Toughened glass ceramic with high strength and use thereof

Abstract

The present application provides a toughened glass ceramic with a high strength and the use thereof. The toughened glass ceramic comprises a major crystal phase, i.e., a (Zn, Mg)Al2O4 crystal phase, and a secondary crystal phase, i.e., a tetragonal ZrO2 crystal phase. The toughened glass ceramic includes a compressive stress layer region extending from a surface of the toughened glass ceramic to a depth of compression, and there is a tensile stress layer region inside the toughened glass ceramic. The depth DOL_0 of a compressive stress layer of the toughened glass ceramic is greater than or equal to 0.21 t, wherein t is the thickness of the toughened glass ceramic; |CT_AV|≥70 MPa; and the toughened glass ceramic is endowed with a specific stress structure by satisfying the DOL_0 and |CT_AV|, and therefore the toughened glass ceramic has good drop impact resistance and a high mechanical strength.

Description

A Reinforced Glass-Ceramic with High Strength and Its Applications This application claims the priority of a Chinese patent application with the application number 202311800642.5 and the application title "A Reinforced Glass-Ceramic with High Strength and Its Applications", which was filed with the Chinese Patent Office on December 25, 2023. The entire content of this application is incorporated herein by reference in its entirety. Technical Field This application relates to the technical field of glass-ceramics, and particularly to a reinforced glass-ceramic with high strength and its applications. Background Art A common situation where the protective glass of an electronic device breaks is the drop-induced fracture. Analyzing the dropping process, it is generally due to the collision of the glass surface with sharp objects (such as fine sand, cement, small stones) whose hardness is equivalent to or greater than that of the glass, resulting in local damage and forming a hemispherical crack propagation source at the damage point. Part of the collision energy is attenuated, and the remaining energy further spreads. When the surface compressive stress level of the glass is insufficient to offset the remaining energy, the crack propagation will penetrate the glass surface area. When the longitudinal crack penetrates the depth of the compressive stress layer and reaches the region of the tensile stress layer (or also known as the tension stress layer), the crack will rapidly expand in the tensile stress area, causing the crack to penetrate the entire glass, thereby resulting in the breakage or fracture of the glass. It can be seen that the depth of the compressive stress layer and the deep stress situation of glass products are closely related to their anti-drop damage performance. When the depth of the compressive stress layer is constant, the greater the deep stress, the more the surface compressive stress level can offset the remaining energy of the drop collision. And when the surface compressive stress level is insufficient to offset the remaining energy of the drop collision, the deeper the depth of the compressive stress layer of the glass, the more conducive it is to offsetting the energy driving the crack propagation. Therefore, in order to further improve the anti-drop impact performance of glass-ceramics, it is necessary to develop a reinforced glass-ceramic with high mechanical strength, having a large deep stress and an ultra-high depth of the compressive stress layer, especially a high-strength transparent reinforced glass-ceramic with excellent light transmittance or transmittance. Summary of the Invention The purpose of this application is to provide a reinforced glass-ceramic with high strength and its applications. This reinforced glass-ceramic has a large deep stress and an ultra-high depth of the compressive stress layer, forming a specific stress structure, thereby endowing this reinforced glass-ceramic with excellent anti-drop impact performance. The technical solutions provided by this application are as follows: In a first aspect, a strengthened glass-ceramic is provided. In the strengthened glass-ceramic, a main crystal phase, i.e., a (Zn, Mg)Al2O4 crystal phase, and a secondary crystal phase, i.e., a tetragonal ZrO2 crystal phase, are included; the strengthened glass-ceramic includes a compressive stress layer region extending from the surface of the strengthened glass-ceramic to a compressive depth and has a tensile stress layer region inside; the depth of the compressive stress layer of the strengthened glass-ceramic, DOL_0≥0.21t, preferably, 0.21t≤DOL_0≤0.25t, where t is the thickness of the strengthened glass-ceramic; ∣CT_AV∣ of the strengthened glass-ceramic≥70 MPa, preferably, 70 MPa≤∣CT_AV∣≤110 MPa. The strengthened glass-ceramic of the present application has a (Zn, Mg)Al2O4 crystal phase with high hardness and high modulus (in the present application, (Zn, Mg)Al2O4 is used to represent a solid solution of zinc spinel and magnesium spinel, or also referred to as a zinc aluminate-spinel - magnesium aluminate-spinel solid solution, zinc-magnesium spinel solid solution, zinc spinel-magnesium spinel solid solution, zinc-magnesium aluminate spinel solid solution) as the main crystal phase, endowing the strengthened glass-ceramic with high intrinsic strength or inherent strength. At the same time, the ultra-high depth of the compressive stress layer and the relatively large deep-layer stress of the strengthened glass-ceramic of the present application endow the strengthened glass-ceramic with a specific stress structure. Through the synergistic effect of the specific crystal phase structure and the specific stress structure, the strengthened glass-ceramic of the present application has ultra-high mechanical strength, especially excellent anti-drop impact performance. In some embodiments of the present application, calculated based on the mass of the strengthened glass-ceramic, the total content of the (Zn, Mg)Al2O4 crystal phase and the tetragonal ZrO2 crystal phase is 25.00 wt% to 70.00 wt%, preferably 30.00 wt% to 50.00 wt%, where the ratio of the (Zn, Mg)Al2O4 crystal phase to the tetragonal ZrO2 crystal phase (i.e., the mass ratio of the (Zn, Mg)Al2O4 crystal phase to the tetragonal ZrO2 crystal phase) is 1.00 to 18.00, preferably 1.00 to 15.00; and / or, in the strengthened glass-ceramic, the average crystal size of the (Zn, Mg)Al2O4 crystal phase is 3.0 nm to 10.0 nm, preferably 4.0 nm to 7.5 nm, more preferably 4.5 nm to 7.5 nm; and / or, the strengthened glass-ceramic is transparent in the visible light range. When the total content of crystal phases W, the ratio of the (Zn, Mg)Al2O4 crystal phase to the tetragonal ZrO2 crystal phase (mass ratio Z), and the average crystal size of the (Zn, Mg)Al2O4 crystal phase in the strengthened glass-ceramic are within the above ranges, a specific crystal phase structure is endowed to the strengthened glass-ceramic. This crystal phase structure not only facilitates obtaining a desired stress structure during chemical strengthening of the glass-ceramic for chemical strengthening, but also enables the strengthened glass-ceramic obtained after strengthening to achieve excellent optical transparency. In some embodiments of the present application, in terms of the molar percentage of oxides, the composition at the center of the strengthened glass-ceramic comprises: SiO2 35.00 mol% to 60.00 mol%, Al2O3 20.00 mol% to 40.00 mol%, ZrO2 2.00 mol% to 8.00 mol%, MgO 3.00 mol% to 7.50 mol%, ZnO 7.00 mol% to 13.00 mol%, Na2O 1.00 mol% to 10.00 mol%, and Li2O 2.50 mol% to 10.00 mol%. By adopting the above glass formulation, it is beneficial to ensure the preparation of a glass-ceramic for chemical strengthening that meets the high intrinsic strength and has spinel as the main crystal phase, thereby helping to obtain a strengthened glass-ceramic that meets the desired stress structure. In some embodiments of the present application, the strengthened glass-ceramic contains 15.00 wt% to 45.00 wt% of (Zn,Mg)Al2O4 crystal phase based on the weight of the strengthened glass-ceramic. The (Zn,Mg)Al2O4 crystal is a crystal with high hardness and high modulus. By precipitating an appropriate amount of (Zn,Mg)Al2O4 in the glass-ceramic, it can endow the glass-ceramic with high intrinsic strength or inherent strength. At the same time, by controlling the content of the (Zn,Mg)Al2O4 crystal phase to make the glass-ceramic meet a specific crystal structure, it is beneficial to ensure that the glass-ceramic obtains an ideal stress structure during chemical strengthening. In some embodiments of the present application, take W [(Zn，Mg)Al2O4] as the weight percentage of the (Zn,Mg)Al2O4 crystal phase in the strengthened glass-ceramic, W [Al2O3] as the weight percentage of Al2O3 in the strengthened glass-ceramic, W [MgO] as the weight percentage of MgO in the strengthened glass-ceramic, W [ZnO] as the weight percentage of ZnO in the strengthened glass-ceramic, A = (1 - W [(Zn，Mg)Al2O4] / 2) × W [Al2O3] / 2, B = (1 - W [(Zn，Mg)Al2O4] ) × (W [MgO] + W [ZnO] ), C = A / B. In the strengthened glass-ceramic, 1.50 ≤ C ≤ 1.85. By optimizing the composition and structure to make the crystal phase content of the (Zn,Mg)Al2O4 crystal phase and the contents of Al2O3, MgO, and ZnO in the glass-ceramic meet the range of the above characteristic C, it can ensure that the glass-ceramic for chemical strengthening obtains the desired stress structure after chemical strengthening, and further enables the strengthened glass-ceramic to obtain high mechanical strength, especially excellent anti-damage performance. In some embodiments of the present application, the value of A is 10.00% to 25.00%, preferably 14.00% to 25.00%; and / or, the value of B is 7.50% to 12.50%, preferably 8.00% to 12.00%. By making the values of A and B satisfy the above ranges, it is beneficial to ensure that C satisfies its value range. In some embodiments of the present application, CS_50 of the strengthened glass-ceramic ≥ 100 MPa, preferably, 100 MPa ≤ CS_50 ≤ 250 MPa. The range of CS_50 of the strengthened glass-ceramic is within the above range, indicating that the compressive stress at a depth of 50 μm from the surface of the strengthened glass-ceramic is high, indicating that the strengthened glass-ceramic has a high surface stress level. In some embodiments of the present application, the Vickers hardness of the strengthened glass-ceramic is greater than or equal to 790 kgf / mm 2 , preferably 790 kgf / mm 2 ~1000 kgf / mm 2 . The Vickers hardness of the strengthened glass-ceramic is within the above range, indicating that the strengthened glass-ceramic has high hardness, thereby ensuring its excellent mechanical properties. In some embodiments of the present application, the fracture toughness of the strengthened glass-ceramic is greater than or equal to 1.00 MPa·m 1 / 2 , preferably greater than or equal to 1.20 MPa·m 1 / 2 , more preferably greater than or equal to 1.55 MPa·m 1 / 2 , for example, it can be preferably 1.55 MPa·m 1 / 2 ~2.00 MPa·m 1 / 2 . The fracture toughness of the strengthened glass-ceramic is within the above range, indicating that the strengthened glass-ceramic has high fracture toughness, thereby ensuring its excellent mechanical properties. In some embodiments of the present application, ∣CT_CV∣ of the strengthened glass-ceramic ≥ 80 MPa, preferably, 80 MPa ≤ ∣CT_CV∣ ≤ 150 MPa. The ∣CT_CV∣ of the strengthened glass-ceramic is within the above range, indicating that the strengthened glass-ceramic has a high tensile stress level, thereby reflecting its high surface stress level, and thus ensuring its excellent anti-damage performance. In some embodiments of the present application, in the X-ray diffraction pattern of the strengthened glass-ceramic, the peak with the maximum peak intensity among the characteristic peaks in the range of 2θ angle from 28° to 32° is taken as the first characteristic peak, and the peak with the maximum peak intensity among the characteristic peaks in the range of 2θ angle from 36° to 38° is taken as the second characteristic peak. The peak intensity ratio X of the first characteristic peak to the second characteristic peak is 0.80 to 1.50, and preferably the peak intensity ratio X is 0.85 to 1.30. In the XRD diffraction pattern, the peak intensity of the characteristic peak can reflect the integrity of the crystal in the glass-ceramic. By making the peak intensity ratio of the above two characteristic peaks within this range in the present application, it is helpful to obtain an appropriate crystal integrity, and further helpful to obtain better optical and strengthening effects. In some embodiments of the present application, in the X-ray diffraction pattern of the strengthened glass-ceramic, the

[0400] crystal plane characteristic peak of the (Zn, Mg)Al2O4 crystal phase is in the range of 2θ angle from 44° to 46°, the

[0311] crystal plane characteristic peak of the (Zn, Mg)Al2O4 crystal phase is in the range of 2θ angle from 34° to 38°, and the

[0440] crystal plane characteristic peak of the (Zn, Mg)Al2O4 crystal phase is in the range of 2θ angle from 64° to 67°; The full width at half maximum W of the

[0400]

[0400] crystal plane characteristic peak

[0400] is 0.650° to 1.800°, and preferably W is 0.900° to 1.600°;

[0311] The full width at half maximum W of the

[0311] crystal plane characteristic peak

[0311] is 0.900° to 2.800°, and preferably W is 1.100° to 2.230°;

[0440] The full width at half maximum W of the

[0440] crystal plane characteristic peak

[0440] is 0.750° to 2.000°, and preferably W is 0.900° to 1.600°. In the present application, the full width at half maximum of the

[0400] crystal plane characteristic peak, the

[0311] crystal plane characteristic peak, and the

[0440] crystal plane characteristic peak can reflect the crystal size of the (Zn, Mg)Al2O4 crystal in the glass-ceramic. By meeting the above range, it is beneficial to ensure that the glass-ceramic for chemical strengthening has a specific crystal size and crystal phase structure, and further helps to ensure that the strengthened glass-ceramic obtains the desired optical properties and stress level. In some embodiments of the present application, in terms of the molar percentage of oxides, the composition at the center of the strengthened glass-ceramic further includes: K2O 0.00 mol% to 5.00 mol%, CaO 0.00 mol% to 10.00 mol%, B2O3 0.00 mol% to 10.00 mol%, BaO 0.00 mol% to 5.00 mol%. In the glass system of the present application, K2O, CaO, B2O3 or BaO is used as an optional component, and appropriate use can improve the forming effect, crystallization effect, chemical strengthening effect or optical effect of the glass-ceramic to a certain extent. In some embodiments of the present application, in terms of the molar percentage of oxides, the composition at the center of the strengthened glass-ceramic includes: SiO2 35.00 mol% to 60.00 mol%, Al2O3 20.00 mol% to 40.00 mol%, ZrO2 2.00 mol% to 8.00 mol%, MgO 4.00 mol% to 7.00 mol%, ZnO 9.00 mol% to 12.00 mol%, Na2O 2.00 mol% to 10.00 mol%, Li2O 3.00 mol% to 10.00 mol%. By appropriately adjusting the content of MgO, ZnO, Li2O or Na2O, it helps to ensure that the content of the main crystal phase in the glass-ceramic for chemical strengthening meets the desired level, and at the same time helps to ensure that the glass-ceramic for chemical strengthening achieves the desired chemical strengthening effect, thereby obtaining a strengthened glass-ceramic with a high stress level. In some embodiments of the present application, in terms of the molar percentage of oxides, the composition at the center of the strengthened glass-ceramic includes: SiO2 35.00 mol% to 50.00 mol%, Al2O3 25.00 mol% to 35.00 mol%, ZrO2 3.00 mol% to 5.00 mol%, MgO 4.00 mol% to 7.00 mol%, ZnO 9.00 mol% to 12.00 mol%, Na2O 2.00 mol% to 10.00 mol%, Li2O 3.00 mol% to 10.00 mol%. By appropriately adjusting the content of each necessary oxide, it helps to ensure that the glass-ceramic for chemical strengthening achieves the desired crystal phase structure and glass network structure that can achieve a high stress level, thereby facilitating the obtaining of a strengthened glass-ceramic with a high stress level. In some embodiments of the present application, in terms of the molar percentage of each oxide in the composition of the strengthened glass-ceramic, the composition at the center of the strengthened glass-ceramic satisfies: 1.30 ≤ ZnO / MgO ≤ 2.50; and / or, 0.05 ≤ Li2O / (Al2O3 - (MgO + ZnO) + SiO2) ≤ 0.20; and / or, 0.19 ≤ (Al2O3 - (MgO + ZnO)) / SiO2 ≤ 0.60; and / or, 0.26 ≤ Na2O / Li2O ≤ 3.00. In some embodiments of the present application, in terms of the molar percentages of the respective oxides in the composition of the strengthened glass-ceramic, the composition at the center of the strengthened glass-ceramic further satisfies: 12.00 mol% ≤ ZnO + MgO ≤ 20.00 mol%, preferably, 13.00 mol% ≤ ZnO + MgO ≤ 17.30 mol%; and / or, 9.00 mol% ≤ Al2O3 - (MgO + ZnO) ≤ 22.00 mol%, preferably, 10.00 mol% ≤ Al2O3 - (MgO + ZnO) ≤ 20.00 mol%; and / or, 5.00 mol% ≤ Na2O + Li2O ≤ 15.00 mol%, preferably, 6.00 mol% ≤ Na2O + Li2O ≤ 13.50 mol%. In some embodiments of the present application, the transmittance of the 0.7 mm thick strengthened glass-ceramic at a wavelength of 550 nm is greater than or equal to 85.00%. The transmittance of the 0.7 mm thick strengthened glass-ceramic at a wavelength of 550 nm within the above range indicates that the strengthened glass-ceramic of the present application has high light transmittance. At the same time, the strengthened glass-ceramic of the present application also has high mechanical strength, especially excellent anti-drop impact performance, effectively broadening the application scenarios and application fields of the strengthened glass-ceramic of the present application. In some embodiments of the present application, for the 0.7 mm thick strengthened glass-ceramic, an anti-drop test is carried out using 80-mesh sandpaper, and the average anti-sandpaper drop height of the strengthened glass-ceramic is greater than or equal to 1.00 m, preferably the average anti-sandpaper drop height is greater than or equal to 1.40 m, and more preferably it is 1.50 m to 2.50 m. The average anti-sandpaper drop height H of the 0.7 mm thick strengthened glass-ceramic within the above range indicates that the strengthened glass-ceramic of the present application has excellent anti-drop impact performance. In some embodiments of the present application, the strengthened glass-ceramic is obtained by chemically strengthening a glass-ceramic for chemical strengthening, and the composition of the glass-ceramic for chemical strengthening is the same as the composition at the center of the strengthened glass-ceramic. In a second aspect, a glass device is provided, which is made of the strengthened glass-ceramic in any of the foregoing embodiments. In a third aspect, an electronic device is provided, which includes the strengthened glass-ceramic in any of the foregoing embodiments. In some embodiments of the present application, the electronic device includes at least one of a mobile phone, a tablet computer, a smart wearable device, a display, and a television. One or more technical solutions of the present application have the following advantages or beneficial effects: The present application provides a strengthened glass ceramic with high strength and its application. The strengthened glass ceramic of the present application has a (Zn, Mg)Al2O4 crystal phase (solid solution of zinc spinel and magnesium spinel) with high hardness and high modulus as the main crystal phase, endowing the strengthened glass ceramic with high intrinsic strength or inherent strength. At the same time, the ultra-high depth of the compressive stress layer and the relatively large deep-layer stress possessed by the strengthened glass ceramic of the present application endow the strengthened glass ceramic with a specific stress structure. Through the synergistic effect of the specific crystal phase structure and the specific stress structure, the strengthened glass ceramic of the present application has ultra-high mechanical strength and high anti-damage performance, especially excellent anti-drop impact performance. Description of the Drawings The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. FIG. 1 is a schematic structural diagram of the strengthened glass ceramic in some embodiments of the present application, where t is the thickness of the glass, d is the depth of the compressive stress layer, 11 is the compressive stress layer, and 12 is the tensile stress layer; FIG. 2 is a comparative diagram of XRD diffraction patterns of the glass ceramics for chemical strengthening in Examples 1 to 2 and Comparative Examples 6 to 9; FIG. 3 is an XRD diffraction pattern of the glass ceramic for chemical strengthening in Comparative Example 8; FIG. 4 is an XRD diffraction pattern of the glass ceramic for chemical strengthening in Example 2; FIG. 5 is an XRD diffraction pattern of the glass ceramic for chemical strengthening in Comparative Example 10; FIG. 6 is an XRD diffraction pattern of the glass ceramic for chemical strengthening in Comparative Example 11; FIG. 7 is a transmittance curve of the glass ceramic for chemical strengthening in Example 1 under different wavelength conditions; FIG. 8 is a comparative XRD diffraction diagram of the glass ceramic for chemical strengthening in Example 1 before and after chemical strengthening; FIG. 9 is a comparative diagram of transmittance curves of the glass ceramic for chemical strengthening in Example 1 before and after chemical strengthening under different wavelength conditions. Detailed Embodiments To make the objectives, technical solutions, and advantages of this application clearer and more understandable, the following provides examples with reference to the accompanying drawings to further elaborate on this application in detail. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of them. All other embodiments obtained by those skilled in the art based on this application fall within the scope of protection of this application. Glossary of Terms DOL_0: Depth of the compressive stress layer, also known as the depth of the compressive stress layer, refers to the distance along the thickness direction from any surface of the strengthened glass-ceramic to the position where the compressive stress near that surface is zero. ∣CT_AV∣: Refers to the absolute value of the average tensile stress in the tensile stress layer, specifically, the absolute value of the average of all tensile stresses in the tensile stress layer. Composition at the center of the strengthened glass-ceramic: Refers to the composition at or near the depth center of the strengthened glass-ceramic, that is, the composition of the region in the strengthened glass-ceramic that has not undergone ion exchange. It should be understood that the composition at the center of the strengthened glass-ceramic is the same or substantially the same as the composition of the glass-ceramic used to prepare the strengthened glass-ceramic but has not yet undergone chemical strengthening treatment (i.e., has not undergone ion exchange). CS_50: Refers to the compressive stress value at a depth of 50 μm measured from the surface of the strengthened glass-ceramic along the thickness direction. ∣CT_CV∣: Refers to the absolute value of the maximum tensile stress in the tensile stress layer, specifically, the absolute value of the maximum of all tensile stresses in the tensile stress layer. Substrate glass: Also known as base glass, refers to glass that has not been subjected to nucleation treatment, crystallization treatment, and strengthening treatment. Crystalline phase content: The percentage of the mass of the crystalline phase in the glass-ceramic in the total mass of the glass-ceramic. Peak intensity: Refers to the height of the diffraction peak in the XRD pattern. Full width at half maximum: Refers to the width at half the height of the diffraction peak in the XRD pattern, usually expressed in degrees or 2θ values. In this application, the glass-ceramic for chemical strengthening refers to the glass-ceramic material that can be used for chemical strengthening treatment to prepare the strengthened glass-ceramic. Glass-ceramic: Also known as glass-ceramics or crystallized glass, is a type of solid composite material that simultaneously contains a glass phase and a microcrystalline phase (or also known as a crystalline phase, crystallization phase, crystal phase). Theoretically speaking, when the depths of the compressive stress layers extending inward from the two main surfaces of a glass product are equal or approximately equal, and the sum of the depths of the two compressive stress layers is equal to the thickness of the tensile stress layer, that is, as shown in Figure 1, the depth d of the compressive stress layers 11 on both sides is approximately equal to 25% of the thickness t of the glass 10 respectively, and the thickness of the tensile stress layer 12 is approximately equal to 50% of the thickness t of the glass 10, the glass will reach the ideal depth of the compressive stress layer. However, in practice, in the prior art, almost no glass product has achieved this target effect. On the one hand, it is relatively difficult to achieve this depth of the compressive stress layer. On the other hand, in existing glass products, a relatively high depth of the compressive stress layer is often accompanied by a decrease in the surface stress level and a decrease in the overall strength of the glass product. Because in the ion exchange process of chemical strengthening treatment, the diffusion of ions becomes more and more difficult towards the inside, and simply increasing the amount of alkali metal ions to increase the diffusion amount is very likely to cause problems such as bursting and fragmentation due to excessive internal stress before reaching a relatively high depth. In addition, for many glass products, after the ion exchange diffusion reaches a certain depth and the stress reaches a certain level, stress relaxation will occur, the depth will increase slightly or not increase, but the stress will decrease significantly, resulting in a decrease in the strength of the glass product. Therefore, currently, only the depth of the compressive stress of the glass product can be made as close as possible to this ideal effect. In view of this, a strengthened glass ceramic with an ultra-high depth of the compressive stress layer and a large deep-layer stress, and its application are provided. Through the synergistic effect of a specific crystal phase structure and a specific stress structure, the strengthened glass ceramic of the present application has ultra-high mechanical strength and high anti-damage performance, and in particular, the strengthened glass ceramic has excellent anti-drop impact performance. In some embodiments of the present application, a strengthened glass-ceramic is provided. The strengthened glass-ceramic contains a main crystal phase of (Zn, Mg)Al2O4 crystal phase and a secondary crystal phase of tetragonal ZrO2 crystal phase. The strengthened glass-ceramic contains a region of a compressive stress layer extending from the surface of the strengthened glass-ceramic to a compressive depth, and has a region of a tensile stress layer inside the strengthened glass-ceramic. The depth of the compressive stress layer DOL_0 of the strengthened glass-ceramic is ≥0.21t. Preferably, 0.21t ≤ DOL_0 ≤ 0.25t, where t is the thickness of the strengthened glass-ceramic. In some embodiments of the present application, in the strengthened glass-ceramic, DOL_0 can be 0.21t to 0.24t, 0.22t to 0.24t, 0.23t to 0.24t, or 0.21t to 0.23t. In some embodiments of the present application, DOL_0 can be 0.21t, 0.22t, 0.23t, 0.24t, or 0.25t, or a value within the numerical range formed by any two of the above values, as long as a strengthened glass-ceramic with the required performance of the present application can be obtained. In some embodiments of the present application, when the thickness t of the strengthened glass-ceramic is 0.7 mm, 147 μm ≤ DOL_0 ≤ 175 μm. Specifically, DOL_0 can be 147 μm, 154 μm, 161 μm, 168 μm, or 175 μm, or a value within the numerical range formed by any two of the above values, as long as a strengthened glass-ceramic with the required performance of the present application can be obtained. The ∣CT_AV∣ of the strengthened glass-ceramic is ≥70 MPa. Preferably, 70 MPa ≤ ∣CT_AV∣ ≤ 110 MPa. In some embodiments of the present application, in the strengthened glass-ceramic, ∣CT_AV∣ can be 73 MPa to 108 MPa, 75 MPa to 105 MPa, 78 MPa to 100 MPa, 80 MPa to 98 MPa, or 83 MPa to 95 MPa. In some embodiments of the present application, ∣CT_AV∣ can be 70 MPa, 73 MPa, 75 MPa, 78 MPa, 80 MPa, 83 MPa, 85 MPa, 88 MPa, 90 MPa, 93 MPa, 95 MPa, 98 MPa, 100 MPa, 103 MPa, 105 MPa, 108 MPa, or 110 MPa, or a value within the numerical range formed by any two of the above values, as long as a strengthened glass-ceramic with the required performance of the present application can be obtained. By making the main crystal phase of the strengthened glass-ceramic be the spinel (Zn, Mg)Al2O4 crystal phase, having an ultra-high depth of the compressive stress layer and a relatively large tensile stress level, it is possible to endow the strengthened glass-ceramic with high mechanical strength, which is beneficial to greatly improving the anti-damage performance of the strengthened glass-ceramic, especially improving the anti-drop impact performance of the strengthened glass-ceramic. The thickness t of the strengthened glass-ceramic of the present application is not particularly limited as long as the object of the present application can be achieved. Exemplarily, the thickness t of the strengthened glass-ceramic satisfies: 0.2 mm ≤ t ≤ 5 mm, preferably 0.2 mm ≤ t ≤ 2 mm. In some embodiments of the present application, the glass-ceramic for chemical strengthening or the strengthened glass-ceramic is 2D, 2.5D, 3D or special-shaped, that is, the glass-ceramic for chemical strengthening can be a 2D, 2.5D, 3D or special-shaped product, and the strengthened glass-ceramic can also be a 2D, 2.5D, 3D or special-shaped product; and / or, the glass-ceramic for chemical strengthening or the strengthened glass-ceramic is of equal thickness or unequal thickness. Those skilled in the art can make a choice according to requirements. Here, "unequal thickness" means that the glass-ceramic for chemical strengthening or the strengthened glass-ceramic includes at least two parts with different thicknesses. In some embodiments of the present application, calculated based on the mass of the strengthened glass-ceramic, the total crystal phase content W of the (Zn, Mg)Al2O4 crystal phase and the tetragonal ZrO2 crystal phase is 25.00 wt% to 70.00 wt%, preferably 30.00 wt% to 50.00 wt%, wherein the ratio of the (Zn, Mg)Al2O4 crystal phase and the tetragonal ZrO2 crystal phase (referring to the mass ratio Z of the (Zn, Mg)Al2O4 crystal phase and the tetragonal ZrO2 crystal phase) is 1.00 to 18.00, preferably 1.00 to 15.00. In some embodiments of the present application, in the above-mentioned strengthened glass-ceramic, the average crystal size of the (Zn, Mg)Al2O4 crystal phase is 3.0 nm to 10.0 nm, preferably 4.0 nm to 7.5 nm, more preferably 4.5 nm to 7.5 nm. In some embodiments of the present application, the strengthened glass-ceramic is transparent in the visible light range. In the present application, the wavelength range of visible light is 360 nm to 740 nm, and "transparent in the visible light range" means that the average transmittance to visible light is greater than 80%. For spinel glass-ceramics containing the main crystal phase of (Zn, Mg)Al2O4 crystal phase and the secondary crystal phase of tetragonal ZrO2 crystal phase, simply increasing and introducing the quantity and types of metal ions that can undergo ion exchange cannot ensure the achievement of an ultra-high stress layer depth and deep stress. On the one hand, when the content of Li + and Na + in the glass-ceramic exceeds a certain amount, it is easy to have the problem of being unable to obtain a transparent glass-ceramic; on the other hand, the stress distribution after chemical strengthening of the glass-ceramic is jointly affected by the composition and crystal phase structure of the glass-ceramic. Simply increasing the quantity and types of alkali metal ions that can undergo ion exchange will not only cause changes in the composition of the glass-ceramic, but also cannot ensure that the glass-ceramic obtains a crystal phase structure that can achieve the desired stress distribution. Without being limited by theory, the composition and crystal phase structure of the glass-ceramic have a very close relationship with the stress distribution or stress structure after its chemical strengthening. By making the glass-ceramic meet the specific composition and crystal phase structure described above, it is possible to ensure that after the glass-ceramic is chemically strengthened, an ultra-high compressive stress layer depth and a large deep-layer stress are obtained. In some embodiments of the present application, calculated based on the mass of the strengthened glass-ceramic, the total crystal phase content W of the (Zn, Mg)Al2O4 crystal phase and the tetragonal ZrO2 crystal phase can be 25.00 wt%, 28.00 wt%, 30.00 wt%, 33.00 wt%, 35.00 wt%, 38.00 wt%, 40.00 wt%, 43.00 wt%, 45.00 wt%, 48.00 wt%, 50.00 wt%, 53.00 wt%, 55.00 wt%, 58.00 wt%, 60.00 wt%, 63.00 wt%, 65.00 wt%, 68.00 wt% or 70.00 wt%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. In some embodiments of the present application, calculated based on the mass of the strengthened glass-ceramic, the total crystal phase content W of the (Zn, Mg)Al2O4 crystal phase and the tetragonal ZrO2 crystal phase can be 25.00 wt% - 68.00 wt%, 28.00 wt% - 65.00 wt%, 32.00 wt% - 60.00 wt%, 35.00 wt% - 55.00 wt% or 40.00 wt% - 50.00 wt%. 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 required performance of the present application can be obtained. In some embodiments of the present application, in the above-mentioned strengthened glass-ceramic, the ratio (mass ratio Z) of the (Zn, Mg)Al2O4 crystal phase and the tetragonal ZrO2 crystal phase can be 1.00, 2.00, 3.00, 4.00, 5.00, 6.00, 7.00, 8.00, 9.00, 10.00, 11.00, 12.00, 13.00, 14.00, 15.00, 16.00, 17.00 or 18.00, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. In some embodiments of the present application, in the above-mentioned strengthened glass-ceramic, the ratio (mass ratio Z) of the (Zn, Mg)Al2O4 crystal phase and the tetragonal ZrO2 crystal phase can be 2.00 - 17.00, 4.00 - 15.00, 6.00 - 12.00 or 8.00 - 10.00. 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 required performance of the present application can be obtained. In some embodiments of the present application, in the above-mentioned strengthened glass-ceramics, the average crystal size of the (Zn, Mg)Al2O4 crystal phase can be 3.0 nm, 4.0 nm, 4.2 nm, 4.5 nm, 4.8 nm, 5.0 nm, 5.2 nm, 5.5 nm, 5.8 nm, 6.0 nm, 6.2 nm, 6.5 nm, 6.8 nm, 7.0 nm, 7.2 nm, 7.5 nm, 8.0 nm, 9.0 nm or 10.0 nm, or a value within the numerical range formed by any two of the above values, as long as the strengthened glass-ceramics with the required performance of the present application can be obtained. In some embodiments of the present application, in the above-mentioned strengthened glass-ceramics, the average crystal size of the (Zn, Mg)Al2O4 crystal phase can be 4.0 nm to 9.0 nm, 4.0 nm to 7.5 nm, 4.5 nm to 7.5 nm, 5.0 nm to 8.0 nm or 6.0 nm to 7.0 nm. 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-ceramics with the required performance of the present application can be obtained. In some embodiments of the present application, the strengthened glass-ceramics contain 15.00 wt% to 45.00 wt% of the (Zn, Mg)Al2O4 crystal phase. The (Zn, Mg)Al2O4 crystal is a crystal with high hardness and high modulus. By precipitating an appropriate amount of (Zn, Mg)Al2O4 in the glass-ceramics, high intrinsic strength or inherent strength can be imparted to the glass-ceramics. At the same time, by controlling the content of the (Zn, Mg)Al2O4 crystal phase, the glass-ceramics can be made to satisfy a specific crystal phase structure, which is beneficial to ensuring an ideal stress structure in the chemical strengthening of the glass-ceramics. In some embodiments of the present application, the crystal phase content W of the (Zn, Mg)Al2O4 crystal phase in the above-mentioned strengthened glass-ceramics [(Zn，Mg)Al2O4] can be 15.00 wt%, 18.00 wt%, 20.00 wt%, 23.00 wt%, 25.00 wt%, 28.00 wt%, 30.00 wt%, 33.00 wt%, 35.00 wt%, 38.00 wt%, 40.00 wt%, 43.00 wt% or 45.00 wt%, or a value within the numerical range formed by any two of the above values, as long as the strengthened glass-ceramics with the required performance of the present application can be obtained. In some embodiments of the present application, the crystal phase content W of the (Zn, Mg)Al2O4 crystal phase in the above-mentioned strengthened glass-ceramics [(Zn，Mg)Al2O4] can be 18.00 wt% to 44.00 wt%, 20.00 wt% to 42.00 wt%, 24.00 wt% to 40.00 wt%, 28.00 wt% to 38.00 wt% or 30.00 wt% to 35.00 wt%. ​In some embodiments of the present application, based on the quality of the strengthened glass-ceramics, the crystal phase content W of the tetragonal ZrO2 crystal phase [ZrO2] is 2.00 wt% to 16.00 wt%. The tetragonal ZrO2 crystal phase and the (Zn, Mg)Al2O4 crystal phase jointly determine the crystal phase structure inside the glass-ceramics. By meeting a specific content range, it is beneficial to ensure the structural strength of the glass-ceramics and to ensure an ideal stress structure after chemical strengthening of the glass-ceramics. In some embodiments of the present application, the crystal phase content W of the tetragonal ZrO2 crystal phase in the strengthened glass-ceramics [ZrO2] can be 2.00 wt%, 3.00 wt%, 4.00 wt%, 5.00 wt%, 6.00 wt%, 7.00 wt%, 8.00 wt%, 9.00 wt%, 10.00 wt%, 11.00 wt%, 12.00 wt%, 13.00 wt%, 14.00 wt%, 15.00 wt% or 16.00 wt%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramics with the required performance of the present application can be obtained. In some embodiments of the present application, in terms of mole percentage of oxides, the composition at the center of the strengthened glass-ceramics includes: SiO2 35.00 mol% to 60.00 mol%, Al2O3 20.00 mol% to 40.00 mol%, ZrO2 2.00 mol% to 8.00 mol%, MgO 3.00 mol% to 7.50 mol%, ZnO 7.00 mol% to 13.00 mol%, Na2O 1.00 mol% to 10.00 mol%, Li2O 2.50 mol% to 10.00 mol%. By adopting this glass formulation, it is beneficial to ensure the preparation of glass-ceramics for chemical strengthening with high intrinsic strength and with spinel as the main crystal phase, and thus contribute to obtaining strengthened glass-ceramics that meet the desired stress structure. It should be understood that after chemical strengthening and through the ion exchange process, the composition at the surface of the glass-ceramics product may be different from the composition of the glass-ceramics before the ion exchange process. This is because, during ion exchange, in the newly formed glass-ceramics (such as the glass-ceramics for chemical strengthening in the present application), one type of alkali metal ion at the surface of the glass-ceramics (for example, Li + or Na + ) will be respectively replaced by larger alkali metal ions (for example, Na + or K +) is replaced. However, in the embodiments, the glass composition and phase assemblage at or near the depth center of the glass-ceramic article will still be the same as those of the freshly formed glass-ceramic. That is to say, in the present application, the composition and phase assemblage at the center of the strengthened glass-ceramic are the same as or substantially the same as those of the freshly formed glass-ceramic (such as the glass-ceramic for chemical strengthening in the present application). Meanwhile, the glass-ceramic for chemical strengthening in the present application is obtained by heat-treating a base glass. Therefore, based on the molar percentage of oxides, the composition of the glass-ceramic for chemical strengthening is the same as that of the base glass. That is, in the present application, The composition of the base glass for preparing the glass-ceramic for chemical strengthening or the glass-ceramic for chemical strengthening, based on the molar percentage of oxides, includes: SiO2 35.00 mol% to 60.00 mol%, Al2O3 20.00 mol% to 40.00 mol%, ZrO2 2.00 mol% to 8.00 mol%, MgO 3.00 mol% to 7.50 mol%, ZnO 7.00 mol% to 13.00 mol%, Na2O 1.00 mol% to 10.00 mol%, and Li2O 2.50 mol% to 10.00 mol%. After heat-treating the base glass satisfying the above range to obtain a glass-ceramic for chemical strengthening with a specific crystal phase structure, the glass-ceramic for chemical strengthening can be chemically strengthened to obtain a strengthened glass-ceramic with an ultra-high depth of the compressive stress layer and a large deep-layer stress. In the present application, SiO2 is a network-forming oxide of the glass and an essential component for constructing the glass network structure. An appropriate amount of SiO2 can increase the stability and mechanical strength of the glass while taking into account the formability of the glass. In the present application, based on mol% of the oxide, in the composition at the center of the base glass, chemically strengthened glass ceramic, or strengthened glass ceramic, the content of SiO2 is 35.00 mol% to 60.00 mol%. In some embodiments of the present application, the content of SiO2 can be 35.00 mol%, 37.00 mol%, 40.00 mol%, 42.00 mol%, 45.00 mol%, 47.00 mol%, 50.00 mol%, 52.00 mol%, 55.00 mol%, 57.00 mol%, or 60.00 mol%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass ceramic with the required performance of the present application can be obtained. In some embodiments of the present application, the content of SiO2 can be 36.00 mol% to 58.00 mol%, 38.00 mol% to 55.00 mol%, 40.00 mol% to 52.00 mol%, 42.00 mol% to 50.00 mol%, or 44.00 mol% to 48.00 mol%. 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 required performance of the present application can be obtained. In the present application, an appropriate amount of Al2O3 can promote the precipitation of the main crystal phase and inhibit the precipitation of other impurity phases such as quartz, avoiding the problem of easy crystallization and devitrification of the glass during normal cooling caused by a fast crystallization rate, and at the same time being beneficial to increasing the rate of ion exchange during the strengthening process and improving the stress structure. In the present application, based on mol% of oxides, in the composition at the center of the substrate glass or chemically strengthened glass-ceramics or strengthened glass-ceramics, the content of Al2O3 is 20.00 mol% to 40.00 mol%. In some embodiments of the present application, the content of Al2O3 can be 20.00 mol%, 21.00 mol%, 22.00 mol%, 23.00 mol%, 24.00 mol%, 25.00 mol%, 26.00 mol%, 27.00 mol%, 28.00 mol%, 29.00 mol%, 30.00 mol%, 31.00 mol%, 32.00 mol%, 33.00 mol%, 34.00 mol%, 35.00 mol%, 36.00 mol%, 37.00 mol%, 38.00 mol%, 39.00 mol% or 40.00 mol%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramics with the required performance of the present application can be obtained. In some embodiments of the present application, the content of Al2O3 can be 21.00 mol% to 38.00 mol%, 22.00 mol% to 36.00 mol%, 23.00 mol% to 34.00 mol% or 25.00 mol% to 32.00 mol%. 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-ceramics with the required performance of the present application can be obtained. In the present application, ZrO₂ is an effective nucleating agent. During the heat treatment of the substrate glass, ZrO₂ precipitates in the substrate glass in the form of crystals first, and the ZrO₂ crystals become crystal nuclei for the growth of subsequent main crystal phase crystals. An appropriate amount of ZrO₂ is beneficial to the formation of spinel glass ceramics with a specific crystal phase structure. In the present application, based on mol% of oxides, in the composition at the center of the substrate glass or chemically strengthened glass ceramics or strengthened glass ceramics, the content of ZrO₂ is 2.00 mol% to 8.00 mol%. In some embodiments of the present application, the content of ZrO₂ can be 2.00 mol%, 2.50 mol%, 3.00 mol%, 3.50 mol%, 4.00 mol%, 4.50 mol%, 5.00 mol%, 5.50 mol%, 6.00 mol%, 6.50 mol%, 7.00 mol%, 7.50 mol% or 8.00 mol%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass ceramics with the required properties of the present application can be obtained. In some embodiments of the present application, the content of ZrO₂ can be 2.50 mol% to 7.80 mol%, 3.00 mol% to 7.50 mol%, 3.50 mol% to 7.00 mol%, 4.00 mol% to 6.50 mol% or 4.50 mol% to 6.00 mol%. 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 ceramics with the required properties of the present application can be obtained. In the present application, MgO and ZnO are essential components of the main crystal phase spinel. An appropriate amount of MgO and ZnO is beneficial to ensuring the formation of the main crystal phase with the desired content, and can also reduce the melting difficulty of the substrate glass to a certain extent. However, excessive MgO and ZnO easily lead to excessive growth of spinel grains, and it is difficult to obtain chemically strengthened glass ceramics with high transparency. In the present application, in the composition at the center of the substrate glass or chemically strengthened glass ceramics or strengthened glass ceramics, based on mol% of oxides, the content of MgO is 3.00 mol% to 7.50 mol%, and the content of ZnO is 7.00 mol% to 13.00 mol%. In some embodiments of the present application, the content of MgO can be 3.00 mol%, 3.50 mol%, 4.00 mol%, 4.50 mol%, 5.00 mol%, 5.50 mol%, 6.00 mol%, 6.50 mol%, 7.00 mol% or 7.50 mol%, or a value within the numerical range formed by any two of the above values, as long as the strengthened glass-ceramics with the required properties of the present application can be obtained. In some embodiments of the present application, the content of MgO can be 3.50 mol% to 7.00 mol%, 4.00 mol% to 6.50 mol% or 4.50 mol% to 6.00 mol%. 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-ceramics with the required properties of the present application can be obtained. In some embodiments of the present application, the content of ZnO can be 7.00 mol%, 7.50 mol%, 8.00 mol%, 8.50 mol%, 9.00 mol%, 9.50 mol%, 10.00 mol%, 10.50 mol%, 11.00 mol%, 11.50 mol%, 12.00 mol%, 12.50 mol% or 13.00 mol%, or a value within the numerical range formed by any two of the above values, as long as the strengthened glass-ceramics with the required properties of the present application can be obtained. In some embodiments of the present application, the content of ZnO can be 7.50 mol% to 12.50 mol%, 8.50 mol% to 12.00 mol%, 9.50 mol% to 11.50 mol% or 10.00 mol% to 11.00 mol%. 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-ceramics with the required properties of the present application can be obtained. In the present application, an appropriate amount of Na2O helps the glass-ceramic to obtain a high surface compressive stress during chemical strengthening, which is beneficial for the glass-ceramic to obtain a high surface stress level. At the same time, an appropriate amount of Na2O can reduce the melting temperature of the substrate glass and the crystallization temperature when preparing the glass-ceramic for chemical strengthening from the substrate glass, and can also prevent ceramization during the annealing process of the substrate glass, and avoid the precipitation of undesired impurity phases when the substrate glass is heat-treated to prepare the glass-ceramic for chemical strengthening. In the present application, based on mol% of the oxide, in the composition at the center of the substrate glass, the glass-ceramic for chemical strengthening, or the strengthened glass-ceramic, the content of Na2O is 1.00 mol% to 10.00 mol%. In some embodiments of the present application, the content of Na2O can be 1.00 mol%, 1.50 mol%, 2.00 mol%, 2.50 mol%, 3.00 mol%, 3.50 mol%, 4.00 mol%, 4.50 mol%, 5.00 mol%, 5.50 mol%, 6.00 mol%, 6.50 mol%, 7.00 mol%, 7.50 mol%, 8.00 mol%, 8.50 mol%, 9.00 mol%, 9.50 mol% or 10.00 mol%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. In some embodiments of the present application, the content of Na2O can be 1.50 mol% to 9.50 mol%, 2.50 mol% to 8.50 mol%, 3.50 mol% to 7.50 mol%, 4.50 mol% to 6.50 mol% or 5.00 mol% to 6.00 mol%. 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 required performance of the present application can be obtained. In the present application, an appropriate amount of Li2O helps the glass-ceramic to obtain a higher deep compressive stress and a high compressive stress layer depth during chemical strengthening, which is beneficial for the glass-ceramic to obtain a high deep stress level. At the same time, an appropriate amount of Li2O is beneficial for increasing the Young's modulus of the glass-ceramic. Meanwhile, it can reduce the melting temperature of the substrate glass and the crystallization temperature when preparing the glass-ceramic for chemical strengthening from the substrate glass, and can also prevent ceramization during the annealing process of the substrate glass, and avoid the precipitation of undesired impurity phases or the problem of excessive crystal growth when the substrate glass is heat-treated to prepare the glass-ceramic for chemical strengthening. If the content of Li2O is too low, it is easy to cause a decrease in the deep stress that can be obtained when the glass-ceramic for chemical strengthening is chemically strengthened. In the present application, based on mol% of the oxide, in the composition at the center of the substrate glass, the glass-ceramic for chemical strengthening, or the strengthened glass-ceramic, the content of Li2O is 2.50 mol% to 10.00 mol%. In some embodiments of the present application, the content of Li2O can be 2.50 mol%, 3.00 mol%, 3.50 mol%, 4.00 mol%, 4.50 mol%, 5.00 mol%, 5.50 mol%, 6.00 mol%, 6.50 mol%, 7.00 mol%, 7.50 mol%, 8.00 mol%, 8.50 mol%, 9.00 mol%, 9.50 mol% or 10.00 mol%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramics with the desired properties of the present application can be obtained. In some embodiments of the present application, the content of Li2O can be 3.00 mol% to 9.50 mol%, 4.00 mol% to 8.50 mol%, 5.00 mol% to 7.50 mol% or 6.00 mol% to 7.00 mol%. 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-ceramics with the desired properties of the present application can be obtained. In some embodiments of the present application, take W [(Zn，Mg)Al2O4] as the weight percentage of the (Zn, Mg)Al2O4 crystal phase in the strengthened glass-ceramics, W [Al2O3] as the weight percentage of Al2O3 in the strengthened glass-ceramics, W [MgO] as the weight percentage of MgO in the strengthened glass-ceramics, W [ZnO] as the weight percentage of ZnO in the strengthened glass-ceramics; A = (1 - W [(Zn，Mg)Al2O4] / 2) × W [Al2O3] / 2, B = (1 - W [(Zn，Mg)Al2O4] ) × (W [MgO] + W [ZnO] ), C = A / B, in the strengthened glass-ceramics, 1.50 ≤ C ≤ 1.85. By optimizing the composition and structure, making the crystal phase content of the (Zn, Mg)Al2O4 crystal phase, and the contents of Al2O3, MgO, and ZnO in the glass-ceramics meet the range of the above characteristic C, it can ensure that after chemical strengthening of the glass-ceramics for chemical strengthening, the desired stress structure can be obtained, and further the strengthened glass-ceramics can obtain high mechanical strength, especially excellent anti-damage performance. In some embodiments of the present application, the value of A is 10.00% to 25.00%, preferably 14.00% to 25.00%; and / or, the value of B is 7.50% to 12.50%, preferably 8.00% to 12.00%. By making the values of A and B satisfy the above ranges, it is beneficial to ensure that C satisfies its value range. In some embodiments of the present application, the value of A can be 10.00%, 11.00%, 12.00%, 13.00%, 14.00%, 15.00%, 16.00%, 17.00%, 18.00%, 19.00%, 20.00%, 21.00%, 22.00%, 23.00%, 24.00% or 25.00%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass ceramic with the required performance of the present application can be obtained. In some embodiments of the present application, the value of B can be 7.50%, 8.00%, 8.50%, 9.00%, 9.50%, 10.00%, 10.50%, 11.00%, 11.50%, 12.00% or 12.50%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass ceramic with the required performance of the present application can be obtained. In some embodiments of the present application, W [Al2O3] is 35.00 wt% to 50.00 wt%. In some embodiments of the present application, W [MgO] is 2.50 wt% to 4.00 wt%. In some embodiments of the present application, W [ZnO] is 9.50 wt% to 14.50 wt%. In some embodiments of the present application, the CS_50 of the strengthened glass-ceramic is ≥ 100 MPa, preferably, 100 MPa ≤ CS_50 ≤ 250 MPa. When the CS_50 of the strengthened glass-ceramic is within the above range, it indicates that the compressive stress at a depth of 50 μm from the surface of the strengthened glass-ceramic is high, which further shows that the strengthened glass-ceramic has a high surface stress level, thereby effectively improving the anti-damage performance of the strengthened glass-ceramic. In some embodiments of the present application, the CS_50 of the strengthened glass-ceramic can be 100 MPa, 110 MPa, 120 MPa, 130 MPa, 140 MPa, 150 MPa, 160 MPa, 170 MPa, 180 MPa, 190 MPa, 200 MPa, 210 MPa, 220 MPa, 230 MPa, 240 MPa or 250 MPa, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. In some embodiments of the present application, the CS_50 of the above-mentioned strengthened glass-ceramic can be 110 MPa to 240 MPa, 120 MPa to 230 MPa, 130 MPa to 220 MPa, 140 MPa to 210 MPa, 150 MPa to 200 MPa, 160 MPa to 190 MPa or 170 MPa to 180 MPa. 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 required performance of the present application can be obtained. In some embodiments of the present application, the Vickers hardness of the strengthened glass-ceramic is greater than or equal to 790 kgf / mm 2 , preferably 790 kgf / mm 2 ~1000 kgf / mm 2 . When the Vickers hardness of the strengthened glass-ceramic is within the above range, it indicates that the strengthened glass-ceramic has a high hardness, which further ensures its excellent mechanical properties and is beneficial to obtaining glass-ceramic products with excellent anti-damage performance. In some embodiments of the present application, the Vickers hardness of the strengthened glass-ceramic can be 790 kgf / mm 2 , 800 kgf / mm 2 , 810 kgf / mm 2 , 820 kgf / mm 2 , 830 kgf / mm 2 , 840 kgf / mm 2 , 850 kgf / mm 2 , 860 kgf / mm 2 , 870 kgf / mm 2 , 880 kgf / mm 2 , 890 kgf / mm 2, 900 kgf / mm 2 , 910 kgf / mm 2 , 920 kgf / mm 2 , 930 kgf / mm 2 , 940 kgf / mm 2 , 950 kgf / mm 2 , 960 kgf / mm 2 , 970 kgf / mm 2 , 980 kgf / mm 2 , 990 kgf / mm 2 or 1000 kgf / mm 2 , or a value within the numerical range formed by any two of the above values as endpoints, as long as the toughened glass-ceramics with the required performance of this application can be obtained. In some embodiments of this application, the Vickers hardness of the above-mentioned toughened glass-ceramics can be 800 kgf / mm 2 ~980 kgf / mm 2 , 820 kgf / mm 2 ~960 kgf / mm 2 , 840 kgf / mm 2 ~940 kgf / mm 2 , 860 kgf / mm 2 ~920 kgf / mm 2 or 880 kgf / mm 2 ~900 kgf / mm 2 . It should be understood that in specific implementation schemes, any of the above ranges can be combined with any other range, as long as the toughened glass-ceramics with the required performance of this application can be obtained. In some embodiments of this application, the fracture toughness of the toughened glass-ceramics is greater than or equal to 1.00 MPa·m 1 / 2 , preferably greater than or equal to 1.20 MPa·m 1 / 2 , more preferably greater than or equal to 1.55 MPa·m 1 / 2 , for example, can be preferably 1.55 MPa·m 1 / 2 ~2.00 MPa·m 1 / 2 . When the fracture toughness of the toughened glass-ceramics is within the above range, it shows that the toughened glass-ceramics have high fracture toughness, thus ensuring its excellent mechanical properties and being beneficial to obtaining glass-ceramic products with excellent anti-damage performance. In some embodiments of this application, the fracture toughness of the toughened glass-ceramics can be 1.00 MPa·m 1 / 2 , 1.20 MPa·m 1 / 2 , 1.55 MPa·m 1 / 2 , 1.60 MPa·m 1 / 2 , 1.65 MPa·m1 / 2 、 1.70 MPa·m 1 / 2 、 1.75 MPa·m 1 / 2 、 1.80 MPa·m 1 / 2 、 1.85 MPa·m 1 / 2 、 1.90 MPa·m 1 / 2 、 1.95 MPa·m 1 / 2 or 2.00 MPa·m 1 / 2 , or a value within the numerical range formed by any two of the above values as endpoints, as long as the toughened glass-ceramics with the required performance of the present application can be obtained. In some embodiments of the present application, the fracture toughness of the above toughened glass-ceramics can be 1.20 MPa·m 1 / 2 ~2.00 MPa·m 1 / 2 、 1.40 MPa·m 1 / 2 ~1.80 MPa·m 1 / 2 or 1.50 MPa·m 1 / 2 ~1.90 MPa·m 1 / 2 . It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the toughened glass-ceramics with the required performance of the present application can be obtained. In some embodiments of the present application, ∣CT_CV∣ of the toughened glass-ceramics ≥ 80 MPa, preferably, 80 MPa ≤ ∣CT_CV∣ ≤ 150 MPa. When ∣CT_CV∣ of the toughened glass-ceramics is within the above range, it indicates that the toughened glass-ceramics have a high tensile stress level, and further reflects that they have a high surface stress level, thus ensuring that they have excellent mechanical properties, which is beneficial to obtaining glass-ceramic products with excellent anti-damage performance. In some embodiments of the present application, ∣CT_CV∣ of the toughened glass-ceramics can be 80 MPa, 85 MPa, 90 MPa, 95 MPa, 100 MPa, 105 MPa, 110 MPa, 115 MPa, 120 MPa, 125 MPa, 130 MPa, 135 MPa, 140 MPa, 145 MPa or 150 MPa, or a value within the numerical range formed by any two of the above values as endpoints, as long as the toughened glass-ceramics with the required performance of the present application can be obtained. In some embodiments of the present application, ∣CT_CV∣ of the above toughened glass-ceramics can be 85 MPa~150 MPa, 90 MPa~145 MPa, 95 MPa~140 MPa, 100 MPa~135 MPa or 110 MPa~130 MPa. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the toughened glass-ceramics with the required performance of the present application can be obtained. The relevant characteristics of the X-ray diffraction pattern can reflect the crystal phase structure of the glass-ceramics, including the crystal phase composition, crystal size, etc. By making the glass-ceramics meet a specific crystal phase structure, on the one hand, it is beneficial for the glass-ceramics to obtain high intrinsic strength, and on the other hand, it is beneficial to improve the chemical strengthening effect of the glass-ceramics, enabling them to obtain an ultra-high compressive stress layer depth and a large deep-layer stress through chemical strengthening, thereby being conducive to enhancing the mechanical strength and anti-damage performance of the glass-ceramics. It should be understood that in the glass-ceramics of the present application, neither the main crystal phase (Zn, Mg)Al2O4 crystal phase nor the secondary crystal phase tetragonal ZrO2 crystal phase contains alkali metal ions, so they do not participate in the ion exchange during the chemical strengthening process. Based on this, the crystal phase structure of the strengthened glass-ceramics chemically strengthened in the present application is basically the same as that of the glass-ceramics used for chemical strengthening. That is, the crystal phase content, crystal composition, crystal size, and the characteristics of the X-ray diffraction pattern and other crystal phase structure characteristics of the strengthened glass-ceramics obtained through the chemical strengthening process in the present application are basically the same as those of the glass-ceramics used for chemical strengthening. As shown in Figure 8, in Example 1, the XRD patterns of the glass-ceramics used for chemical strengthening before chemical strengthening and the strengthened glass-ceramics after chemical strengthening are basically the same. In some embodiments of the present application, in the X-ray diffraction pattern of the strengthened glass-ceramics, the peak with the maximum peak intensity among the characteristic peaks in the range of 2θ angle from 28° to 32° is taken as the first characteristic peak, and the peak with the maximum peak intensity among the characteristic peaks in the range of 2θ angle from 36° to 38° is taken as the second characteristic peak. The peak intensity ratio X of the first characteristic peak and the second characteristic peak is 0.80 to 1.50, and preferably the peak intensity ratio X is 0.85 to 1.30. In the XRD pattern, the peak intensity of the characteristic peak can reflect the integrity of the crystals in the glass-ceramics. By making the peak intensity ratio of the above two characteristic peaks within this range in the present application, it is helpful to obtain an appropriate crystal integrity, and thus helpful to obtain better optical and strengthening effects. In some embodiments of the present application, the peak intensity ratio X can be 0.80, 0.90, 1.00, 1.10, 1.20, 1.30, 1.40, or 1.50, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramics with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramics with the required performance of the present application can be obtained. In some embodiments of the present application, in the X-ray diffraction pattern of the strengthened glass-ceramic, the characteristic peak of the

[0400] crystal plane of the (Zn, Mg)Al2O4 crystal phase is located at a 2θ angle in the range of 44° to 46°, the characteristic peak of the

[0311] crystal plane of the (Zn, Mg)Al2O4 crystal phase is located at a 2θ angle in the range of 34° to 38°, the characteristic peak of the

[0440] crystal plane of the (Zn, Mg)Al2O4 crystal phase is located at a 2θ angle in the range of 64° to 67°, and the full width at half maximum W of the

[0400] crystal plane characteristic peak

[0400] is 0.650° to 1.800°, preferably W

[0400] is 0.900° to 1.600°; the full width at half maximum W of the

[0311] crystal plane characteristic peak

[0311] is 0.900° to 2.800°, preferably W

[0311] is 1.100° to 2.230°; the full width at half maximum W of the

[0440] crystal plane characteristic peak

[0440] is 0.750° to 2.000°, preferably W

[0440] is 0.900° to 1.600°. In the present application, the full width at half maximum of the

[0400] crystal plane characteristic peak, the

[0311] crystal plane characteristic peak, and the

[0440] crystal plane characteristic peak can reflect the crystal size in the glass-ceramic. By satisfying the above ranges, it is beneficial to ensure that the glass-ceramic for chemical strengthening or the strengthened glass-ceramic has a specific crystal size and crystal phase structure, thereby helping to ensure that the strengthened glass-ceramic obtains the desired optical properties and stress levels. In some embodiments of the present application, the value of W

[0400] can be 0.650°, 0.700°, 0.800°, 0.900°, 1.000°, 1.100°, 1.200°, 1.300°, 1.400°, 1.500°, 1.600°, 1.700°, or 1.800°, or a value within the numerical range formed by any two of the above numerical values, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. In some embodiments of the present application, the value of W

[0311] can be 0.900°, 1.000°, 1.100°, 1.200°, 1.300°, 1.400°, 1.500°, 1.600°, 1.700°, 1.800°, 1.900°, 2.000°, 2.100°, 2.200°, 2.230°, 2.300°, 2.400°, 2.500°, 2.600°, 2.700°, or 2.800°, or a value within the numerical range formed by any two of the above numerical values, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. In some embodiments of the present application, the value of W

[0440] The value can be 0.750°, 0.800°, 0.900°, 1.000°, 1.100°, 1.200°, 1.300°, 1.400°, 1.500°, 1.600°, 1.700°, 1.800°, 1.900° or 2.000°, or a value within the numerical range formed by any two of the above numerical values as endpoints, as long as the strengthened glass-ceramics with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramics with the required performance of the present application can be obtained. In some embodiments of the present application, in terms of the molar percentage of oxides, the composition at the center of the substrate glass or the glass-ceramics for chemical strengthening or the strengthened glass-ceramics after chemical strengthening further includes: K2O 0.00 mol% to 5.00 mol%, CaO 0.00 mol% to 10.00 mol%, B2O3 0.00 mol% to 10.00 mol%, BaO 0.00 mol% to 5.00 mol%. In the present application, K2O, CaO, B2O3 or BaO are optional components, and appropriate use can have a certain improvement effect on the forming effect, crystallization effect, chemical strengthening effect or optical effect of the glass-ceramics. In the present application, an appropriate amount of K2O helps to improve the formability of the substrate glass and helps to reduce the crystallization tendency of the substrate glass during the preparation process. In the present application, in terms of mol% of oxides, the content of K2O in the composition at the center of the substrate glass or the glass-ceramics for chemical strengthening or the strengthened glass-ceramics is 0.00 mol% to 5.00 mol%. In some embodiments of the present application, K2O can be 0.00 mol%, 0.50 mol%, 1.00 mol%, 1.50 mol%, 2.00 mol%, 2.50 mol%, 3.00 mol%, 3.50 mol%, 4.00 mol%, 4.50 mol% or 5.00 mol%, or a value within the numerical range formed by any two of the above numerical values as endpoints, as long as the strengthened glass-ceramics with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramics with the required performance of the present application can be obtained. In the present application, an appropriate amount of B2O3 helps to reduce the melting difficulty of the substrate glass, promotes the precipitation of the main crystal phase spinel, and also effectively avoids the occurrence of opacification or the precipitation of impurity phases that affect the optical properties of the glass-ceramics during the heat treatment of the substrate glass to prepare chemically strengthened glass-ceramics. In the present application, in terms of mol% of oxides, in the composition at the center of the substrate glass, chemically strengthened glass-ceramics, or strengthened glass-ceramics, the content of B2O3 is 0.00 mol% to 10.00 mol%. In some embodiments of the present application, B2O3 can be 0.00 mol%, 0.50 mol%, 1.00 mol%, 1.50 mol%, 2.00 mol%, 2.50 mol%, 3.00 mol%, 3.50 mol%, 4.00 mol%, 4.50 mol%, 5.00 mol%, 5.50 mol%, 6.00 mol%, 6.50 mol%, 7.00 mol%, 7.50 mol%, 8.00 mol%, 8.50 mol%, 9.00 mol%, 9.50 mol%, or 10.00 mol%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramics with the required properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramics with the required properties of the present application can be obtained. In the present application, an appropriate amount of BaO helps to improve the melting effect of the substrate glass and can also inhibit the growth of grains to a certain extent, thereby having a certain improvement effect on the optical properties of the glass-ceramics. In the present application, in terms of mol% of oxides, in the composition at the center of the substrate glass, chemically strengthened glass-ceramics, or strengthened glass-ceramics, the content of BaO is 0.00 mol% to 5.00 mol%. In some embodiments of the present application, BaO can be 0.00 mol%, 0.50 mol%, 1.00 mol%, 1.50 mol%, 2.00 mol%, 2.50 mol%, 3.00 mol%, 3.50 mol%, 4.00 mol%, 4.50 mol%, or 5.00 mol%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramics with the required properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramics with the required properties of the present application can be obtained. In the present application, an appropriate amount of CaO helps to reduce the viscosity of the glass melt, improve the formability, strain point and Young's modulus of the glass, and helps to improve the ion exchange ability of the glass-ceramics. At the same time, an appropriate amount of CaO helps to improve the gloss and transparency of the glass, helps to reduce the crystallization tendency of the substrate glass, and helps to slow down the hardening rate of the glass. In the present application, in terms of mol% of oxides, in the composition at the center of the substrate glass or the glass-ceramics for chemical strengthening or the strengthened glass-ceramics, the content of CaO is 0.00 mol% to 10.00 mol%. In some embodiments of the present application, CaO can be 0.00 mol%, 0.50 mol%, 1.00 mol%, 1.50 mol%, 2.00 mol%, 2.50 mol%, 3.00 mol%, 3.50 mol%, 4.00 mol%, 4.50 mol%, 5.00 mol%, 5.50 mol%, 6.00 mol%, 6.50 mol%, 7.00 mol%, 7.50 mol%, 8.00 mol%, 8.50 mol%, 9.00 mol%, 9.50 mol% or 10.00 mol%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramics with the required properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramics can be obtained. In some embodiments of the present application, in terms of the molar percentage of oxides, the composition at the center of the substrate glass for preparing the glass-ceramics for chemical strengthening or the glass-ceramics for chemical strengthening or the strengthened glass-ceramics includes: SiO2 35.00 mol% to 60.00 mol%, Al2O3 20.00 mol% to 40.00 mol%, ZrO2 2.00 mol% to 8.00 mol%, MgO 3.00 mol% to 7.50 mol%, ZnO 7.00 mol% to 13.00 mol%, Na2O 1.00 mol% to 10.00 mol%, Li2O 2.50 mol% to 10.00 mol%, K2O 0.00 mol% to 5.00 mol%, CaO 0.00 mol% to 10.00 mol%, B2O3 0.00 mol% to 10.00 mol%, BaO 0.00 mol% to 5.00 mol%. By adopting the above glass formulation, it is beneficial to ensure the preparation of glass-ceramics for chemical strengthening with high intrinsic strength and with spinel as the main crystal phase, and thus helps to obtain strengthened glass-ceramics that meet the desired stress structure. In some embodiments of the present application, in terms of molar percentage of oxides, the composition at the center of the base glass for preparing glass ceramics for chemical strengthening, or the glass ceramics for chemical strengthening, or the strengthened glass ceramics, includes: SiO2 35.00 mol% to 50.00 mol%, Al2O3 25.00 mol% to 35.00 mol%, ZrO2 3.00 mol% to 5.00 mol%, MgO 4.00 mol% to 7.00 mol%, ZnO 9.00 mol% to 12.00 mol%, Na2O 2.00 mol% to 10.00 mol%, Li2O 3.00 mol% to 10.00 mol%, K2O 0.00 mol% to 5.00 mol%, CaO 0.00 mol% to 10.00 mol%, B2O3 0.00 mol% to 10.00 mol%, BaO 0.00 mol% to 5.00 mol%. By appropriately adjusting the contents of the necessary oxides, it helps to ensure that the glass ceramics for chemical strengthening obtain the desired crystal phase structure and glass network structure that can achieve a high stress level, and thus is conducive to obtaining strengthened glass ceramics with a high stress level. In some embodiments of the present application, in terms of molar percentage of oxides, the composition at the center of the base glass for preparing glass ceramics for chemical strengthening, or the glass ceramics for chemical strengthening, or the strengthened glass ceramics, includes: SiO2 35.00 mol% to 60.00 mol%, Al2O3 20.00 mol% to 40.00 mol%, ZrO2 2.00 mol% to 8.00 mol%, MgO 4.00 mol% to 7.00 mol%, ZnO 9.00 mol% to 12.00 mol%, Na2O 2.00 mol% to 10.00 mol%, Li2O 3.00 mol% to 10.00 mol%, K2O 0.00 mol% to 5.00 mol%, CaO 0.00 mol% to 10.00 mol%, B2O3 0.00 mol% to 10.00 mol%, BaO 0.00 mol% to 5.00 mol%. By appropriately adjusting the contents of MgO, ZnO, Li2O or Na2O, it helps to ensure that the content of the main crystal phase in the glass ceramics for chemical strengthening meets the desired level, and at the same time, it also helps to ensure that the glass ceramics for chemical strengthening achieve the desired chemical strengthening effect, and thus obtain strengthened glass ceramics with a high stress level. In some embodiments of the present application, in terms of the molar percentages of the respective oxides in the composition, the composition at the center of the base glass for preparing the glass-ceramic for chemical strengthening, or the glass-ceramic for chemical strengthening, or the strengthened glass-ceramic, satisfies: 1.30 ≤ ZnO / MgO ≤ 2.50; by making ZnO and MgO satisfy a specific content relationship, it is beneficial to ensure the formation of the desired main crystal phase structure. In some embodiments of the present application, the value of ZnO / MgO can be 1.30, 1.40, 1.50, 1.60, 1.70, 1.80, 1.90, 2.00, 2.10, 2.20, 2.30, 2.40 or 2.50, or a value within the numerical range formed by any two of the above numerical values, as long as the strengthened glass-ceramic with the performance required by the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramic with the performance required by the present application can be obtained. In some embodiments of the present application, in terms of the molar percentages of the respective oxides in the composition, the composition at the center of the base glass for preparing the glass-ceramic for chemical strengthening, or the glass-ceramic for chemical strengthening, or the strengthened glass-ceramic, satisfies: 0.05 ≤ Li2O / (Al2O3 - (MgO + ZnO) + SiO2) ≤ 0.20; by making Li2O, Al2O3, MgO, ZnO and SiO2 satisfy a specific content relationship, it helps to improve the ion exchange performance of the glass-ceramic, helps the glass-ceramic to obtain a high compressive stress layer depth and a large deep layer stress through chemical strengthening, and further helps to improve the anti-damage performance of the strengthened glass-ceramic, especially to improve its anti-drop impact performance. In some embodiments of the present application, the value of Li2O / (Al2O3 - (MgO + ZnO) + SiO2) can be 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 a value within the numerical range formed by any two of the above numerical values, as long as the strengthened glass-ceramic with the performance required by the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramic with the performance required by the present application can be obtained. In some embodiments of the present application, in terms of the molar percentages of the respective oxides in the composition, the composition at the center of the base glass for preparing the glass-ceramic for chemical strengthening, or the glass-ceramic for chemical strengthening, or the strengthened glass-ceramic, satisfies: 0.19 ≤ (Al2O3 - (MgO + ZnO)) / SiO2 ≤ 0.60; by making Al2O3, MgO, ZnO and SiO2 satisfy a specific content relationship, an appropriate amount of Al in the residual glass phase of the glass-ceramic can be ensured. On the one hand, it helps to exert the synergistic effect of Si and Al, enabling the residual glass phase to form a specific network structure, thereby improving the intrinsic strength of the glass-ceramic. On the other hand, it helps to promote ion exchange and improve the chemical strengthening effect of the glass-ceramic. In some embodiments of the present application, the value of (Al2O3 - (MgO + ZnO)) / SiO2 can be 0.19, 0.20, 0.23, 0.25, 0.28, 0.30, 0.33, 0.35, 0.38, 0.40, 0.43, 0.45, 0.48, 0.50, 0.53, 0.55, 0.58 or 0.60, or a value within the numerical range formed by any two of the above numerical values as endpoints, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. In some embodiments of the present application, in terms of the molar percentages of the respective oxides in the composition, the composition at the center of the base glass for preparing the glass-ceramic for chemical strengthening, or the glass-ceramic for chemical strengthening, or the strengthened glass-ceramic, satisfies: 0.26 ≤ Na2O / Li2O ≤ 3.00; by making Na and Li satisfy a specific content relationship, it helps to ensure the desired surface stress level and deep stress level after chemical strengthening of the glass-ceramic, thereby obtaining the desired stress structure and achieving high mechanical strength and high anti-damage performance. In some embodiments of the present application, the value of Na2O / Li2O can be 0.26, 0.30, 0.50, 0.80, 1.00, 1.20, 1.50, 1.80, 2.00, 2.20, 2.30, 2.50, 2.80 or 3.00, or a value within the numerical range formed by any two of the above numerical values as endpoints, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. In some embodiments of the present application, in terms of the molar percentages of the respective oxides in the composition, the composition at the center of the base glass for preparing the glass-ceramic for chemical strengthening, or the glass-ceramic for chemical strengthening, or the strengthened glass-ceramic, further satisfies: 12.00 mol% ≤ ZnO + MgO ≤ 20.00 mol%, preferably, 13.00 mol% ≤ ZnO + MgO ≤ 17.30 mol%; by having a sufficient amount of ZnO and MgO in the composition, it helps to ensure that a sufficient content of the main crystal phase can precipitate in the glass-ceramic, so as to form the desired crystal phase structure. In some embodiments of the present application, the value of ZnO + MgO can be 12.00 mol%, 13.00 mol%, 13.30 mol%, 13.50 mol%, 13.80 mol%, 14.00 mol%, 14.30 mol%, 14.50 mol%, 14.80 mol%, 15.00 mol%, 15.30 mol%, 15.50 mol%, 15.80 mol%, 16.00 mol%, 16.30 mol%, 16.50 mol%, 16.80 mol%, 17.00 mol%, 17.30 mol%, 18.00 mol%, 19.00 mol% or 20.00 mol%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. In some embodiments of the present application, in terms of the molar percentages of the respective oxides in the composition, the composition at the center of the base glass for preparing the glass-ceramic for chemical strengthening, or the glass-ceramic for chemical strengthening, or the strengthened glass-ceramic, further satisfies: 9.00 mol% ≤ Al2O3 - (MgO + ZnO) ≤ 22.00 mol%, preferably, 10.00 mol% ≤ Al2O3 - (MgO + ZnO) ≤ 20.00 mol%; by making the content of Al2O3 in the composition higher than the sum of the contents of MgO and ZnO, while ensuring the formation of the main crystal phase, an appropriate amount of Al can exist in the residual glass phase. On the one hand, it helps to exert the synergistic effect of Si and Al, making the residual glass phase Form a specific network structure to improve the intrinsic strength of the glass-ceramic. On the other hand, it helps to promote ion exchange and improve the chemical strengthening effect of the glass-ceramic. In some embodiments of the present application, the value of Al2O3-(MgO+ZnO) can be 9.00 mol%, 10.00 mol%, 11.00 mol%, 12.00 mol%, 13.00 mol%, 14.00 mol%, 15.00 mol%, 16.00 mol%, 17.00 mol%, 18.00 mol%, 19.00 mol%, 20.00 mol%, 21.00 mol% or 22.00 mol%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. In some embodiments of the present application, based on the molar percentages of the respective oxides in the composition, the composition at the center of the base glass for preparing the glass-ceramic for chemical strengthening, or the glass-ceramic for chemical strengthening, or the strengthened glass-ceramic, also satisfies: 5.00 mol% ≤ Na2O + Li2O ≤ 15.00 mol%, preferably, 6.00 mol% ≤ Na2O + Li2O ≤ 13.50 mol%. By having a sufficient amount of Na and Li in the composition, it helps to improve the ion exchange performance of the glass-ceramic, thereby ensuring that the desired surface stress level and deep stress level are obtained after chemical strengthening of the glass-ceramic, so as to obtain the desired stress structure and achieve high mechanical strength and high anti-damage performance. In some embodiments of the present application, the value of Na2O + Li2O can be 5.00 mol%, 5.50 mol%, 6.00 mol%, 6.50 mol%, 7.00 mol%, 7.50 mol%, 8.00 mol%, 8.50 mol%, 9.00 mol%, 9.50 mol%, 10.00 mol%, 10.50 mol%, 11.00 mol%, 11.50 mol%, 12.00 mol%, 12.50 mol%, 13.00 mol%, 13.50 mol%, 14.00 mol%, 14.50 mol% or 15.00 mol%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the strengthened glass-ceramic with the required performance of the present application can be obtained. In this application, each substance in the above relationships ZnO / MgO, Li2O / (Al2O3-(MgO+ZnO)+SiO2), (Al2O3-(MgO+ZnO)) / SiO2, Na2O / Li2O, ZnO+MgO, Al2O3-(MgO+ZnO), Na2O+Li2O represents the molar percentage content of the corresponding substance. For example, ZnO represents the molar percentage content of ZnO, MgO represents the molar percentage content of MgO, etc. This application will not elaborate one by one. In some embodiments of this application, the transmittance T of the strengthened glass-ceramics with a thickness of 0.7 mm under light with a wavelength of 550 nm is greater than or equal to 85.00%. The transmittance of the strengthened glass-ceramics with a thickness of 0.7 mm under light with a wavelength of 550 nm within the above range indicates that the strengthened glass-ceramics of this application have high light transmittance. At the same time, the strengthened glass-ceramics of this application also have excellent anti-damage performance, especially excellent anti-drop impact performance, effectively broadening the application scenarios and application fields of the strengthened glass-ceramics of this application. In some embodiments of this application, the transmittance T can be 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramics with the required performance of this application can be obtained. As shown in Figure 9, in this application, before and after chemical strengthening, the transmittance of the glass-ceramics for chemical strengthening is basically the same as that of the strengthened glass-ceramics. That is to say, in this application, by using glass-ceramics for chemical strengthening with high transmittance, strengthened glass-ceramics products with equally excellent transmittance can be obtained through chemical strengthening treatment. In some embodiments of this application, for the strengthened glass-ceramics with a thickness of 0.7 mm, an anti-drop test is carried out using 80-mesh sandpaper. The average anti-sandpaper drop height H of the strengthened glass-ceramics is greater than or equal to 1.00 m, preferably the average anti-sandpaper drop height is greater than or equal to 1.40 m, and more preferably it is 1.50 m to 2.50 m. The average anti-sandpaper drop height H of the strengthened glass-ceramics with a thickness of 0.7 mm within the above range indicates that the strengthened glass-ceramics of this application have high mechanical strength and high anti-damage performance. In some embodiments of this application, the average anti-sandpaper drop height H can be 1.50 m, 1.60 m, 1.70 m, 1.80 m, 1.90 m, 2.00 m, 2.10 m, 2.20 m, 2.30 m, 2.40 m or 2.50 m, or a value within the numerical range formed by any two of the above values as endpoints, as long as the strengthened glass-ceramics with the required performance of this application can be obtained. In some embodiments of the present application, the strengthened glass-ceramic is obtained by subjecting a chemically strengthened glass-ceramic to a chemically strengthened treatment, and the composition of the chemically strengthened glass-ceramic is the same as or substantially the same as the composition at the center of the strengthened glass-ceramic. The preparation method of the reinforced glass-ceramic in any of the aforementioned embodiments of the present application may include but is not limited to the following steps: (1) Preparation of substrate glass: Expressed as the molar percentage of oxides, the substrate glass or reinforced glass-ceramic is prepared according to the composition at the center of any of the aforementioned embodiments. After uniform mixing, the substrate glass is prepared by conventional methods known in the art. The substrate glass preparation methods include but are not limited to float, overflow, rolling, casting or continuous melting methods. The present application does not limit the parameters in the substrate glass preparation process, as long as a transparent substrate glass with the required performance of the present application can be obtained. (2) Preparation of chemically strengthened glass ceramics: The base glass obtained in step (1) is subjected to heat treatment, wherein the heat treatment includes but is not limited to one-step heat treatment or multiple-step heat treatment, to obtain chemically strengthened glass ceramics. (3) Chemical strengthening treatment: The chemically strengthened glass ceramic obtained in step (2) is subjected to chemical strengthening treatment to obtain the strengthened glass ceramic in any of the aforementioned embodiments. In some embodiments of the present application, the preparation method of the substrate glass in the above step (1) may include but is not limited to the following steps: batching according to the composition at the center of the substrate glass or strengthened glass ceramic in any of the aforementioned embodiments, mixing evenly, melting, molding, cooling, and annealing to obtain the substrate glass. The present application has no special restrictions on the melting temperature and time, as long as each component can be fully melted. Preferably, the melting temperature is 1550℃~1800℃, and the preferred melting time is 3h~12h. The present application does not limit the molding method, as long as the purpose of the present application can be achieved, for example, it can be cast into a molding mold to form a glass brick. The present application does not limit the cooling temperature, as long as the purpose of the present application can be achieved. Preferably, the cooling temperature is 800℃~1000℃. The present application does not limit the annealing temperature and time, as long as the purpose of the present application can be achieved. Preferably, the annealing temperature is 500℃~700℃ and the time is 20h~26h. In some embodiments of the present application, the heat treatment in step (2) above includes nucleation treatment and crystallization treatment. Preferably, the temperature T1 of the nucleation treatment is 600°C to 850°C, more preferably T1 is 650°C to 850°C. In some embodiments of the present application, the temperature T1 of the nucleation treatment can be 600°C, 625°C, 650°C, 675°C, 680°C, 690°C, 700°C, 710°C, 720°C, 725°C, 730°C, 740°C, 750°C, 775°C, 800°C, 825°C or 850°C, or a value within the numerical range formed by any two of the above values, as long as the glass-ceramic for chemical strengthening with the required properties of the present application can be obtained. Preferably, the nucleation treatment time t1 is 0h to 72h, more preferably t1 is 0h to 24h, and more preferably t1 is 0h to 8h. In some embodiments of the present application, the nucleation treatment time t1 can be 0h, 1h, 2h, 3h, 4h, 5h, 6h, 7h, 8h, 16h, 24h, 32h, 40h, 48h, 56h, 64h or 72h, or a value within the numerical range formed by any two of the above values, as long as the glass-ceramic for chemical strengthening with the required properties of the present application can be obtained. Preferably, the temperature T2 of the crystallization treatment is 700°C to 1000°C. In some embodiments of the present application, the temperature T2 of the crystallization treatment can be 700°C, 710°C, 720°C, 730°C, 740°C, 750°C, 760°C, 770°C, 780°C, 790°C, 800°C, 810°C, 820°C, 830°C, 840°C, 850°C, 875°C, 900°C, 925°C, 950°C, 975°C or 1000°C, or a value within the numerical range formed by any two of the above values, as long as the glass-ceramic for chemical strengthening with the required properties of the present application can be obtained. Preferably, the crystallization treatment time t2 is 10 min to 400 min, preferably t2 is 10 min to 120 min. In some embodiments of the present application, the crystallization treatment time t2 can be 10 min, 20 min, 30 min, 40 min, 50 min, 60 min, 70 min, 80 min, 90 min, 100 min, 110 min, 120 min, 150 min, 170 min, 200 min, 220 min, 250 min, 280 min, 300 min, 320 min, 350 min, 370 min or 400 min, or a value within the numerical range formed by any two of the above values, as long as the glass-ceramic for chemical strengthening with the required properties of the present application can be obtained. In this application, when preparing glass ceramics for chemical strengthening by heat-treating substrate glass, one-step heat treatment can be carried out, or two-step or multi-step heat treatment can be carried out. If one-step heat treatment is carried out, it means that the nucleation treatment is not carried out separately, and direct one-step heating is carried out. The nucleation and the growth of target crystals are carried out at the temperature reached during the one-step heating process, which can be understood as directly carrying out the crystallization treatment. If two-step heat treatment is carried out, it means that two heating processes are carried out. First, the nucleation treatment, that is, the nucleation process, is carried out, and then the growth treatment of the target crystals, that is, the crystallization treatment, is carried out. If multi-step heat treatment is carried out, the stepwise heating method is adopted in the nucleation treatment stage and / or the crystallization treatment stage. That is to say, during the whole heat treatment process, multiple (more than two) heating processes will be carried out. In this application, the nucleation treatment is to heat up to the specified nucleation treatment temperature (also called the nucleation temperature), and after reaching the nucleation treatment temperature, keep it warm for a certain period of time. Here, the holding time is the nucleation treatment time (also called the nucleation time); the crystallization treatment is to heat up to the specified crystallization treatment temperature (also called the crystallization temperature), and after reaching the crystallization treatment temperature, keep it warm for a certain period of time. Here, the holding time is the crystallization treatment time (also called the crystallization time). In some embodiments of this application, in step (2), when carrying out heat treatment, it is preferably to control the heating rate to be 5K / min to 15K / min, preferably 5K / min to 10K / min. In some embodiments of this application, the heating rate can be 5K / min, 6K / min, 7K / min, 8K / min, 9K / min, 10K / min, 11K / min, 12K / min, 13K / min, 14K / min or 15K / min, or a value within the numerical range formed by any two of the above values as endpoints, as long as the glass ceramics for chemical strengthening with the required performance of this application can be obtained. In some embodiments of the present application, in step (3), the salt bath for chemical strengthening treatment is a molten salt containing potassium salt and / or sodium salt. The potassium salt includes one or more of potassium nitrate, potassium sulfate, and potassium carbonate, preferably potassium nitrate; the sodium salt includes at least one of sodium nitrate, sodium sulfate, and sodium carbonate, preferably sodium nitrate. Preferably, the temperature T3 of the salt bath for chemical strengthening treatment is 380°C to 600°C, preferably T3 is 400°C to 550°C, and more preferably T3 is 400°C to 500°C. In some embodiments of the present application, the temperature T3 of the salt bath for chemical strengthening treatment can be 380°C, 400°C, 425°C, 450°C, 475°C, 500°C, 525°C, 550°C, 575°C or 600°C, or a value within the numerical range formed by any two of the above values, as long as the strengthened glass-ceramics with the required performance of the present application can be obtained. Preferably, the time t3 for chemical strengthening treatment is 1h to 48h, preferably t3 is 2h to 24h, and more preferably t3 is 2h to 15h. In some embodiments of the present application, the time t3 for chemical strengthening treatment can be 1h, 4h, 8h, 12h, 16h, 20h, 24h, 28h, 32h, 36h, 40h, 44h or 48h, or a value within the numerical range formed by any two of the above values, as long as the strengthened glass-ceramics with the required performance of the present application can be obtained. In some embodiments of the present application, a certain amount (such as 0wt% to 0.5wt%) of lithium salt can be added to the salt bath. By adopting the above chemical strengthening treatment process scheme, strengthening the glass-ceramics for chemical strengthening with a specific composition and structure can obtain strengthened glass-ceramics with excellent surface stress characteristics and excellent deep stress characteristics, thereby ensuring that the obtained strengthened glass-ceramics have high mechanical strength and excellent anti-damage performance. It should be understood that when performing chemical strengthening treatment, one-step chemical strengthening treatment can be carried out, or two-step or multi-step chemical strengthening treatment can be carried out. In the present application, the temperature of chemical strengthening treatment is the temperature of the salt bath; when the chemical strengthening treatment includes two steps or more, the time of chemical strengthening treatment is the sum of the time of each step of chemical strengthening treatment. In some embodiments of the present application, when the chemical strengthening treatment includes two steps or more, the temperature and time of each step of chemical strengthening treatment can be the same or different. In the present application, the stress distribution structure of the strengthened glass-ceramics is closely related to the composition of the glass-ceramics for chemical strengthening (including oxide composition and crystal phase composition), the composition of the salt bath, the temperature of the salt bath, and the time of chemical strengthening treatment. Only when the glass-ceramics for chemical strengthening with a specific composition are chemically strengthened for an appropriate time in a suitable salt bath (suitable composition and suitable temperature) can the prepared strengthened glass-ceramics obtain a specific stress distribution structure, thereby achieving the excellent effects expected in the present application. In this application, the strengthened glass-ceramics in any of the foregoing embodiments can be used to fabricate glass devices with high strength. For example, the glass devices can include, but are not limited to, worktops, other surfaces, appliance doors, floor tiles, wall panels, storage containers, mobile phone screens, mobile phone backs, electronic device frames, vehicle windshields, aircraft windshields, or marine vessel windshields, etc. The strengthened glass-ceramics provided in this application have high mechanical strength and high anti-damage performance, especially excellent anti-drop impact performance. Therefore, the glass devices provided in this application also have excellent mechanical properties. In this application, the strengthened glass-ceramics in any of the foregoing embodiments can be applied in electronic devices. In some embodiments of this application, the electronic device includes at least one of a mobile phone, a tablet computer, smart wearables, a display, and a television. For example, the electronic device can include, but is not limited to, a mobile phone, a tablet computer, smart wearables, a display, or a television, etc. Smart wearables can include, but are not limited to, electronic watches, smart bracelets, smart watches, smart glasses, etc. Displays can include, but are not limited to, high-definition displays, in-vehicle displays, on-board displays, etc. Exemplarily, the electronic device can include a housing and electronic components partially located within the housing. The housing includes a front surface, a rear surface, and side surfaces. The electronic components include a display device, which is located at or adjacent to the front surface of the housing. The strengthened glass-ceramics provided in this application can be applied to the front surface and / or the rear surface and / or the side surfaces of the housing. In some embodiments of this application, the front surface and / or the rear surface of the housing can be of equal thickness or unequal thickness. In some embodiments of this application, the front surface and / or the rear surface of the housing can be 2D, 2.5D, 3D, or irregular. Testing method: 1. X-ray diffraction (XRD) test Crush the sample to be tested and grind it into a sample with a particle size less than 75 μm. Use an X-ray diffractometer to test the ground sample to obtain the XRD diffraction peak curve and XRD diffraction data. Then use JADE Standard 8.6 software to analyze the XRD diffraction data to obtain the crystal phase of the sample. The X-ray diffractometer is Shimadzu XRD-6100, 2θ = 10° - 80°, the scanning speed is 6° / min, the working voltage is 40 kV, and the working current is 30 mA. Among them, the sample to be tested is the glass-ceramics for chemical strengthening or the strengthened glass-ceramics. Average crystal size: Based on the result data obtained from XRD testing, according to the Scherrer formula D = Kλ / (βcosθ), the average crystal size of the sample can be calculated. Here, λ is the X-ray wavelength, λ = 0.154056 nm, β is the full width at half maximum of the diffraction peak, K = 0.89, and θ is the Bragg diffraction angle. Specifically, the RAW file (diffraction pattern) output by the XRD instrument is curve-fitted in JADE Standard 8.6 software. Jade outputs a fitting report. According to the 2θ values and Peak FWHM values corresponding to each diffraction peak in the fitting report, and converting the Peak FWHM value to radian measure: β = (FWHM / 180×3.14), after calculating the crystal size of each diffraction peak through the Scherrer formula D = Kλ / (βcosθ) and averaging them, the average crystal size is obtained. Average crystal size of the (Zn,Mg)Al2O4 crystal phase: The RAW file (diffraction pattern) output by the XRD instrument is subjected to phase retrieval and curve fitting in JADE Standard 8.6 software. In the output fitting report, select the 2θ values and Peak FWHM values corresponding to the three diffraction peaks of the (Zn,Mg)Al2O4 crystal phase in the ranges of 2θ angles from 34° to 38°, from 44° to 46°, and from 64° to 67°. And convert the Peak FWHM value to radian measure: β = (FWHM / 180×3.14). After calculating the crystal size of the three diffraction peaks through the Scherrer formula D = Kλ / (βcosθ) and averaging them, the average crystal size of the (Zn,Mg)Al2O4 crystal phase is obtained. Here, λ is the X-ray wavelength, λ = 0.154056 nm, β is the full width at half maximum of the diffraction peak, K = 0.89, and θ is the Bragg diffraction angle. Crystal phase content: Import the XRD test results (RAW format) into JADE Standard 8.6 software for fitting and calculation, and the content of each crystal phase in the glass-ceramic can be obtained. Furthermore, the total content of each crystal phase in the glass-ceramic can be calculated. The ratio of the area of the fitted crystal phase peak to the area of all the fitted peaks is the crystal phase content of the corresponding crystal phase. The ratio of the area of the fitted crystal phase peak of the (Zn,Mg)Al2O4 crystal phase to the area of all the fitted peaks is the crystal phase content W of the (Zn,Mg)Al2O4 crystal phase; the ratio of the area of the fitted crystal phase peak of the tetragonal ZrO2 crystal phase to the area of all the fitted peaks is the crystal phase content W [(Zn，Mg)Al2O4] of the tetragonal ZrO2 crystal phase. According to W [ZrO2] and W [(Zn，Mg)Al2O4] and W [ZrO2] , the ratio (mass ratio Z) of the (Zn,Mg)Al2O4 crystal phase and the tetragonal ZrO2 crystal phase and the total crystal phase content W are calculated. Peak intensity ratio: Import the XRD test results (RAW format) into JADE Standard 8.6 software to find the peaks, determine the 2θ positions of the peaks and the corresponding original intensities, and calculate the peak intensity ratio. Specifically, it is the peak intensity ratio X of the first characteristic peak and the second characteristic peak. Full width at half maximum: Import the XRD test results (RAW format) into JADE Standard 8.6 software for phase retrieval and curve fitting. Obtain the 2θ positions of the peaks, the corresponding crystal planes, full width at half maximum, and fitting intensities in the output fitting report. Calculate the ratio according to the fitting intensities of the corresponding crystal planes. Specifically, it is the fitting peak intensity I of the characteristic peak of the

[0400] crystal plane

[0400] and the fitting peak intensity I of the characteristic peak of the

[0311] crystal plane

[0311] and the fitting peak intensity I of the characteristic peak of the

[0440] crystal plane

[0440] and the full width at half maximum W of the characteristic peak of the

[0400] crystal plane

[0400] and the full width at half maximum W of the characteristic peak of the

[0311] crystal plane

[0311] and the full width at half maximum W of the characteristic peak of the

[0440] crystal plane

[0440] and I

[0400] / I

[0311] and I

[0440] / I

[0311] . Considering that noise in the test process affects peak finding, the XRD diffraction peak curve can be smoothed no more than three times. 2. Tests of |CT_AV|, DOL_0, CS_50, ∣CT_CV∣ Use the stress meter SLP-2000 (or also called, scattered light photoelastic stress meter) for testing. The light source wavelength is 518 nm, SOC = 25.5 (nm / cm) / MPa, refractive index = 1.60, exposure time: 300 usec. When testing the surfaces of CS_50, |CT_AV|, DOL_0, |CT_CV|, it is necessary to first drop the conductive liquid on the stress meter, then wipe the sample of the strengthened glass ceramic to be tested clean, place it on the test path, and test its stress value. Among them, the stress meter is SLP-2000 and the conductive liquid used is the conductive liquid with a refractive index of 1.51. 3. Thickness test Use a micrometer to test the thickness of the glass ceramic for chemical strengthening. It should be understood that during chemical strengthening, in the thickness direction of the glass-ceramic for chemical strengthening, the degree of ion exchange changes in a gradient from the surface to the center, and the overall increase in the exchange amount (mass) of Na-K and / or Li-Na generally does not exceed 1% of the total mass of the sample. Therefore, the expansion effect in the thickness direction is extremely slight. That is to say, before and after chemical strengthening, the thickness change of the glass-ceramic for chemical strengthening is very small and can be approximately considered that the thickness basically remains unchanged. 4. Optical property testing The sample to be tested is cleaned in an ultrasonic cleaner. The cleaning conditions include: cleaning time: 10 min; cleaning agent used: dishwashing liquid diluted 10 times; cleaning temperature: 55 ± 10 °C; cleaning frequency: 30 ± 10 KHZ. Then, a haze meter is used to measure the transmittance of the sample to be tested at different wavelengths, and the test is carried out with reference to the standard of "GB / T 7962.12-2010 Test methods for colorless optical glass - Part 12: Spectral internal transmittance". The haze meter used in this application is the Konica Minolta spectrophotometer CM-3600A from Japan. Among them, the sample to be tested is the glass-ceramic for chemical strengthening or the strengthened glass-ceramic. 5. Testing of Vickers hardness HV Select the strengthened glass-ceramic with a clean surface without visible scratches, pits, cracks and other damages to the naked eye as the specimen. Use a digital display small load Vickers hardness tester VTD405 (Beijing WoWei Technology Co., Ltd.) to measure the Vickers hardness of the strengthened glass-ceramic according to the national standard GB / T 37900-2019 "Test methods for hardness and fracture toughness of ultra-thin glass - Small load Vickers hardness indentation method", with a load of 300 gf and a load time of 10 s. The effectiveness of the indentation meets the national standard GB / T 16534-2009 "Test methods for room temperature hardness of fine ceramics". When measuring the Vickers hardness in this application, the strengthened glass-ceramic sample with dimensions of 50 mm × 50 mm × 0.7 mm is tested. Three different positions are selected on the surface of the same specimen for measurement, and the average value is selected as the final test result. 6. Testing of the surface K2O concentration content In this application, the surface K2O concentration of the strengthened glass-ceramics is measured by an X-ray fluorescence spectrometer (XRF). The equipment model used is (Thermo Scientific ARL PERFORM’X), the target is Rh (rhodium), the tube voltage of the X-ray tube is 40 kW, the current is 60 mA, the collimator is 0.15, the crystal selected is LiF200, the detector selected is FPC, the test range is a 29-mm circle, and the analysis software is UniQuant non-standard analysis. Specifically, the content of K element on the surface of the strengthened glass-ceramics is measured by the X-ray fluorescence spectrometer (XRF), and then the surface K2O concentration is obtained by calculation. The calculation method is: surface K2O concentration = (content of K element on the surface × relative molecular mass of K2O) / (relative atomic mass of K element × 2). It should be understood that the content of K element on the surface = mass of K element / total mass of elements, and the total mass of elements = total mass of oxides. That is to say, the surface K2O concentration of the strengthened glass-ceramics is the ratio of the mass of K2O to the total mass of oxides. Among them, the oxides include oxides such as SiO2, Al2O3, ZrO2, Na2O, and K2O that can be accurately measured by XRF, and do not include the content of oxides such as B2O3 that cannot be accurately measured by XRF. When using XRF for testing, non-standard testing is used, and the concentrations of elements with atomic number 6 and below or their oxides in the strengthened glass-ceramics are not tested. That is, when XRF measures the surface K2O concentration of the strengthened glass-ceramics, the total mass of oxides measured does not include the mass of elements with atomic number 6 and below or their oxides in the strengthened glass-ceramics. 7. Test of average anti-sanding paper drop height The average anti-sanding paper drop height refers to: the sum of the anti-sanding paper drop heights measured for each sample among multiple samples of strengthened glass-ceramics in the same example or the same comparative example, divided by the number of strengthened glass-ceramics samples, which can be used to characterize the anti-drop damage performance of the strengthened glass-ceramics. For each batch, 10 identical strengthened glass-ceramics samples are taken for testing, and the average anti-sanding paper drop height is: where n is the number of strengthened glass-ceramics samples tested in each batch, and hi is the anti-sanding paper drop height measured for a single sample. Among them, the test method for the anti-sanding paper drop height of a single sample is: Step 1: Stick 80-mesh sandpaper on the lower surface of a 160-g model machine, and place this model machine on a Green Map LT-SKDL-CD type drop tester. Step 2: Place a strengthened glass-ceramic sample to be tested with a length, width, and thickness of 50 mm × 50 mm × 0.7 mm directly below the model machine, facing the sandpaper. Specifically, make the main surface of the strengthened glass-ceramic face the sandpaper. Let the model machine drop and impact the strengthened glass-ceramic sample directly below it from a certain drop height. If the strengthened glass-ceramic sample does not break, the drop height of the model machine is increased regularly. For example, starting from a drop height of 0.4 m, conduct a drop impact on the sample. If it does not break, increase the height by 0.1 m each time and drop again until the strengthened glass-ceramic sample breaks; Step 3: Record the previous drop height when the strengthened glass-ceramic sample breaks as the anti-sandpaper drop height. For example, if the drop height at the time of breaking is 0.5 m when the drop height is increased by 0.1 m each time, the anti-sandpaper drop height of the sample is 0.4 m. 8. Density In this application, an electronic density balance SD-200L from ALFA MIRAGE, Japan, is used to test the density of the strengthened glass-ceramic. The test principle is the "Archimedes drainage method". 9. Fracture Toughness Test The test is carried out according to the national standard GB / T 37900-2019 "Test Method for Hardness and Fracture Toughness of Ultra-Thin Glass - Small Load Vickers Hardness Indentation Method". Specifically, prepare indentations in the same way as for measuring Vickers hardness, measure the crack lengths 2C1 and 2C2 in the diagonal direction of the indentation, and the maximum value thereof shall not exceed the thickness of the strengthened glass-ceramic. Measure at least 5 effective indentation morphologies on the surface of at least one specimen and calculate their average value as the final result value of the specimen. Indentation fracture toughness calculation formula: where, IFR: indentation fracture toughness, unit is square root of megapascal meter (MPa·m 1 / 2) ; E: elastic modulus of the specimen, unit is gigapascal (GPa); 2C1, 2C2: crack propagation lengths in the diagonal direction of the indentation, unit is millimeter (mm), d1, d2 are: diagonal lengths of the indentation, unit is millimeter (mm), F: test load value, unit is newton (N). In the above test method, after shaping, cutting, and polishing the strengthened glass-ceramic bricks in the examples and comparative examples, strengthened glass-ceramic samples with desired dimensions (such as polished wafers) can be obtained, and then the tests are carried out, such as a glass-ceramic polished wafer with a length, width, and thickness of 50 mm × 50 mm × 0.7 mm. Example 1 <Preparation of Substrate Glass> According to the formulation 1 in Table 1, it is designed and converted into a raw material formulation for glass production for batching. The total mass of the configured raw materials is 1000 g, and then it is mixed in a V-type mixer for 30 min. After mixing evenly, 5 g of clarifying agent NaCl is added, and then it is transferred to a platinum crucible and melted in a 1650 °C lifting furnace (lifting furnace model: SJF1750, manufacturer: Nanjing Boyuntong Instrument Technology Co., Ltd.) for 5 h. Then it is poured into a preheated stainless steel mold at 300 °C for molding and cooling. It is cooled to 900 °C, and then put into an annealing furnace at 600 °C for annealing for 24 h, and then cooled to room temperature with the furnace to obtain the base glass. <Preparation of Glass Ceramics for Chemical Strengthening> The base glass prepared above is heat-treated in a resistance furnace (equipment model: SLX1400-40, manufacturer: Shanghai Shengli Testing Instrument Co., Ltd.) to obtain glass ceramics for chemical strengthening. In terms of the molar percentage of oxides, the composition of the prepared glass ceramics for chemical strengthening is the same as that of the base glass, as shown in Table 1 for details. Specifically, a two-step heat treatment process is adopted. First, it is heated to the nucleation treatment temperature for nucleation treatment, and then it is heated to the crystallization treatment temperature for crystallization treatment; the heating rate during nucleation treatment and crystallization is 10 K / min. Among them, the nucleation treatment temperature T1 is 740 °C, and the nucleation treatment time t1 is 480 min; the crystallization treatment temperature T2 is 800 °C, and the crystallization treatment time t2 is 10 min. According to needs, after the glass ceramics for chemical strengthening are successively cut, CNC processed (computer numerical control, that is, a numerically controlled machine tool, and the CNC instrument and equipment model used in this application is: RCG500S), and polished, smooth glass ceramic sheets of the required specifications are obtained. In this application, the specifications of the processed glass ceramic sheets for chemical strengthening are samples with a length, width, and thickness of 50 mm × 50 mm × 0.7 mm. <Preparation of Strengthened Glass Ceramics> The glass ceramics for chemical strengthening are placed in a 100 wt% NaNO3 salt bath at 450 °C for the first-step strengthening treatment for 3 h, and then placed in a 100 wt% KNO3 salt bath at 430 °C for the second-step strengthening treatment for 2 h to obtain strengthened glass ceramics. Examples 2 to 8 Except for adjusting the relevant preparation parameters according to Table 2, the rest are the same as in Example 1. Among them, the corresponding formulations in Table 2 are shown in Table 1 for details. Examples 9 to 10 Except for placing the corresponding glass ceramics for chemical strengthening in a 100 wt% NaNO3 salt bath at 450 °C for 4 h to obtain the corresponding strengthened glass ceramics according to Table 5, the rest are the same as in Example 1. Comparative Example 1 to Comparative Example 11 Except for adjusting the relevant preparation parameters according to Table 2, the rest was the same as in Example 1. Among them, the corresponding formulations in Table 2 are shown in detail in Table 1. Comparative Example 12 to Comparative Example 15 Except for placing the corresponding chemically strengthened glass-ceramics in a 100 wt% NaNO3 salt bath at 450 °C for 4 h according to Table 5 to obtain the corresponding strengthened glass-ceramics, the rest was the same as in Example 1. The formulations of each example and comparative example are shown in Table 1, and the preparation parameters and performance tests of each example and comparative example are shown in Tables 2 to 5. After testing, the chemically strengthened glass-ceramics of Examples 1 to 8 and Comparative Examples 1 to 11 all contain the main crystal phase (Zn, Mg)Al2O4 crystal phase and the secondary crystal phase tetragonal ZrO2 crystal phase. The XRD patterns of some examples and comparative examples are shown in Figures 2 to 6 and Figure 8. Referring to Tables 1 to 4, both DOL_0 and |CT-AV| of the strengthened glass-ceramics of Examples 1 to 8 are within the scope of this application, while at least one of DOL_0 and |CT-AV| in Comparative Examples 1 to 11 is not within the scope of this application. The strengthened glass-ceramics in the examples of this application simultaneously have a high Vickers hardness, fracture toughness, and a higher average anti-sanding-paper drop height, indicating that the strengthened glass-ceramics obtained in the examples of this application have higher mechanical strength. At the same time, the light transmittance of the chemically strengthened glass-ceramics in the examples at a wavelength of 550 nm is above 89.00%, so that the obtained strengthened glass-ceramics also have excellent light transmittance. Specifically, as shown in Figure 7, the light transmittance of the chemically strengthened glass-ceramics in Example 1 to visible light is above 80.00%, so that the obtained strengthened glass-ceramics are transparent in the visible light range. Examples 1 to 2 and Comparative Examples 6 to 9 are all obtained by different heat treatment systems on the substrate glass with the composition of Formulation 1 to obtain chemically strengthened glass-ceramics, and their XRD diffraction patterns are shown in Figure 2. Referring to FIGS. 2 and 3, there is no second characteristic peak in the XRD pattern of Comparative Example 6 within the range of 2θ angles from 36° to 38°. Therefore, there is no peak intensity ratio X. The content of the (Zn, Mg)Al2O4 crystal phase in the glass-ceramic for chemical strengthening in Comparative Example 6 is relatively low, and the calculation result of Formula C does not meet the scope of the present application. The stress level of the strengthened glass-ceramic prepared in Comparative Example 6 is relatively low. Referring to FIGS. 2 and 3, the peak intensity ratio X of the XRD pattern of Comparative Example 7 is 1.61. The content of the (Zn, Mg)Al2O4 crystal phase in the glass-ceramic for chemical strengthening in Comparative Example 7 is relatively low, and the full width at half maximum of some crystal plane characteristic peaks does not meet the requirements of the present application. The calculation result of Formula C also does not meet the scope of the present application. The stress level of the strengthened glass-ceramic prepared in Comparative Example 7 is also relatively low. Referring to FIGS. 2 and 3, in the XRD pattern of Comparative Example 8, split peaks appear within the range of 2θ angles from 28° to 32°. The content of the (Zn, Mg)Al2O4 crystal phase in the glass-ceramic for chemical strengthening in Comparative Example 8 is relatively high, the average crystal size of the (Zn, Mg)Al2O4 crystal phase is relatively high, and the full width at half maximum of the crystal plane characteristic peaks does not meet the requirements of the present application. The calculation result of Formula C also does not meet the scope of the present application. The stress level of the strengthened glass-ceramic prepared in Comparative Example 8 is relatively low. Referring to FIG. 2, in the XRD pattern of Comparative Example 9, split peaks appear within the range of 2θ angles from 28° to 32°. In the glass-ceramic for chemical strengthening in Comparative Example 9, the content of the (Zn, Mg)Al2O4 crystal phase is also relatively high, and the average crystal size of the (Zn, Mg)Al2O4 crystal phase is also relatively high. The calculation result of Formula C also does not meet the scope of the present application. The stress level of the strengthened glass-ceramic prepared in Comparative Example 9 is also relatively low. For Comparative Example 10 and Comparative Example 11, chemically strengthened glass-ceramics were obtained by different heat treatment systems on the substrate glass with the composition of Formulation 5, and their XRD diffraction patterns are shown in FIGS. 5 and 6. As shown in FIG. 5, in the XRD pattern of Comparative Example 10, split peaks appear within the ranges of 2θ angles from 28° to 32° and from 36° to 38°. In the glass-ceramic for chemical strengthening in Comparative Example 10, the average crystal size of the (Zn, Mg)Al2O4 crystal phase is relatively high, and the calculation result of Formula C does not meet the scope of the present application. The stress level of the strengthened glass-ceramic prepared in Comparative Example 10 is relatively low. As shown in FIG. 6, in the XRD pattern of Comparative Example 11, split peaks appear within the range of 2θ angles from 28° to 32°. In the glass-ceramic for chemical strengthening in Comparative Example 11, the average crystal size of the (Zn, Mg)Al2O4 crystal phase is relatively high, the full width at half maximum of some crystal plane characteristic peaks does not meet the requirements of the present application, the peak intensity ratio X does not meet the scope of the present application, the calculation result of Formula C also does not meet the scope of the present application, and the stress level of the strengthened glass-ceramic prepared in Comparative Example 11 is relatively low. Comparative Examples 12 to 15 and Examples 9 to 10 obtained glass ceramics for chemical strengthening by different heat treatment systems on the substrate glass with the composition of Formula 1, and the strengthened glass ceramics obtained under the same chemical strengthening treatment conditions. The depths of the compressive stress layer DOL-0 of Comparative Examples 12 to 15 were not within the scope of this application, and their anti-drop impact performance was worse than that of the examples of this application. It should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Each embodiment in this specification is described in a related manner. For the same or similar parts between the embodiments, reference can be made to each other. The key points of each embodiment are the differences from other embodiments. The above are only the preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the scope of protection of this application.

Claims

1. A strengthened glass-ceramic, characterized in that, The strengthened glass-ceramic contains a main crystal phase of (Zn, Mg)Al₂O₄ crystal phase and a secondary crystal phase of tetragonal ZrO₂ crystal phase; the strengthened glass-ceramic contains a compressive stress layer region extending from the surface of the strengthened glass-ceramic to the compressive depth and has a tensile stress layer region inside; the depth of the compressive stress layer DOL_0 of the strengthened glass-ceramic is ≥0.21t, preferably, 0.21t ≤ DOL_0 ≤ 0.25t, where t is the thickness of the strengthened glass-ceramic; the ∣CT_AV∣ of the strengthened glass-ceramic is ≥70 MPa, preferably, 70 MPa ≤ ∣CT_AV∣ ≤ 110 MPa.

2. The strengthened glass-ceramics according to claim 1, wherein Calculated based on the mass of the strengthened glass-ceramic, the total content of the (Zn, Mg)Al₂O₄ crystal phase and the tetragonal ZrO₂ crystal phase is 25.00 wt% to 70.00 wt%, preferably 30.00 wt% to 50.00 wt%, and the ratio of the (Zn, Mg)Al₂O₄ crystal phase to the tetragonal ZrO₂ crystal phase is 1.00 to 18.00, preferably 1.00 to 15.00; and / or, in the strengthened glass-ceramic, the average crystal size of the (Zn, Mg)Al₂O₄ crystal phase is 3.0 nm to 10.0 nm, preferably 4.0 nm to 7.5 nm, more preferably 4.5 nm to 7.5 nm; and / or, the strengthened glass-ceramic is transparent in the visible light range.

3. The toughened glass-ceramics according to claim 1 or 2, characterized in that, In terms of mole percentage of oxides, the composition at the center of the strengthened glass-ceramic includes: SiO₂ 35.00 mol% to 60.00 mol%, Al₂O₃ 20.00 mol% to 40.00 mol%, ZrO₂ 2.00 mol% to 8.00 mol%, MgO 3.00 mol% to 7.50 mol%, ZnO 7.00 mol% to 13.00 mol%, Na₂O 1.00 mol% to 10.00 mol%, Li₂O 2.50 mol% to 10.00 mol%.

4. The toughened glass-ceramics according to any one of claims 1 to 3, characterized in that The strengthened glass-ceramic contains 15.00 wt% to 45.00 wt% of the (Zn, Mg)Al₂O₄ crystal phase in the strengthened glass-ceramic.

5. The toughened glass-ceramic according to any one of claims 1 to 4, characterized in that, Take W [(Zn，Mg)Al2O4] is the weight percentage of the (Zn, Mg)Al2O4 crystal phase in the strengthened glass-ceramics, W [Al2O3] is the weight percentage of Al2O3 in the strengthened glass-ceramics, W [MgO] is the weight percentage of MgO in the strengthened glass-ceramics, W [ZnO] is the weight percentage of ZnO in the strengthened glass-ceramics, A = (1 - W [(Zn，Mg)Al2O4] / 2) × W [Al2O3] / 2, B = (1 - W [(Zn，Mg)Al2O4] ) × (W [MgO] + W [ZnO] ), C = A / B, in the strengthened glass-ceramics, 1.50 ≤ C ≤ 1.

85.

6. The toughened glass ceramic according to any one of claims 1 to 5, characterized in that, The value of A is 10.00% to 25.00%, preferably 14.00% to 25.00%; and / or, The value of B is 7.50% to 12.50%, preferably 8.00% to 12.00%.

7. The toughened glass ceramic according to any one of claims 1 to 6, characterized in that, The CS_50 of the strengthened glass-ceramic is ≥100 MPa, preferably, 100 MPa ≤ CS_50 ≤ 250 MPa.

8. The strengthened glass ceramic according to any one of claims 1 to 7, characterized in that, The Vickers hardness of the strengthened glass-ceramics is greater than or equal to 790 kgf / mm 2 , preferably 790 kgf / mm 2 ~1000 kgf / mm 2 .

9. The toughened glass ceramic according to any one of claims 1 to 8, characterized in that, The fracture toughness of the strengthened glass-ceramics is greater than or equal to 1.00 MPa·m 1 / 2 , preferably greater than or equal to 1.20 MPa·m 1 / 2 , more preferably greater than or equal to 1.55 MPa·m 1 / 2 .

10. The toughened glass-ceramics according to any one of claims 1 to 9, characterized in that, The ∣CT_CV∣ of the strengthened glass-ceramic is ≥80 MPa, preferably, 80 MPa ≤ ∣CT_CV∣ ≤ 150 MPa.

11. The strengthened glass ceramic according to any one of claims 1 to 10, characterized in that, In the X-ray diffraction pattern of the strengthened glass-ceramic, the peak with the maximum peak intensity among the characteristic peaks in the range of 2θ angles from 28° to 32° is taken as the first characteristic peak, and the peak with the maximum peak intensity among the characteristic peaks in the range of 2θ angles from 36° to 38° is taken as the second characteristic peak. The peak intensity ratio X of the first characteristic peak to the second characteristic peak is 0.80 to 1.50, and preferably the peak intensity ratio X is 0.85 to 1.

30.

12. The toughened glass-ceramics according to any one of claims 1 to 11, characterized in that, In the X-ray diffraction pattern of the strengthened glass-ceramic, the characteristic peak of the [400] crystal plane of the (Zn, Mg)Al2O4 crystal phase is located in the range of 2θ angles from 44° to 46°, the characteristic peak of the [311] crystal plane of the (Zn, Mg)Al2O4 crystal phase is located in the range of 2θ angles from 34° to 38°, and the characteristic peak of the [440] crystal plane of the (Zn, Mg)Al2O4 crystal phase is located in the range of 2θ angles from 64° to 67°. The full width at half maximum W of the [400] crystal plane characteristic peak [400] is 0.650° to 1.800°, preferably W [400] is 0.900° to 1.600°; The full width at half maximum W of the [311] crystal plane characteristic peak [311] is 0.900° to 2.800°, preferably W [311] is 1.100° to 2.230°; The full width at half maximum W of the [440] crystal plane characteristic peak [440] is 0.750° to 2.000°, preferably W [440] is 0.900° to 1.600°.

13. The toughened glass-ceramics according to any one of claims 1 to 12, characterized in that, In terms of the molar percentage of oxides, the composition at the center of the strengthened glass-ceramic further includes: K2O 0.00 mol% to 5.00 mol%, CaO 0.00 mol% to 10.00 mol%, B2O3 0.00 mol% to 10.00 mol%, BaO 0.00 mol% to 5.00 mol%.

14. The toughened glass ceramic according to any one of claims 1 to 13, characterized in that, In terms of the molar percentage of oxides, the composition at the center of the strengthened glass-ceramic includes: SiO2 35.00 mol% to 60.00 mol%, Al2O3 20.00 mol% to 40.00 mol%, ZrO2 2.00 mol% to 8.00 mol%, MgO 4.00 mol% to 7.00 mol%, ZnO 9.00 mol% to 12.00 mol%, Na2O 2.00 mol% to 10.00 mol%, Li2O 3.00 mol% to 10.00 mol%.

15. The toughened glass-ceramics according to any one of claims 1 to 14, characterized in that, In terms of the molar percentage of oxides, the composition at the center of the strengthened glass-ceramic includes: SiO2 35.00 mol% to 50.00 mol%, Al2O3 25.00 mol% to 35.00 mol%, ZrO2 3.00 mol% to 5.00 mol%, MgO 4.00 mol% to 7.00 mol%, ZnO 9.00 mol% to 12.00 mol%, Na2O 2.00 mol% to 10.00 mol%, Li2O 3.00 mol% to 10.00 mol%.

16. The strengthened glass-ceramics according to any one of claims 1 to 15, characterized in that, In terms of the molar percentage of each oxide in the composition of the strengthened glass-ceramic, the composition at the center of the strengthened glass-ceramic satisfies: 1.30 ≤ ZnO / MgO ≤ 2.50; and / or, 0.05 ≤ Li2O / (Al2O3 - (MgO + ZnO) + SiO2) ≤ 0.20; and / or, 0.19 ≤ (Al2O3 - (MgO + ZnO)) / SiO2 ≤ 0.60; and / or, 0.26 ≤ Na2O / Li2O ≤ 3.

00.

17. The strengthened glass-ceramics according to any one of claims 1 to 16, characterized in that, In terms of the molar percentages of the respective oxides in the composition of the strengthened glass-ceramics, the composition at the center of the strengthened glass-ceramics further satisfies: 12.00 mol% ≤ ZnO + MgO ≤ 20.00 mol%, preferably, 13.00 mol% ≤ ZnO + MgO ≤ 17.30 mol%; and / or, 9.00 mol% ≤ Al2O3 - (MgO + ZnO) ≤ 22.00 mol%, preferably, 10.00 mol% ≤ Al2O3 - (MgO + ZnO) ≤ 20.00 mol%; and / or, 5.00 mol% ≤ Na2O + Li2O ≤ 15.00 mol%, preferably, 6.00 mol% ≤ Na2O + Li2O ≤ 13.50 mol%.

18. The strengthened glass-ceramics according to any one of claims 1 to 17, characterized in that, The transmittance of the strengthened glass-ceramics with a thickness of 0.7 mm under light with a wavelength of 550 nm is greater than or equal to 85.00%.

19. The toughened glass-ceramics according to any one of claims 1 to 18, characterized in that, For the strengthened glass-ceramics with a thickness of 0.7 mm, a drop resistance test is carried out using 80-mesh sandpaper, and the average sandpaper drop height of the strengthened glass-ceramics is greater than or equal to 1.00 m, preferably the average sandpaper drop height is greater than or equal to 1.40 m, and more preferably it is 1.50 m to 2.50 m.

20. The strengthened glass ceramic according to any one of claims 1 to 19, characterized in that, The strengthened glass-ceramics are obtained by chemically strengthening glass-ceramics for chemical strengthening, and the composition of the glass-ceramics for chemical strengthening is the same as the composition at the center of the strengthened glass-ceramics.

21. A glass device, which is made of the strengthened glass-ceramics according to any one of claims 1 to 20.

22. An electronic device, which includes the strengthened glass-ceramics according to any one of claims 1 to 20.

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