00mol%, or B2O3 in the ranges of values ​​within a numerical range formed with any two of the above specific values ​​as endpoints, as long as a crystallized glass or chemically strengthened crystallized glass having the performance desired in this application can be obtained. In specific embodiments, any of the above ranges can be combined with any other ranges, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0101] In this application, SrO is a selectable component as an alkaline earth metal oxide. An appropriate amount of SrO can adjust the glass phase composition in the crystallized glass, contributing to an increase in density and Young's modulus of the crystallized glass. It also contributes to a decrease in the expansion softening point of the crystallized glass, which helps the crystallized glass to be heat-bent and formed as 3D curved crystallized glass. If the amount of SrO is excessive, the optical performance of the crystallized glass deteriorates, so the mole fraction of SrO should be kept within the range of 0.00 mol% to 2.00 mol%.

[0102] Through several mechanisms, crystallized glass may contain SrO in amounts of 0.00mol% to 2.00mol%, 0.10mol% to 2.00mol%, 0.00mol% to 1.00mol%, 0.10mol% to 1.00mol%, 0.30mol% to 1.90mol%, 0.40mol% to 1.20mol%, 1.20mol% to 2.00mol%, 0.00mol% to 0.30mol%, 0.85mol% to 1.40mol%, 0.85mol% to 1.90mol%, 0.50mol% to 1.20mol%, or 1.00mol% to 2.00mol%. In some embodiments, the crystallized glass may contain 0.00 mol%, 0.30 mol%, 0.46 mol%, 0.50 mol%, 0.70 mol%, 0.85 mol%, 0.92 mol%, 0.95 mol%, 1.00 mol%, 1.10 mol%, 1.20 mol%, 1.30 mol%, 1.40 mol%, 1.50 mol%, 1.60 mol%, 1.80 mol%, 1.83 mol%, or 2.00 mol% of SrO, or may contain SrO in values ​​within a numerical range formed with any two of the above specific values ​​as endpoints, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance can be obtained. In specific embodiments, any of the above ranges can be combined with any other range, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance can be obtained.

[0103] Through several mechanisms, and expressed in terms of the mole fraction of oxides, the composition of crystallized glass includes SiO2: 60.00 mol% to 65.00 mol%, Al2O3: 0.00 mol% to 2.00 mol%, P2O5: 1.50 mol% to 3.00 mol%, ZrO2: 2.00 mol% to 6.00 mol%, MgO: 0.00 mol% to 2.00 mol%, ZnO: 0.00 mol% to 2.00 mol%, Na2O: 0.00 mol% to 3.00 mol%, K2O: 0.00 mol% to 1.00 mol%, Li2O: 27.00 mol% to 32.00 mol%, CaO: 0.00 mol% to 4.00 mol%, B2O3: 0.00 mol% to 1.00 mol%, and SrO: 0.00 mol% to 2.00 mol%. By satisfying the above composition, crystallized glass can be guaranteed to have high intrinsic strength and excellent optical properties, as well as chemical strengthening effects. After chemical strengthening treatment, crystallized glass can acquire a relatively high stress level, ensuring relatively high mechanical strength and excellent deformation resistance.

[0104] In some embodiments, the composition of the crystallized glass according to this application may include other components in addition to the above composition. For example, in some specific embodiments, the composition of the crystallized glass, expressed in terms of the mole fraction of oxides, further includes Y2O3: 0.00 mol% to 1.00 mol%, La2O3: 0.00 mol% to 1.00 mol%, and Ta2O5: 0.00 mol% to 1.00 mol%.

[0105] In this application, selectively adding appropriate amounts of Y2O3, La2O3, or Ta2O5 contributes to increasing the density and Young's modulus of the crystallized glass. However, this may increase the refractive index of the crystallized glass and potentially degrade its optical performance. Therefore, the mole fraction of Y2O3, La2O3, or Ta2O5 should be kept within the range of 0.00 mol% to 1.00 mol%.

[0106] In some embodiments, the mole fraction of Y2O3, La2O3, or Ta2O5 in the crystallized glass may be 0.00 mol%, 0.10 mol%, 0.20 mol%, 0.30 mol%, 0.40 mol%, 0.46 mol%, 0.50 mol%, 0.53 mol%, 0.60 mol%, 0.70 mol%, 0.75 mol%, 0.80 mol%, 0.85 mol%, 0.90 mol%, 0.95 mol%, or 1.00 mol%, or may be a value within a range configured with any two of the above specific values ​​as endpoints, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0107] In some mechanisms, when expressed in terms of the mole fraction of oxides, the composition of the crystallized glass is as follows: SiO2: 60.50 mol%~64.00 mol%, Al2O3: 0.00 mol%~2.00 mol%, P2O5: 1.50 mol%~2.50 mol%, ZrO2: 3.20 mol%~6.00 mol%, MgO: 0.00 mol%~2.00 mol%, ZnO: 0.00 mol%~2.00 mol%, Na2O: 0.00 mol%~1.0 The composition includes 0 mol%, K2O: 0.00 mol%~1.00 mol%, Li2O: 28.00 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%, and Ta2O5: 0.00 mol%~1.00 mol%. By satisfying the above composition, the crystallized glass contributes to the preparation of chemically strengthened crystallized glass with a high stress level, and contributes to ensuring that the prepared chemically strengthened crystallized glass has excellent mechanical strength and deformation resistance.

[0108] In some embodiments of this application, the composition of the crystallized glass satisfies 0.90 ≤ SiO2 + Li2O ≤ 0.96, expressed as the mole fraction of each oxide in the composition of the crystallized glass (where the mole fraction is expressed in decimal form, i.e., 0.90 ≤ SiO2 + Li2O ≤ 0.96 is equivalent to 90 mol% ≤ SiO2 + Li2O ≤ 96 mol%. Other similar expressions can be understood in the same way). Adopting a composition that satisfies this relationship contributes to ensuring the precipitation of lithium disilicate crystals of a desired content in the crystallized glass, effectively reducing the precipitation of other crystals (e.g., petalite crystals), ensuring that the crystallized glass acquires relatively high intrinsic strength and optical performance, contributing to the acquisition of a high stress level after chemical strengthening treatment of the crystallized glass, and contributing to ensuring that the substrate glass does not devitrify when heat-treated to prepare the crystallized glass, or that the substrate glass does not devitrify during the melting and preparation process. In some embodiments, the SiO2+Li2O value may be, for example, 0.900, 0.904, 0.905, 0.910, 0.915, 0.920, 0.925, 0.930, 0.935, 0.940, 0.945, 0.950, or 0.960, or may be a value within a range configured with any two of the above specific values ​​as endpoints, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0109] In some embodiments of this application, the composition of the crystallized glass is further satisfied by Al2O3 / SiO2 ≤ 0.030, expressed as the mole fraction of each oxide in the composition of the crystallized glass. By adjusting the content relationship of Al2O3 and SiO2, the network structure of the glass is stabilized, and it contributes to ensuring the formation of a desired crystalline phase structure, and to the crystallized glass acquiring a high stress level after chemical strengthening treatment, and therefore, to the crystallized glass acquiring high mechanical strength performance and excellent deformation resistance. In some embodiments, the value of Al2O3 / SiO2 may be, for example, 0, 0.005, 0.010, 0.015, 0.020, 0.025 or 0.030, or a value within a range configured with any two of the above specific values ​​as endpoints, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance can be obtained in this application. In specific embodiments, any of the above ranges may be combined with any other range, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance can be obtained in this application.

[0110] In some embodiments of this application, the composition of the crystallized glass satisfies the following conditions in terms of the content of each oxide in the composition of the crystallized glass, expressed as mole fraction: 0.31 ≤ ZrO2 / (CaO + ZrO2 + Al2O3) ≤ 1.50, optionally 0.32 ≤ ZrO2 / (CaO + ZrO2 + Al2O3) ≤ 1.20, and optionally 0.36 ≤ ZrO2 / (CaO + ZrO2 + Al2O3) ≤ 1.10. By adjusting the content relationships of CaO, ZrO2, and Al2O3, which are components that have the effect of strengthening or improving the toughness of the glass structure, it is possible to better exert the effects of each component, thereby ensuring high intrinsic strength and high stress levels after strengthening of the crystallized glass, and thus contributing to the crystallized glass acquiring high mechanical strength performance and excellent deformation resistance. In some embodiments, the value of ZrO2 / (CaO+ZrO2+Al2O3) may be, for example, 0.31, 0.32, 0.34, 0.36, 0.37, 0.33, 0.83, 0.77, 0.67, 0.69, 0.62, 0.75, 0.59, 0.79, 0.80, 1.00, 0.35, 0.66, 0.50, 0.70, 0.40, 0.60, 0.90, 1.10, 1.20, 1.30, 1.40, or 1.50, or a value within a range configured with any two of the above specific values ​​as endpoints, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0111] In some embodiments of this application, the composition of the crystallized glass, expressed as the mole fraction of each oxide in the composition of the crystallized glass, further satisfies 0.10 ≤ ZrO2 / (100% - 3 × Li2O) ≤ 0.60, optionally 0.12 ≤ ZrO2 / (100% - 3 × Li2O) ≤ 0.52, and optionally 0.16 ≤ ZrO2 / (100% - 3 × Li2O) ≤ 0.50. By adjusting the content of ZrO2 and Li2O to satisfy specific content relationships, the crystallized glass can form a desired crystalline phase structure, contributing to the assurance of excellent optical performance, and can better exert the nucleation and / or toughness-enhancing effects of ZrO2, ensuring that the crystallized glass has high intrinsic strength, and thus contributing to the crystallized glass acquiring high mechanical strength performance and excellent deformation resistance. In some embodiments, the value of ZrO2 / (100%-3×Li2O) may be, for example, 0.10, 0.12, 0.15, 0.33, 0.44, 0.40, 0.25, 0.35, 0.41, 0.37, 0.46, 0.48, 0.39, 0.13, 0.43, 0.42, 0.50, 0.52, 0.56, or 0.60, or may be a value within a range formed with any two of the above specific values ​​as endpoints, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0112] In some embodiments of this application, the composition of the crystallized glass, expressed as the mole fraction of each oxide in the composition of the crystallized glass, further satisfies 0.034 ≤ ZrO2 / SiO2 ≤ 0.100, optionally 0.035 ≤ ZrO2 / SiO2 ≤ 0.095, and optionally 0.055 ≤ ZrO2 / SiO2 ≤ 0.095. By adjusting the content of ZrO2 and SiO2 to satisfy specific content relationships, it is possible to ensure that the crystallized glass forms a desired crystalline phase structure and has excellent optical properties, as well as to better exhibit the toughness-enhancing effect of ZrO2, ensuring that the crystallized glass has high intrinsic strength, and thus contribute to the crystallized glass acquiring high mechanical strength and excellent deformation resistance. In some embodiments, the ZrO2 / SiO2 value may be, for example, 0.041, 0.075, 0.051, 0.060, 0.067, 0.083, 0.091, 0.035, 0.037, 0.052, 0.034, 0.100, 0.095, or 0.055, or may be a value within a range configured with any two of the above specific values ​​as endpoints, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0113] In some embodiments of this application, the composition of the crystallized glass is further satisfied by the content of each oxide in mole fraction in the composition of the crystallized glass, which satisfies CaO + Al2O3 ≤ 0.065, optionally CaO + Al2O3 ≤ 0.055, and optionally CaO + Al2O3 ≤ 0.050. By controlling the total content of CaO and Al2O3 to satisfy specific requirements, it is possible to contribute to the enhancement effect while avoiding affecting the crystal precipitation of the crystallized glass, ensuring that the crystallized glass achieves the desired crystalline phase structure, and thus contributing to the crystallized glass acquiring high mechanical strength performance and excellent deformation resistance. In some embodiments, the value of CaO+Al2O3 may be, for example, 0.000, 0.053, 0.009, 0.014, 0.023, 0.032, 0.041, 0.012, 0.024, 0.050, 0.055, or 0.065, or may be a value within a range configured with any two of the above specific values ​​as endpoints, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0114] In some embodiments of this application, the composition of the crystallized glass is further satisfied by the content of each oxide in mole fraction in the composition of the crystallized glass, which satisfies (CaO + Al2O3) / Li2O ≤ 0.25, optionally (CaO + Al2O3) / Li2O ≤ 0.20, and optionally (CaO + Al2O3) / Li2O ≤ 0.14. By adjusting CaO, Al2O3, and Li2O to satisfy specific content relationships, it is possible to contribute to the enhancement effect of CaO and / or Al2O3, ensure the precipitation of lithium disilicate crystalline phases of a desired content in the crystallized glass, and ensure that the crystallized glass realizes a desired crystalline phase structure, thus contributing to the crystallized glass acquiring high mechanical strength and excellent deformation resistance. In some embodiments, the value of (CaO+Al2O3) / Li2O may be, for example, 0.00, 0.19, 0.03, 0.05, 0.08, 0.11, 0.15, 0.04, 0.14, 0.16, 0.20, or 0.25, or may be a value within a range configured with any two of the above specific values ​​as endpoints, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0115] In some embodiments of this application, the composition of the crystallized glass, expressed as the mole fraction of each oxide in the composition of the crystallized glass, further satisfies 0.12 ≤ (ZrO2-Na2O) / (SiO2-2×Li2O) ≤ 6.40, optionally 0.14 ≤ (ZrO2-Na2O) / (SiO2-2×Li2O) ≤ 6.16, and optionally 0.50 ≤ (ZrO2-Na2O) / (SiO2-2×Li2O) ≤ 3.00. By adjusting the content of ZrO2, Na2O, SiO2, and Li2O to satisfy specific content relationships, it is possible to better exert the effects of each component, contribute to the crystallized glass acquiring high intrinsic strength and excellent optical performance, and contribute to the crystallized glass acquiring high stress levels and excellent deformation resistance after chemical strengthening treatment. In some embodiments, the value of (ZrO2-Na2O) / (SiO2-2×Li2O) may be, for example, 0.12, 0.35, 0.87, 2.08, 1.72, 0.15, 1.55, 2.63, 2.73, 1.03, 0.28, 6.15, 0.86, 1.21, 6.20, 6.38, 0.14, 6.16, 0.50, 6.40, or 3.00, or may be a value within a range configured with any two of the above specific values ​​as endpoints, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance can be obtained in this application. In specific embodiments, any of the above ranges may be combined with any other range, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance can be obtained in this application.

[0116] In some embodiments of the present application, expressed by the mole fraction content of each oxide in the composition of the crystallized glass, the composition of the crystallized glass further satisfies Na₂O / SiO₂≦0.05, optionally satisfies Na₂O / SiO₂≦0.04, and optionally satisfies Na₂O / SiO₂≦0.02. Adjusting Na₂O and SiO₂ to satisfy a specific content relationship contributes to enabling the crystallized glass to obtain a high stress level and excellent deformation resistance after chemical strengthening treatment. In some embodiments, the value of Na₂O / SiO₂ can be, for example, 0.00, 0.01, 0.02, 0.03, 0.04 or 0.05, or a value within a range bounded by any two of the foregoing specific values, as long as the crystallized glass or chemically strengthened crystallized glass having the desired performance in the present application can be obtained. In specific embodiments, any of the foregoing ranges can be combined with any other ranges, as long as the crystallized glass or chemically strengthened crystallized glass having the desired performance in the present application can be obtained.

[0117] In some embodiments of the present application, the density ρ of the crystallized glass satisfies ρ≧2.50g / cm 3 , and optionally, the density ρ of the crystallized glass is 2.50g / cm 3 ~2.75g / cm 3 . In some embodiments of the present application, the refractive index of the crystallized glass is 1.60 or less. The crystallized glass satisfying the density and / or refractive index has relatively high intrinsic strength and excellent optical performance.

[0118] In some embodiments, the density ρ of the crystallized glass is 2.50g / cm 3、 2.54g / cm 3 , 2.55g / cm 3 , 2.56g / cm 3 , 2.57g / cm 3 , 2.58g / cm 3 , 2.59g / cm 3 , 2.60g / cm 3 , 2.61g / cm 3 , 2.62g / cm 3 , 2.63g / cm 32.64 g / cm³ 3 2.65 g / cm³ 3 2.70 g / cm³ 3 Or 2.75 g / cm³ 3 The range may be such that, or may be greater than or equal to any of the above specific values, or may be within a range defined by any two of the above specific values ​​as endpoints, as long as a crystallized glass or chemically strengthened crystallized glass having the desired performance can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, as long as a crystallized glass having the desired performance can be obtained.

[0119] In some embodiments, the refractive index of the crystallized glass may 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 less than or equal to any of the above specific values, or within a numerical range formed with any two of the above specific values ​​as endpoints, as long as a crystallized glass or chemically strengthened crystallized glass having the performance desired in this application can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, as long as a crystallized glass having the performance desired in this application can be obtained.

[0120] In some embodiments of this application, the crystallinity of the crystallized glass is 30.00 wt% to 90.00 wt%, optionally 50.00 wt% to 90.00 wt%, and optionally 65.00 wt% to 90.00 wt%. A relatively high content of the crystalline phase contributes to improving the mechanical strength performance of the crystallized glass and guarantees excellent optical performance of the crystallized glass. In some embodiments, the degree of crystallinity of the crystallized glass may be 30.00 wt% to 90.00 wt%, 45.00 wt% to 85.00 wt%, 50.00 wt% to 90.00 wt%, 55.00 wt% to 85.00 wt%, 60.00 wt% to 85.00 wt%, 65.00 wt% to 90.00 wt%, 70.00 wt% to 90.00 wt%, or 68.00 wt% to 85.00 wt%. In some embodiments, the degree of crystallinity of the crystallized glass may 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 within a range configured with any two of the above specific values ​​as endpoints, provided that a crystallized glass or chemically strengthened crystallized glass having the performance desired in this application can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, provided that a crystallized glass having the performance desired in this application can be obtained.

[0121] In some embodiments of this application, expressions such as "the main crystalline phase is lithium disilicate" or "the lithium disilicate crystalline phase accounts for a larger mass percentage than other crystalline phases present in the crystallized glass" mean that the lithium disilicate crystalline phase accounts for approximately 70% by mass (weight) of all crystalline phases in the crystallized glass according to the embodiments of this application.

[0122] In some embodiments of this application, other possible crystalline phases in the crystallized glass include, in non-limiting examples, a petalite crystalline phase and / or a lithium phosphate crystalline phase. In some embodiments, the crystallized glass further includes a petalite crystalline phase, optionally having a mass percentage of 20% or less of the petalite crystalline phase in the crystallized glass, and optionally having a mass percentage of 15% or less, 10% or less, or 5% or less of the petalite crystalline phase in the crystallized glass. By controlling the precipitation of other crystalline phases, lithium disilicate contributes to ensuring the formation of a desired interlocked structure, thereby ensuring that the crystallized glass obtains high mechanical strength, excellent optical properties, and excellent deformation resistance.

[0123] In some embodiments of this application, the crystallized glass has an average grain size of 100 nm or less, optionally an average grain size of 50 nm or less, and optionally an average grain size of 15 nm to 45 nm. A relatively small average grain size contributes to the crystallized glass having excellent optical performance. In some embodiments, the average grain size may be 10 nm to 100 nm, 20 nm to 90 nm, 30 nm to 80 nm, 40 nm to 60 nm, 10 nm to 30 nm, 10 nm to 20 nm, 5 nm to 35 nm, 15 nm to 35 nm, or 15 nm to 45 nm. In some embodiments, the average grain size may be 5 nm, 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, 50 nm, 55 nm, 60 nm, 70 nm, 80 nm, 90 nm, or 100 nm, or may be within a range configured with any two of the above specific values ​​as endpoints, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, provided that a crystallized glass having the desired performance for this application can be obtained.

[0124] In some embodiments of this application, the Young's modulus of the crystallized glass is 100.00 GPa or greater, optionally 110.00 GPa or greater, and optionally 114 GPa to 130 GPa. A relatively high Young's modulus, that is, a relatively high intrinsic strength of the crystallized glass, contributes to obtaining relatively high mechanical strength performance and excellent deformation resistance. In some embodiments, the Young's modulus of the crystallized glass may be 100.00 GPa to 150 GPa, 105.00 GPa to 140 GPa, 110.00 GPa to 130 GPa, 114 GPa to 130 GPa, or 114.00 GPa to 125 GPa. In some embodiments, the Young's modulus of the crystallized glass may be 100.00 GPa, 105.00 GPa, 110.00 GPa, 114.00 GPa, 115.00 GPa, 120.00 GPa, 125.00 GPa, 130.00 GPa, 140.00 GPa, or 150.00 GPa, or may be a value within a range configured with any two of the above specific values ​​as endpoints, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, provided that a crystallized glass having the desired performance for this application can be obtained.

[0125] In some embodiments of this application, when the thickness of the crystallized glass is 0.5 mm, the b-value of the crystallized glass is 1.0 or less, and optionally b-value ≤ 0.8. Crystallized glass satisfying this optical b-value can be ensured to have relatively good optical performance and display effect, and is suitable for use in screens where a display effect is required. In some embodiments, when the thickness of the crystallized glass is 0.5 mm, the b-value of the crystallized glass may be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1.0, or may be less than or equal to any of the above specific values, or may be within a range configured with any two of the above specific values ​​as endpoints, as long as crystallized glass or chemically strengthened crystallized glass having the desired performance of this application can be obtained. In specific embodiments, any of the above ranges can be combined with any other range, as long as crystallized glass having the desired performance of this application can be obtained.

[0126] In some embodiments of this application, the crystallized glass is transparent within the visible light wavelength range, and when the thickness of the crystallized glass is 0.5 mm, the transmittance of the crystallized glass is 85.00% or more at a wavelength of 550 nm, and optionally, the transmittance of the crystallized glass is 90.00% or more. Crystallized glass that satisfies this transmittance can be ensured to have relatively good light transmission, excellent transparency effect, and is suitable for use in screens where display effect is required. Here, "visible light wavelength range" refers to light in the wavelength range of 360 nm to 740 nm.

[0127] In some embodiments, when the thickness of the crystallized glass is 0.5 mm, the transmittance of the crystallized glass at a wavelength of 550 nm may be 85.00%, 86.00%, 87.00%, 88.00%, 89.00%, 90.00%, 90.50%, 91.00%, or 92.00%, or may be within a range configured with any two of the above specific values ​​as endpoints, provided that a crystallized glass or chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, provided that a crystallized glass having the desired performance for this application can be obtained.

[0128] The crystallized glass according to this application has relatively high transmittance and a relatively low b-value, meaning that the optical performance of the crystallized glass according to this application is relatively excellent and uniform, it is transparent, and can meet the application requirements for screen cover glass.

[0129] In some embodiments of this application, the upper limit temperature for crystal precipitation of the substrate glass corresponding to the crystallized glass is 1000 to 1100°C. Meeting this upper limit temperature range for crystal precipitation contributes to the realization of industrial mass production.

[0130] In some embodiments of this application, the expansion-softening point of the crystallized glass is 750°C to 850°C, and optionally, 750°C to 830°C. Depending on the appropriate expansion-softening point, it is possible to prepare crystallized glass with a 3D curved surface that contributes to 3D thermal bending of the crystallized glass and has high strength performance. In some embodiments, the expansion-softening point of the crystallized glass may be 750°C, 760°C, 770°C, 780°C, 790°C, 800°C, 810°C, 820°C, 830°C, 840°C, or 850°C, or may be a value within a range configured with any two of the above specific values ​​as endpoints. In specific embodiments, any of the above ranges may be combined with any other range, as long as it is possible to obtain crystallized glass with the desired performance in this application.

[0131] In this application, crystallized glass can be prepared by heat bending the crystallized glass, followed by the preparation of 3D curved crystallized glass. When the composition of the product is expressed in terms of the mole fraction of oxides, the composition of the 3D curved crystallized glass is the same as or approximately the same as that of the crystallized glass.

[0132] The crystallized glass according to this application can be obtained by heat-treating a base glass, and in terms of the mole fraction of oxides, the composition of the base glass used is the same as or approximately the same as the composition of the crystallized glass.

[0133] In this application, the base glass can be prepared by molding methods in the prior art, and this application is not limited thereto. For example, the molding method includes, but is not limited to, the float method, overflow method, rolling, or casting process. Exemplarily, the base glass may be prepared by uniformly mixing each raw material substance and a clarifying agent (with a uniformity of 98% or more), melting, molding, and then annealing. Process parameters may include a melting temperature of 1480°C to 1680°C, an annealing temperature of 450°C to 650°C, and holding at the annealing temperature for 10 to 48 hours. The clarifying agent may be one or more of the following: sodium chloride, tin oxide, antimony oxide, or arsenic oxide. The amount of clarifying agent added is 0 to 1 wt% of the total amount of each raw material substance.

[0134] In this application, when preparing crystallized glass by heat-treating a base glass, the heat treatment can be carried out, for example, in a crystallization furnace or an annealing furnace, and the heat treatment method includes, but is not limited to, one-stage heat treatment, two-stage heat treatment or more-stage heat treatment, and for example, it may be a two-stage heat treatment in which nucleation treatment is performed followed by crystallization treatment. Process conditions for the heat treatment include, but are not limited to, a nucleation temperature of 500°C to 700°C, a nucleation holding time of 10 minutes to 1440 minutes, a crystallization temperature of 600°C to 800°C, a crystallization holding time of 5 minutes to 1440 minutes, a heating rate of 5°C / min to 20°C / min for the entire process, and a cooling rate of 0.1°C / min to 3°C / min. After heat treatment, to obtain a crystallized glass sample that meets the desired specifications or requirements, those skilled in the art may perform other common processes, such as cutting, CNC machining (computer numerical control), or polishing.

[0135] In this application, chemically strengthened crystallized glass is further provided, wherein the composition of the central portion of the chemically strengthened crystallized glass is the same as the composition of the crystallized glass described above, and the chemically strengthened crystallized glass includes a compressive stress layer region that extends from the surface of the chemically strengthened crystallized glass to the depth of the compressive stress layer, and has tensile stress inside the chemically strengthened crystallized glass.

[0136] Compared to crystallized glass before chemical strengthening, the surface composition of a crystallized glass product after chemical strengthening may differ from that of crystallized glass before chemical strengthening (where ion exchange has not occurred). This is because, during the chemical strengthening process, one type of alkali metal ion (e.g., Li) is present on the surface of the newly formed (pre-chemical strengthening) crystallized glass. + or Na + ) are relatively large alkali metal ions (for example, Na + or K +) is replaced by the same. However, in the embodiment, the composition and phase aggregate of the glass at the center of the depth of the crystallized glass product or near the center of the depth still has the composition and phase aggregate of the newly formed crystallized glass. That is, in this application, the composition and phase aggregate of the center of the chemically strengthened crystallized glass prepared by chemical strengthening treatment or the composition and phase aggregate of the tensile stress layer is the same as or substantially the same as the newly formed crystallized glass.

[0137] In this application, the chemically strengthened crystallized glass contains a lithium disilicate crystalline phase, and the lithium disilicate crystalline phase has a larger mass fraction than the other crystalline phases present in the chemically strengthened crystallized glass. Expressed as the mole fraction of oxides, the composition of the central part of the chemically strengthened crystallized glass is SiO2: 55.00 mol%~65.00 mol%, Al2O3: 0.00 mol%~2.00 mol%, P2O5: 1.00 mol%~3.00 mol%, and ZrO2: 2.00 mol. %~6.00mol%, MgO:0.00mol%~2.00mol%, ZnO:0.00mol%~2.00mol%, Na2O:0.00mol%~3.00mol%, K2O:0.00mol%~1.00mol% l%, Li2O:27.00mol%~32.00mol%, CaO:0.00mol%~5.00mol%, B2O3:0.00mol%~1.00mol%, SrO:0.00mol%~2.00mol%.

[0138] The composition of the central part of the chemically strengthened crystallized glass, expressed as the mole fraction of oxides, satisfies 2.00 ≤ SiO2 / Li2O ≤ 2.40, optionally 2.00 ≤ SiO2 / Li2O ≤ 2.30, and optionally 2.02 ≤ SiO2 / Li2O ≤ 2.20.

[0139] In some embodiments of this application, the composition of the central region of the chemically strengthened crystallized glass, expressed as the content of oxides in mole fraction, further satisfies 0.90 ≤ SiO2 + Li2O ≤ 0.96, and / or Al2O3 / SiO2 ≤ 0.030, and / or 0.31 ≤ ZrO2 / (CaO + ZrO2 + Al2O3) ≤ 1.50, and / or 0.10 ≤ ZrO2 / (100% - 3 × Li2 The equation satisfies (O) ≤ 0.60, and / or satisfies 0.034 ≤ ZrO2 / SiO2 ≤ 0.100, and / or satisfies CaO + Al2O3 ≤ 0.065, and / or satisfies (CaO + Al2O3) / Li2O ≤ 0.25, and / or satisfies 0.12 ≤ (ZrO2 - Na2O) / (SiO2 - 2 × Li2O) ≤ 6.40, and / or satisfies Na2O / SiO2 ≤ 0.05.

[0140] In some embodiments of this application, the composition of the central region of the chemically strengthened crystallized glass, expressed in mole fractions of oxides, is as follows: 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%. It contains 1% of the following: ZnO: 0.00 mol% to 2.00 mol%, Na2O: 0.00 mol% to 3.00 mol%, K2O: 0.00 mol% to 1.00 mol%, Li2O: 27.00 mol% to 32.00 mol%, CaO: 0.00 mol% to 4.00 mol%, B2O3: 0.00 mol% to 1.00 mol%, and SrO: 0.00 mol% to 2.00 mol%.

[0141] In some embodiments of this application, the composition of the central region of the chemically strengthened crystallized glass, expressed in terms of the mole fraction of oxides, further includes Y2O3: 0.00 mol% to 1.00 mol%, La2O3: 0.00 mol% to 1.00 mol%, and Ta2O5: 0.00 mol% to 1.00 mol%.

[0142] In some embodiments of this application, the composition of the central region of the chemically strengthened crystallized glass, expressed in mole fractions of oxides, is as follows: SiO2: 60.50 mol%~64.00 mol%, Al2O3: 0.00 mol%~2.00 mol%, P2O5: 1.50 mol%~2.50 mol%, ZrO2: 3.20 mol%~6.00 mol%, MgO: 0.00 mol%~2.00 mol%, ZnO: 0.00 mol%~2.00 mol%, Na2O: 0.00 mol% It contains ol%~1.00mol%, K2O:0.00mol%~1.00mol%, Li2O:28.00mol%~31.00mol%, CaO:0.00mol%~2.50mol%, B2O3:0.00mol%~1.00mol%, SrO:0.00mol%~2.00mol%, Y2O3:0.00mol%~1.00mol%, La2O3:0.00mol%~1.00mol%, and Ta2O5:0.00mol%~1.00mol%.

[0143] In some embodiments of this application, the chemically strengthened crystallized glass has a DOL_0 of 0.18t to 0.25t, where DOL_0 is the depth of the compressive stress layer and t is the thickness of the chemically strengthened crystallized glass. In some embodiments, the depth DOL_0 of the compressive stress layer of the chemically strengthened crystallized glass may be 0.18t to 0.25t, 0.20t to 0.25t, 0.21t to 0.24t, 0.21t to 0.25t, or 0.22t to 0.25t. For example, if the thickness of the chemically strengthened crystallized glass is 0.5 mm, the DOL_0 of the chemically strengthened crystallized glass may 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 any value within a range formed with any two of the above specific values ​​as endpoints, as long as a chemically strengthened crystallized glass having the desired performance for this application can be obtained. In specific embodiments, any of the above ranges can be combined with any other range, as long as a chemically strengthened crystallized glass having the desired performance for this application can be obtained. If the DOL_0 of the chemically strengthened crystallized glass is within the above range, that is, the chemically strengthened crystallized glass has a high compressive stress layer depth, which contributes to counteracting the energy that promotes crack propagation, and it can be guaranteed that the chemically strengthened crystallized glass has excellent fracture resistance and excellent deformation resistance.

[0144] In some embodiments of this application, the chemically strengthened crystallized glass has |CT_AV| of 85 MPa to 200 MPa, where |CT_AV| is the absolute value of the mean tensile stress, and optionally, |CT_AV| is of 90 MPa to 200 MPa. In some embodiments, the chemically strengthened crystallized glass has |CT_AV| of 85 MPa to 200 MPa, 90 MPa to 200 MPa, 90 MPa to 180 MPa, 100 MPa to 150 MPa, 130 MPa to 180 MPa, 85 MPa to 100 MPa, 85 MPa to 120 MPa, 90 MPa to 150 MPa, 95 MPa to 180 MPa, 100 MPa to 140 MPa, 130 MPa to 200 MPa, or 120 MPa to 140 MPa. In some embodiments, the chemically strengthened crystallized glass may have |CT_AV| of 85 MPa, 90 MPa, 100 MPa, 110 MPa, 120 MPa, 130 MPa, 140 MPa, 150 MPa, 160 MPa, 170 MPa, 180 MPa, 190 MPa, or 200 MPa, or |CT_AV| may be a value within a numerical range configured with any two of the above specific values ​​as endpoints, provided that the chemically strengthened crystallized glass has the performance desired in this application. In specific embodiments, any of the above ranges may be combined with any other range, provided that the chemically strengthened crystallized glass has the performance desired in this application. If the |CT_AV| of the chemically strengthened crystallized glass is within the above range, that is, the chemically strengthened crystallized glass has a relatively high tensile stress level, a relatively high surface stress level, and a relatively high surface compressive stress level, which means that there is more residual energy from drops, compression, impacts or collisions that can be offset, and the chemically strengthened crystallized glass has excellent break resistance and excellent deformation resistance.

[0145] In some embodiments of this application, the chemically strengthened crystallized glass has a CT_LD of 50,000 MPa / mm to 100,000 MPa / mm, where CT_LD is the tensile stress linear density, and optionally, CT_LD is 55,000 MPa / mm to 100,000 MPa / mm. In several embodiments, the chemically strengthened crystallized glass has a CT_LD of 50,000 MPa / mm to 100,000 MPa / mm, 55,000 MPa / mm to 95,000 MPa / mm, 60,000 MPa / mm to 90,000 MPa / mm, 65,000 MPa / mm to 85,000 MPa / mm, 70,000 MPa / mm to 80,000 MPa / mm, 65,000 MPa / mm to 100,000 MPa / mm, 60,000 MPa / mm to 80,000 MPa / mm, or 60,000 MPa / mm to 100,000 MPa / mm. In some embodiments, the chemically strengthened crystallized glass may 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 value within a numerical range where CT_LD is defined as any two of the above specific values ​​as endpoints, as long as the chemically strengthened crystallized glass having the performance desired in this application can be obtained. In specific embodiments, any of the above ranges may be combined with any other range, as long as the chemically strengthened crystallized glass having the performance desired in this application can be obtained. If the CT_LD of the chemically strengthened crystallized glass falls within the above range, that is, the tensile stress accumulated inside the chemically strengthened crystallized glass is relatively dense, the chemically strengthened crystallized glass has a relatively high surface stress level, and it can be guaranteed that the chemically strengthened crystallized glass has excellent break resistance and excellent deformation resistance.

[0146] In some embodiments of this application, the chemically strengthened crystallized glass has |CT_CV| of 120 MPa to 320 MPa, optionally |CT_CV| of 135 MPa to 300 MPa, and optionally |CT_CV| of 160 MPa to 300 MPa, where |CT_CV| is the absolute value of the maximum tensile stress. In some embodiments, the chemically strengthened crystallized glass has |CT_CV| of 120 MPa to 320 MPa, 135 MPa to 300 MPa, 160 MPa to 300 MPa, 170 MPa to 285 MPa, 180 MPa to 270 MPa, 120 MPa to 250 MPa, or 165 MPa to 290 MPa. In some embodiments, the chemically strengthened crystallized glass is obtained such that |CT_CV| is 120 MPa, 135 MPa, 150 MPa, 160 MPa, 170 MPa, 180 MPa, 190 MPa, 200 MPa, 210 MPa, 220 MPa, 230 MPa, 240 MPa, 250 MPa, 260 MPa, 270 MPa, 280 MPa, 290 MPa, or 300 MPa, or |CT_CV| is a value within a numerical range configured with any two of the above specific values ​​as endpoints, provided that a chemically strengthened crystallized glass having the performance desired in this application can be obtained. In specific embodiments, any of the above ranges can be combined with any other range, provided that a chemically strengthened crystallized glass having the performance desired in this application can be obtained. If the |CT_CV| of the chemically strengthened crystallized glass is within the above range, that is, if the chemically strengthened crystallized glass has a relatively high tensile stress level, a relatively high surface stress level, and a relatively high surface compressive stress level, then more residual energy from drops, compression, impacts, or collisions can be offset, and the chemically strengthened crystallized glass can be guaranteed to have excellent break resistance and excellent deformation resistance.

[0147] In some embodiments of this application, the Vickers hardness of the chemically strengthened crystallized glass is 680 kgf / mm². 2 The above is an optional provision regarding the Vickers hardness of chemically strengthened crystallized glass, which is 700 kgf / mm². 2 ~800 kgf / mm 2 In some embodiments, the Vickers hardness of the chemically strengthened crystallized glass is 680 kgf / mm². 2700 kgf / mm 2 710 kgf / mm 2 720 kgf / mm 2 730 kgf / mm 2 740 kgf / mm 2 750 kgf / mm 2 760 kgf / mm 2 770 kgf / mm 2 780 kgf / mm 2 790 kgf / mm 2 or 800 kgf / mm 2 The Vickers hardness is within a range defined by any two specific values ​​above as endpoints, and it is sufficient to obtain a chemically strengthened crystallized glass having the desired performance for this application. In specific embodiments, any of the above ranges can be combined with any other range, and it is sufficient to obtain a chemically strengthened crystallized glass having the desired performance for this application. If the Vickers hardness of the chemically strengthened crystallized glass is within the above range, that is, the chemically strengthened crystallized glass is guaranteed to be hard and have excellent mechanical properties.

[0148] In this application, a person skilled in the art can select the thickness of crystallized glass or chemically strengthened crystallized glass according to their needs, and exemplary thicknesses of crystallized glass or chemically strengthened crystallized glass are, for example, 0.2 mm to 5 mm, 0.2 mm to 2.0 mm, 0.2 mm to 0.8 mm, 0.4 mm to 0.6 mm, or 0.2 mm to 0.7 mm.

[0149] In this application, by ensuring that the chemically strengthened crystallized glass satisfies specific compositional and stress characteristics, it can be ensured that the chemically strengthened crystallized glass has excellent mechanical strength performance, excellent fracture resistance, and excellent deformation resistance.

[0150] In some embodiments of this application, when the thickness of the chemically strengthened crystallized glass is 0.5 mm, the center of the main surface of the chemically strengthened crystallized glass is pressed with a metal indenter having a circular head with a diameter of 10 mm, and when the center of the main surface of the chemically strengthened crystallized glass is pressed with a load of 10 kgf, the amount of deformation of the point of force on the chemically strengthened crystallized glass in the direction of the applied force is 0.850 mm or less. When chemically strengthened crystallized glass is pressed, the smaller the amount of deformation, the better its deformation resistance. When it is used as a cover glass for a screen, the smaller the deformation when it is pressed or impacted, the lower the probability of it coming into contact with the inner glass screen, which helps to improve the problem of damage to the inner glass screen caused by the cover glass being impacted. In some embodiments, when the thickness of the chemically strengthened crystallized glass is 0.5 mm, and the center of the main surface of the chemically strengthened crystallized glass is pressed with a load of 10 kgf, the amount of deformation of the force-receiving point of the chemically strengthened crystallized glass along the direction of the applied force may be 0.806 mm, 0.804 mm, 0.787 mm, 0.828 mm, 0.798 mm, 0.827 mm, 0.814 mm, 0.758 mm, 0.805 mm, 0.779 mm, 0.816 mm, 0.788 mm, 0.823 mm, 0.796 mm, 0.782 mm, 0.764 mm, or 0.850 mm, or may be less than or equal to any of the above specific values, or may be within a range configured with any two of the above specific values ​​as endpoints.

[0151] In some embodiments of this application, when the thickness of the chemically strengthened crystallized glass is 0.5 mm, the center of the main surface of the chemically strengthened crystallized glass is pressed with a metal indenter having a circular head with a diameter of 10 mm, and when the amount of deformation of the center of the main surface of the chemically strengthened crystallized glass along the direction of the applied force becomes 0.400 mm, the load applied to the center of the main surface of the chemically strengthened crystallized glass is 30 N or more. The greater the load that the chemically strengthened crystallized glass can withstand when a certain deformation occurs, the greater the load that can be offset by deformation when subjected to pressure or impact. Therefore, when it deforms and comes into contact with a glass inner layer screen, the load on the glass inner layer screen due to pressure or impact is reduced, and the possibility of the glass inner layer screen failing is reduced. When chemically strengthened crystallized glass that can withstand or offset relatively large loads is used as a cover glass, it contributes to improving the problem of glass inner layer screens failing due to the cover glass being subjected to impact or pressure. In some embodiments, when the thickness of the chemically strengthened crystallized glass is 0.5 mm, the center of the main surface of the chemically strengthened crystallized glass is pressed with a metal indenter having a circular head with a diameter of 10 mm, and when the amount of deformation of the center of the main surface of the chemically strengthened crystallized glass along the direction of the applied force becomes 0.400 mm, the load applied to the center of the main surface of the chemically strengthened crystallized glass may be 36.9 N, 38.6 N, 38.5 N, 33.8 N, 37.2 N, 34.9 N, 37.4 N, 39.2 N, 38.1 N, 37.6 N, 38.7 N, 37.8 N, 38.4 N, 39.4 N, or 40.0 N, or may be greater than or equal to any of the above specific values, or may be within a range configured with any two of the above specific values ​​as endpoints.

[0152] The chemically strengthened crystallized glass according to this application can be obtained by performing a chemical strengthening treatment on the above-mentioned crystallized glass. The chemical strengthening process can refer to processes in the prior art, and it is sufficient to obtain chemically strengthened crystallized glass having the desired performance according to this application. For example, this may include, but is not limited to, first raising the temperature of a molten salt containing a certain concentration of sodium ions to the temperature required for chemical strengthening, then preheating the crystallized glass (for example, by adopting a heating rate of 5°C / min to 100°C / min) to the required chemical strengthening temperature, placing it in the molten salt, subjecting it to constant temperature treatment for the time required for chemical strengthening, removing it and cooling it to room temperature, washing and removing any salt remaining on the surface, and drying it to obtain chemically strengthened crystallized glass having a high stress level and excellent deformation resistance.

[0153] In some embodiments of this application, the temperature of the molten salt bath for chemical strengthening treatment may be 380°C to 550°C, and the duration of the chemical strengthening treatment may be 0.5 hours to 24 hours, provided that a chemically strengthened crystallized glass having the desired performance for this application can be obtained.

[0154] In some embodiments of this application, the composition of the molten salt by mass fraction comprises 5 wt% to 50 wt% sodium salt, 50 to 95 wt% potassium salt, and 0.01 to 0.30 wt% lithium salt, wherein the sodium salt, potassium salt, and lithium salt can each independently be nitrates, sulfates, phosphates, or carbonates, as long as a chemically strengthened crystallized glass having the desired performance in this application can be obtained. In some embodiments, after the chemical strengthening treatment is completed, the chemically strengthened crystallized glass is cooled at a cooling rate of 1°C / min to 50°C / min.

[0155] In this application, the chemically strengthened crystallized glass prepared from the above-mentioned crystallized glass, which has high strength and transparency, has excellent deformation resistance and excellent resistance to drop damage. When this chemically strengthened crystallized glass is used as a cover glass for electronic equipment, the cover glass of the electronic equipment is less likely to break, and when the cover glass is compressed or impacted, it can effectively prevent the inner layer screen from being impacted and breaking or failing, thereby better protecting the inner layer screen.

[0156] The transparent crystallized glass or chemically strengthened crystallized glass relating to this application, having excellent mechanical strength and excellent deformation resistance, can be used in electronic devices, including but not limited to mobile phones, tablets, portable game consoles, portable digital devices (e.g., digital cameras), in-car infotainment systems, electronic whiteboard glass, and smart homes, as well as in vehicles, airplanes, or aircraft, and in any glass device that uses crystallized glass. For example, it can be used in displays, cover glass, touch panels, glass inner layer screens or inner frames of electronic devices, and for example, in windshields such as the windshield or side windows of vehicles, aircraft, or aircraft. Examples include work surfaces, other surfaces, electrical appliance doors, floor tiles, wall panels, or storage containers. Other surfaces include, but are not limited to, exterior wall surfaces, stair surfaces, column decorative panels, or counter surfaces. Storage containers include, but are not limited to, cups, plates, medicine bottles, or beverage bottles.

[0157] The embodiments of this application described below are illustrative and intended solely for interpretation purposes and not to limit this application.

[0158] In the table below, among the example numbers, S indicates an example, for example S1 is Example 1, and D indicates a comparative example, for example D1 is Comparative Example 1.

[0159] Example 1 (1) Preparation of the base glass: A total mass of 1000g of raw materials (prepared according to the S1 formulation in Table 1, with the proportions of each oxide referred to in Table 2) was prepared. 5g of sodium chloride was added to the prepared raw materials, and the mixture was mixed for 30 minutes at a rotation speed of 25 r / min using a V-type mixer. The mixture was then melted in a platinum crucible at 1650°C for 5 hours, and then molded into a glass block. After cooling to 900°C, the mixture was annealed in an annealing furnace at 460°C for 12 hours, and then furnace-cooled to room temperature to obtain a base glass block.

[0160] (2) Preparation of crystallized glass: A base glass block was placed in a crystallization furnace and heated from room temperature to 525°C at a heating rate of 10°C / min to perform nucleation treatment. After holding the temperature at this temperature for 240 minutes, the temperature was heated to 685°C at a heating rate of 10°C / min to perform crystallization treatment. After holding the temperature at this temperature for 60 minutes, the temperature was cooled to room temperature at a cooling rate of 1°C / min to obtain a crystallized glass block sample. Expressed as the mole fraction of oxides, the composition of the prepared crystallized glass was the same as that of the base glass, and details are shown in Tables 1 and 2.

[0161] The obtained crystallized glass block sample was sequentially cut, CNC machined (model number of the CNC machine used in this application: RCG500S), and polished to obtain a crystallized glass sample that met the desired specifications and requirements. In this application, the above cold working treatment was performed on the crystallized glass block sample to obtain a crystallized glass sample with a thickness of 0.50 mm, specifically a crystallized glass polished sheet sample of 50 mm × 50 mm × 0.5 mm.

[0162] The measurement is performed on the crystallized glass obtained in S1.

[0163] The main crystalline phase, degree of crystallinity, average grain size, expansion softening point, density, refractive index, Young's modulus, and the optical b-value and transmittance (using light at a wavelength of 550 nm) of a 0.5 mm thick crystallized glass sample were measured, and the results are shown in Table 3.

[0164] (3) Preparation of chemically strengthened crystallized glass: The obtained crystallized glass sample was placed in the strengthening furnace chamber and preheated for 5 minutes. After preheating, it was quickly placed in molten salt at 450°C and chemically strengthened. The composition of the molten salt was 29.99 wt% NaNO3 + 69.98 wt% KNO3 + 0.03 wt% LiNO3. After chemical strengthening for 21.0 hours, the glass sample was removed and placed in the furnace body of the strengthening furnace to cool slowly to room temperature. The salt adhering to the glass surface was washed off with clean water, and the glass sample was dried to obtain chemically strengthened crystallized glass.

[0165] Measurements were performed on the chemically strengthened crystallized glass obtained in S1.

[0166] I. Chemically strengthened crystallized glass was subjected to stress meter SLP2000 (light source wavelength used: 518 nm, SOC = 25.5 (nm / cm) / MPa, refractive index set according to the refractive index value of the crystallized glass sample, refractive index of the crystallized glass sample at S1: 1.5600, exposure time: 300 μsec) to measure |CT_CV|, DOL_0, and |CT_AV|, and the tensile stress linear density (CT_LD) value was calculated. The results are shown in Table 4.

[0167] II. The Vickers hardness of chemically strengthened crystallized glass was measured, and the results are shown in Table 4.

[0168] III. The deformation resistance of chemically strengthened crystallized glass was tested. For example, the amount of deformation of the chemically strengthened crystallized glass under a load of 10 kgf was measured, and the load on the chemically strengthened crystallized glass when the deformation amounted to 0.40 mm was measured. The results are shown in Table 4.

[0169] Examples 2 to 18 The process was carried out with reference to Example 1, and the differences, including the raw material composition, process parameters, and corresponding measurement results for each example, are shown in Tables 1 to 4.

[0170] Figure 1 shows the DSC graph of the substrate glass according to Example 3, and this graph allows us to determine the heat treatment process to be used when preparing crystallized glass using this substrate glass.

[0171] The XRD pattern of the crystallized glass according to Example 3 is shown in Figure 2. As can be seen from the figure, the main crystalline phase in the crystallized glass is the lithium disilicate crystalline phase.

[0172] Figure 3 shows a graph illustrating the transmittance of the crystallized glass according to Example 3. As can be seen from this glass, the crystallized glass is transparent within the visible light wavelength range and also has high transmittance.

[0173] Figure 4 shows a graph illustrating the load deformation of the chemically strengthened crystallized glass according to Example 3. From this graph, it is possible to see the amount of deformation of the chemically strengthened crystallized glass when compressed with different loads, and the load conditions on the chemically strengthened crystallized glass when different amounts of deformation occur.

[0174] Comparative Examples 1 to 8 The procedure was carried out with reference to Example 1, and the differences, including the raw material composition, process parameters, and corresponding measurement results for each comparative example, are shown in Tables 5 to 8.

[0175] Figure 5 shows a graph illustrating the load deformation of chemically strengthened crystallized glass according to Comparative Example 3.

[0176] Testing the upper limit temperature for crystal precipitation: To analyze the industrial mass production feasibility of the crystallized glass according to this application, the upper limit temperature for crystal precipitation of the substrate glass was tested using some examples. The upper limit temperature for crystal precipitation of the substrate glass according to S3 was 1067.2°C, and the upper limit temperature for crystal precipitation of the substrate glass according to S4 was 1053.5°C. Both are below 1100°C, meaning that the upper limit temperature for crystal precipitation is between 1000°C and 1100°C, which indicates that the crystallized glass according to this application can contribute to industrial mass production.

[0177] Expansion and Softening Point Test: To analyze the 3D thermal bending effect of the crystallized glass according to this application, the expansion and softening points of the crystallized glass were tested according to some examples. Details can be found in Table 3. According to the test results, the expansion and softening points of the crystallized glass according to this application were all below 830°C, ranging from 750°C to 850°C. In other words, the crystallized glass according to this application can contribute to the preparation of 3D curved crystallized glass by 3D thermal bending molding. [Table 1] Note: In Table 1, an oxide content of "0.00%" means that the component was not voluntarily or intentionally included in the glass mixture in the initial formulation, and that the component may be present as an impurity.

[0178] [Table 2] Note: The values ​​in Table 2 are obtained by substituting the molar percentage content of the oxide into each formula. For example, the molar percentage content of Al2O3 is 2%, and therefore, 2% was substituted into the formula for the calculation.

[0179] [Table 3] Note: In Table 3, " / " indicates that measurement was not performed.

[0180] [Table 4]

[0181] [Table 5] Note: A "0.00%" oxide content in Table 5 means that the component was not voluntarily or intentionally included in the glass mixture in the initial formulation, and that the component may be present as an impurity.

[0182] [Table 6] Note: The values ​​in Table 6 are obtained by substituting the molar percentage content of oxides into each formula, and the mole units do not play a role in the calculation of the formulas. For example, the molar percentage content of Al2O3 is 2%, and therefore, 2% was substituted into the formula for the calculation.

[0183] [Table 7]

[0184] [Table 8]

[0185] As can be seen from the results of the examples in Tables 1 to 4 and the comparative examples in Tables 5 to 8 above, compared to the comparative examples, the proposed examples of this application, when satisfying the content range of each oxide and the specific oxide content relationship, produce crystallized glass with excellent optical performance and a high Young's modulus, with lithium disilicate being the main crystalline phase of the crystallized glass. Furthermore, the chemically strengthened crystallized glass prepared using the crystallized glass according to the examples of this application has a high stress level and high mechanical strength performance, and its deformation resistance is clearly superior to that of the comparative examples. In addition, the upper limit temperature for crystal precipitation of the substrate glass corresponding to the crystallized glass according to the examples of this application is relatively low, making it suitable for industrial mass production. Moreover, the crystallized glass according to the examples of this application has an appropriate expansion softening point temperature, making it suitable for 3D thermal bending molding as 3D curved crystallized glass.

[0186] In the proposals based on Comparative Examples 1 to 8, the glass composition did not simultaneously satisfy the content ranges and specific oxide content relationships of each oxide specified in this application. As a result, the prepared crystallized glass either had inferior optical performance or failed to yield chemically strengthened crystallized glass with relatively superior deformation resistance.

[0187] A comparison of Figures 4 and 5 shows that when the center of the main surface of the chemically strengthened crystallized glass according to Example 3 of this application is pressed, resulting in a deformation of 0.40 mm, the load received or offset is clearly greater than that of Comparative Example 3. In other words, the chemically strengthened crystallized glass according to this application has superior deformation resistance.

[0188] The above describes preferred embodiments of the present application, but the present application is not limited thereto. Modifications to the proposed invention can be made within the scope of the present application, and each technical feature can be combined in any other manner. These modifications and combinations are deemed to be within the scope of the disclosures of the present application and are protected by the present application.

[0189] Industrial applicability This application guarantees that crystallized glass in which the main crystalline phase is lithium disilicate can have high intrinsic strength and excellent optical performance by satisfying specific oxide content and specific oxide content relationships, and that chemically strengthened crystallized glass with a high stress level and excellent deformation resistance can be formed by a chemical strengthening treatment method.

Claims

1. It is a crystallized glass, The crystallized glass contains a lithium disilicate crystalline phase, and the lithium disilicate crystalline phase has a larger mass fraction than other crystalline phases present in the crystallized glass. Expressed in terms of the mole fraction of oxides, the composition of the crystallized glass is: SiO ２ : 55.00 mol% to 65.00 mol%, Al ２ O ３ : 0.00 mol% to 2.00 mol%, P ２ O ５ : 1.00 mol% to 3.00 mol%, ZrO ２ : 2.00 mol% to 6.00 mol%, MgO: 0.00 mol% to 2.00 mol%, ZnO: 0.00 mol% to 2.00 mol%, Na ２ O: 0.00 mol% to 3.00 mol%, K ２ O: 0.00 mol% to 1.00 mol%, Li ２ O: 27.00 mol% to 32.00 mol%, CaO: 0.00 mol% to 5.00 mol%, B ２ O ３ : 0.00 mol% to 1.00 mol%, SrO: 0.00 mol% to 2.00 mol%, The content of each oxide in the composition of the crystallized glass, expressed as a mole fraction, is such that the composition of the crystallized glass is 2.00 ≤ SiO ２ / Li ２ The conditions O ≤ 2.40 are satisfied, and optionally 2.00 ≤ SiO ２ / Li ２ The condition O ≤ 2.30 is satisfied, and optionally 2.02 ≤ SiO ２ / Li ２ Satisfying O ≤ 2.20 Crystallized glass characterized by the following features.

2. The content of each oxide in the composition of the crystallized glass, expressed as a mole fraction, is further defined as follows: 0.90 ≤ SiO ２ +Li ２ The conditions O ≤ 0.96 are satisfied, and optionally 0.90 ≤ SiO ２ +Li ２ Satisfying O ≤ 0.95, and / or, Al ２ O ３ / SiO ２ Satisfying ≤ 0.030 The crystallized glass according to feature 1.

3. The content of each oxide in the composition of the crystallized glass, expressed as a mole fraction, is further defined as 0.31 ≤ ZrO ２ / (CaO+ZrO) ２ +Al ２ O ３ ) ≤ 1.50, and optionally 0.32 ≤ ZrO ２ / (CaO+ZrO) ２ +Al ２ O ３ ) ≤ 1.20, and optionally 0.36 ≤ ZrO ２ / (CaO+ZrO) ２ +Al ２ O ３ ) ≤ 1.10 and / or, 0.10 ≤ ZrO ２ / (100% - 3 × Li ２ O) ≤ 0.60, and optionally 0.12 ≤ ZrO ２ / (100% - 3 × Li ２ O) ≤ 0.52, and optionally 0.16 ≤ ZrO ２ / (100% - 3 × Li ２ O) satisfies ≤ 0.50, and / or, 0.034 ≤ ZrO ２ / SiO ２ The condition satisfies ≤ 0.100, and optionally, 0.035 ≤ ZrO ２ / SiO ２ Satisfying ≤ 0.095, and optionally 0.055 ≤ ZrO ２ / SiO ２ Satisfying ≤ 0.095 The crystallized glass according to feature 1 or 2.

4. The content of each oxide in the composition of the crystallized glass, expressed as a mole fraction, is further expressed as CaO + Al ２ O ３ The condition satisfies ≤ 0.065, and optionally, CaO + Al ２ O ３ The condition satisfies ≤ 0.055, and optionally, CaO + Al ２ O ３ Satisfying ≤ 0.050, and / or, (CaO + Al ２ O ３ ) / Li ２ Satisfying O ≤ 0.25, optionally, (CaO + Al ２ O ３ ) / Li ２ Satisfying O ≤ 0.20, and optionally, (CaO + Al ２ O ３ ) / Li ２ Satisfying O ≤ 0.14 The crystallized glass according to any one of claims 1 to 3.

5. The content of each oxide in the composition of the crystallized glass, expressed as a mole fraction, is further defined as 0.12 ≤ (ZrO ２ -Na ２ O) / (SiO ２ -2 × Li ２ (ZrO) ≤ 6.40, and optionally 0.14 ≤ (ZrO) ２ -Na ２ O) / (SiO ２ -2 × Li ２ O) ≤ 6.16, and optionally 0.50 ≤ (ZrO) ２ -Na ２ O) / (SiO ２ -2 × Li ２ O) satisfies ≤ 3.00, and / or, Na ２ O / SiO ２ Satisfying ≤ 0.05, and optionally, Na ２ O / SiO ２ Satisfying ≤ 0.04, optionally, Na ２ O / SiO ２ Satisfying ≤ 0.02 The crystallized glass according to any one of claims 1 to 4.

6. Expressed as the mole fraction of oxides, in the crystallized glass, SiO ２ The content is 60.00 mol% to 65.00 mol%, and optionally, SiO ２ The content is 60.50 mol% to 64.00 mol%, and / or Li ２ The O content is 28.00 mol% to 31.00 mol%, and optionally, Li ２ The O content is 29.00 mol% to 30.50 mol%, and / or ZrO ２ The content is 3.20 mol% to 6.00 mol%, and optionally, ZrO ２ The content is 4.00 mol% to 6.00 mol%, and / or P ２ O ５ has a content of 1.50 mol% to 3.00 mol%, and optionally, P ２ O ５ has a content of 1.50 mol% to 2.50 mol%, and / or Na ２ The O content is 0.00 mol% to 1.00 mol%, and optionally, Na ２ The O content is 0.00 mol% to 0.50 mol%, and / or The CaO content is 0.00 mol% to 4.00 mol%, and optionally, the CaO content is 0.00 mol% to 2.50 mol%. The crystallized glass according to any one of claims 1 to 5.

7. When expressed in terms of mole fraction of oxides, the composition of the crystallized glass comprises Y ２ O ３ : 0.00 mol% to 1.00 mol%, La ２ O ３ : 0.00 mol% to 1.00 mol%, Ta ２ O ５ : 0.00 mol% to 1.00 mol%, and further includes The crystallized glass according to any one of claims 1 to 6.

8. Expressed as the mole fraction of oxides, in the crystallized glass, Na ２ O and K ２ The total amount of oxygen is less than 1.00 mol%. The crystallized glass according to any one of claims 1 to 7.

9. The density ρ of the crystallized glass is ρ ≥ 2.50 g / cm³. ３ And optionally, the density ρ of the crystallized glass is 2.50 g / cm³. ３ ~2.75 g / cm ３ and / or, the refractive index of the crystallized glass is 1.60 or less. The crystallized glass according to any one of claims 1 to 8.

10. The crystallinity of the crystallized glass is 30.00 wt% to 90.00 wt%, optionally 50.00 wt% to 90.00 wt%, optionally 65.00 wt% to 90.00 wt%, and / or In the crystallized glass, the average grain size is 100 nm or less, optionally the average grain size is 50 nm or less, and optionally the average grain size is 15 nm to 45 nm. The crystallized glass according to any one of claims 1 to 9.

11. The Young's modulus of the crystallized glass is 100.00 GPa or higher, optionally 110.00 GPa or higher, and optionally 114 GPa to 130 GPa. The crystallized glass according to any one of claims 1 to 10.

12. When the thickness is 0.5 mm, the b value of the crystallized glass is 1.0 or less, optionally, the b value is 0.8 or less, and / or The crystallized glass is transparent within the visible light wavelength range, and when its thickness is 0.5 mm, its transmittance at a wavelength of 550 nm is 85.00% or higher, and optionally, its transmittance is 90.00% or higher. The crystallized glass according to any one of claims 1 to 11.

13. The expansion and softening point of the crystallized glass is 750°C to 850°C, and optionally, the expansion and softening point of the crystallized glass is 750°C to 830°C. The crystallized glass according to any one of claims 1 to 12.

14. Chemically strengthened crystallized glass, The composition of the central portion of the chemically strengthened crystallized glass is the same as the composition of the crystallized glass described in any one of claims 1 to 13, and the chemically strengthened crystallized glass includes a compressive stress layer region that extends from the surface of the chemically strengthened crystallized glass to the depth of the compressive stress layer, and has tensile stress inside the chemically strengthened crystallized glass. Chemically strengthened crystallized glass characterized by the following features.

15. The chemically strengthened crystallized glass contains a lithium disilicate crystalline phase, and the lithium disilicate crystalline phase has a larger mass fraction than other crystalline phases present in the chemically strengthened crystallized glass. Expressed as the mole fraction of oxide, the composition of the central part of the chemically strengthened crystallized glass is SiO ２ : 55.00 mol% to 65.00 mol%, Al ２ O ３ : 0.00 mol% to 2.00 mol%, P ２ O ５ : 1.00 mol% to 3.00 mol%, ZrO ２ : 2.00 mol% to 6.00 mol%, MgO: 0.00 mol% to 2.00 mol%, ZnO: 0.00 mol% to 2.00 mol%, Na ２ O: 0.00 mol% to 3.00 mol%, K ２ O: 0.00 mol% to 1.00 mol%, Li ２ O: 27.00 mol% to 32.00 mol%, CaO: 0.00 mol% to 5.00 mol%, B ２ O ３ It contains 0.00 mol% to 1.00 mol%, and SrO: 0.00 mol% to 2.00 mol%, The composition of the central part of the chemically strengthened crystallized glass, expressed as the mole fraction of oxides, is 2.00 ≤ SiO ２ / Li ２ The conditions O ≤ 2.40 are satisfied, and optionally 2.00 ≤ SiO ２ / Li ２ The condition O ≤ 2.30 is satisfied, and optionally 2.02 ≤ SiO ２ / Li ２ Satisfying O ≤ 2.20 The chemically strengthened crystallized glass according to feature 14.

16. The composition of the central portion of the chemically strengthened crystallized glass, expressed as the mole fraction of oxides, is further as follows: 0.90 ≤ SiO ２ +Li ２ Satisfying O ≤ 0.96, and / or, Al ２ O ３ / SiO ２ Satisfying ≤ 0.030, and / or, 0.31 ≤ ZrO ２ / (CaO+ZrO) ２ +Al ２ O ３ ) ≤ 1.50 and / or, 0.10 ≤ ZrO ２ / (100% - 3 × Li ２ O) satisfies ≤ 0.60, and / or, 0.034 ≤ ZrO ２ / SiO ２ Satisfying ≤ 0.100, and / or, CaO + Al ２ O ３ Satisfying ≤ 0.065, and / or, (CaO + Al ２ O ３ ) / Li ２ Satisfying O ≤ 0.25, and / or, 0.12 ≤ (ZrO ２ -Na ２ O) / (SiO ２ -2 × Li ２ O) satisfies ≤ 6.40, and / or, Na ２ O / SiO ２ Satisfying ≤ 0.05 The chemically strengthened crystallized glass according to feature 14 or 15.

17. Expressed as the mole fraction of oxides, the composition of the central part of the chemically strengthened crystallized glass is: SiO ２ The content is 60.00 mol% to 65.00 mol%, and optionally, SiO ２ The content is 60.50 mol% to 64.00 mol%, and / or Li ２ The O content is 28.00 mol% to 31.00 mol%, and optionally, Li ２ The O content is 29.00 mol% to 30.50 mol%, and / or ZrO ２ The content is 3.20 mol% to 6.00 mol%, and optionally, ZrO ２ The content is 4.00 mol% to 6.00 mol%, and / or P ２ O ５ The content is 1.50 mol% to 3.00 mol%, and optionally, P ２ O ５ The content of is 1.50 mol% to 2.50 mol%, and / or Na ２ The O content is 0.00 mol% to 1.00 mol%, and optionally, Na ２ The O content is 0.00 mol% to 0.50 mol%, and / or The CaO content is 0.00 mol% to 4.00 mol%, and optionally, the CaO content is 0.00 mol% to 2.50 mol%. A chemically strengthened crystallized glass according to any one of claims 14 to 16.

18. Expressed as the mole fraction of oxides, the composition of the central part of the chemically strengthened crystallized glass is Y ２ O ３ :0.00mol%~1.00mol%, La ２ O ３ :0.00mol%~1.00mol%, Ta ２ O ５ : Contains an additional 0.00 mol% to 1.00 mol% A chemically strengthened crystallized glass according to any one of claims 14 to 17.

19. The chemically strengthened crystallized glass has a DOL_0 of 0.18t to 0.25t, and optionally, a DOL_0 of 0.20t to 0.25t, where t is the thickness of the chemically strengthened crystallized glass. A chemically strengthened crystallized glass according to any one of claims 14 to 18.

20. The chemically strengthened crystallized glass has a |CT_AV| of 85 MPa to 200 MPa, optionally a |CT_AV| of 90 MPa to 200 MPa, optionally a |CT_AV| of 130 MPa to 200 MPa, and |CT_AV| is the absolute value of the mean tensile stress. A chemically strengthened crystallized glass according to any one of claims 14 to 19.

21. The chemically strengthened crystallized glass has a CT_LD of 50,000 MPa / mm to 100,000 MPa / mm, optionally a CT_LD of 55,000 MPa / mm to 100,000 MPa / mm, optionally a CT_LD of 65,000 MPa / mm to 100,000 MPa / mm, and CT_LD is the tensile stress linear density. A chemically strengthened crystallized glass according to any one of claims 14 to 20.

22. The chemically strengthened crystallized glass has a |CT_CV| of 120 MPa to 320 MPa, optionally a |CT_CV| of 135 MPa to 300 MPa, and optionally a |CT_CV| of 160 MPa to 300 MPa. A chemically strengthened crystallized glass according to any one of claims 14 to 21.

23. The Vickers hardness of the aforementioned chemically strengthened crystallized glass is 680 kgf / mm². ２ The above is the case, and optionally, the Vickers hardness of the chemically strengthened crystallized glass is 700 kgf / mm². ２ ~800kgf / mm ２ That is A chemically strengthened crystallized glass according to any one of claims 14 to 22.

24. When the thickness of the chemically strengthened crystallized glass is 0.5 mm, and the center of the main surface of the chemically strengthened crystallized glass is pressed with a metal indenter having a circular head with a diameter of 10 mm, and the center of the main surface of the chemically strengthened crystallized glass is pressed with a load of 10 kgf, the amount of deformation of the part of the chemically strengthened crystallized glass receiving the force in the direction of the applied force is 0.850 mm or less. A chemically strengthened crystallized glass according to any one of claims 14 to 23.

25. When the thickness of the chemically strengthened crystallized glass is 0.5 mm, and the center of the main surface of the chemically strengthened crystallized glass is pressed with a metal indenter having a circular head with a diameter of 10 mm, and the deformation of the center of the main surface of the chemically strengthened crystallized glass along the direction of the applied force becomes 0.400 mm, then the load applied to the center of the main surface of the chemically strengthened crystallized glass is 30 N or more. A chemically strengthened crystallized glass according to any one of claims 14 to 24.

26. Includes crystallized glass according to any one of claims 1 to 13 or chemically strengthened crystallized glass according to any one of claims 14 to 25 A glass device characterized by the following features.

27. Includes crystallized glass according to any one of claims 1 to 13 or chemically strengthened crystallized glass according to any one of claims 14 to 25 An electronic device characterized by the following features.

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