A compression-strengthened glass-ceramic, cover glass, electronic device, and glassware

Abstract

The application provides a compression-resistant strengthened glass ceramic, a cover plate glass, an electronic device and a glass device, and belongs to the technical field of glass ceramics. The application uses zinc-aluminum spinel-magnesium-aluminum spinel solid solution as the main crystal phase of the glass ceramic, so that the glass ceramic has high intrinsic strength. The application chemically strengthens the glass ceramic with a thickness greater than 0.7 mm and containing specific contents of Li ions and Na ions, and makes the surface composition of the prepared strengthened glass ceramic meet specific requirements, thereby significantly improving the compression resistance of the strengthened glass ceramic and making the strengthened glass ceramic have excellent extrusion resistance. The application of the strengthened glass ceramic to electronic devices enables the electronic devices to meet the application environment with high requirements for compression resistance, such as better matching the application requirements in a water environment (such as a deep sea environment) and application in a deep water environment.

Description

Technical Field

[0001] This application relates to the field of glass-ceramic technology, and more specifically, to a pressure-resistant reinforced glass ceramic, cover glass, electronic equipment, and glass device. Background Technology

[0002] With the widespread adoption of smart electronic devices, people are demanding higher performance from them. For example, more and more smart wearable devices are required to be usable in aquatic environments, such as swimming and diving. However, aquatic use necessitates meeting certain pressure resistance requirements. In addition to potential destructive impacts, smart wearable devices must withstand water pressure in deep water. Only with sufficient pressure resistance can the device's structure be protected from excessive water pressure in deep water.

[0003] As is well known, the deeper the water, the greater the pressure. In underwater environments, the pressure increases by one atmosphere for every 10 meters of depth. Therefore, diving environments, especially deep-sea diving environments, place significant stress on smart wearable devices. Similarly, the transparent glass windows of some devices used for deep-sea manned exploration also have extremely high pressure resistance requirements. Currently, while glass ceramics on the market generally outperform ordinary glass in terms of performance, their pressure resistance still needs further improvement. Summary of the Invention

[0004] Spinel crystals possess excellent properties such as high hardness and high modulus. By using glass-ceramics with spinel crystal phase as the main crystal phase for chemical strengthening, reinforced glass-ceramics can be prepared. Compared with ordinary glass, this method is more conducive to obtaining reinforced glass-ceramic materials with excellent extrusion resistance.

[0005] The purpose of this application is to provide a reinforced glass-ceramic with excellent extrusion resistance and spinel as the main crystalline phase. To achieve this purpose, this application provides the following technical solution:

[0006] In a first aspect, a reinforced glass ceramic is provided, wherein the reinforced glass ceramic is plate-shaped, and the thickness t of the reinforced glass ceramic is greater than 0.7 mm, preferably not less than 0.8 mm, and more preferably not less than 0.9 mm.

[0007] The reinforced glass-ceramic comprises a primary crystalline phase of zinc aluminum spinel-magnesium aluminum spinel solid solution and a secondary crystalline phase of zirconium oxide; the reinforced glass-ceramic has a compressive stress layer on its surface and tensile stress inside.

[0008] The composition at the center of the reinforced glass ceramic, based on the mass percentage of oxides, includes Li2O and Na2O, wherein the mass percentage of Li2O is greater than 1.00%, preferably greater than 1.30%, more preferably greater than or equal to 1.50%, and the mass percentage of Na2O is greater than 1.00%, preferably greater than 2.00%, more preferably greater than 2.70%.

[0009] The surface K2O of the reinforced glass ceramic is 2.00% to 7.50% by mass percentage of oxides, preferably 2.50% to 6.50%, and more preferably 3.00% to 6.00% by mass percentage of oxides.

[0010] The surface Na2O of the reinforced glass ceramic is less than or equal to 0.010% by mass percentage of oxides, preferably less than or equal to 0.005%, and more preferably less than or equal to 0.002%.

[0011] The strengthened glass-ceramic satisfies the following conditions: 5.00μm ≤ DOL_K ≤ 20.00μm, preferably 5.50μm ≤ DOL_K ≤ 18.00μm, and more preferably 6.00μm ≤ DOL_K ≤ 16.00μm, where DOL_K is K measured from the main surface of the strengthened glass-ceramic. + Diffusion depth.

[0012] It should be understood that the reinforced glass-ceramic of this application is made by chemically strengthening glass-ceramic, and the composition of the core of the reinforced glass-ceramic is the same as or substantially the same as the composition of the glass-ceramic. That is, in this application, the glass-ceramic used to prepare the reinforced glass-ceramic also contains a certain amount of Li2O and Na2O.

[0013] In this application, by simultaneously containing a certain amount of Li2O and Na2O in the glass ceramic, not only can the fracture toughness of the glass ceramic be increased, making it less prone to breakage when subjected to compression or impact, but it also helps to improve the chemical strengthening effect of the glass ceramic.

[0014] This application utilizes a zinc-aluminum spinel-magnesium-aluminum spinel solid solution as the main crystalline phase of the glass-ceramic, thereby achieving high intrinsic strength. Furthermore, by chemically strengthening this glass-ceramic with a thickness greater than 0.7 mm and containing specific amounts of Li and Na ions, and ensuring the surface composition of the resulting strengthened glass-ceramic meets specific requirements, the compressive strength of the strengthened glass-ceramic is significantly improved, resulting in excellent extrusion resistance. In this application, (Zn,Mg)Al2O4 is used to represent the zinc-aluminum spinel-magnesium-aluminum spinel solid solution (or also referred to as zinc-magnesium spinel solid solution, zinc-spinel-magnesium spinel solid solution, or zinc-magnesium-aluminum spinel solid solution).

[0015] As an optional implementation, the surface K2O mass percentage of the reinforced glass-ceramic is 3.91%, 4.16%, 3.96%, 4.12%, 4.53%, 3.24%, 4.55%, 4.51%, 4.68%, 5.75%, 3.85%, 4.48%, 5.69%, 5.45%, 5.57%, or 5.54%; and / or,

[0016] The DOL_K of the reinforced glass ceramic is 7.70 μm, 9.60 μm, 10.30 μm, 8.40 μm, 10.40 μm, 8.60 μm, 14.10 μm, 12.50 μm, 6.20μm, 9.80μm, 12.80μm, 9.10μm, 8.30μm, 8.80μm, 11.40μm, 10.60μm, 11.80μm or 11.70μm.

[0017] As an optional implementation, the reinforced glass ceramic satisfies the following: along the thickness direction of the reinforced glass ceramic, the concentration of element K decreases non-linearly from the main surface of the reinforced glass ceramic towards the center of the reinforced glass ceramic.

[0018] As an alternative implementation, the composition at the center of the reinforced glass ceramic contains 30.00% or more Al2O3 by mass percentage of oxides.

[0019] In this application, by controlling the mass percentage of Al2O3 in the glass-ceramic to be greater than or equal to 30%, it is possible to ensure the precipitation of the desired amount of main crystalline phase, thereby enabling the glass-ceramic to obtain high intrinsic strength (or inherent strength). Furthermore, it ensures that the glass phase also contains a certain amount of alumina. The alumina present in the glass phase can enter the glass network structure as [AlO4] tetrahedra, forming a unified network with [SiO4], enhancing the network's connectivity and improving the strength and stability of the glass network structure, thus further improving the intrinsic strength of the glass-ceramic. Simultaneously, the [AlO4] tetrahedra in the glass phase can appropriately expand the ion exchange channels, improving the chemical strengthening effect of the glass-ceramic and making it more conducive to obtaining strengthened glass-ceramics with excellent mechanical strength properties.

[0020] As an alternative implementation, the composition at the center of the reinforced glass ceramic contains ZrO2 at a mass percentage greater than or equal to 3.00%.

[0021] In this application, by controlling the mass percentage of zirconium oxide in the glass-ceramic to be greater than or equal to 3.00%, the intrinsic strength of the glass-ceramic is improved, and the surface stress level of the resulting strengthened glass-ceramic is increased. On one hand, zirconium oxide, as a nucleating agent, disperses in the glass phase as nanoscale grains after heat treatment, increasing the hardness of the glass-ceramic and effectively improving its fracture resistance. On the other hand, zirconium oxide exists in the glass phase in the form of cubic [ZrO8], which enhances interionic forces, making the glass structure more compact and thus improving the mechanical strength of the glass phase. Simultaneously, zirconium oxide significantly increases the surface compressive stress formed through ion exchange, thereby improving the surface stress level of the resulting strengthened glass-ceramic.

[0022] As an optional implementation, the thickness t of the reinforced glass ceramic is 0.85mm to 2.00mm, preferably 0.90mm to 1.50mm; and / or, the reinforced glass ceramic is 2D, 2.5D, 3D, or irregularly shaped; and / or, the reinforced glass ceramic is of uniform or unequal thickness. In this application, when the thickness of the reinforced glass ceramic is small, its compressive strength will be significantly reduced, while when the thickness is too large, on the one hand, it will lead to an increase in weight, which is not conducive to achieving the thinness and lightness of electronic devices; on the other hand, too large a thickness will lead to a decrease in the transmittance of the glass ceramic, thus deteriorating its transmittance performance. "Unequal thickness" means that the reinforced glass ceramic includes at least two parts with different thicknesses.

[0023] As an alternative implementation, the composition at the center of the reinforced glass-ceramic, based on the mass percentage of oxides, comprises:

[0024] SiO2: 25.00%~55.00%, Al2O3: 30.00%~55.00%, ZrO2: 3.00%~8.00%, MgO: 2.00%~5.00%, ZnO: 5.00%~15.00%, Na2O: 1.00%~10.0 0%, K2O: 0% to 5.00%, Li2O: 1.00% to 6.00%, CaO: 0% to 6.00%, B2O3: 0% to 10.00%, BaO: 0% to 10.00%, Y2O3: 0% to 6.00%, La2O3: 0% to 12.00%.

[0025] By adjusting and controlling the content range of each oxide component, it is beneficial to ensure that the strengthened glass ceramics meet the desired crystal phase structure, and at the same time, it is beneficial to ensure that the strengthened glass ceramics obtain excellent optical properties and high intrinsic strength.

[0026] As an alternative implementation, the composition at the center of the reinforced glass-ceramic, based on the mass percentage of oxides, comprises:

[0027] The mass percentage of SiO2 is 30.00% to 42.00%, preferably 35.00% to 40.00%; and / or, the mass percentage of Al2O3 is 32.00% to 42.00%, preferably 34.00% to 42.00%; and / or, the mass percentage of ZrO2 is 4.00% to 7.00%, preferably 5.00% to 6.00%. %; and / or, the mass percentage of MgO is 2.50% to 4.00%, preferably 2.50% to 3.50%; and / or, the mass percentage of ZnO is 9.00% to 13.00%, preferably 9.00% to 11.00%; and / or, the mass percentage of Na2O is 1.00% to 8.00%, preferably 2.00% to 6.00%; and / or, K The mass percentage of K₂O is 0% to 3.00%, preferably; the mass percentage of K₂O is 0% to 1.00%; and / or, the mass percentage of Li₂O is 1.00% to 4.00%, preferably, the mass percentage of Li₂O is 2.00% to 3.00%; and / or, the mass percentage of CaO is 0% to 3.00%, preferably, the mass percentage of CaO is 0% to 1.50%; and / or, the mass percentage of B₂O₃ is 0% to 8.00%, preferably... The composition is selected as follows: B2O3 has a mass percentage of 0% to 4.00%; and / or, BaO has a mass percentage of 0% to 7.00%, preferably, BaO has a mass percentage of 0% to 4.00%; and / or, Y2O3 has a mass percentage of 0% to 4.00%, preferably, Y2O3 has a mass percentage of 0% to 2.00%; and / or, La2O3 has a mass percentage of 0% to 5.00%, preferably, La2O3 has a mass percentage of 0% to 3.00%.

[0028] As an alternative implementation, the composition at the center of the reinforced glass-ceramic, based on the mass percentage of oxides, comprises:

[0029] The mass percentage of SiO2 is 37.08%, 36.87%, 33.23%, 37.43%, 37.40%, 38.33%, 36.05%, 35.67%, 32.39%, 37.50%, 35.64%, 37.32%, or 36.31%; and / or,

[0030] The mass percentages of Al2O3 are 35.83%, 36.98%, 36.27%, 37.52%, 36.60%, 37.07%, 34.84%, 34.55%, 35.88%, 38.63%, 36.23%, or 35.10%; and / or,

[0031] The mass percentage of ZrO2 is 5.69%, 5.65%, 5.61%, 5.74%, 5.81%, 5.89%, 5.54%, 5.48%, 5.76%, 5.72%, 5.99%, or 5.58%; and / or,

[0032] The mass percentage of MgO is 3.00%, 2.98%, 3.04%, 3.03%, 3.06%, 3.10%, 2.92%, 2.89%, 3.01%, 3.27%, or 2.94%; and / or,

[0033] The ZnO mass percentage is 10.77%, 10.71%, 10.55%, 10.87%, 11.01%, 11.15%, 10.46%, 10.37%, 12.50%, 10.82%, 11.33%, or 10.54%; and / or,

[0034] The mass percentage of Na₂O is 2.86%, 2.85%, 2.89%, 3.00%, 1.69%, 2.79%, 2.76%, 3.31%, 4.61%, 3.01%, or 8.00%; and / or,

[0035] Preferably, it does not contain K2O; and / or,

[0036] The mass percentage of Li2O is 2.35%, 1.55%, 1.50%, 1.77%, 1.60%, 1.62%, 2.28%, 2.27%, 2.24%, 1.60%, 1.57%, 2.85%, or 1.53%; and / or,

[0037] The mass percentage of CaO is 0%, 0.75%, 1.15%, or 0.92%; and / or,

[0038] The mass percentage of B2O3 is 0% or 7.07%; and / or,

[0039] The mass percentage of BaO is 2.42%, 2.41%, 6.94%, 0%, 2.35%, or 2.32%; and / or,

[0040] The mass percentage of Y2O3 is 0%, 1.52%, or 0.60%; and / or,

[0041] The mass percentage of La2O3 is 0%, 2.17%, or 3.69%.

[0042] As an optional implementation, the mass percentages of Na₂O [Na₂O] and Li₂O [Li₂O] in the central composition of the reinforced glass-ceramic, based on the mass percentages of oxides, satisfy the following relationship: [Na₂O] / [Li₂O] = 0.60–6.00, preferably 0.90–5.00, more preferably 1.00–3.00; and / or

[0043] In the composition at the center of the reinforced glass ceramic, the mass percentage of Li2O [Li2O] and the mass percentage of SiO2 [SiO2] satisfy the following relationship: [Li2O] / [SiO2] = 0.03~0.20, preferably 0.04~0.15, more preferably 0.04~0.10.

[0044] By adjusting and controlling the content range of each oxide component, and by adjusting and controlling the ratio between each oxide component, especially the mass percentage relationship between Na2O and Li2O and between Li2O and SiO2, it is beneficial to improve the intrinsic strength and chemical strengthening effect of glass ceramics, thereby obtaining strengthened glass ceramics with excellent mechanical strength properties.

[0045] As an optional implementation, the average crystal size of the strengthened glass-ceramic does not exceed 20.0 nm, preferably 1.0 nm to 10.0 nm, more preferably 4.0 nm to 9.0 nm, and even more preferably 4.0 nm to 8.0 nm; and / or

[0046] The total content of crystalline phase in the reinforced glass-ceramic is 25% to 60% by mass percentage, preferably 30% to 55%, and more preferably 40% to 50%.

[0047] By ensuring that the glass-ceramic meets the desired total crystalline phase content / crystallinity and appropriate average crystal size, it is beneficial to maintain excellent optical properties while satisfying excellent mechanical strength and high intrinsic strength.

[0048] As an optional implementation, the average crystal size in the strengthened glass-ceramic is 5.0 nm, 6.8 nm, 6.4 nm, 6.5 nm, 8.1 nm, 7.0 nm, 6.1 nm, 5.1 nm, or 6.2 nm; and / or

[0049] The total content of crystalline phase in the reinforced glass-ceramic, by mass percentage, is 48.69%, 45.11%, 49.52%, 47.85%, 54.07%, 51.56%, 45.49%, 44.77%, 52.28%, 35.52%, 48.75%, or 44.33%.

[0050] As an optional embodiment, the reinforced glass ceramic is transparent in the visible light wavelength range. Preferably, at a thickness of 0.90 mm, the transmittance of the reinforced glass ceramic for 550 nm wavelength light is ≥85.00%, and more preferably ≥87.00%.

[0051] Reinforced glass ceramics that meet this transmittance standard can ensure good light transmission and transparency, making them suitable for use in electronic device displays that require high display quality.

[0052] As an optional embodiment, the reinforced glass-ceramic has a Vickers hardness greater than or equal to 750 kgf / mm². 2 Preferably, the Vickers hardness of the reinforced glass-ceramic is greater than or equal to 790 kgf / mm². 2 ; and / or,

[0053] The fracture toughness of the reinforced glass-ceramic is greater than or equal to 1.00 MPa·m. 0.5 Preferably, the fracture toughness value of the reinforced glass-ceramic is greater than or equal to 1.20 MPa·m. 0.5 More preferably, the fracture toughness value of the reinforced glass-ceramic is greater than or equal to 1.50 MPa·m. 0.5 ; and / or,

[0054] The reinforced glass-ceramic has a |CT_AV| not exceeding 60.00 MPa, preferably a |CT_AV| of 4.00 MPa to 55.00 MPa, and more preferably a |CT_AV| of 4.00 MPa to 20.00 MPa, where |CT_AV| is the absolute value of the average tensile stress; and / or,

[0055] The reinforced glass ceramic has a |CT_CV| of no more than 75.00 MPa, preferably a |CT_CV| of 5.00 MPa to 70.00 MPa, and more preferably a |CT_CV| of 6.00 MPa to 25.00 MPa, where |CT_CV| is the absolute value of the maximum tensile stress.

[0056] By endowing reinforced glass ceramics with high Vickers hardness and fracture toughness, they are less prone to breakage under compression or impact, thus improving their compressive strength. Furthermore, by conforming the reinforced glass ceramics to a suitable stress structure, the effect of the stress structure on improving mechanical strength properties is maximized, especially the improvement effect on the excellent compressive strength performance to be achieved in this application.

[0057] As an optional embodiment, the reinforced glass-ceramic has a Vickers hardness of 840 kgf / mm². 2 848kgf / mm 2 855kgf / mm2 879kgf / mm 2 889kgf / mm 2 836kgf / mm 2 911 kgf / mm 2 897kgf / mm 2 807 kgf / mm 2 894 kgf / mm 2 883 kgf / mm 2 873 kgf / mm 2 795kgf / mm 2 863 kgf / mm 2 850kgf / mm 2 856 kgf / mm 2 Or 860 kgf / mm 2 ; and / or,

[0058] The fracture toughness of the reinforced glass-ceramic is 1.64 MPa·m. 0.5 1.65 MPa·m 0.5 1.66 MPa·m 0.5 1.70 MPa·m 0.5 1.71 MPa·m 0.5 1.63 MPa·m 0.5 1.74 MPa·m 0.5 1.72 MPa·m 0.5 1.59 MPa·m 0.5 1.69 MPa·m 0.5 1.57 MPa·m 0.5 Or 1.67 MPa·m 0.5 ; and / or,

[0059] The |CT_AV| of the strengthened glass ceramic is 6.68 MPa, 5.85 MPa, 12.45 MPa, 5.45 MPa, 7.33 MPa, 7.79 MPa, 10.91 MPa, 14.64 MPa, 9.98 MPa, 6.25 MPa, 13.15 MPa, 8.58 MPa, 6.33 MPa, 7.91 MPa, 10.75 MPa, 12.77 MPa, 13.58 MPa, 9.47 MPa, or 7.98 MPa; and / or,

[0060] The |CT_CV| of the strengthened glass ceramic is 7.87MPa, 6.96MPa, 15.32MPa, 6.84MPa, 8.12MPa, 9.01MPa, 11.79MPa, 17.92MPa, 11.70MPa, 7.76MPa, 15.90MPa, 9.45MPa, 8.68MPa, 9.13MPa, 12.07MPa, 14.12MPa, 15.74MPa, 10.75MPa, or 9.02MPa.

[0061] As an optional implementation, a 10mm diameter round-headed metal pressure bar is used to apply a load vertically downward at a rate of 10mm / min, pressing the center of the main surface of the reinforced glass ceramic, and testing the static compressive strength of the single bar that the reinforced glass ceramic can withstand. The static compressive strength of the single bar that the reinforced glass ceramic can withstand is greater than 800N.

[0062] As an optional implementation, the reinforced glass-ceramic has a fracture toughness of not less than 1.40 MPa·m. 0.5 The glass-ceramic is prepared by chemical strengthening treatment, preferably wherein the strengthened glass-ceramic has a fracture toughness of not less than 1.40 MPa·m. 0.5 The glass-ceramic is prepared by a single-step chemical strengthening treatment, more preferably by a fracture toughness of not less than 1.40 MPa·m. 0.5 The glass-ceramic is placed in a molten salt bath containing potassium salt with a mass percentage of greater than or equal to 90% to undergo a single-step chemical strengthening treatment, thereby obtaining the strengthened glass-ceramic.

[0063] In a second aspect, a cover glass is provided, said cover glass being made of reinforced glass ceramic as described in any embodiment of the first aspect.

[0064] Thirdly, an electronic device is provided, the electronic device comprising the reinforced glass ceramic as described in any embodiment of the first aspect.

[0065] As an alternative embodiment, the electronic device includes a housing assembled on the outside of the electronic device, the housing comprising reinforced glass-ceramic as described in any embodiment of the first aspect.

[0066] As an alternative embodiment, the housing includes a display cover assembled on the front side of the electronic device, the display cover comprising reinforced glass-ceramic as described in any embodiment of the first aspect.

[0067] As an alternative embodiment, the housing includes a rear cover assembled to the rear side of the electronic device, the rear cover comprising reinforced glass-ceramic as described in any embodiment of the first aspect.

[0068] As an alternative embodiment, the electronic device further includes a camera assembly located inside the housing, the housing including a camera protective cover covering the camera assembly, the camera protective cover comprising reinforced glass-ceramic as described in any embodiment of the first aspect.

[0069] As an alternative embodiment, the electronic device further includes a mid-frame comprising reinforced glass-ceramic as described in any embodiment of the first aspect.

[0070] In some embodiments, the housing may be partially or entirely made of reinforced glass-ceramic. The electronic device in this application may have one or more of the following components—display cover, back cover, camera protective cover, and mid-frame—that are made of reinforced glass-ceramic as described in any embodiment of the first aspect.

[0071] Fourthly, a glass device is provided, the glass device comprising the reinforced glass ceramic as described in any embodiment of the first aspect.

[0072] Compared with the prior art, one or more of the above-mentioned technical solutions provided in this application have the following advantages: This application uses zinc-aluminum spinel-magnesium-aluminum spinel solid solution as the main crystalline phase of the glass-ceramic, enabling the glass-ceramic to obtain high intrinsic strength. Furthermore, by chemically strengthening the glass-ceramic with a thickness greater than 0.7 mm and containing specific amounts of Li and Na ions, and ensuring that the surface composition of the resulting strengthened glass-ceramic meets specific requirements, the compressive strength of the strengthened glass-ceramic is significantly improved, resulting in excellent extrusion resistance. Applying this strengthened glass-ceramic to electronic devices enables the electronic devices to meet application environments with high compressive strength requirements, such as better matching the application requirements in aquatic environments (e.g., deep-sea environments), and thus allowing for application in deep-water environments. Attached Figure Description

[0073] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0074] Figure 1 Comparison of XRD patterns of glass ceramics and reinforced glass ceramics provided in Embodiment 1 of this application;

[0075] Figure 2 A comparison diagram of the transmittance curves of the glass ceramic and the reinforced glass ceramic provided in Example 1 of this application;

[0076] Figure 3 This is a schematic diagram of the process of single-bar static compressive strength testing provided in the embodiments of this application, wherein 30 is the pressure bar, 31 is the glass-ceramic sample / piece to be tested, and 32 is the fixture.

[0077] Figure 4 This is a schematic diagram of the fixture used for single-rod static pressure strength testing provided in an embodiment of this application.

[0078] Figure 5 A cross-sectional structural schematic diagram of the fixture used for single-rod static pressure strength testing provided in an embodiment of this application.

[0079] Figure 6 The image shows the morphology of the reinforced glass ceramic provided in this application after a single-bar static compressive strength test.

[0080] Figure 7 This is a schematic diagram of the front structure of the electronic device mentioned in the embodiments of this application.

[0081] Figure 8 This is a schematic diagram of the rear structure of the electronic device mentioned in the embodiments of this application.

[0082] Figure 9 This is a schematic diagram of the structure of the electronic device mentioned in the embodiments of this application. Figure 1 .

[0083] Figure 10 This is a schematic diagram of the structure of the electronic device mentioned in the embodiments of this application. Figure 2 .

[0084] Figure 11 This is a schematic diagram of the structure of the reinforced glass-ceramic according to an embodiment of this application; where t is the thickness of the glass and d is K. + Diffusion depth DOL_K; 20 is the reinforced glass ceramic, 21 is the main surface of the reinforced glass ceramic, 22 is the tensile stress layer, and 23 is the compressive stress layer.

[0085] Reference numerals: 1-Outer shell; 11-Display cover; 12-Rear cover; 13-Camera protective cover; 2-Camera assembly; 3-Middle frame; 4-Display module. Detailed Implementation

[0086] The embodiments of this application will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of this application. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0087] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the ranges, the endpoint values ​​of the ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein. The terms "optional" and "optional" mean that they may or may not be included (or may or may not be present). The term "and / or" as used herein is inclusive; for example, "A and / or B" means only A, or only B, or both A and B.

[0088] Terminology and testing methods:

[0089] In this application, glass-ceramics are a type of solid composite material that simultaneously contains a glassy phase and a crystalline phase (or microcrystalline phase, crystalline phase, or crystal phase) prepared by targeted and controlled heat treatment of a substrate glass. Glass-ceramics are also known as microcrystalline glass or crystallized glass.

[0090] In this application, reinforced glass-ceramics refer to solid composite materials obtained by chemically strengthening glass-ceramics. It should be understood that during chemical strengthening, alkali metal ions with large ionic radii (e.g., potassium or sodium ions) in the molten salt bath (or molten salt bath) will replace alkali metal ions with small ionic radii (e.g., sodium or lithium ions) in the glass-ceramics, thereby generating a volume difference in exchange ions and producing compressive stress (or compressive stress) on the surface of the glass-ceramics.

[0091] In this application, the substrate glass refers to glass that has not undergone nucleation treatment, crystallization treatment, or strengthening treatment, or it is also called base glass.

[0092] In this application, the composition at the center of the reinforced glass ceramic refers to the composition at or near the center of the depth or thickness of the reinforced glass ceramic, that is, the composition of the region in the reinforced glass ceramic that has not undergone ion exchange. It should be understood that the composition at the center of the reinforced glass ceramic is the same as or substantially the same as the composition of the glass ceramic used to prepare the reinforced glass ceramic but which has not yet undergone chemical strengthening treatment.

[0093] In this application, the main crystalline phase (or principal crystalline phase) refers to a crystalline phase that has a higher weight content (or weight percentage, mass percentage) than other crystalline phases present in glass ceramics.

[0094] In this application, the total content of crystalline phases refers to the percentage of the total mass of crystalline phases or crystals in the glass ceramic to the mass of the glass ceramic, or the crystallinity of the glass ceramic.

[0095] In this application, the main surface refers to the surface with the largest surface area, such as the upper or lower surface of a horizontally placed glass-ceramic sheet.

[0096] In this application, the visible light wavelength range refers to 360nm to 740nm.

[0097] In this application, when light of a certain wavelength is irradiated onto the main surface of a glass-ceramic material, the light will be reflected, absorbed, and transmitted. The ratio of the intensity of the transmitted portion to the intensity of the incident light is the transmittance.

[0098] In this application, nucleation treatment refers to the formation of stable crystal nuclei in the substrate glass through heat treatment; crystallization treatment refers to the precipitation of target crystals or crystal phases in the substrate glass through heat treatment.

[0099] In this application, |CT_AV| refers to the absolute value of the average tensile stress, in MPa. Specifically, it refers to the absolute value of the average value of all tensile stresses in the tensile stress layer, which is obtained by testing with an SLP-2000 stress meter (or also known as a scattered light photoelastic stress meter).

[0100] In this application, |CT_CV| refers to the absolute value of the maximum tensile stress, in MPa. Specifically, it refers to the absolute value of the maximum value among all tensile stresses in the tensile stress layer, obtained by testing with an SLP-2000 stress meter.

[0101] In this application, the aforementioned stress performance testing method is as follows: An SLP 2000 stress meter is used to test the |CT_CV| and |CT_AV| of the strengthened glass ceramic. The relevant parameter settings for the stress meter are: light source wavelength of 518 nm, SOC (photoelastic coefficient) of 25.5 [(nm / cm) / MPa], refractive index of 1.60, and exposure time of 300 μsec.

[0102] In this application, SOC refers to the photoelastic coefficient. Photoelasticity mainly refers to the anisotropic birefringence phenomenon that occurs when a transparent material is subjected to stress. By measuring the photoelastic coefficient and birefringence, the value of the residual stress inside the material can be obtained.

[0103] In this application, DOL_K refers to K. + Diffusion depth, or K + The depth of the diffusion layer, also known as K + The exchange depth, specifically, refers to the distance from any primary surface of the reinforced glass-ceramic to the K value measured by EPMA. + The depth at which the slope value first equals 0.000 in the concentration distribution curve (or K element concentration distribution curve) is obtained by Shimadzu EPMA-1720HT electron probe microanalysis. In this application, the K concentration from the main surface to the interior of the reinforced glass-ceramic, measured by EPMA, is... + In the concentration distribution curve, K +After ion exchange, it diffuses into the surface of the glass-ceramic, and with increasing depth, K... + The quantity in glass ceramics decreases gradually, eventually reaching a depth where the slope of the curve first equals 0.000, at which point K... + It will no longer spread inwards.

[0104] Electron probe X-ray microscopy (EPMA) testing: A reinforced glass-ceramic sample was taken, and one side perpendicular to the main surface was mechanically ground to remove the reinforcing layer (abrasion removal of 500 μm or more), yielding a cross-sectional sample. The ground cross-section was then subjected to 30 nm carbon spraying. A focused electron beam was used to perform a line scan along a selected thickness direction on the ground cross-section to obtain the elemental composition and concentration distribution in the thickness direction. The electron probe X-ray microscopy instrument used in this application was a Shimadzu EPMA-1720HT, with an accelerating voltage of 15 kV, a probe current of 100 nA, a beam size of MIN, a step size of 1 μm, and a time of 1 s / point; a spectrophotometer RAP (Na Kα rays) and a spectrophotometer PET (K Kα rays); the tested elements were Na and K.

[0105] In this application, Vickers hardness refers to a standard for expressing the hardness of materials proposed by Robert L. Smith and George E. Sandland in 1921 at Vickers Ltd.

[0106] The Vickers hardness test method in this application is as follows: Small circular pieces of glass-ceramic or reinforced glass-ceramic with a diameter of 46 mm and a thickness of 0.9 mm are prepared. Glass samples with clean surfaces and free from visible scratches, dents, cracks, or other damage are selected as test samples / pieces. The Vickers hardness is then measured using a Vickers hardness tester. The Vickers hardness tester used in this application is the VTD405 digital display low-load Vickers hardness tester from Beijing Kewei Technology Co., Ltd. Test conditions: load 300 gf, load time 10 s, and the validity of the indentation conforms to the standard "GB / T37900-2019 Test Method for Hardness and Fracture Toughness of Ultra-thin Glass: Low-load Vickers Hardness Indentation Method". Measurements are taken at three different locations on the surface of the same test sample / piece, and the average of the three measurements is recorded as the Vickers hardness result of the test sample / piece.

[0107] In this application, the thickness of the glass-ceramic was obtained by micrometer measurement. It should be understood that, in the thickness direction, the degree of ion exchange varies gradient from the surface to the center, and the total Na-K and / or Li-Na exchange amount generally does not exceed 1.5% of the total sample mass, and the differences in ionic radii are all on the order of micrometers (pm). Therefore, the expansion effect in the thickness direction is extremely slight, and the thickness can be approximated as essentially unchanged. That is, the thickness change of the glass-ceramic before and after chemical strengthening is very small and can be basically ignored; the thickness of the glass-ceramic is essentially the same as the thickness of the strengthened glass-ceramic obtained.

[0108] In this application, the density of the glass ceramic was tested using an ALFAMIRAGE SD-200L electronic density balance from Japan. The measurement principle is Archimedes' principle.

[0109] In this application, the dimensions of the glass-ceramic sheet were tested using a two-dimensional measuring machine (instrument model: MiyuMY-YXCL-4030).

[0110] In this application, the crystal phase composition, total crystal phase content (or crystallinity), and average crystal size of the glass-ceramic were confirmed by XRD testing, as follows:

[0111] (1) XRD test: The glass ceramic or reinforced glass ceramic of this application was crushed and ground into samples with a particle size of less than 75 μm. The ground samples were tested using an X-ray diffractometer to obtain XRD diffraction peak curves and XRD diffraction data. The X-ray diffractometer used in this application is Shimadzu XRD-6100, the target material is copper, the test range is 2θ=10°-80°, the scanning speed is 2° / min, the working voltage is 40kV, and the working current is 30mA.

[0112] (2) Determination of crystal phase: XRD diffraction data were analyzed using Jade software (JADEStandard8.6) to determine the crystal phase in the sample.

[0113] (3) Determination of total crystal phase content (or crystallinity): The XRD test results (RAW format) are imported into Jade software (JADEStandard8.6) for fitting. The total crystal phase content of the sample can be determined by the formula (diffraction peak intensity / total intensity) × 100%.

[0114] (4) Determination of average crystal size: Using the XRD test results, the average crystal size (or average grain size) of the sample can be calculated according to the Scherrer formula D = Kλ / (βcosθ). Where λ is the X-ray wavelength, λ = 0.154056 nm, β is the half-width at half-maximum (FWHM) of the diffraction peak, K = 0.89, and θ is the Bragg diffraction angle. Specifically, the RAW format file output by the XRD instrument is curve-fitted in Jade software (JADE Standard 8.6). Jade outputs a fitting report. Based on the angle 2θ value and Peak FWHM value corresponding to each diffraction peak in the fitting report, the Peak FWHM value is converted to radians: β = (FWHM / 180 × 3.14). The grain size of each diffraction peak is calculated using the Scherrer formula D = Kλ / (βcosθ), and then averaged to obtain the average crystal size in the sample.

[0115] In this application, referring to the national standard GB / T7962.12-2010 "Test Methods for Colorless Optical Glass - Part 12: Intraspectral Transmittance", a haze meter was used to test the transmittance of glass ceramics. Specifically, the transmittance of five glass ceramics from the same batch to different wavelengths of light was tested using a haze meter. The average transmittance of the five glass ceramics measured at a wavelength of 550 nm was recorded as the transmittance result of the glass ceramics at 550 nm wavelength. The haze meter used in this application was a Konica Minolta CM-3600A spectrophotometer from Japan, with a transmission optical system, a planar refracting grating for beam splitting, a wavelength range of 360 nm to 740 nm, a wavelength spacing of 10 nm, and four pulsed xenon lamps as the illumination source. The ambient temperature where the instrument was placed was 24 °C, and the air humidity was 40%.

[0116] In this application, the method for testing the surface Na2O mass percentage (or surface Na2O concentration) of reinforced glass ceramics is as follows: The Na element content on the surface of the reinforced glass ceramic is measured by X-ray fluorescence spectrometry (XRF), and then the surface Na2O mass percentage is calculated as follows: Surface Na2O mass percentage = (Surface Na element content × Relative molecular mass of Na2O) / (Relative atomic mass of Na element × 2). It should be understood that the surface Na element content = Na element mass / Total element mass, and the total element mass = Total oxide mass. The X-ray fluorescence spectrometer (XRF) used is a Thermo Scientific ARL PERFORM'X, the target material is Rh (rhodium), the tube voltage is 30kV, the current is 80mA, the collimator is 0.40, the crystal is AxO3, the detector is FPC, the test range is a circle with a diameter of 29mm, and the test method is the X_UQ method in OXSAS analysis software.

[0117] In this application, the method for testing the surface K2O mass percentage (or surface K2O concentration) of reinforced glass ceramics is as follows: the K element content on the surface of the reinforced glass ceramics is measured by X-ray fluorescence spectrometry (XRF), and then the surface K2O mass percentage is calculated, referring to the calculation method for the surface Na2O mass percentage. The X-ray fluorescence spectrometer (XRF) used is a Thermo Scientific ARL PERFORM'X, the target material is Rh (rhodium), the tube voltage is 40kV, the current is 60mA, the collimator is 0.15, the crystal is LiF200, the detector is FPC, the test range is a circle with a diameter of 29mm, and the test method is the X_UQ method in OXSAS analysis software.

[0118] In this application, the XRF instrument was used for standard-free testing, and the concentration of elements with atomic numbers 6 and below or their oxides in the reinforced glass ceramics was not tested. The surface K2O mass percentage of the reinforced glass ceramics = K2O mass / total oxide mass, and the surface Na2O mass percentage of the reinforced glass ceramics = Na2O mass / total oxide mass. The oxides include SiO2, Al2O3, ZrO2, Na2O, K2O, and other oxides that can be accurately measured by XRF, but do not include the content of oxides such as B2O3 that cannot be accurately measured by XRF.

[0119] In this application, when using an XRF instrument for testing, the reinforced glass ceramic sheet is simply cut into a suitable size (e.g., 34mm*34mm), placed flat in the sample box, and the test aperture is covered before testing.

[0120] In this application, the fracture toughness test is conducted according to the standard GB / T 37900-2019 Test Method for Hardness and Fracture Toughness of Ultra-thin Glass - Small Load Vickers Hardness Indentation Method.

[0121] Specifically, indentations are prepared using the same method as for measuring Vickers hardness. The crack lengths 2C1 and 2C2 along the diagonal direction of the indentation are measured, and their maximum values ​​must not exceed the thickness of the glass. At least five effective indentation morphologies are measured on the surface of one specimen, and their average value is calculated as the final result value for that specimen.

[0122] Formula for calculating indentation fracture toughness:

[0123]

[0124] Wherein, IFR: indentation fracture toughness, the unit is 1 / 2 quadrillion MPa·m 0.5E: Elastic modulus of the specimen, in gigapascals (GPa); 2C1, 2C2: Crack propagation length in the diagonal direction of the indentation, in millimeters (mm); d1, d2: Diagonal length of the indentation, in millimeters (mm); F: Test load value, in newtons (N).

[0125] In this application, the single-bar static compressive strength test involves placing the reinforced glass-ceramic sample to be tested inside a custom-made fixture (e.g., Figure 3 As shown), place it on the bottom ring of the tensile testing machine (LT-850A), start the testing software, and set the moving speed of the extrusion bar (bar diameter 10mm, ball head diameter 10mm) to 10mm / min. Click "Start Test." The extrusion bar will apply force to the center of the reinforced glass-ceramic sample at the set moving speed until the reinforced glass-ceramic sample breaks. The test process is as follows. Figure 3 As shown.

[0126] The testing software will automatically read the force (N) at which the reinforced glass-ceramic sample breaks and record it as the single-bar static compressive strength it can withstand. Ten reinforced glass-ceramic samples in the same state are tested, and the average value of the test results is taken as the single-bar static compressive strength of the reinforced glass-ceramic sample to be tested.

[0127] The custom-made fixture used in this test method is a cylindrical fixture with a diameter of 65mm and a height of 20mm. The specific structure of this custom-made fixture is as follows: Figure 4 , Figure 5 Wherein, Φ1 = 65mm, Φ2 = 46.02mm, Φ3 = 44mm, h1 = 20mm, h2 = the thickness of the reinforced glass-ceramic sample to be tested, and h3 = 15mm. The height h2 of the sample placement groove inside the custom fixture is equal to the thickness of the reinforced glass-ceramic sample to be tested, allowing the sample to fit perfectly into the fixture. The stepped blind hole for placing the sample for testing within the custom fixture is coaxial with the fixture. The fixture is made of acrylic material.

[0128] While current glass ceramics outperform ordinary glass in terms of performance, their compressive strength still needs further improvement.

[0129] Unrestricted by any theory, spinel crystals possess excellent properties such as high hardness and high modulus. By using glass-ceramics with spinel crystal phase as the main crystal phase for chemical strengthening, reinforced glass-ceramics can be prepared. Compared with ordinary glass, this method is more conducive to obtaining reinforced glass-ceramic materials with excellent extrusion resistance.

[0130] The general chemical formula of spinel crystals is AB₂O₄, where A is a divalent metal ion such as Zn, Fe, or Mg with tetrahedral coordination, and B is a metal ion such as Al, Cr, or Fe with octahedral coordination. Because Al-O, Mg-O, and Zn-O can all form strong ionic bonds, spinel has a robust structure, high hardness, and stable chemical properties. The Mohs hardness of spinel crystals is generally between 7 and 8, close to 8. Therefore, theoretically, by controllably precipitating zinc spinel (or zinc-aluminum spinel) and / or magnesium spinel (or magnesium-aluminum spinel) and / or zinc-magnesium spinel solid solution (Zn,Mg)Al₂O₄ in glass, spinel glass ceramics with excellent mechanical properties can be obtained.

[0131] Therefore, this application employs a glass-ceramic containing spinel crystals that meets specific composition and structure requirements to prepare a reinforced glass-ceramic material with desired compressive strength. The glass-ceramic used in this application is rich in high-strength spinel crystals and possesses a high-strength glass phase structure. Through the synergistic effect of the crystal phase structure and the glass phase structure, the glass-ceramic is endowed with high inherent strength or intrinsic strength. This application further enhances the glass-ceramic by chemically strengthening its surface composition to meet specific requirements, thereby endowing the resulting reinforced glass-ceramic with a stress structure and stress level that achieves high compressive strength, thus obtaining a reinforced glass-ceramic with excellent compressive strength.

[0132] Understandably, "surface composition" in this application can refer to the material composition or component distribution of the surface of the substrate glass, glass ceramic, or reinforced glass ceramic. It can also refer to the mass percentage, molar percentage, mass percentage relationship between two or more material components, mass content relationship between two or more material components, molar content relationship between two or more material components, a combination of the foregoing, and others. For example: the mass percentage of Na2O or K2O on the surface of reinforced glass ceramic; or the mass percentage of Na2O and K2O on the surface of reinforced glass ceramic; or the K2O content calculated from the main surface of the reinforced glass ceramic. + (K element) diffusion depth.

[0133] In some embodiments of this application, a reinforced glass ceramic is provided, wherein the reinforced glass ceramic is plate-shaped, and the thickness t of the reinforced glass ceramic is greater than 0.7 mm, preferably not less than 0.8 mm, and more preferably not less than 0.9 mm.

[0134] The reinforced glass-ceramic comprises a primary crystalline phase of zinc aluminum spinel-magnesium aluminum spinel solid solution and a secondary crystalline phase of zirconium oxide; the reinforced glass-ceramic has a compressive stress layer on its surface and tensile stress inside.

[0135] The composition at the center of the reinforced glass ceramic, based on the mass percentage of oxides, includes Li2O and Na2O, wherein the mass percentage of Li2O is greater than 1.00%, preferably greater than 1.30%, more preferably greater than or equal to 1.50%, and the mass percentage of Na2O is greater than 1.00%, preferably greater than 2.00%, more preferably greater than 2.70%.

[0136] As determined by XRF, the surface K2O mass percentage of the reinforced glass ceramic is 2.00% to 7.50% based on the mass percentage of oxides, preferably 2.50% to 6.50%, and more preferably 3.00% to 6.00%.

[0137] As determined by XRF, the surface Na2O mass percentage of the reinforced glass ceramic is less than or equal to 0.010% based on the mass percentage of oxides, preferably less than or equal to 0.005%, and more preferably less than or equal to 0.002%.

[0138] EPMA measurements show that the reinforced glass-ceramic satisfies the following properties: 5.00 μm ≤ DOL_K ≤ 20.00 μm, preferably 5.50 μm ≤ DOL_K ≤ 18.00 μm, and more preferably 6.00 μm ≤ DOL_K ≤ 16.00 μm, where DOL_K is K measured from the main surface of the reinforced glass-ceramic. + Diffusion depth.

[0139] In this application, by simultaneously containing a certain amount of Li2O and Na2O in the glass ceramic, not only can the fracture toughness of the glass ceramic be increased and the overall strength of the glass phase (or also known as the residual glass phase) be improved, making it less prone to breakage when subjected to compression or impact, but it is also beneficial to improve the chemical strengthening effect of the glass ceramic.

[0140] This application utilizes a zinc-aluminum spinel-magnesium-aluminum spinel solid solution as the main crystalline phase of the glass-ceramic, thereby achieving high intrinsic strength. Furthermore, by chemically strengthening this glass-ceramic with a thickness greater than 0.7 mm and containing specific amounts of Li and Na ions, and ensuring the surface composition of the resulting strengthened glass-ceramic meets specific requirements, the compressive strength of the strengthened glass-ceramic is significantly improved, resulting in excellent extrusion resistance. In this application, (Zn,Mg)Al2O4 is used to represent the zinc-aluminum spinel-magnesium-aluminum spinel solid solution (or also referred to as zinc-magnesium spinel solid solution, zinc-spinel-magnesium spinel solid solution, or zinc-magnesium-aluminum spinel solid solution). Applying this strengthened glass-ceramic to electronic devices enables the devices to meet the application requirements of environments with high compressive strength, such as better matching the application requirements of aquatic environments (e.g., deep-sea environments), and thus making it suitable for deep-sea applications.

[0141] In some embodiments, the surface K2O mass percentage of the reinforced glass ceramic can be 3.20%–5.80%, 3.80%–5.60%, or 4.10%–5.5%. In some embodiments, the surface K2O mass percentage of the reinforced glass ceramic can be 2.00%, 2.50%, 3.00%, 3.50%, 4.00%, 4.50%, 5.00%, 5.50%, 6.00%, 6.50%, 7.00%, 7.50%, 3.91%, 4.16%, 3.96%, 4.12%, 4.53%, 3.24%, 4.55%, 4.51%, 4.68%, 5.75%, 3.85%, 4.48%, 5.69%, 5.45%, 5.57%, or 5.54%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the reinforced glass ceramic with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the reinforced glass ceramic with the desired performance of this application is obtained.

[0142] In some embodiments, the surface Na2O mass percentage of the reinforced glass ceramic can be 0.000%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, 0.008%, 0.009%, or 0.010%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the reinforced glass ceramic with the desired performance of this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the reinforced glass ceramic with the desired performance of this application is obtained.

[0143] In some embodiments, the DOL_K of the reinforced glass ceramic can satisfy: 10.00μm≤DOL_K≤17.00μm, 5.00μm≤DOL_K≤10.00μm, 17.00μm≤DOL_K≤20.00μm, 11.00μm≤DOL_K≤15.00μm, 12.00μm≤DOL_K≤14.00μm, or 12.00μm≤DOL_K≤13.00μm. In some embodiments, the DOL_K of the strengthened glass-ceramic can be 5.00 μm, 5.50 μm, 6.00 μm, 6.50 μm, 7.00 μm, 7.50 μm, 8.00 μm, 8.50 μm, 9.00 μm, 9.50 μm, 10.00 μm, 10.50 μm, 11.00 μm, 11.50 μm, 12.00 μm, 12.50 μm, 13.00 μm, 13.50 μm, 14.00 μm, 14.50 μm, 15.00 μm, 15.50 μm, 16.00 μm, 16.50 μm, 17.00 μm, 17.50 μm, 18.00 μm, The micrometer values ​​can be 18.50 μm, 19.00 μm, 19.50 μm, 20.00 μm, 7.70 μm, 9.60 μm, 10.30 μm, 8.40 μm, 10.40 μm, 8.60 μm, 14.10 μm, 12.50 μm, 6.20 μm, 9.80 μm, 12.80 μm, 9.10 μm, 8.30 μm, 8.80 μm, 11.40 μm, 12.80 μm, 10.60 μm, 11.80 μm, or 11.70 μm, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the strengthened glass-ceramic with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramic with the desired performance of this application is obtained.

[0144] In some embodiments, the thickness t of the reinforced glass ceramic can be not less than 0.95 mm, not less than 1.00 mm, not less than 1.05 mm, 0.85 mm to 2.00 mm, or 0.90 mm to 1.50 mm. The thickness of the reinforced glass ceramic is positively correlated with its compressive strength; the thicker the reinforced glass ceramic, the better its compressive strength. When the thickness of the reinforced glass ceramic is small, its compressive strength will significantly decrease. By controlling the thickness of the reinforced glass ceramic to be not less than 0.70 mm, it is beneficial to ensure that the reinforced glass ceramic has good compressive strength. However, if the thickness of the reinforced glass ceramic is too large, on the one hand, it will lead to an increase in weight, which is not conducive to achieving the thinness and lightness of electronic devices; on the other hand, too large a thickness will lead to a decrease in the transmittance of the glass ceramic, thus worsening its transmittance performance. In some embodiments, the thickness of the reinforced glass ceramic of this application can be 0.80 mm, 0.85 mm, 0.90 mm, 1.00 mm, 1.10 mm, 1.20 mm, 1.30 mm, 1.40 mm, or 1.50 mm, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the reinforced glass ceramic with the desired performance of this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the reinforced glass ceramic with the desired performance of this application is obtained.

[0145] In some embodiments of this application, the reinforced glass ceramic or the glass ceramic used to prepare the reinforced glass ceramic is 2D, 2.5D, 3D, or irregularly shaped; that is, the glass ceramic can be a 2D, 2.5D, 3D, or irregularly shaped product, and the reinforced glass ceramic can also be a 2D, 2.5D, 3D, or irregularly shaped product; and / or, the reinforced glass ceramic or the glass ceramic used to prepare the reinforced glass ceramic is of uniform thickness or unequal thickness. "Unequal thickness" means that the reinforced glass ceramic or the glass ceramic used to prepare the reinforced glass ceramic comprises at least two portions with different thicknesses.

[0146] In some embodiments of this application, the reinforced glass-ceramic satisfies the following condition: when tested using EPMA, the concentration of potassium (K) along the thickness direction of the reinforced glass-ceramic shows a non-linear decreasing trend from the main surface to the center of the reinforced glass-ceramic. In this application, the K concentration from the main surface to the interior of the reinforced glass-ceramic, measured by EPMA, is... + In the concentration distribution curve, K + After ion exchange, it diffuses into the surface of the glass-ceramic, and with increasing depth, K... + The quantity in glass ceramics decreases gradually, eventually reaching a depth where the slope of the curve first equals 0.000, at which point K... + It will no longer spread inwards.

[0147] It should be understood that the reinforced glass-ceramic of this application is made by chemically strengthening glass-ceramic, and the composition at the center of the reinforced glass-ceramic is the same as or substantially the same as the composition of the original glass-ceramic. Compared to the glass-ceramic before chemical strengthening (which involves ion exchange), the composition at the surface of the glass-ceramic product after chemical strengthening may differ from that before chemical strengthening. This is because, during chemical strengthening, a certain type of alkali metal ion (e.g., Li) is present at the surface of the newly formed glass-ceramic. + Or Na + They will be respectively affected by larger alkali metal ions (e.g., Na+). + or K + However, in embodiments, the glass composition and phase composition at or near the center of the depth or thickness of the glass-ceramic article will still have the composition and phase composition of the newly formed glass-ceramic. That is, in this application, the composition (e.g., the composition of the tensile stress layer) and phase composition at the center of the strengthened glass-ceramic are the same as or substantially the same as those of the untreated glass-ceramic.

[0148] Meanwhile, in this application, the glass ceramic used to prepare the reinforced glass ceramic can be obtained by heat treatment of the substrate glass, and the composition of the substrate glass is the same as or substantially the same as the composition of the glass ceramic in terms of the mass percentage of oxides.

[0149] In some embodiments of this application, the composition at the center of the reinforced glass ceramic, or the composition of the glass ceramic used to prepare the reinforced glass ceramic, or the composition of the substrate glass, contains at least 30.00% Al2O3 by mass percentage.

[0150] In this application, by controlling the mass percentage of Al2O3 in the glass-ceramic to be greater than or equal to 30%, it is possible to ensure the precipitation of the desired amount of main crystalline phase, thereby enabling the glass-ceramic to obtain high intrinsic strength (or inherent strength). Furthermore, it ensures that the glass phase also contains a certain amount of alumina. The alumina present in the glass phase can enter the glass network structure as [AlO4] tetrahedra, forming a unified network with [SiO4], enhancing the network's connectivity and improving the strength and stability of the glass network structure, thus further improving the intrinsic strength of the glass-ceramic. Simultaneously, the [AlO4] tetrahedra in the glass phase can appropriately expand the ion exchange channels, improving the chemical strengthening effect of the glass-ceramic and making it more conducive to obtaining strengthened glass-ceramics with excellent mechanical strength properties.

[0151] In some embodiments of this application, the composition at the center of the reinforced glass ceramic, or the composition of the glass ceramic used to prepare the reinforced glass ceramic, or the composition of the substrate glass, contains ZrO2 at a mass percentage greater than or equal to 3.00%.

[0152] In this application, by controlling the mass percentage of zirconium oxide in the glass-ceramic to be greater than or equal to 3.00%, the intrinsic strength of the glass-ceramic is improved, and the surface stress level of the resulting strengthened glass-ceramic is increased. On one hand, zirconium oxide, as a nucleating agent, disperses in the glass phase as nanoscale grains after heat treatment, increasing the hardness of the glass-ceramic and effectively improving its fracture resistance. On the other hand, zirconium oxide exists in the glass phase in the form of cubic [ZrO8], which enhances interionic forces, making the glass structure more compact and thus improving the mechanical strength of the glass phase. Simultaneously, zirconium oxide significantly increases the surface compressive stress formed through ion exchange, thereby improving the surface stress level of the resulting strengthened glass-ceramic.

[0153] In some embodiments of this application, the composition at the center of the strengthened glass ceramic, or the composition of the glass ceramic used to prepare the strengthened glass ceramic, or the composition of the substrate glass, based on the mass percentage of oxides, comprises:

[0154] SiO2: 25.00%–55.00%, Al2O3: 30.00%–55.00%, ZrO2: 3.00%–8.00%, MgO: 2.00%–5.00%, ZnO: 5.00%–15.00%, Na2O: 1.00%–10.00%, K2O: 0%–5.00%, Li2O: 1.00%–6.00%, CaO: 0%–6.00%, B2O3: 0%–10.00%, BaO: 0%–10.00%, Y2O3: 0%–6.00%, La2O3: 0%–12.00%. By adjusting and controlling the content range of each oxide component, it is beneficial to ensure that the strengthened glass-ceramic meets the desired crystal phase structure, and at the same time, it is beneficial to ensure that the strengthened glass-ceramic obtains excellent optical properties and high intrinsic strength.

[0155] In this application, SiO2 is the agglomerating oxide of the glass network and an indispensable component constituting the glass network structure. Increasing the SiO2 content can increase the stability and mechanical strength of the glass, but excessive SiO2 will increase the viscosity of the substrate glass, making glass melting more difficult and thus reducing the formability of the substrate glass. In this application, the mass percentage of SiO2 in the composition of the center of the strengthened glass ceramic, the composition of the glass ceramic used to prepare the strengthened glass ceramic, or the composition of the substrate glass is 25.00% to 55.00%, preferably 30.00% to 42.00%, and more preferably 35.00% to 40.00%.

[0156] In some embodiments of this application, the SiO2 content in the core of the reinforced glass ceramic, the glass ceramic used to prepare the reinforced glass ceramic, or the substrate glass, based on the mass percentage of oxides, can be 25.00%–55.00%, 25.00%–40.00%, 40.00%–55.00%, or 30.00%–40.00%. In some embodiments of this application, the SiO2 content, by mass percentage of oxides, in the composition at the center of the strengthened glass ceramic, or in the composition of the glass ceramic used to prepare the strengthened glass ceramic, or in the composition of the substrate glass, can be 25.00%, 26.00%, 27.00%, 28.00%, 29.00%, 30.00%, 31.00%, 32.00%, 33.00%, 34.00%, 35.00%, 35.50%, 36.00%, 37.00%, 38.00%, 39.00%, 40.00%, 41.00%, 42.00%, 43.00%, 44.00%, 4... The values ​​can be 5.00%, 46.00%, 47.00%, 48.00%, 49.00%, 50.00%, 51.00%, 52.00%, 53.00%, 54.00%, 55.00%, 37.08%, 36.87%, 33.23%, 37.43%, 37.40%, 38.33%, 36.05%, 35.67%, 32.39%, 37.50%, 35.64%, 37.32%, or 36.31%, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the desired performance of the glass-ceramic or reinforced glass-ceramic is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as the desired performance of the glass-ceramic or reinforced glass-ceramic is obtained.

[0157] In this application, Al2O3 is one of the components that form the main crystalline phase, zinc-magnesium spinel, after the substrate glass crystallizes. The increase in Al2O3 promotes spinel precipitation and inhibits the precipitation of other impurity phases such as quartz, directly affecting the content of the main crystalline phase (Zn,Mg)Al2O4. As the Al2O3 content increases, the strength of the glass phase in the glass ceramic also increases, thus enhancing the mechanical properties of the glass ceramic. Simultaneously, because [AlO4] has a larger volume than [SiO4], it provides more space for ion exchange, which is beneficial for promoting chemical strengthening. However, excessive Al2O3 increases the viscosity of the substrate glass, reducing its formability and easily leading to a faster crystallization rate, causing devitrification of the substrate glass during normal cooling. In this application, the Al2O3 mass percentage in the composition of the center of the reinforced glass ceramic, the composition of the glass ceramic used to prepare the reinforced glass ceramic, or the composition of the substrate glass is 30.00% to 55.00%, preferably 32.00% to 42.00%, and more preferably 34.00% to 42.00%.

[0158] In some embodiments of this application, the Al2O3 content in the core of the reinforced glass ceramic, the glass ceramic used to prepare the reinforced glass ceramic, or the substrate glass, based on the mass percentage of oxides, can be 30.00% to 55.00%, 30.00% to 40.00%, or 40.00% to 55.00%. In some embodiments of this application, the Al2O3 content, by mass percentage of oxides, in the composition of the center of the strengthened glass-ceramic, or in the composition of the glass-ceramic used to prepare the strengthened glass-ceramic, or in the composition of the substrate glass, can be 30.00%, 31.00%, 32.00%, 33.00%, 34.00%, 34.50%, 35.00%, 35.50%, 36.00%, 36.50%, 37.00%, 38.00%, 39.00%, 40.00%, 41.00%, 42.00%, 43.00%, 44.00%, 45.00%, 46.00%, etc. The values ​​can be 0%, 47.00%, 48.00%, 49.00%, 50.00%, 51.00%, 52.00%, 53.00%, 54.00%, 54.50%, 55.00%, 35.83%, 36.98%, 36.27%, 37.52%, 36.60%, 37.07%, 34.84%, 34.55%, 35.88%, 38.63%, 36.23%, or 35.10%, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application is obtained.

[0159] In this application, ZrO2 is an effective nucleating agent. During the heat treatment of glass, ZrO2 precipitates first in the form of crystals, which then serve as nuclei for subsequent crystal growth. Within a certain glass composition range, the ZrO2 content affects glass formation, influencing the crystal shape, type, and size of the glass ceramic obtained after heat treatment. By controlling the glass composition, ZrO2 can be preferentially precipitated at the same temperature, subsequently leading to the growth of the main crystalline phase, spinel crystals. When the ZrO2 content is too low, it affects the precipitation of the main crystalline phase, zinc-magnesium spinel solid solution; when the ZrO2 content is too high, it increases the difficulty of melting the substrate glass, resulting in the formation of white unmelted material in the substrate glass. In this application, the mass percentage of ZrO2 in the composition of the center of the strengthened glass ceramic, the composition of the glass ceramic used to prepare the strengthened glass ceramic, or the composition of the substrate glass is 3.00% to 8.00%, preferably 4.00% to 7.00%, and more preferably 5.00% to 6.00%.

[0160] In some embodiments of this application, the ZrO2 content, based on the mass percentage of oxides, in the composition of the core of the strengthened glass ceramic, or in the composition of the glass ceramic used to prepare the strengthened glass ceramic, or in the composition of the substrate glass, can be 3.00%–8.00%, 3.00%–6.00%, or 6.00%–8.00%. In some embodiments of this application, the ZrO2 content, based on the mass percentage of oxides, in the composition of the core of the strengthened glass ceramic, or in the composition of the glass ceramic used to prepare the strengthened glass ceramic, or in the composition of the substrate glass, can be 3.00%, 3.20%, 3.50%, 3.70%, 4.00%, 4.20%, 4.50%, 4.70%, 5.00%, 5.20%, 5.50%, 5.70%, 6 ...3.20%, 3.50%, 3.70%, 4.00%, 3.20%, 3.50%, 3.70%, 4.00%, 3.20%, 3.50%, 3.70%, 4.70%, 5.00%, 5.20%, 5.50%, 5.70%, 6.00%, 3.20%, 3.50%, 3.70%, 3.70%, 3.70%, 3.80%, 3.00%, 3.20%, 3.50%, 3.70%, 3.70%, 3.70%, The values ​​can be 6.50%, 7.00%, 7.50%, 8.00%, 5.69%, 5.65%, 5.61%, 5.74%, 5.81%, 5.89%, 5.54%, 5.48%, 5.76%, 5.72%, 5.99%, or 5.58%, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the desired performance of the glass-ceramic or reinforced glass-ceramic is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as the desired performance of the glass-ceramic or reinforced glass-ceramic is obtained.

[0161] In this application, ZnO provides the zinc necessary for the formation of the main crystalline phase, zinc-magnesium spinel, after the substrate glass crystallizes. ZnO can reduce the coefficient of thermal expansion of the glass and improve its chemical stability, thermal stability, and refractive index. MgO provides the magnesium necessary for the formation of the main crystalline phase, zinc-magnesium spinel, after the substrate glass crystallizes. MgO can slow down the hardening rate of the glass, improving its formability; MgO can also reduce the tendency and rate of crystallization, increase the high-temperature viscosity of the glass, and improve its chemical stability and mechanical strength. However, the addition of excessive MgO and ZnO often leads to excessively large spinel grains, making it difficult to obtain glass ceramics with high transparency. In this application, the composition of the center of the reinforced glass ceramic, or the composition of the glass ceramic used to prepare the reinforced glass ceramic, or the composition of the substrate glass, is as follows: the mass percentage of ZnO is 5.00% to 15.00%, preferably 9.00% to 13.00%, more preferably 9.00% to 11.00%; and the mass percentage of MgO is 2.00% to 5.00%, preferably 2.50% to 4.00%, more preferably 2.50% to 3.50%.

[0162] In some embodiments of this application, the ZnO content, by mass percentage of oxides, in the composition of the center of the strengthened glass ceramic, or in the composition of the glass ceramic used to prepare the strengthened glass ceramic, or in the composition of the substrate glass, can be 5.00%, 5.50%, 6.00%, 6.50%, 7.00%, 7.50%, 8.00%, 8.50%, 9.00%, 9.50%, 10.00%, 10.50%, 11.00%, 11.50%, etc. The values ​​can be 12.00%, 12.50%, 13.00%, 10.77%, 10.71%, 10.55%, 10.87%, 11.01%, 11.15%, 10.46%, 10.37%, 12.50%, 10.82%, 11.33%, or 10.54%, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application is obtained.

[0163] In some embodiments of this application, the MgO content, by mass percentage of oxides, in the composition at the center of the reinforced glass-ceramic, or in the composition of the glass-ceramic used to prepare the reinforced glass-ceramic, or in the composition of the substrate glass, can be 2.00%, 2.50%, 3.00%, 3.50%, 4.00%, 4.50%, 5.00%, 2.98%, 3.04%, 3.03%, 3.06%, 3.10%, 2.92%, 2.89%, 3.01%, 3.27%, or 2.94%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or reinforced glass-ceramic with the desired properties of this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or reinforced glass-ceramic with the desired properties of this application is obtained.

[0164] In this application, increasing the Na2O content helps to obtain higher surface compressive stress and can lower the melting temperature and crystal precipitation temperature. However, excessive addition can lead to ceramization of the glass during annealing or the precipitation of other impurity phases that affect the transmittance of the glass-ceramic during heat treatment, resulting in a decrease in the transmittance of the obtained glass-ceramic. Too low a Na2O content will lead to an increase in heat treatment temperature, direct phase separation or precipitation of impurity phases during heat treatment, resulting in opaque or poorly transparent glass-ceramics. In this application, the mass percentage of Na2O in the composition of the center of the strengthened glass-ceramic, the composition of the glass-ceramic used to prepare the strengthened glass-ceramic, or the composition of the substrate glass is 1.00% to 10.00%, preferably 1.00% to 8.00%, and more preferably 2.00% to 6.00%.

[0165] In some embodiments of this application, the Na₂O content, by mass percentage of oxides, in the composition of the center of the strengthened glass-ceramic, or in the composition of the glass-ceramic used to prepare the strengthened glass-ceramic, or in the composition of the substrate glass, can be 1.00%, 1.50%, 2.00%, 2.50%, 3.00%, 3.50%, 4.00%, 4.50%, 5.00%, 5.50%, 6.00%, 6.50%, 7.00%, 7.50%, etc. The values ​​can be 0%, 8.00%, 8.50%, 9.00%, 9.50%, 10.00%, 2.86%, 2.85%, 2.89%, 3.00%, 1.69%, 2.79%, 2.76%, 3.31%, 4.61%, 3.01%, or 8.00%, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application is obtained.

[0166] In this application, Li2O helps to obtain a higher compressive stress layer depth, improve Young's modulus and fracture toughness; it can also lower the melting temperature and crystal precipitation temperature. However, excessive addition of Li2O can lead to ceramization of the glass during annealing, or the precipitation of other impurity phases that affect the transmittance of the glass-ceramic during heat treatment, or excessive crystal growth during heat treatment, resulting in a decrease in the transmittance of the obtained glass-ceramic. Insufficient Li2O addition will lead to an increase in heat treatment temperature and a decrease in deep stress. In this application, the mass percentage of Li2O in the composition of the center of the strengthened glass-ceramic, the composition of the glass-ceramic used to prepare the strengthened glass-ceramic, or the composition of the substrate glass is 1.00% to 6.00%, preferably 1.00% to 4.00%, more preferably 2.00% to 3.00%.

[0167] In some embodiments of this application, the Li2O content, by mass percentage of oxides, in the composition at the center of the reinforced glass ceramic, or in the composition of the glass ceramic used to prepare the reinforced glass ceramic, or in the composition of the substrate glass, can be 1.00%, 1.50%, 2.00%, 2.50%, 3.00%, 3.50%, 4.00%, 4.50%, 5.00%, 5.50%, 6.00%, 2.35%, 1.55%, 1.50%, 1.77%, 1.60%, 1.62%, 2.28%, 2.27%, 2.24%, 1.60%, 1.57%, 2.85%, or 1.53%, or can be a value within a range of values ​​defined by any two of the above specific values ​​as endpoints, as long as the glass ceramic or reinforced glass ceramic with the desired properties of this application can be obtained. It should be understood that, in specific implementations, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application can be obtained.

[0168] In this application, K2O is an optional component, and its mass percentage can be 0 to 5.00%, preferably 0 to 3.00%, and more preferably 0 to 1.00%. In some embodiments, it is preferable that the composition at the center of the strengthened glass ceramic, the composition of the glass ceramic used to prepare the strengthened glass ceramic, or the composition of the substrate glass does not contain K2O.

[0169] In this application, CaO is used as an optional component. Adding an appropriate amount of CaO helps reduce the viscosity of the glass, improve the formability, strain point, and Young's modulus of the substrate glass, and enhance ion exchange capacity. Simultaneously, calcium oxide can increase the gloss and transparency of the glass, reduce its crystallization tendency, and slow down the glass hardening rate. However, excessive CaO content leads to an increase in the density and CTE of the glass composition, significantly reducing the ion exchange performance of the glass ceramic. In this application, the mass percentage of CaO in the composition of the center of the strengthened glass ceramic, the composition of the glass ceramic used to prepare the strengthened glass ceramic, or the composition of the substrate glass is 0% to 6.00%, preferably 0% to 3.00%, and more preferably 0% to 1.50%.

[0170] In some embodiments of this application, the CaO content, by mass percentage of oxides, in the composition at the center of the reinforced glass-ceramic, or in the composition of the glass-ceramic used to prepare the reinforced glass-ceramic, or in the composition of the substrate glass, can be 0%, 0.50%, 1.00%, 1.50%, 2.00%, 2.50%, 3.00%, 3.50%, 4.00%, 4.50%, 5.00%, 5.50%, 6.00%, 0.75%, 1.15%, or 0.92%, or can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or reinforced glass-ceramic with the desired properties of this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or reinforced glass-ceramic with the desired properties of this application is obtained.

[0171] In this application, B2O3 is used as an optional component. An appropriate amount of B2O3 can significantly reduce the difficulty of glass melting and promote the precipitation of spinel. However, excessive addition of B2O3 can cause opacity during the heat treatment of the substrate glass to prepare glass-ceramics. Furthermore, it may lead to the precipitation of other crystalline phases that severely affect the transparency of the glass. In this application, the mass percentage of B2O3 in the composition of the center of the strengthened glass-ceramic, the composition of the glass-ceramic used to prepare the strengthened glass-ceramic, or the composition of the substrate glass is 0% to 10.00%, preferably 0% to 8.00%, and more preferably 0% to 4.00%.

[0172] In some embodiments of this application, the B2O3 content, by mass percentage of oxides, in the composition at the center of the reinforced glass-ceramic, or in the composition of the glass-ceramic used to prepare the reinforced glass-ceramic, or in the composition of the substrate glass, can be 0%, 0.50%, 1.00%, 1.50%, 2.00%, 2.50%, 3.00%, 3.50%, 4.00%, 4.50%, 5.00%, 6.00%, 7.00%, 8.00%, 9.00%, 10.00%, or 7.07%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or reinforced glass-ceramic with the desired properties of this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or reinforced glass-ceramic with the desired properties of this application is obtained.

[0173] In this application, BaO is used as an optional component. An appropriate amount of BaO can improve the glass melting effect, increase the glass density, improve Young's modulus, and inhibit grain growth to a certain extent, thus improving the optical properties of the glass ceramic. However, the presence of excessive BaO strongly inhibits the exchange process of Na and K ions. In this application, the mass percentage of BaO in the composition of the center of the strengthened glass ceramic, the composition of the glass ceramic used to prepare the strengthened glass ceramic, or the composition of the substrate glass is 0% to 10.00%, preferably 0% to 7.00%, and more preferably 0% to 4.00%.

[0174] In some embodiments of this application, the BaO content, by mass percentage, in the composition at the center of the reinforced glass-ceramic, or in the composition of the glass-ceramic used to prepare the reinforced glass-ceramic, or in the composition of the substrate glass, can be 0%, 0.50%, 1.00%, 1.50%, 2.00%, 2.50%, 3.00%, 3.50%, 4.00%, 4.50%, 5.00%, 6.00%, 7.00%, 8.00%, 9.00%, 10.00%, 2.42%, 2.41%, 6.94%, 2.35%, or 2.32%, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or reinforced glass-ceramic with the desired properties of this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or reinforced glass-ceramic with the desired properties of this application is obtained.

[0175] In this application, Y₂O₃ plays a role in making the glass structure more compact. An appropriate amount of Y₂O₃ can increase the internal packing density of the glass, thereby increasing its density and thus improving its intrinsic strength. Regarding ion exchange performance, it can enhance the Na₂O₃ content. + Li + Plasma exerts a stress effect on the unit ion exchange during chemical strengthening, but this may reduce the exchange rate. However, adding too much Y₂O₃ is detrimental to obtaining transparent spinel glass-ceramics. In this application, the mass percentage of Y₂O₃ in the composition of the center of the strengthened glass-ceramic, the composition of the glass-ceramic used to prepare the strengthened glass-ceramic, or the composition of the substrate glass is 0% to 6.00%, preferably 0% to 4.00%, and more preferably 0% to 2.00%.

[0176] In some embodiments of this application, the content of Y₂O₃ in the composition at the center of the reinforced glass-ceramic, the composition of the glass-ceramic used to prepare the reinforced glass-ceramic, or the composition of the substrate glass, based on the mass percentage of oxides, can be 0%, 0.50%, 1.00%, 1.50%, 2.00%, 2.50%, 3.00%, 3.50%, 4.00%, 4.50%, 5.00%, 5.50%, 6.00%, 1.52%, or 0.60%, or can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or reinforced glass-ceramic with the desired properties of this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or reinforced glass-ceramic with the desired properties of this application is obtained.

[0177] In this application, La2O3 is a network modifier for glass. An appropriate amount of La2O3 can increase the glass's refractive index and reduce its high-temperature viscosity, thus improving the glass melting process and eliminating inherent defects. Simultaneously, an appropriate amount of La2O3 can significantly increase the glass's Young's modulus and micro-Vickers hardness, while also improving the chemical strengthening properties of glass ceramics and enhancing the stress effect generated by unit ion exchange in strengthened glass ceramics. However, adding too much La2O3 is detrimental to obtaining transparent spinel glass ceramics. In this application, the mass percentage of La2O3 in the composition of the center of the strengthened glass ceramic, the composition of the glass ceramic used to prepare the strengthened glass ceramic, or the composition of the substrate glass is 0% to 12.00%, preferably 0% to 5.00%, and more preferably 0% to 3.00%.

[0178] In some embodiments of this application, the content of La2O3, by mass percentage of oxides, in the composition at the center of the reinforced glass-ceramic, or in the composition of the glass-ceramic used to prepare the reinforced glass-ceramic, or in the composition of the substrate glass, can be 0%, 0.50%, 1.00%, 1.50%, 2.00%, 2.50%, 3.00%, 3.50%, 4.00%, 5.00%, 6.00%, 7.00%, 8.00%, 9.00%, 10.00%, 11.00%, 12.00%, 2.17%, or 3.69%, or can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or reinforced glass-ceramic with the desired properties of this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or reinforced glass-ceramic with the desired properties of this application is obtained.

[0179] In this application, in order to obtain the reinforced glass-ceramic with excellent properties desired by this application, in addition to Y2O3 and La2O3, metal oxides of cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, or scandium, or mixtures of the aforementioned metal oxides, may be added to the composition of the glass-ceramic or the substrate glass used to prepare the reinforced glass-ceramic, as long as the glass-ceramic or reinforced glass-ceramic with the desired properties of this application can be obtained. If the aforementioned metal oxides are added to the composition of the glass-ceramic or the substrate glass used to prepare the reinforced glass-ceramic, the composition at the center of the resulting reinforced glass-ceramic should also contain these metal oxides.

[0180] In this application, by adjusting and controlling the content range of each oxide component, and by adjusting and controlling the ratio between each oxide component, especially the mass percentage relationship between Na2O and Li2O and Li2O and SiO2, it is beneficial to improve the intrinsic strength and chemical strengthening effect of glass ceramics, thereby making it easier to obtain strengthened glass ceramics with excellent mechanical strength properties.

[0181] In some embodiments of this application, the mass percentages of Na2O [Na2O] and Li2O [Li2O] in the composition at the center of the strengthened glass ceramic, the glass ceramic used to prepare the strengthened glass ceramic, or the substrate glass, based on the mass percentage of oxides, satisfy the following relationship: [Na2O] / [Li2O] = 0.60 to 6.00, preferably [Na2O] / [Li2O] = 0.90 to 5.00, more preferably [Na2O] / [Li2O] = 1.00 to 3.00.

[0182] In some embodiments, the ratio of the mass percentage of Na2O [Na2O] to the mass percentage of Li2O [Li2O] in the composition at the center of the reinforced glass-ceramic, or in the composition of the glass-ceramic used to prepare the reinforced glass-ceramic, or in the composition of the substrate glass, can be 0.60, 0.9, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00, 5.50, or 6.00, or can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application is obtained.

[0183] In some embodiments of this application, the mass percentages of Li2O [Li2O] and SiO2 [SiO2] in the composition at the center of the strengthened glass ceramic, the glass ceramic used to prepare the strengthened glass ceramic, or the substrate glass, based on the mass percentage of oxides, satisfy the following relationship: [Li2O] / [SiO2] = 0.03 to 0.20, preferably [Li2O] / [SiO2] = 0.04 to 0.15, and more preferably [Li2O] / [SiO2] = 0.04 to 0.10.

[0184] In some embodiments, the ratio of the mass percentage of Li2O [Li2O] to the mass percentage of SiO2 [SiO2] in the composition at the center of the reinforced glass-ceramic, or in the composition of the glass-ceramic used to prepare the reinforced glass-ceramic, or in the composition of the substrate glass, can be 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, or 0.20, or can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application is obtained.

[0185] In this application, neither the zinc-magnesium spinel solid solution (Zn,Mg)Al2O4, the main crystalline phase, nor the tetragonal ZrO2 secondary crystalline phase contains alkali metal ions. Therefore, they do not participate in the ion exchange during the chemical strengthening process. Based on this, the crystal phase structure of the strengthened glass-ceramic obtained through chemical strengthening in this application is essentially the same as that of the glass-ceramic used for chemical strengthening. That is, the crystal phase content, crystal composition, crystal size, and other crystal phase structure characteristics of the strengthened glass-ceramic obtained through chemical strengthening in this application are essentially the same as those of the glass-ceramic used for chemical strengthening in the preparation of this strengthened glass-ceramic. Figure 1 As shown, in Example 1, the XRD patterns of the glass-ceramic before and after chemical strengthening are basically the same. Additionally, as... Figure 2 As shown in this application, the transmittance of the glass ceramic before and after chemical strengthening is basically the same as that of the strengthened glass ceramic. In other words, in this application, by using glass ceramic with high transmittance, a strengthened glass ceramic product with the same excellent transmittance can be obtained through chemical strengthening treatment.

[0186] It should be understood that the stress structure generated by the chemical strengthening process can appropriately improve the mechanical properties of glass products. Therefore, in this application, after the glass ceramic is chemically strengthened to obtain strengthened glass ceramic glass, its mechanical properties such as Young's modulus and Vickers hardness will not decrease.

[0187] In some embodiments of this application, the average crystal size of the strengthened glass ceramic or the glass ceramic used to prepare the strengthened glass ceramic does not exceed 20.0 nm, preferably 1.0 nm to 10.0 nm, more preferably 4.0 nm to 9.0 nm, and even more preferably 4.0 nm to 8.0 nm. A suitable average grain size is beneficial for the glass ceramic to possess both excellent optical properties and high intrinsic strength. However, if the average grain size is too high, the glass ceramic is prone to devitrification, and the chemical strengthening effect will also be affected.

[0188] In some embodiments, the average crystal size of the glass-ceramic or reinforced glass-ceramic can be 4.0 nm, 5.0 nm, 6.0 nm, 7.0 nm, 8.0 nm, 9.0 nm, 10.0 nm, 11 nm, 12 nm, 13 nm, 14 nm, 15 nm, 16 nm, 17 nm, 18 nm, 19 nm, 20 nm, 6.8 nm, 6.4 nm, 6.5 nm, 8.1 nm, 6.1 nm, 5.1 nm, or 6.2 nm, or a value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application is obtained.

[0189] In some embodiments of this application, the total crystalline phase content in the strengthened glass ceramic or the glass ceramic used to prepare the strengthened glass ceramic, by mass percentage, is 25% to 60%, preferably 30% to 55%, and more preferably 40% to 50%. A higher total crystalline phase content in the glass ceramic or strengthened glass ceramic is more conducive to obtaining high intrinsic strength. However, an excessively high total crystalline phase content not only affects the chemical strengthening effect of the glass ceramic, prolonging the chemical strengthening time to obtain strengthened glass ceramics with high stress levels, but may also affect the optical properties of the glass ceramic. In some embodiments, the total content of crystalline phases in the strengthened glass-ceramic or the glass-ceramic used to prepare the strengthened glass-ceramic can be 30.00%, 31.00%, 32.00%, 33.00%, 34.00%, 35.00%, 36.00%, 37.00%, 38.00%, 39.00%, 40.00%, 41.00%, 42.00%, 43.00%, 44.00%, 45.00%, 46.00%, 47.00%, or 48.00%. The percentages are 49.00%, 50.00%, 55.00%, 60.00%, 48.69%, 45.11%, 49.52%, 47.85%, 54.07%, 51.56%, 45.49%, 44.77%, 52.28%, 35.52%, 48.75%, or 44.33%, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application is obtained.

[0190] In this application, "main crystalline phase zinc-aluminum spinel-magnesium-aluminum spinel solid solution" or other similar expressions refer to the fact that the zinc-aluminum spinel-magnesium-aluminum spinel solid solution accounts for more than 50% by mass of all crystalline phases of the glass-ceramic or reinforced glass-ceramic according to the embodiments of this application. In some embodiments, the zinc-aluminum spinel-magnesium-aluminum spinel solid solution accounts for more than 50% by mass of all crystalline phases of the glass-ceramic or the reinforced glass-ceramic made from the glass-ceramic, preferably, the zinc-aluminum spinel-magnesium-aluminum spinel solid solution accounts for more than 70% by mass of all crystalline phases of the glass-ceramic or the reinforced glass-ceramic made from the glass-ceramic. For example, in all crystalline phases of the glass-ceramic or the reinforced glass-ceramic made from the glass-ceramic, the mass percentage (or weight percentage, mass percentage, weight percentage) of the zinc aluminum spinel-magnesium aluminum spinel solid solution phase can be 50%, 60%, 70%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, or 90%, or can be a value within a range defined by any two of the above specific values ​​as endpoints, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramic or reinforced glass-ceramic with the desired performance of this application can be obtained.

[0191] In this application, by ensuring that the glass ceramic or reinforced glass ceramic meets the desired total content / crystallinity of crystalline phases and an appropriate average crystal size, it is beneficial to enable the glass ceramic or reinforced glass ceramic to maintain excellent optical properties while meeting excellent mechanical strength and high intrinsic strength, thereby obtaining the desired chemical strengthening effect.

[0192] In some embodiments of this application, the reinforced glass ceramic or the glass ceramic used to prepare the reinforced glass ceramic is transparent in the visible light wavelength range. Preferably, at a thickness of 0.90 mm, the transmittance of the reinforced glass ceramic or the glass ceramic used to prepare the reinforced glass ceramic for 550 nm wavelength light is ≥85.00%, more preferably ≥87.00%. Glass ceramics or reinforced glass ceramics that meet this transmittance requirement ensure good light transmission and transparency, making them suitable for use in electronic device displays where display quality is crucial. Here, "visible light wavelength range" refers to light with wavelengths from 360 nm to 740 nm.

[0193] In some embodiments, at a thickness of 0.90 mm, the transmittance of the reinforced glass ceramic or the glass ceramic used to prepare the reinforced glass ceramic for 550 nm wavelength light can be: 86.00%, 87.00%, 88.00%, 88.50%, 89.00%, 89.10%, 89.20%, 89.30%, 89.40%, 89.50%, 89.60%, 89.70%, 89.80%, 89.90%, 90.00%, 90.10%, 90.20%, 9 The values ​​can be 0.30%, 90.40%, 90.50%, 91.00%, 92.00%, 89.73%, 89.48%, 89.87%, 89.66%, 89.15%, 89.43%, 89.65%, 89.71%, 89.14%, 89.75%, 89.90%, 89.85%, or 88.53%, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the desired performance of the glass-ceramic or reinforced glass-ceramic is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as the desired performance of the glass-ceramic or reinforced glass-ceramic is obtained.

[0194] In some embodiments of this application, the Vickers hardness of the reinforced glass-ceramic is greater than or equal to 750 kgf / mm². 2 Preferably, the Vickers hardness of the reinforced glass-ceramic is greater than or equal to 790 kgf / mm². 2 The Vickers hardness of reinforced glass ceramics falls within the above range, indicating that reinforced glass ceramics possess high hardness and high intrinsic strength, thereby ensuring excellent mechanical properties.

[0195] In some embodiments, the Vickers hardness of the reinforced glass-ceramic can be 790 kgf / mm². 2 795kgf / mm 2 800kgf / mm 2 805 kgf / mm 2 810kgf / mm 2 815kgf / mm 2 820kgf / mm 2 825kgf / mm 2 830kgf / mm 2 835kgf / mm 2 840kgf / mm 2 845kgf / mm 2 850kgf / mm 2 855kgf / mm 2 860kgf / mm 2865kgf / mm 2 870kgf / mm 2 875kgf / mm 2 880kgf / mm 2 885kgf / mm 2 890kgf / mm 2 895kgf / mm 2 900kgf / mm 2 848kgf / mm 2 879kgf / mm 2 889kgf / mm 2 836kgf / mm 2 911 kgf / mm 2 897kgf / mm 2 807 kgf / mm 2 894 kgf / mm 2 883 kgf / mm 2 873 kgf / mm 2 863 kgf / mm 2 Or 856 kgf / mm 2 Alternatively, the value can be any value within a range defined by any two of the above specific values ​​as endpoints, as long as it yields the reinforced glass-ceramic with the performance required by this application. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as it yields the reinforced glass-ceramic with the performance required by this application.

[0196] In some embodiments of this application, the fracture toughness of the reinforced glass-ceramic is greater than or equal to 1.00 MPa·m. 0.5 Preferably, the fracture toughness value of the reinforced glass-ceramic is greater than or equal to 1.20 MPa·m. 0.5 More preferably, the fracture toughness value of the reinforced glass-ceramic is greater than or equal to 1.50 MPa·m. 0.5 .

[0197] In this application, by giving the reinforced glass ceramic high Vickers hardness and fracture toughness, the reinforced glass ceramic is less likely to break when subjected to compression or impact, which is beneficial to improving the compressive strength of the reinforced glass ceramic.

[0198] In some embodiments, the fracture toughness of the reinforced glass-ceramic can be 1.20 MPa·m. 0.5 1.30 MPa·m 0.5 1.45 MPa·m 0.5 1.50 MPa·m 0.5 1.55 MPa·m 0.51.60 MPa·m 0.5 1.65 MPa·m 0.5 1.70 MPa·m 0.5 1.75 MPa·m 0.5 1.80 MPa·m 0.5 1.85 MPa·m 0.5 1.90 MPa·m 0.5 1.95 MPa·m 0.5 2.00 MPa·m 0.5 1.64 MPa·m 0.5 1.66 MPa·m 0.5 1.71 MPa·m 0.5 1.63 MPa·m 0.5 1.74 MPa·m 0.5 1.72 MPa·m 0.5 1.59 MPa·m 0.5 1.69 MPa·m 0.5 1.57 MPa·m 0.5 Or 1.67 MPa·m 0.5 Alternatively, the value can be any value within a range defined by any two of the above specific values ​​as endpoints, as long as it yields the reinforced glass-ceramic with the performance required by this application. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as it yields the reinforced glass-ceramic with the performance required by this application.

[0199] In some embodiments of this application, the reinforced glass ceramic has a |CT_AV| of no more than 60 MPa, preferably a |CT_AV| of 4.00 MPa to 55.00 MPa, and more preferably a |CT_AV| of 4.00 MPa to 20.00 MPa, where |CT_AV| is the absolute value of the average tensile stress, determined by SLP_2000.

[0200] In some embodiments, the |CT_AV| of the reinforced glass ceramic can be 4.00 MPa, 5.00 MPa, 6.00 MPa, 7.00 MPa, 8.00 MPa, 9.00 MPa, 10.00 MPa, 11.00 MPa, 12.00 MPa, 13.00 MPa, 14.00 MPa, 15.00 MPa, 16.00 MPa, 17.00 MPa, 18.00 MPa, 19.00 MPa, 20.00 MPa, 30.00 MPa, 40.00 MPa, 50.00 MPa, 60.00 MPa, 6 The pressure values ​​can be 0.68 MPa, 5.85 MPa, 12.45 MPa, 5.45 MPa, 7.33 MPa, 7.79 MPa, 10.91 MPa, 14.64 MPa, 9.98 MPa, 6.25 MPa, 13.15 MPa, 8.58 MPa, 6.33 MPa, 7.91 MPa, 10.75 MPa, 12.77 MPa, 13.58 MPa, 9.47 MPa, or 7.98 MPa, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the reinforced glass-ceramic exhibiting the performance required by this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as the reinforced glass-ceramic exhibiting the performance required by this application is obtained.

[0201] In some embodiments of this application, the reinforced glass ceramic has a |CT_CV| of no more than 75 MPa, preferably a |CT_CV| of 5.00 MPa to 70.00 MPa, and more preferably a |CT_CV| of 6.00 MPa to 25.00 MPa, where |CT_CV| is the absolute value of the maximum tensile stress, determined by SLP_2000.

[0202] In some embodiments, the |CT_CV| of the reinforced glass-ceramic is 5.00 MPa, 6.00 MPa, 7.00 MPa, 8.00 MPa, 9.00 MPa, 10.00 MPa, 11.00 MPa, 12.00 MPa, 13.00 MPa, 14.00 MPa, 15.00 MPa, 16.00 MPa, 17.00 MPa, 18.00 MPa, 19.00 MPa, 20.00 MPa, 21.00 MPa, 22.00 MPa, 23.00 MPa, 24.00 MPa, 25.00 MPa, 35.00 MPa, 45.00 MPa, or 55.00 MPa. a) 65.00 MPa, 75.00 MPa, 7.87 MPa, 6.96 MPa, 15.32 MPa, 6.84 MPa, 8.12 MPa, 9.01 MPa, 11.79 MPa, 17.92 MPa, 11.70 MPa, 7.76 MPa, 15.90 MPa, 9.45 MPa, 8.68 MPa, 9.13 MPa, 12.07 MPa, 14.12 MPa, 15.74 MPa, 10.75 MPa, or 9.02 MPa, or any value within a range defined by any two of the above specific values ​​as endpoints, as long as the strengthened glass-ceramic with the desired performance of this application is obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramic with the desired performance of this application is obtained.

[0203] In this application, by making the reinforced glass ceramic meet a suitable stress structure, it is beneficial to give full play to the role of the stress structure in improving mechanical strength performance, especially the improvement of the excellent compressive strength performance to be achieved in this application.

[0204] In some embodiments of this application, a 10mm diameter round-headed metal pressure bar is used to gradually apply a load vertically downwards at a rate of 10mm / min, compressing the center of the main surface of the reinforced glass ceramic. The static compressive strength that the reinforced glass ceramic can withstand is tested, and the static compressive strength that the reinforced glass ceramic can withstand is greater than 800N. In this application, the static compressive strength of the single bar is used to characterize the compressive strength of the reinforced glass ceramic; the greater the static compressive strength that the reinforced glass ceramic can withstand, the better its compressive strength.

[0205] Having introduced the composition, crystal structure, and stress structure of reinforced glass ceramics, the preparation methods of reinforced glass ceramics will now be described in detail.

[0206] In this application, the preparation process of the strengthened glass ceramic mainly includes: the preparation process of the glass ceramic and the chemical strengthening process, and the preparation process of the glass ceramic mainly includes: the preparation process of the substrate glass and the heat treatment process of the substrate glass.

[0207] In this application, the substrate glass can be prepared using existing forming methods, and this application has no limitations on this. For example, the forming method of the substrate glass may include, but is not limited to, float glass, overflow glass, calendering, or casting processes. For instance, by uniformly mixing the components according to the formula, melting and forming the substrate glass, and then cooling and annealing it, the substrate glass can be obtained.

[0208] For example, raw materials (common industrial raw materials) are prepared according to the formula ratio, a clarifying agent is added, and then mixed for a period of time to obtain a uniformly mixed raw material mixture. The raw material mixture is placed in a platinum crucible and heated to 1450℃~1800℃, preferably with a melting temperature of 1550℃~1680℃, and preferably held at this temperature for 3~12 hours. Then, it is poured into a molding die for cooling and shaping, preferably cooled to 800℃~1000℃, and then placed in an annealing furnace for annealing treatment, preferably at an annealing temperature of 500℃~700℃, and preferably for annealing time of 4 hours~48 hours. Afterward, it is cooled to room temperature in the furnace to obtain the substrate glass. Those skilled in the art can select the type and amount of clarifying agent according to their needs without any inventive effort. Furthermore, the clarifying agent may include, but is not limited to, one or more of sodium chloride, tin oxide, antimony oxide, or arsenic oxide, and the amount of clarifying agent added may be 0wt%~1wt% of the total amount of each raw material.

[0209] In some embodiments of this application, the heat treatment process of the substrate glass may include nucleation and / or crystallization, preferably both nucleation and crystallization. In some embodiments, the crystallization process includes a one-step crystallization process or a multi-step crystallization process.

[0210] In some embodiments of this application, in order to obtain the desired physicochemical properties of the glass-ceramic, the heat treatment of the substrate glass can be performed in one step, or in two or more steps. A one-step heat treatment means that nucleation (i.e., nucleation treatment) is not performed separately; instead, the temperature is directly increased in one step, and nucleation and target crystal growth occur at the temperature reached during this one-step heating process. This can be understood as direct crystallization treatment. A two-step heat treatment means that two heating processes are performed: first, nucleation treatment (i.e., nucleation treatment), and then target crystal growth treatment (i.e., crystallization treatment).

[0211] In this application, to induce the precipitation of the desired crystalline phase in the glass-ceramic and obtain the desired physicochemical properties, the nucleation treatment temperature can be 600℃~850℃, and the nucleation treatment time can be 0h~72h, preferably 0h~10h; the crystallization treatment temperature can be 700℃~1000℃, and the crystallization treatment time can be 0.10h~24h, preferably 0.1h~6h. During heat treatment, the heating rate is preferably controlled at 5℃ / min~15℃ / min, more preferably 10℃ / min. Here, the nucleation treatment temperature refers to the temperature at which crystal nuclei can form. The crystallization treatment temperature refers to the temperature at which the target crystal can grow in a controllable manner.

[0212] After heat treatment, those skilled in the art can also perform other conventional steps to obtain glass-ceramic samples / pieces that meet the required specifications or requirements, such as shaping, cutting (e.g., cutting with a multi-wire cutting machine), CNC machining (computer numerical control), thinning, or polishing.

[0213] In some embodiments of this application, reinforced glass ceramics that meet the desired properties can be prepared by subjecting the aforementioned glass ceramics to specific chemical strengthening treatments.

[0214] In this application, the chemical strengthening treatment, namely the ion exchange method, involves immersing the glass ceramic in a molten salt bath, allowing the alkali metal ions with smaller ionic radii in the glass ceramic to exchange with the alkali metal ions with larger ionic radii in the molten salt bath, thereby forming a compressive stress layer on the surface of the glass ceramic and obtaining a strengthened glass ceramic with better mechanical properties.

[0215] In some embodiments of this application, the chemical enhancement treatment can be carried out using a single-step enhancement method or a multi-step enhancement method. The molten salt bath used for chemical enhancement treatment is a molten salt bath containing sodium salt and / or potassium salt. Preferably, in this application, the chemical enhancement adopts a single-step enhancement method, and the molten salt bath used in the enhancement process is a salt bath containing pure potassium salt, or a mixed salt bath in which the mass percentage of potassium salt is not less than 90%. Preferably, the temperature of the molten salt bath is 380℃~600℃, more preferably 400~500℃. In some embodiments of this application, a certain amount (e.g., 0wt%~0.5wt%) of lithium salt can be added to the salt bath. In some embodiments of this application, the chemical enhancement treatment time is preferably 0.1h~48h, more preferably 0.1h~24h. The sodium salt can be selected from at least one of sodium nitrate, sodium sulfate, and sodium carbonate, preferably sodium nitrate; the potassium salt can be selected from at least one of potassium nitrate, potassium sulfate, and potassium carbonate, preferably potassium nitrate; the lithium salt can be selected from at least one of lithium nitrate, lithium sulfate, and lithium carbonate, preferably lithium nitrate.

[0216] In some embodiments of this application, the reinforced glass-ceramic may be made of materials with a fracture toughness of not less than 1.40 MPa·m. 0.5 The glass-ceramic is prepared by chemical strengthening treatment. Preferably, the strengthened glass-ceramic can be made of materials with a fracture toughness of not less than 1.40 MPa·m. 0.5 The glass-ceramic is prepared by a single-step chemical strengthening treatment. More preferably, the fracture toughness can be not less than 1.40 MPa·m. 0.5 Glass ceramics are placed in a molten salt bath containing potassium salts at a mass percentage greater than or equal to 90% for a single-step chemical strengthening treatment to obtain the strengthened glass ceramics with a specific surface composition and excellent extrusion resistance.

[0217] The glass-ceramics or reinforced glass-ceramics with excellent properties (especially excellent compressive strength) provided in this application can be used in electronic devices, including but not limited to mobile phones, tablets, handheld game consoles, portable digital devices (e.g., digital cameras), vehicle central control systems, electronic whiteboard glass, smart home devices, and smart wearables (e.g., smart bracelets, smartwatches, smart glasses). They can also be used in vehicles, aircraft, or spacecraft, and in any glass components made of glass-ceramics or reinforced glass-ceramics as desired. For example, they can be used for displays, cover glass, touchscreens, inner glass screens, or inner frames of electronic devices; for example, they can be used for windshields of vehicles, aircraft, or spacecraft, such as front windshields or side windshields. For example, they can be used for worktops, other surfaces, appliance doors, floor tiles, wall panels, or storage containers. Other surfaces can include, but are not limited to, exterior wall surfaces, stair tread surfaces, column cladding, or countertop surfaces; storage containers can include, but are not limited to, cups, plates, medicine bottles, or beverage bottles.

[0218] For example, the glass-ceramic or reinforced glass-ceramic with excellent properties provided in this application can be used to manufacture glass devices. The glass devices referred to herein can be regular or irregular, and can be manufactured by those skilled in the art according to their needs.

[0219] For example, the glass-ceramic or reinforced glass-ceramic with excellent properties (especially excellent compressive strength) provided in this application can be used to manufacture cover glass, which can be a display screen cover, back cover, or camera protective cover for electronic devices. For example, the glass-ceramic or reinforced glass-ceramic with excellent properties provided in this application can be used in electronic devices. Reference Figure 7 , Figure 8 , Figure 9 and Figure 10 In some embodiments of this application, an electronic device is provided, which may be a mobile phone (e.g., Figure 7 ), tablet computers, smart wearable devices (such as Figure 10Electronic products such as display modules 4 include an outer casing 1 assembled on the outside of the electronic device. The casing 1 includes a display cover 11 assembled on the front and a rear cover 12 assembled on the rear. The display cover 11 covers the display module 4. The display cover 11 and / or the rear cover 12 are made of the aforementioned glass-ceramic or reinforced glass-ceramic. In this application, the display cover 11 and the rear cover 12 may be entirely made of the aforementioned glass-ceramic or reinforced glass-ceramic, or only partially made of the aforementioned glass-ceramic or reinforced glass-ceramic. In this application, the display screen may be a touch screen, and the display cover 11 may be a protective cover disposed on the touch screen. In this application, the rear cover 12 may only cover the rear side of the electronic device (and the side away from the display screen), or it may cover both the rear side and the side frame of the electronic device. Optionally, the rear cover 12 may cover all the side frames around the electronic device, or it may cover only part of the side frames.

[0220] In some embodiments of this application, such as Figure 8 As shown, the electronic device may further include a camera assembly 2 located inside the housing 1. The housing 1 may include a camera protective cover 13, which covers the camera assembly 2 to protect it. The camera protective cover 13 is made of the aforementioned glass-ceramic or reinforced glass-ceramic. In this application, the camera protective cover 13 may be partially or entirely made of the aforementioned glass-ceramic or reinforced glass-ceramic. In this application, the location of the camera protective cover 13 depends on the location of the camera assembly 2; it may be located on the front side of the electronic device or on the rear side of the electronic device. In some embodiments of this application, the camera protective cover 13 may be a separate structure from the display screen cover 11 or the rear cover 12. In other embodiments of this application, the camera protective cover 13 may be an integral structure with the display screen cover 11 or the rear cover 12.

[0221] In some embodiments of this application, such as Figure 9 As shown, the electronic device may also include a mid-frame 3 located between the display module 4 and the housing 1, and the mid-frame 3 may include the aforementioned glass ceramic or reinforced glass ceramic.

[0222] In the embodiments of this application, the display screen cover, back cover, camera protective cover, and mid-frame in the electronic device can be any one, any two, any three, or all four of them, and are made of the aforementioned glass ceramic or reinforced glass ceramic.

[0223] In some embodiments of this application, the display screen cover, back cover, camera protective cover, or mid-frame in the electronic device can be 2D, 2.5D, 3D, or irregularly shaped. In some embodiments of this application, the display screen cover, back cover, camera protective cover, or mid-frame in the electronic device can be of uniform thickness or unequal thickness.

[0224] The technical solutions of this application will be further described in detail below with reference to the embodiments. The embodiments of this application described in detail below are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0225] Example 1

[0226] A reinforced glass-ceramic, the preparation process of which is as follows:

[0227] (1) Preparation of substrate glass:

[0228] Prepare each raw material (conventional industrial raw material) according to the proportions of each component in Table 1. The total mass of the prepared raw materials is 1000g. Add 5g of clarifying agent sodium chloride (NaCl) to the prepared raw materials, and then mix with a V-type mixer for 30 minutes to obtain a uniformly mixed raw material mixture.

[0229] The raw material mixture is transferred to a platinum crucible and melted in the platinum crucible at 1650°C for 5 hours. Then it is poured into a molding mold to cool and is cooled to 900°C. It is then placed in an annealing furnace at 600°C for 24 hours and then cooled to room temperature in the furnace to obtain the base glass brick.

[0230] (2) Preparation of glass ceramics: According to the heat treatment process in Table 2, the substrate glass brick was placed in an annealing furnace and heated from room temperature to 750℃ at a rate of 10℃ / min for nucleation treatment. After holding at this temperature for 240 min, the temperature was increased to 765℃ at a rate of 10℃ / min for crystallization treatment. After holding at this temperature for 120 min, the temperature was lowered to room temperature at a rate of 1℃ / min to obtain the glass ceramic sample brick. The composition of the prepared glass ceramic, based on the mass percentage of oxides, is the same as that of the substrate glass, as detailed in Table 1.

[0231] After the obtained glass-ceramic sample bricks are sequentially cut, CNC machined (the CNC instrument used in this application is model RCG500S), and polished, glass-ceramic samples / pieces that meet the required specifications and requirements can be obtained. In Examples 1-20 and Comparative Examples 1-15 of this application, the glass-ceramic sample bricks are subjected to the aforementioned cold working treatment to produce glass-ceramic samples / pieces with thicknesses of 0.70 mm, 0.90 mm, 0.95 mm, or 1.05 mm, respectively. Specifically, circular glass-ceramic polished sheet samples / pieces with a diameter of 46 mm and thicknesses of 0.70 mm, 0.90 mm, 0.95 mm, or 1.05 mm are produced.

[0232] The following tests were conducted on the glass-ceramic samples / pieces obtained in Example 1:

[0233] The crystal phase composition, average crystal size, total crystal phase content, transmittance (under 550 nm wavelength light), density, Vickers hardness and fracture toughness of the glass ceramics were tested respectively, and the results are shown in Table 2.

[0234] (3) Preparation of reinforced glass ceramics: According to the chemical strengthening process in Table 3, the obtained glass ceramic sample / piece is placed in the strengthening furnace cavity and preheated for 5 minutes. After preheating, it is quickly placed in a molten salt bath at 430°C for chemical strengthening treatment. The composition of the molten salt is 100wt% KNO3, and the chemical strengthening treatment time is 1 hour. After that, the glass ceramic sample / piece is taken out and placed on the furnace body of the strengthening furnace to be slowly cooled to room temperature. The salt coating on the surface of the glass ceramic is washed off with clean water. After drying the glass ceramic sample / piece, the reinforced glass ceramic can be obtained.

[0235] The following tests were conducted on the reinforced glass-ceramic samples / pieces obtained in Example 1:

[0236] I. The reinforced glass ceramics were tested under an SLP-2000 stress meter (the light source wavelength was 518nm, SOC = 25.5 (nm / cm) / MPa, the refractive index was set to 1.60, and the exposure time was 300μsec) to measure |CT_CV| and |CT_AV|. The results are shown in Table 3.

[0237] II. The surface Na2O and K2O mass percentages of the reinforced glass ceramics were determined by XRF, and the results are shown in Table 3.

[0238] III. The reinforced glass ceramic was subjected to micro-area composition analysis using the characteristic X-rays generated after the sample was treated with an electron beam on a Shimadzu EPMA-1720HT electron probe. The DOL_K was measured, and the results are shown in Table 3.

[0239] IV. The Vickers hardness and fracture toughness of the reinforced glass ceramics, as well as the static compressive strength of the reinforced glass ceramics that can withstand, were tested. The results are shown in Table 3.

[0240] Examples 2 to 19

[0241] Each of these experiments was conducted with reference to Example 1, except that the raw material composition, different process parameters, and corresponding test results for each example are shown in Tables 1 to 3.

[0242] Among them, the XRD patterns of the glass ceramic and the reinforced glass ceramic in Example 1 are compared, as shown in the figure. Figure 1 As shown in the figure, ① the main crystalline phase of both glass ceramics and reinforced glass ceramics is zinc aluminum spinel-magnesium aluminum spinel solid solution (Zn,Mg)Al2O4, and the secondary crystalline phase is ZrO2; ② the XRD patterns of glass ceramics and reinforced glass ceramics are basically overlapping, indicating that the crystal structure remains essentially unchanged before and after chemical strengthening.

[0243] A comparison of the transmittance curves of glass-ceramic and reinforced glass-ceramic in Example 1 is shown below. Figure 2 As shown in the figure, both the glass ceramic and the reinforced glass ceramic prepared therefrom are transparent in the visible light range and have high transmittance. Moreover, the transmittance remains basically unchanged before and after chemical strengthening.

[0244] Comparative Examples 1 to 15

[0245] The experiments were conducted in accordance with Example 1, with the difference being that the raw material composition, different process parameters, and corresponding test results of each comparative example are shown in Tables 1-3.

[0246]

[0247]

[0248]

[0249]

[0250]

[0251] Note: 1. In Table 3, the surface K2O concentration refers to the mass percentage of surface K2O in the reinforced glass ceramic, and the surface Na2O concentration refers to the mass percentage of surface Na2O in the reinforced glass ceramic.

[0252] 2. In Table 3, if the data in the "Surface K₂O Concentration" or "Surface Na₂O Concentration" column is recorded as "0.000", it indicates that the K or Na content in the strengthened glass ceramic of the tested scheme is less than 0.0013%, which is lower than the testing accuracy (0.0013%) of the XRF instrument used in this application. Since the instrument will not display the element and its content when the content is lower than the testing accuracy of the XRF instrument, "0.000" is used to record it in this application.

[0253] 3. In Table 3, if the "salt bath composition" column of each embodiment or comparative example does not explicitly state "first step strengthening" or "second step strengthening", it indicates that the embodiment or comparative example uses single-step strengthening, that is, only one step of chemical strengthening treatment was performed.

[0254] 4. In Table 3, the column “Salt Bath Composition” clearly states “First Step Strengthening” and “Second Step Strengthening”, indicating that the comparative example underwent two-step chemical strengthening treatment. After each strengthening treatment, |CT-CV| and |CT-AV| tests were performed. After the second strengthening treatment, the surface K2O concentration, surface Na2O concentration, DOL_K, Vickers hardness and fracture toughness of the obtained strengthened glass ceramic were tested, as well as the single bar static compressive strength that the strengthened glass ceramic could withstand was tested.

[0255] As can be seen from the embodiments and comparative examples in Tables 1-3 above, each embodiment of this application uses glass-ceramics that meet specific composition and specific crystal phase structure and have a thickness greater than 0.70 mm for chemical strengthening, and makes the surface composition of the obtained strengthened glass-ceramics meet specific requirements, especially the surface Na2O mass percentage (i.e., surface Na2O concentration in Table 3) and surface K2O mass percentage (i.e., surface K2O concentration in Table 3) of the strengthened glass-ceramics, as well as the K2O concentration calculated from the main surface of the strengthened glass-ceramics. + The diffusion depth of (K element) (i.e., DOL_K in Table 3) simultaneously meets specific requirements, significantly improving the compressive strength of reinforced glass ceramics, giving them excellent compressive strength and enabling them to withstand a single bar static compressive strength greater than 800N.

[0256] In the schemes of Comparative Examples 1 to 15, the composition, thickness, or surface composition of the glass ceramic used to prepare the reinforced glass ceramic did not meet the specific requirements of this application, which ultimately resulted in the reinforced glass ceramic having significantly lower compressive strength than the embodiments that meet the requirements of this application.

[0257] The following is an example analysis of some comparative proportions:

[0258] The substrate glass in Comparative Example 1 does not contain Li₂O, thus failing to meet the compositional requirements for the center of the strengthened glass-ceramic in this application. The Vickers hardness of the glass-ceramic obtained after heat treatment is 650 kgf / mm². 2 The fracture toughness value is 1.32 MPa·m. 0.5 After chemical strengthening treatment, the resulting reinforced glass-ceramic exhibited a DOL_K of 16.80 μm and a surface K₂O concentration of 6.33%, but a surface Na₂O concentration of only 1.450%, failing to meet the surface composition requirements of this application. Ultimately, testing revealed a Vickers hardness of 774 kgf / mm². 2 The fracture toughness is 1.53 MPa·m. 0.5 The static compressive strength that this reinforced glass-ceramic can withstand on a single rod is only 599N, which is significantly lower than that of the embodiment in this application.

[0259] The Na₂O content in the substrate glass of Comparative Example 2 was 0.87%, which is too low and does not meet the composition requirements for the center of the strengthened glass-ceramic in this application. The Vickers hardness of the glass-ceramic obtained after heat treatment was 721 kgf / mm². 2 The fracture toughness value is 1.47 MPa·m. 1 / 2 The chemically strengthened glass-ceramic produced had a surface K₂O concentration of 1.58%, a surface Na₂O concentration of 0.000%, and a DOL₂K concentration of 4.00 μm, which does not meet the requirements of this application for the surface composition of strengthened glass-ceramics. Finally, the Vickers hardness of the strengthened glass-ceramic was tested to be 759 kgf / mm². 2 The fracture toughness is 1.53 MPa·m. 0.5 The single-bar static compressive strength that this reinforced glass ceramic can withstand is only 558N, which is significantly lower than that of the embodiment in this application.

[0260] The Li₂O concentration in the substrate glass of Comparative Example 3 was 0.62%, which is too low and does not meet the composition requirements for the center of the strengthened glass-ceramic in this application. The Vickers hardness of the glass-ceramic obtained after heat treatment was 657 kgf / mm². 2 The fracture toughness value is 1.36 MPa·m. 0.5 After chemical strengthening treatment, the resulting reinforced glass-ceramic exhibited a surface K₂O concentration of 3.92%, a surface Na₂O concentration of 0.000%, and a DOL₂K concentration of 9.40 μm. Finally, the Vickers hardness of this reinforced glass-ceramic was measured to be 766 kgf / mm². 2 The fracture toughness is 1.53 MPa·m. 0.5 The static compressive strength that this reinforced glass ceramic can withstand is only 661N, which is significantly lower than that of the embodiment in this application.

[0261] The Li₂O concentration in the substrate glass of Comparative Example 4 was 0.79%, which is too low and does not meet the composition requirements for the center of the strengthened glass-ceramic in this application. The Vickers hardness of the glass-ceramic obtained after heat treatment was 670 kgf / mm². 2 The fracture toughness value is 1.38 MPa·m. 0.5 After chemical strengthening treatment, the resulting reinforced glass-ceramic had a surface K₂O concentration of 5.12% and a surface Na₂O concentration of 2.350%, which does not meet the requirements of this application for the surface composition of reinforced glass-ceramics; the DOL_K value was 9.30 μm. Finally, the Vickers hardness of this reinforced glass-ceramic was tested to be 774 kgf / mm². 2 The fracture toughness is 1.54 MPa·m. 0.5 The single-bar static compressive strength that this reinforced glass ceramic can withstand is only 711N, which is significantly lower than that of the embodiment in this application.

[0262] Comparative Examples 5 to 11 were obtained using the glass-ceramic of Example 1 under different strengthening conditions. However, the surface composition of the strengthened glass-ceramics obtained in Comparative Examples 5 to 11, especially the surface Na2O concentration, surface K2O concentration, and K2O concentration, differed. + The diffusion depth DOL_K of (K element) could not simultaneously meet the requirements of this application for reinforced glass ceramics. Finally, after testing, the single-bar static compressive strength that the reinforced glass ceramics prepared in Comparative Examples 5 to 11 could withstand was all less than 800N.

[0263] Comparative Example 12 uses the glass-ceramic from Example 11 obtained under different strengthening conditions. The surface Na₂O concentration, surface K₂O concentration, and K₂O concentration of the strengthened glass-ceramic prepared in Comparative Example 12 are shown. + The diffusion depth (DOL_K) of the K element also fails to meet the requirements of this application for reinforced glass ceramics. Ultimately, after testing, the reinforced glass ceramic prepared in Comparative Example 12 can withstand a single bar static compressive strength of 790N, which is lower than 800N.

[0264] The glass-ceramics of Comparative Examples 13 to 15 had the same composition as those of the glass-ceramics of Example 1, but used a different thickness. Although the surface composition of the reinforced glass-ceramics obtained in Comparative Examples 13 and 15 met the requirements of this application for reinforced glass-ceramics, the single-bar static compressive strength that the reinforced glass-ceramics obtained in Comparative Examples 13 to 15 could withstand was all less than 800 N after testing. It can be seen that thickness has a positive effect on improving the compressive strength of reinforced glass-ceramics.

[0265] The above description is merely a specific embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A reinforced glass-ceramic, characterized in that, The thickness t of the reinforced glass ceramic is greater than 0.7 mm; The reinforced glass-ceramic comprises a primary crystalline phase of zinc aluminum spinel-magnesium aluminum spinel solid solution and a secondary crystalline phase of zirconium oxide. The reinforced glass-ceramic has a compressive stress layer on its surface and tensile stress inside; Based on the mass percentage of oxides, the composition of the center or tensile stress layer of the reinforced glass ceramic includes: SiO2: 25.00%~55.00%, Al2O3: 30.00%~55.00%, ZrO2: 3.00%~8.00%, MgO: 2.00%~5.00%, ZnO: 5.00%~15.00%, Na2O: 1.00%~10.00%, K2O: 0%~5.00%, Li2O: 1.00%~6.00%, CaO: 0%~6.00%, B2O3: 0%~10.00%, BaO: 0%~10.00%, Y2O3: 0%~6.00%, La2O3: 0%~12.00%; and the mass percentage of Li2O is greater than 1.00%, and the mass percentage of Na2O is greater than 1.00%. The surface K2O of the reinforced glass ceramic is 2.00% to 7.50% by mass percentage of oxides. The surface Na2O percentage of the reinforced glass ceramic, calculated by mass percentage of oxides, is less than or equal to 0.010%. The strengthened glass-ceramic satisfies the following condition: 5.00 μm ≤ DOL_K ≤ 20.00 μm, where DOL_K is K measured from the main surface of the strengthened glass-ceramic. + Diffusion depth; the reinforced glass ceramic has a |CT_AV| not exceeding 60 MPa, where |CT_AV| is the absolute value of the average tensile stress.

2. The reinforced glass-ceramic according to claim 1, characterized in that, The thickness t of the reinforced glass ceramic is not less than 0.8 mm; and / or, Based on the mass percentage of oxides, in the composition of the center of the reinforced glass-ceramic or the tensile stress layer, the mass percentage of Li₂O is greater than 1.30%, and the mass percentage of Na₂O is greater than 2.00%; and / or, The surface K₂O of the reinforced glass-ceramic has a mass percentage of 2.50% to 6.50% based on the mass percentage of oxides; and / or, The surface Na₂O of the reinforced glass-ceramic has a mass percentage of less than or equal to 0.005% based on the mass percentage of oxides; and / or, The strengthened glass-ceramic satisfies the following condition: 5.50 μm ≤ DOL_K ≤ 18.00 μm, where DOL_K is K measured from the main surface of the strengthened glass-ceramic. + Diffusion depth.

3. The reinforced glass ceramic according to claim 2, characterized in that, The thickness t of the reinforced glass ceramic is not less than 0.9 mm; and / or, Based on the mass percentage of oxides, in the composition of the center of the reinforced glass-ceramic or the tensile stress layer, the mass percentage of Li₂O is greater than or equal to 1.50%, and the mass percentage of Na₂O is greater than 2.70%; and / or, The surface K₂O of the reinforced glass-ceramic has a mass percentage of 3.00% to 6.00% based on the mass percentage of oxides; and / or, The surface Na2O percentage of the reinforced glass ceramic is less than or equal to 0.002% by mass percentage of oxides. The strengthened glass-ceramic satisfies the following condition: 6.00 μm ≤ DOL_K ≤ 16.00 μm, where DOL_K is K measured from the main surface of the strengthened glass-ceramic. + Diffusion depth.

4. The reinforced glass-ceramic according to claim 1, characterized in that, The reinforced glass-ceramic satisfies the following condition: along the thickness direction of the reinforced glass-ceramic, K + The concentration decreases non-linearly from the main surface of the reinforced glass ceramic towards its center.

5. The reinforced glass-ceramic according to claim 1, characterized in that, The thickness t of the reinforced glass ceramic is 0.85mm~2.00mm; and / or, The reinforced glass-ceramic is 2D, 2.5D, 3D, or irregularly shaped; and / or, The reinforced glass ceramic may be of uniform or unequal thickness.

6. The reinforced glass-ceramic according to claim 5, characterized in that, The thickness t of the reinforced glass ceramic is 0.90mm~1.50mm.

7. The reinforced glass-ceramic according to claim 4, characterized in that, The thickness t of the reinforced glass ceramic is 0.85mm~2.00mm; and / or, The reinforced glass-ceramic is 2D, 2.5D, 3D, or irregularly shaped; and / or, The reinforced glass ceramic may be of uniform or unequal thickness.

8. The reinforced glass-ceramic according to claim 1, characterized in that, The composition of the center or tensile stress layer of the reinforced glass-ceramic, based on the mass percentage of oxides, comprises: The mass percentage of SiO2 is 30.00%~42.00%; and / or, The mass percentage of Al2O3 is 32.00%~42.00%; and / or, The mass percentage of ZrO2 is 4.00%~7.00%; and / or, The mass percentage of MgO is 2.50%~4.00%; and / or, The ZnO mass percentage is 9.00%~13.00%; and / or, The mass percentage of Na2O is 1.00%~8.00%; and / or, The mass percentage of K2O is 0%~3.00%; and / or, The mass percentage of Li2O is 1.00%~4.00%; and / or, The mass percentage of CaO is 0%~3.00%; and / or, The mass percentage of B2O3 is 0%~8.00%; and / or, The mass percentage of BaO is 0%~7.00%; and / or, The mass percentage of Y2O3 is 0%~4.00%; and / or, The mass percentage of La2O3 is 0%~5.00%.

9. The reinforced glass-ceramic according to claim 8, characterized in that, The composition of the center or tensile stress layer of the reinforced glass-ceramic, based on the mass percentage of oxides, comprises: The mass percentage of SiO2 is 35.00%~40.00%; and / or, The mass percentage of Al2O3 is 34.00%~42.00%; and / or, The ZrO2 mass percentage is 5.00%~6.00%; and / or, The mass percentage of MgO is 2.50%~3.50%; and / or, The ZnO mass percentage is 9.00%~11.00%; and / or, The mass percentage of Na2O is 2.00%~6.00%; and / or, The mass percentage of K2O is 0%~1.00%; and / or, The mass percentage of Li2O is 2.00%~3.00%; and / or, The mass percentage of CaO is 0%~1.50%; and / or, The mass percentage of B2O3 is 0%~4.00%; and / or, The mass percentage of BaO is 0%~4.00%; and / or, The mass percentage of Y2O3 is 0%~2.00%; and / or, The mass percentage of La2O3 is 0%~3.00%.

10. The reinforced glass-ceramic according to any one of claims 1 to 6, characterized in that, Based on the mass percentage of oxides, the mass percentages of Na₂O [Na₂O] and Li₂O [Li₂O] in the center or tensile stress layer of the reinforced glass-ceramic satisfy the following relationship: [Na₂O] / [Li₂O] = 0.60~6.00; and / or In the center of the reinforced glass ceramic or in the composition of the tensile stress layer, the mass percentage of Li2O [Li2O] and the mass percentage of SiO2 [SiO2] satisfy the following relationship: [Li2O] / [SiO2] = 0.03~0.

20.

11. The reinforced glass-ceramic according to claim 10, characterized in that, Based on the mass percentage of oxides, the mass percentages of Na₂O [Na₂O] and Li₂O [Li₂O] in the center or tensile stress layer of the reinforced glass-ceramic satisfy the following relationship: [Na₂O] / [Li₂O] = 0.90~5.00; and / or In the center of the reinforced glass ceramic or in the composition of the tensile stress layer, the mass percentage of Li2O [Li2O] and the mass percentage of SiO2 [SiO2] satisfy the following relationship: [Li2O] / [SiO2]=0.04~0.

15.

12. The reinforced glass-ceramic according to claim 10, characterized in that, Based on the mass percentage of oxides, the mass percentages of Na₂O [Na₂O] and Li₂O [Li₂O] in the center or tensile stress layer of the reinforced glass-ceramic satisfy the following relationship: [Na₂O] / [Li₂O] = 1.00~3.00; and / or In the center of the reinforced glass ceramic or in the composition of the tensile stress layer, the mass percentage of Li2O [Li2O] and the mass percentage of SiO2 [SiO2] satisfy the following relationship: [Li2O] / [SiO2]=0.04~0.

10.

13. The reinforced glass ceramic according to any one of claims 1 to 6, characterized in that, In the reinforced glass-ceramic, the average crystal size does not exceed 20 nm; and / or The total content of crystalline phase in the reinforced glass-ceramic is 25% to 60% by mass percentage.

14. The reinforced glass-ceramic according to claim 13, characterized in that, In the strengthened glass-ceramic, the average crystal size is 1.0 nm to 10.0 nm; and / or The total content of crystalline phase in the reinforced glass-ceramic is 30% to 55% by mass percentage.

15. The reinforced glass-ceramic according to claim 14, characterized in that, In the strengthened glass-ceramic, the average crystal size is 4.0 nm to 9.0 nm; and / or The total content of crystalline phase in the reinforced glass ceramic is 40% to 50% by mass percentage.

16. The reinforced glass-ceramic according to claim 15, characterized in that, The average crystal size in the reinforced glass ceramic is 4.0 nm to 8.0 nm.

17. The reinforced glass-ceramic according to any one of claims 1 to 6, characterized in that, The reinforced glass ceramic is transparent in the visible light wavelength range.

18. The reinforced glass-ceramic according to claim 17, characterized in that, At a thickness of 0.90 mm, the transmittance of the reinforced glass ceramic for 550 nm wavelength light is ≥85.00%.

19. The reinforced glass-ceramic according to claim 18, characterized in that, At a thickness of 0.90 mm, the transmittance of the reinforced glass ceramic for 550 nm wavelength light is ≥87.00%.

20. The reinforced glass ceramic according to any one of claims 1 to 6, characterized in that, The Vickers hardness of the reinforced glass-ceramic is greater than or equal to 750 kgf / mm². 2 ; and / or, The fracture toughness of the reinforced glass-ceramic is greater than or equal to 1.00 MPa·m. 0.5 ; and / or, The reinforced glass ceramic has a |CT_CV| not exceeding 75 MPa, where |CT_CV| is the absolute value of the maximum tensile stress.

21. The reinforced glass-ceramic according to claim 20, characterized in that, The Vickers hardness of the reinforced glass ceramic is greater than or equal to 790 kgf / mm². 2 ; and / or, The fracture toughness of the reinforced glass-ceramic is greater than or equal to 1.20 MPa·m. 0.5 ; and / or, The reinforced glass-ceramic has a |CT_AV| of 4.00 MPa to 55.00 MPa, where |CT_AV| is the absolute value of the average tensile stress; and / or, The reinforced glass-ceramic has a |CT_CV| of 5.00 MPa to 70.00 MPa, where |CT_CV| is the absolute value of the maximum tensile stress.

22. The reinforced glass-ceramic according to claim 21, characterized in that, The fracture toughness of the reinforced glass-ceramic is greater than or equal to 1.50 MPa·m. 0.5 ; and / or, The reinforced glass-ceramic has a |CT_AV| of 4.00 MPa to 20.00 MPa, where |CT_AV| is the absolute value of the average tensile stress; and / or, The reinforced glass-ceramic has a |CT_CV| of 6.00 MPa to 25.00 MPa, where |CT_CV| is the absolute value of the maximum tensile stress.

23. The reinforced glass-ceramic according to claim 1, characterized in that, The surface K2O mass percentage of the reinforced glass ceramic is 3.91%, 4.16%, 3.96%, 4.12%, 4.53%, 3.24%, 4.55%, 4.51%, 4.68%, 5.75%, 3.85%, 4.48%, 5.69%, 5.45%, 5.57%, or 5.54%; and / or, The DOL_K of the reinforced glass ceramic is 7.70 μm, 9.60 μm, 10.30 μm, 8.40 μm, 10.40 μm, 8.60 μm, 14.10 μm, 12.50 μm, 6.20μm, 9.80μm, 12.80μm, 9.10μm, 8.30μm, 8.80μm, 11.40μm, 10.60μm, 11.80μm or 11.70μm.

24. The reinforced glass-ceramic according to claim 1, characterized in that, The composition of the center or tensile stress layer of the reinforced glass-ceramic, based on the mass percentage of oxides, comprises: The mass percentages of SiO2 are 37.08%, 36.87%, 33.23%, 37.43%, 37.40%, 38.33%, 36.05%, 35.67%, 32.39%, 37.50%, 35.64%, 37.32%, or 36.31%; and / or, The mass percentages of Al2O3 are 35.83%, 36.98%, 36.27%, 37.52%, 36.60%, 37.07%, 34.84%, 34.55%, 35.88%, 38.63%, 36.23%, or 35.10%; and / or, The mass percentage of ZrO2 is 5.69%, 5.65%, 5.61%, 5.74%, 5.81%, 5.89%, 5.54%, 5.48%, 5.76%, 5.72%, 5.99%, or 5.58%; and / or, The mass percentage of MgO is 3.00%, 2.98%, 3.04%, 3.03%, 3.06%, 3.10%, 2.92%, 2.89%, 3.01%, 3.27%, or 2.94%; and / or, The ZnO mass percentage is 10.77%, 10.71%, 10.55%, 10.87%, 11.01%, 11.15%, 10.46%, 10.37%, 12.50%, 10.82%, 11.33%, or 10.54%; and / or, The mass percentage of Na₂O is 2.86%, 2.85%, 2.89%, 3.00%, 1.69%, 2.79%, 2.76%, 3.31%, 4.61%, 3.01%, or 8.00%; and / or, The mass percentage of K2O is 0; and / or, The mass percentages of Li₂O are 2.35%, 1.55%, 1.50%, 1.77%, 1.60%, 1.62%, 2.28%, 2.27%, 2.24%, 1.60%, 1.57%, 2.85%, or 1.53%; and / or, The mass percentage of CaO is 0%, 0.75%, 1.15%, or 0.92%; and / or, The mass percentage of B2O3 is 0% or 7.07%; and / or, The mass percentage of BaO is 2.42%, 2.41%, 6.94%, 0%, 2.35%, or 2.32%; and / or, The mass percentage of Y2O3 is 0%, 1.52%, or 0.60%; and / or, The mass percentages of La2O3 are 0%, 2.17%, or 3.69%.

25. The reinforced glass-ceramic according to claim 13, characterized in that, In the reinforced glass-ceramic, the average crystal size is 5.0 nm, 6.8 nm, 6.4 nm, 6.5 nm, 8.1 nm, 7.0 nm, 6.1 nm, 5.1 nm, or 6.2 nm; and / or The total content of the crystalline phase in the reinforced glass ceramic, by mass percentage, is 48.69%, 45.11%, 49.52%, 47.85%, 54.07%, 51.56%, 45.49%, 44.77%, 52.28%, 35.52%, 48.75%, or 44.33%.

26. The reinforced glass-ceramic according to claim 20, characterized in that, The Vickers hardness of the reinforced glass-ceramic is 840 kgf / mm². 2 848kgf / mm 2 855kgf / mm 2 879kgf / mm 2 889kgf / mm 2 836kgf / mm 2 911 kgf / mm 2 897kgf / mm 2 807 kgf / mm 2 894 kgf / mm 2 883 kgf / mm 2 873 kgf / mm 2 795kgf / mm 2 863 kgf / mm 2 850kgf / mm 2 856 kgf / mm 2 Or 860 kgf / mm 2 ; and / or, The fracture toughness of the reinforced glass-ceramic is 1.64 MPa·m. 0.5 1.65 MPa·m 0.5 1.66 MPa·m 0.5 1.70 MPa·m 0.5 1.71 MPa·m 0.5 1.63 MPa·m 0.5 1.74 MPa·m 0.5 1.72 MPa·m 0.5 1.59 MPa·m 0.5 1.69 MPa·m 0.5 1.57 MPa·m 0.5 Or 1.67 MPa·m 0.5 ; and / or, The |CT_AV| of the strengthened glass ceramic is 6.68 MPa, 5.85 MPa, 12.45 MPa, 5.45 MPa, 7.33 MPa, 7.79 MPa, 10.91 MPa, 14.64 MPa, 9.98 MPa, 6.25 MPa, 13.15 MPa, 8.58 MPa, 6.33 MPa, 7.91 MPa, 10.75 MPa, 12.77 MPa, 13.58 MPa, 9.47 MPa, or 7.98 MPa; and / or, The |CT_CV| of the strengthened glass ceramic is 7.87MPa, 6.96MPa, 15.32MPa, 6.84MPa, 8.12MPa, 9.01MPa, 11.79MPa, 17.92MPa, 11.70MPa, 7.76MPa, 15.90MPa, 9.45MPa, 8.68MPa, 9.13MPa, 12.07MPa, 14.12MPa, 15.74MPa, 10.75MPa, or 9.02MPa.

27. The reinforced glass-ceramic according to any one of claims 1 to 6, characterized in that, A 10mm diameter round-headed metal pressure bar is used to apply a load vertically downwards at a rate of 10mm / min, pressing the center of the main surface of the reinforced glass ceramic. The static compressive strength of a single bar that the reinforced glass ceramic can withstand is tested. The static compressive strength of a single bar that the reinforced glass ceramic can withstand is greater than 800N.

28. The reinforced glass-ceramic according to any one of claims 1 to 6, characterized in that, The reinforced glass-ceramic has a fracture toughness of not less than 1.40 MPa·m. 0.5 Glass ceramics are produced through chemical strengthening treatment.

29. The reinforced glass-ceramic according to claim 28, characterized in that, The reinforced glass-ceramic has a fracture toughness of not less than 1.40 MPa·m. 0.5 The glass-ceramic is prepared by a single-step chemical strengthening process.

30. The reinforced glass-ceramic according to claim 29, characterized in that, The fracture toughness shall not be less than 1.40 MPa·m 0.5 The glass-ceramic is placed in a molten salt bath containing potassium salt with a mass percentage of greater than or equal to 90% to undergo a single-step chemical strengthening treatment to obtain the strengthened glass-ceramic.

31. A cover glass, characterized in that, The cover glass is made of reinforced glass ceramic as described in any one of claims 1-30.

32. An electronic device, characterized in that, The electronic device comprises reinforced glass ceramic as described in any one of claims 1-30.

33. The electronic device according to claim 32, characterized in that, The electronic device includes a housing, the housing comprising reinforced glass-ceramic as claimed in any one of claims 1-30.

34. The electronic device according to claim 33, characterized in that, The housing includes a display cover, which comprises reinforced glass-ceramic as claimed in any one of claims 1-30.

35. The electronic device according to claim 33, characterized in that, The housing includes a back cover, which comprises reinforced glass-ceramic as claimed in any one of claims 1-29.

36. The electronic device according to claim 33, characterized in that, The electronic device further includes a camera assembly, and the housing includes a camera protective cover that covers the camera assembly. The camera protective cover comprises reinforced glass-ceramic as described in any one of claims 1-30.

37. The electronic device according to claim 32, characterized in that, The electronic device further includes a mid-frame, the mid-frame comprising reinforced glass-ceramic as described in any one of claims 1-30.

38. A glass device, characterized in that, The glass device comprises a reinforced glass ceramic as described in any one of claims 1-30.

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