Chemically strengthened glass ceramic, cover-plate glass, electronic device and glass apparatus

Abstract

The present application belongs to the technical field of glass ceramics, and provides chemically strengthened glass ceramic, cover-plate glass, an electronic device and a glass apparatus. In the present application, by making the chemically strengthened glass ceramic satisfy a specific crystal phase structure, and also making the thickness and the stress structure of the chemically strengthened glass ceramic satisfy specific requirements, the synergistic cooperation between the thickness, the crystal phase structure and the stress structure is better achieved, and the anti-damage performance of the chemically strengthened glass ceramic can be better improved, such that the high-strength performance requirement for chemically strengthened glass ceramic having different thicknesses can be maintained, and it can be ensured that the chemically strengthened glass ceramic having different thicknesses has both excellent resistance to penetration by sharp objects and excellent resistance to drop damage from rough surfaces.

Description

Chemically strengthened glass-ceramics, cover glass, electronic device and glass article

[0001] Cross Reference to Related Applications

[0002] This application claims priority to the Chinese patent application entitled “Chemically strengthened glass-ceramics, cover glass, electronic device and glass article” filed on April 11, 2024 with the China National Intellectual Property Office, having the application number 202410436179.9, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of glass-ceramics, and in particular to a chemically strengthened glass-ceramics, cover glass, electronic device and glass article. BACKGROUND

[0004] With the popularity of electronic products, electronic devices such as mobile phones, watches, and tablets have become an essential part of daily life, and the damage resistance of the cover glass of the electronic device screen has become one of the hot issues of market concern. In order to improve the damage resistance of the cover glass, the cover industry has successively launched chemically strengthened glass-ceramics which generally have better performance than ordinary glass.

[0005] However, in different electronic devices, there are different requirements for the thickness of the cover glass, and the change in thickness will cause the mechanical properties of the chemically strengthened glass-ceramics to change as well. Some chemically strengthened glass-ceramics even have a cliff-like drop in performance after the thickness is thinned, making it difficult to meet the market demand for large screens and thin and light electronic devices.

[0006] Currently, common situations of surface cracking or surface damage of electronic device cover glass include collision of objects with sharp protrusions on the surface of the cover glass, penetration or puncture of the cover glass, and dropping of the electronic device on rough ground, causing the cover glass to crack or break due to impact. For example, when an electronic device (such as a mobile phone, tablet, etc.) accidentally falls on a road surface with gravel or sharp protrusions or an asphalt road surface, the cover glass used for the screen of the electronic device is very likely to collide with sharp protrusions and / or be penetrated or punctured by sharp protrusions, which not only directly affects the appearance of the screen of the electronic device, but also affects its normal use.

[0007] Therefore, in order to reduce the probability of surface damage and breakage of the cover glass of the screen of the electronic device caused by impact of sharp objects, and thus ensure the safe and stable operation of the electronic device, it is necessary to provide a chemically strengthened glass-ceramics that can always maintain excellent resistance to penetration by sharp objects and excellent resistance to damage caused by falling on rough surfaces at different thicknesses.

[0008] It should be noted that the contents of this part of the present application only provide background of the present application, and do not necessarily constitute prior art or known art. SUMMARY

[0009] The present application provides a kind of chemical strengthening glass-ceramics capable of being realized at different thickness, keep high mechanical strength performance, excellent ability of anti-penetration of sharp object, excellent ability of anti-damage of rough surface drop, and cover glass, electronic equipment and glass device comprising the chemical strengthening glass-ceramics.

[0010] In a first aspect, a chemical strengthening glass-ceramic is provided, the chemical strengthening glass-ceramic comprising petalite crystal phase and lithium disilicate crystal phase, wherein the petalite crystal phase and the lithium disilicate crystal phase have a higher mass percentage than other crystal phases present in the chemical strengthening glass-ceramic.

[0011] The chemical strengthening glass-ceramic has a compressive stress layer on the surface and a tensile stress in the interior; the chemical strengthening glass-ceramic satisfies:

[0012] 90 μm ≤ DOL_0;

[0013] A is 5-15;

[0014] wherein: T is the thickness of the chemical strengthening glass-ceramic, in mm; t is the depth from the main surface of the chemical strengthening glass-ceramic, CS(t) is the compressive stress value at the depth of t, is the compressive stress integral of the chemical strengthening glass-ceramic from any main surface to the compressive stress layer at a depth of 80 μm from the main surface, in MPa·μm; in formula A, the data is substituted into the calculation according to the above unit requirements, and the calculation result is obtained, and the unit is not involved in the calculation. By making the chemical strengthening glass-ceramic satisfy the specific crystal phase structure and the requirements of formula A, the thickness, crystal phase structure and stress structure are better coordinated to improve the damage resistance of the chemical strengthening glass-ceramic, especially to ensure that the chemical strengthening glass-ceramic product has excellent anti-penetration of sharp object and excellent anti-damage performance of rough surface drop. In addition, the chemical strengthening glass-ceramic of the present application also has excellent anti-penetration of sharp object and excellent anti-damage performance of rough surface drop even when the thickness is thin, which can reduce the probability of damage to the screen of the electronic equipment, ensure the beauty of the screen, and further meet the market demand for large screen and thin and light electronic equipment.

[0015] As an optional embodiment, the chemical strengthening glass-ceramic satisfies: B = |CT_AV| × DOL_0 × (1000 × T 2.8 -2 × DOL_0 × T1.8 B is 550-3500;

[0016] wherein, T is the thickness of the chemically strengthened microcrystalline glass, in mm; |CT_AV| is the absolute value of the average tensile stress, in MPa; DOL_0 is the depth of compressive stress layer, in μm; in formula B, the data is substituted into the formula according to the above unit requirements, and the calculation result is obtained, and the unit is not involved in the calculation. By making the thickness and stress of the chemically strengthened microcrystalline glass satisfy a specific relationship, the damage resistance of the chemically strengthened microcrystalline glass is improved.

[0017] As an optional embodiment, the thickness T of the chemically strengthened microcrystalline glass is ≤1 mm, preferably, the thickness T of the chemically strengthened microcrystalline glass is 0.30-1 mm, more preferably, the thickness T of the chemically strengthened microcrystalline glass is 0.35-0.7 mm. Electronic devices tend to be light and thin, and when the thickness is too large, on the one hand, the weight is increased, and on the other hand, the optical effect is poor, which is not conducive to achieving high transparency.

[0018] As an optional embodiment, the chemically strengthened microcrystalline glass satisfies:

[0019] Preferably,

[0020] More preferably,

[0021] The greater the area surrounded by the compressive stress curve, the straight line y=0, the straight line x=0 and the straight line x=80 μm, the greater the stress intensity value in the range of 0 μm and 80 μm of the depth of compressive stress layer, and the better the surface stress level, which is conducive to ensuring that the chemically strengthened microcrystalline glass has excellent sharp object penetration resistance and rough surface drop damage resistance.

[0022] As an optional embodiment, the chemically strengthened microcrystalline glass satisfies:

[0023] 70 MPa≤|CT_AV|≤160 MPa, preferably, 77 MPa≤|CT_AV|≤160 MPa, more preferably, 110 MPa≤|CT_AV|≤150 MPa, wherein |CT_AV| is the absolute value of the average tensile stress; and / or,

[0024] 0.17≤DOL_0 / T≤0.25, preferably, 0.18≤DOL_0 / T≤0.25; and / or,

[0025] 50000 MPa / mm ≤ CT LD ≤ 80000 MPa / mm, preferably 55000 MPa / mm ≤ CT LD ≤ 80000 MPa / mm, more preferably 61000 MPa / mm ≤ CT LD ≤ 75000 MPa / mm, wherein CT LD is the tensile stress linear density; and / or,

[0026] 90 pm ≤ DOL 0, preferably 90 pm ≤ DOL 0 ≤ 200 pm, more preferably 95 pm ≤ DOL 0 ≤ 150 pm, wherein DOL 0 is the depth of compressive stress layer; by making the chemically strengthened glass-ceramics satisfy the suitable stress structure, it is conducive to obtain the chemically strengthened glass-ceramic product with higher stress level, and further conducive to play the improvement effect of the stress structure on the mechanical strength performance, to ensure that the chemically strengthened glass-ceramics satisfy excellent damage resistance performance.

[0027] As an optional embodiment, the chemically strengthened glass-ceramics satisfy:

[0028] T has a value of 0.475 mm, 0.505 mm, 0.545 mm, 0.590 mm, 0.620 mm, 0.650 mm, 0.500 mm or 0.400 mm; and / or,

[0029] A has a value of 7.635, 5.809, 9.060, 5.907, 5.426, 7.067, 6.609, 9.628, 5.999, 9.782, 6.541, 12.510, 6.503, 5.806 or 5.430; and / or,

[0030] B has a value of 955.0, 877.3, 1175.9, 1043.3, 1209.0, 1320.5, 1398.7, 1989.5, 1621.4, 2339.9, 1729.7, 2879.3, 995.6, 895.9 or 562.9; and / or,

[0031] has a value of 23322.83 MPa pm, 17745.62 MPa pm, 25245.12 MPa pm, 16459.20 MPa pm, 13485.35 MPa pm, 17564.52 MPa pm, 14582.65 MPa pm, 21245.19 MPa pm, 12287.36 MPa pm, 20036.85 MPa pm, 12482.65 MPa pm, 23872.85 MPa pm, 18393.52 MPa pm, 16421.45 MPa pm or 21464.39 MPa pm; and / or,

[0032] DOL_0 has a value of 111.48 pm, 110.32 pm, 113.85 pm, 114.65 pm, 113.82 pm, 124.84 pm, 116.25 pm, 129.90 pm, 114.26 pm, 136.58 pm, 115.54 pm, 144.85 pm, 109.58 pm, 108.86 pm, or 98.00 pm; and / or,

[0033] |CT_AV| has a value of 129.8 MPa, 119.4 MPa, 127.4 MPa, 112.9 MPa, 99.8 MPa, 106.8 MPa, 87.0 MPa, 119.9 MPa, 85.7 MPa, 116.8 MPa, 77.6 MPa, 119.8 MPa, 112.66 MPa, 101.5 MPa, or 146.5 MPa; and / or,

[0034] DOL_0 / T has a value of 0.25, 0.23, 0.21, 0.20, 0.22, 0.19, or 0.18; and / or,

[0035] CT_LD has a value of 68873.25 MPa / mm, 63938.07 MPa / mm, 69956.48 MPa / mm, 61636.69 MPa / mm, 58114.73 MPa / mm, 57871.88 MPa / mm, 52716.10 MPa / mm, 67103.36 MPa / mm, 54112.64 MPa / mm, 65328.99 MPa / mm, 50012.60 MPa / mm, 66406.06 MPa / mm, 63278.87 MPa / mm, 57316.32 MPa / mm, or 74715.00 MPa / mm.

[0036] As an optional embodiment, in the composition of the center or the compressive stress layer of the chemically strengthened glass-ceramics, in mole percent of oxides, comprises:

[0037] SiO2: 64% to 70%, Al2O3: 3.5% to 5.0%, P2O5: 0.7% to 1.5%, ZrO2: 1.5% to 3%, Na2O: 0 to 3%, K2O: 0 to 1%, Li2O: 20% to 26%, CaO: 0 ～ 1.5%, B2O3: 0 to 2%. By satisfying the specific glass composition, it is beneficial to obtain the glass-ceramics satisfying the specific crystal phase structure, and it is beneficial to obtain the chemically strengthened glass-ceramics satisfying the specific stress structure.

[0038] As an optional embodiment, the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer comprises, in mole percent of oxides:

[0039] SiO2in a mole percent of 64% to 69.5%, preferably, SiO2in a mole percent of 67.5% to 69.5%; and / or,

[0040] Al2O3in a mole percent of 4% to 4.8%, preferably, Al2O3in a mole percent of 4% to 4.5%; and / or,

[0041] P2O5in a mole percent of 0.8% to 1.5%, preferably, P2O5in a mole percent of 0.8% to 1.2%; and / or,

[0042] ZrO2in a mole percent of 2.5% to 3%, preferably, ZrO2in a mole percent of 2.6% to 3%; and / or,

[0043] Na2O in a mole percent of 0 to 2%, preferably, Na2O in a mole percent of 0 to 1%; and / or,

[0044] K2O in a mole percent of 0 to 0.5%, preferably, K2O in a mole percent of 0 to 0.3%; and / or,

[0045] Li2O in a mole percent of 20.5% to 25%, preferably, Li2O in a mole percent of 20.5% to 23.5%; and / or,

[0046] CaO in a mole percent of 0% to 1%, preferably, CaO in a mole percent of 0.5% to 1%; and / or,

[0047] B2O3in a mole percent of 0 to 1%, preferably, B2O3in a mole percent of 0% to 0.8%.

[0048] As an optional embodiment, the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer comprises, in mole percent of oxides:

[0049] SiO2in a mole percent of 68.02%, 64.39% or 68.74%; and / or,

[0050] Al2O3in a mole percent of 4.30%, 4.07% or 4.41%; and / or,

[0051] P2O5in a mole percent of 1.17%, 1.14% or 0.95%; and / or,

[0052] the molar percentage of ZrO2 is 2.88%, 2.98% or 2.89%; and / or,

[0053] the molar percentage of Na2O is 0.15%, 0.78% or 0%; and / or,

[0054] the molar percentage of K2O is 0.07% or 0%; and / or,

[0055] the molar percentage of Li2O is 22.40%, 25.68% or 21.48%; and / or,

[0056] the molar percentage of CaO is 0.89%, 0.93% or 0.73%; and / or,

[0057] the molar percentage of B2O3 is 0.08%, 0.8% or 0%.

[0058] As an alternative embodiment, in the composition of the center of the chemically strengthened glass-ceramic or of the compressive stress layer, the molar percentage of ZrO2 [ZrO2], the molar percentage of CaO [CaO], the molar percentage of P2O5 [P2O5], the molar percentage of Na2O [Na2O], the molar percentage of K2O [K2O], the molar percentage of B2O3 [B2O3], the molar percentage of Al2O3 [Al2O3] and the molar percentage of SiO2 [SiO2] satisfy the following relationships:

[0059] 3.5%≤ ([ZrO2] + [CaO] + [P2O5]) / EXP ([Na2O] + [K2O] + [B2O3]) ≤ 5.5%, preferably 4.5%≤ ([ZrO2] + [CaO] + [P2O5]) / EXP ([Na2O] + [K2O] + [B2O3]) ≤ 5%; and / or,

[0060] 5%≤ [P2O5] + [Al2O3] ≤ 6%, preferably 5.2%≤ [P2O5] + [Al2O3] ≤ 5.5%; and / or,

[0061] 15≤ ([SiO2] + 2 x [B2O3]) / [Al2O3] ≤ 17, preferably 15≤ ([SiO2] + 2 x [B2O3]) / [Al2O3] ≤ 16.5.

[0062] As an optional embodiment, the molar percentage of ZrO2 [ZrO2], the molar percentage of CaO [CaO], the molar percentage of P2O5 [P2O5], the molar percentage of Na2O [Na2O], the molar percentage of K2O [K2O], the molar percentage of B2O3 [B2O3], the molar percentage of Al2O3 [Al2O3] and the molar percentage of SiO2 [SiO2] in the composition of the center of the chemically strengthened glass-ceramics or the tensile stress layer satisfy the following relationships:

[0063] ([ZrO2]+[CaO]+[P2O5]) / EXP([Na2O]+[K2O]+[B2O3]) is 4.97% or 4.53%; and / or,

[0064] [P2O5]+[Al2O3] is 5.21%, 5.47% or 5.36%; and / or

[0065] ([SiO2]+2×[B2O3]) / [Al2O3] is 15.86, 15.82 or 15.95.

[0066] As an optional embodiment, the sum of the mass of the eucryptite crystal phase and the lithium disilicate crystal phase accounts for more than 80wt% of all the crystal phases of the chemically strengthened glass-ceramics,

[0067] Preferably, the sum of the mass of the eucryptite crystal phase and the lithium disilicate crystal phase accounts for 85wt% to 100wt% of all the crystal phases of the chemically strengthened glass-ceramics.

[0068] As an optional embodiment, the average grain size of the chemically strengthened glass-ceramics is not more than 100nm, preferably, the average grain size is not more than 50nm, more preferably, the average grain size is 15nm to 30nm; and / or

[0069] The crystallinity of the chemically strengthened glass-ceramics is not less than 70%, preferably, the crystallinity of the chemically strengthened glass-ceramics is 80% to 90%, more preferably, the crystallinity of the chemically strengthened glass-ceramics is 85% to 90%.

[0070] As an optional embodiment, the Young's modulus of the chemically strengthened glass-ceramics is greater than 100GPa, preferably, the Young's modulus is greater than 105GPa, more preferably, the Young's modulus is 110GPa to 120GPa.

[0071] As an optional embodiment, the b value of the chemically strengthened glass-ceramics is <1.0 when the thickness is 0.30mm to 1mm, preferably, the b value is <0.70, more preferably, the b value is ≤0.60; and / or,

[0072] The chemically strengthened glass-ceramic is transparent in the visible wavelength range, preferably has a transmittance of ≥ 85%, preferably ≥ 90.00%, more preferably ≥ 90.29% for a 0.3 mm to 1 mm thick chemically strengthened glass-ceramic for a 550 nm wavelength light.

[0073] As an optional embodiment, the absolute value of the slope at a depth of 80 μm on the compressive stress profile of the chemically strengthened glass-ceramic is |K 80μm satisfies 2.5 MPa / μm ≤ |K 80μm ≤ 4.5 MPa / μm, preferably 3.0 MPa / μm ≤ |K 80μm ≤ 4.5 MPa / μm.

[0074] As an optional embodiment, the absolute value of the slope at a depth of 80 μm on the compressive stress profile of the chemically strengthened glass-ceramic is |K 80μm 3.21 MPa / μm, 2.55 MPa / μm, 4.05 MPa / μm, 3.05 MPa / μm, 2.85 MPa / μm, 2.81 MPa / μm, 3.17 MPa / μm, 3.10 MPa / μm, 3.55 MPa / μm, 3.00 MPa / μm, 3.85 MPa / μm, 3.26 MPa / μm, 3.38 MPa / μm, 2.57 MPa / μm, or 3.78 MPa / μm.

[0075] As an optional embodiment, a Vickers hardness tester with a Vickers hardness grade of 6 and a 35° angle between the horizontal projection and the tip of the Vickers hardness tester is used, and the tip of the Vickers hardness tester is vertically penetrated into the chemically strengthened glass-ceramic with a thickness of not less than 0.35 mm along the thickness direction, and when the penetration depth is 80 μm, the load F 80μm required to be applied is ≥ 100 N, preferably the load F 80μm required to be applied is ≥ 110 N; and / or,

[0076] The chemically strengthened glass-ceramic with a thickness of not less than 0.35 mm is subjected to a sandpaper drop test, and the average sandpaper drop height of the chemically strengthened glass-ceramic is ≥ 0.8 m, preferably the average sandpaper drop height of the chemically strengthened glass-ceramic is ≥ 1.0 m.

[0077] In a second aspect, a glass device is provided, the glass device comprising the chemically strengthened glass-ceramic according to any one of the embodiments of the first aspect.

[0078] In a third aspect, a cover glass is provided, the cover glass is made of the chemically strengthened microcrystalline glass according to any one of the embodiments of the first aspect, and the cover glass comprises the chemically strengthened microcrystalline glass according to any one of the embodiments of the first aspect. The cover glass can be a display cover, a back cover or a camera protection cover of an electronic device.

[0079] In a fourth aspect, an electronic device is provided, the electronic device comprises the chemically strengthened microcrystalline glass according to any one of the embodiments of the first aspect.

[0080] As an optional embodiment, the electronic device comprises a housing assembled on the outer side of the electronic device, and a circuit board located inside the housing, the housing comprises the chemically strengthened microcrystalline glass according to any one of the embodiments of the first aspect.

[0081] As an optional embodiment, the housing comprises a display cover assembled on the front side of the electronic device, the display cover comprises the chemically strengthened microcrystalline glass according to any one of the embodiments of the first aspect.

[0082] As an optional embodiment, the housing comprises a back cover assembled on the back side of the electronic device, the back cover comprises the chemically strengthened microcrystalline glass according to any one of the embodiments of the first aspect.

[0083] As an optional embodiment, the electronic device further comprises a camera assembly located inside the housing, the housing comprises a camera protection cover, the camera protection cover covers the camera assembly, and the camera protection cover comprises the chemically strengthened microcrystalline glass according to any one of the embodiments of the first aspect.

[0084] As an optional embodiment, the electronic device further comprises a middle frame located between the display module and the housing, the middle frame comprises the chemically strengthened microcrystalline glass according to any one of the embodiments of the first aspect.

[0085] In some embodiments, the housing can be partially made of the chemically strengthened microcrystalline glass, or can be entirely made of the chemically strengthened microcrystalline glass. The electronic device in the present application can be one or more of the display cover, the back cover, the camera protection cover, and the middle frame, which are made of the chemically strengthened microcrystalline glass according to any one of the embodiments of the first aspect.

[0086] Compared with the prior art, one or more of the above technical solutions provided in the present application have the following advantages:

[0087] The application can better realize the coordination among thickness, crystal phase structure and stress structure, better improve the damage resistance of the chemically strengthened microcrystalline glass, and realize that the chemically strengthened microcrystalline glass with different thicknesses can all maintain high strength performance requirements and can ensure that the chemically strengthened microcrystalline glass with different thicknesses all has excellent sharp object penetration resistance and excellent rough surface drop damage resistance. Especially for the case of thin thickness requirement, the chemically strengthened microcrystalline glass provided by the application improves the problem that the sharp object penetration resistance and the rough surface drop damage resistance of the existing chemically strengthened microcrystalline glass need to be improved after the thickness is thinned, and endows the ultrathin chemically strengthened microcrystalline glass with excellent sharp object penetration resistance and excellent rough surface drop damage resistance. At the same time, the chemically strengthened microcrystalline glass of the application maintains excellent optical performance and can meet the application requirements of cover plate glass. BRIEF DESCRIPTION OF DRAWINGS

[0088] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0089] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0090] FIG. 1 is an XRD pattern of the microcrystalline glass of Example 1 of the present application, wherein "S1" in the figure refers to Example 1, and "S1" in FIGS. 2 and 4 also refers to Example 1;

[0091] FIG. 2 is a comparison diagram of the XRD patterns of the microcrystalline glass and the chemically strengthened microcrystalline glass of Example 1 of the present application;

[0092] FIG. 3 is a transmittance curve diagram of the microcrystalline glass provided by Example 1 of the present application;

[0093] FIG. 4 is a transmittance comparison diagram of the microcrystalline glass and the chemically strengthened microcrystalline glass provided by Example 1 of the present application;

[0094] FIG. 5 is a schematic diagram of the anti-penetration test in the present application;

[0095] FIG. 6 is a partial structure schematic diagram of the Mohs hardness pen used for the anti-penetration test in the present application;

[0096] FIG. 7 is a surface compressive stress curve diagram of the chemically strengthened microcrystalline glass of Example 3 and Comparative Example 2 of the present application;

[0097] Figure 8 is a plot of the relationship between the penetration depth and the applied force when the chemically strengthened glass-ceramics of Example 3 and Comparative Example 2 were subjected to the penetration test using a M6 Mohs hardness pencil;

[0098] Figure 9 is a schematic diagram of the front side structure of an electronic device according to an embodiment of the present application;

[0099] Figure 10 is a schematic diagram of the rear side structure of an electronic device according to an embodiment of the present application;

[0100] Figure 11 is a schematic diagram of the structure of an electronic device according to an embodiment of the present application.

[0101] Reference numerals: 1 - housing; 11 - display screen cover plate; 12 - rear cover; 13 - camera protection cover plate; 2 - camera assembly; 3 - middle frame; 4 - display module. DETAILED DESCRIPTION

[0102] The embodiments of the present application will be described in detail below with examples, but those skilled in the art will understand that the following examples are only for illustration of the present application and should not be considered as limiting the scope of the present application. The specific conditions are not specified in the examples, and the conventional conditions or the conditions recommended by the manufacturer are used. The reagents or instruments used are not specified by the manufacturer, and are conventional products that can be purchased on the market.

[0103] The endpoints of the ranges and any values disclosed herein are not limited to the precise values stated. The endpoints of the ranges and any values are provided as approximate descriptions of the ranges and are understood to be open-ended. Each range has a range endpoint value, and each separate point has a point value, and the combination of the range endpoint values and the point values can be combined to form one or more new ranges, which should be considered as specifically disclosed herein. The terms "optional", "optional" and other similar terms mean that the inclusion can or can not occur (or can or can not be present). The term "and / or" is inclusive, for example, "A and / or B" means only A, or only B, or both A and B.

[0104] Terminology and test methods:

[0105] In the present application, glass-ceramics is a kind of solid composite material containing both glass phase and crystal phase (or also known as microcrystalline phase, crystalline phase) prepared by targeted and controlled heat treatment of base glass. Glass-ceramics is also known as glass ceramic or crystallized glass or crystallized glass or crystalline glass.

[0106] In the present application, the chemically strengthened glass-ceramics refers to a solid composite material obtained by chemical strengthening treatment of the glass-ceramics. It should be understood that, during the chemical strengthening treatment, the alkali metal ions with large ionic radius (e.g., potassium ions or sodium ions) in the molten salt bath (or also referred to as the molten salt bath) will replace the alkali metal ions with small ionic radius (e.g., sodium ions or lithium ions) in the glass-ceramics, thereby generating an exchange ion volume difference and generating a compressive stress (or also referred to as a compression stress) on the surface of the glass-ceramics.

[0107] In the present application, the base glass refers to a glass that has not been subjected to nucleation treatment, crystallization treatment and strengthening treatment, or also referred to as a basic glass.

[0108] In the present application, the composition at the center of the chemically strengthened glass-ceramics refers to the composition at or near the center of the depth or thickness of the chemically strengthened glass-ceramics, that is, the composition of the region in the chemically strengthened glass-ceramics that has not been subjected to ion exchange.

[0109] In the present application, the visible light wavelength range refers to 360 nm to 740 nm.

[0110] In the present application, the main crystal phase (or also referred to as the primary crystal phase) refers to a crystal phase with a higher mass content than other crystal phases present in the glass-ceramics or the chemically strengthened glass-ceramics.

[0111] In the present application, the main surface refers to the surface with the largest surface area, such as the upper surface or the lower surface of the horizontally placed glass-ceramics sheet.

[0112] In the present application, the crystallinity refers to the percentage of the total mass of the crystal phase in the glass-ceramics or the chemically strengthened glass-ceramics to the mass of the glass-ceramics or the chemically strengthened glass-ceramics, or also referred to as the total content of the crystal phase in the glass-ceramics or the chemically strengthened glass-ceramics.

[0113] In the present application, when light of a certain wavelength is irradiated onto the main surface of the glass-ceramics or the chemically strengthened glass-ceramics, the light will be reflected, absorbed and transmitted, and the ratio of the intensity of the transmitted portion to the intensity of the incident light is the transmittance.

[0114] In the present application, the crystallized glass raw material refers to a glass raw material that has been heat treated for a period of time to achieve a certain crystallinity, but has not yet reached the target crystallinity, and can continue to crystallize to reach the target crystallinity under heating.

[0115] In the present application, CT_LD refers to the tensile stress linear density, with the unit of MPa / mm. It should be understood that after the glass-ceramic is placed in a molten salt bath for ion exchange, a compressive stress layer (or also referred to as a compressive stress layer) is formed on the surface of the glass-ceramic, and a tensile stress layer (or also referred to as a tensile stress layer) is formed inside the glass-ceramic. Exemplarily, during chemical strengthening treatment, alkali metal ions with a large radius in the molten salt bath are ion exchanged with alkali metal ions with a small radius in the glass-ceramic, thereby forming a compressive stress layer on the surface of the glass-ceramic and a tensile stress layer inside the glass-ceramic, that is, a chemically strengthened glass-ceramic containing a compressive stress layer and a tensile stress layer is prepared. In the present application, CT_LD is calculated by the following formula:

[0116] wherein t is the thickness of the chemically strengthened glass-ceramic, with the unit of mm; DOL_0 is the depth of the compressive stress layer of the chemically strengthened glass-ceramic, with the unit of μm; |CT_AV| is the absolute value of the average tensile stress of the tensile stress layer of the chemically strengthened glass-ceramic, with the unit of MPa. It should be understood that in the calculation formula of the tensile stress linear density, the data is substituted into the calculation according to the above unit requirements, and the calculation result is obtained, and the unit does not participate in the calculation.

[0117] In the present application, CS_80 refers to the compressive stress value at a depth of 80 μm from the main surface of the chemically strengthened glass-ceramic, or the compressive stress value at a distance of 80 μm from the main surface of the chemically strengthened glass-ceramic, with the unit of MPa, which is obtained by SLP-2000 stress meter testing.

[0118] In the present application, |CT_AV| refers to the absolute value of the average tensile stress, with the unit of MPa, specifically the absolute value of the average of all tensile stresses in the tensile stress layer, which is obtained by SLP-2000 stress meter testing.

[0119] In the present application, DOL_0 refers to the depth of the compressive stress layer, or the depth of the compressive stress layer, specifically the distance from any main surface of the chemically strengthened glass-ceramic to the position close to the surface where the compressive stress is zero, which is obtained by SLP-2000 stress meter testing.

[0120] In the present application, the test method of the stress performance is as follows: the SLP-2000 stress meter is used for testing, the light source wavelength is 518 nm, SOC = 25.5 (nm / cm) / MPa, the refractive index = 1.54, and the exposure time is 300 μsec. When the stress performance of the chemically strengthened glass ceramic is tested, a conductive liquid is first dropped on the stress meter, and then the chemically strengthened glass ceramic sample to be tested is cleaned and placed on the test path to test the stress value. The stress meter is SLP-2000, and the conductive liquid used is a conductive liquid with a refractive index of 1.51. Then, the tensile stress linear density (CT_LD) value of the chemically strengthened glass ceramic is calculated by the aforementioned calculation formula of the tensile stress linear density, and the value of is calculated by the stress data of the chemically strengthened glass ceramic measured by the SLP-2000.

[0121] In the present application, the b value is used to represent the yellow-blue value of the material. The b value in the present application is the transmitted light b value, and a positive b value indicates that the material is blue.

[0122] In the present application, the nucleation treatment refers to growing small crystal nuclei from the nucleation substances in the base glass through heat treatment, and the crystallization treatment refers to growing certain crystals on the basis of the crystal nuclei through heat treatment.

[0123] In the present application, the thickness is tested by a micrometer. It should be understood that the ion exchange degree changes in a gradient from the surface to the center in the thickness direction of the glass ceramic sample, and the total Na-K and / or Li-Na exchange amount increment (mass) is generally not more than 1.5% of the total mass of the sample, so the expansion effect in the thickness direction is extremely slight, and the thickness can be approximately considered to be basically unchanged. That is, the thickness of the glass ceramic changes very little before and after chemical strengthening, and can be basically ignored, and the thickness of the glass ceramic is basically the same as that of the chemically strengthened glass ceramic prepared therefrom.

[0124] In the present application, the size specification of the glass ceramic sheet is tested by a two-dimensional measuring machine (instrument model Miyu MY-YXCL-4030).

[0125] In the present application, the Young's modulus is used to represent the ability of the glass to resist elastic deformation caused by external force. In the present application, the UMS-100 ultrasonic material characterization system is used to test the Young's modulus of the glass ceramic by acoustic waves.

[0126] Thermal expansion softening point test: the sample is prepared into a cylinder with a diameter of 5.5 mm and a length of 20 mm, and a thermal dilatometer LINSEIS L75VD1000 is used to test the sample to output a thermal expansion test curve. The temperature corresponding to the peak position of the curve is the thermal expansion softening point temperature of the sample.

[0127] In the present application, the crystalline phase, crystallinity and average grain size of the glass-ceramics or chemically strengthened glass-ceramics are confirmed by XRD test. Specifically:

[0128] (1) XRD test: The glass-ceramics or chemically strengthened glass-ceramics of the present application are crushed and ground into samples with a particle size of less than 75 μm, and the ground samples are tested by X-ray diffractometer to obtain XRD diffraction peak curve and XRD diffraction data. The X-ray diffractometer used in the present application is Shimadzu XRD-6100, the target material is copper, 2θ = 10°-50°, the scanning speed is 0.2° / min, the working voltage is 40 kV, and the working current is 30 mA.

[0129] (2) Determination of crystalline phase: The XRD diffraction data are analyzed by Jade software (JADE Standard 8.6) to determine the crystalline phase in the sample.

[0130] (3) Determination of crystallinity: The test results of XRD (RAW format) are imported into X-ray diffraction data Rietveld refinement software Jade for fitting and calculation, so as to determine the crystallinity of the sample. Specifically, the ratio of the peak area of the fitting crystalline phase to the total peak area of the fitting is recorded as the crystallinity of the sample.

[0131] (4) Determination of average grain size: According to the Scherrer formula D = Kλ / (βcosθ), the average grain size (or also called average crystal size) of the sample can be calculated from the result data obtained by XRD test. Wherein, λ is the X-ray wavelength, λ = 0.154056 nm, β is the half-height width of the diffraction peak, K = 0.89, and θ is the Bragg diffraction angle. Specifically, the RAW format file output by the XRD instrument is curve-fitted in Jade software, and the fitting report is output by Jade. According to the angle 2θ value and the Peak FWHM value corresponding to each diffraction peak in the fitting report, the Peak FWHM value is converted to radian system: β = (FWHM / 180×3.14), and the grain size of each diffraction peak is calculated by Scherrer formula D = Kλ / (βcosθ) and then averaged to obtain the average grain size in the sample.

[0132] In the present application, the transmittance and b value of the glass-ceramics are tested by a haze meter according to the national standard GB / T 7962.12-2010 Optical Glass - Test Methods - Part 12: Spectral Transmittance. Specifically, the transmittance and b value of light with different wavelengths of 5 glass-ceramics from the same batch are tested by the haze meter. The average of the b values of the 5 glass-ceramics is taken as the b value of the glass-ceramics. The average of the transmittance of the 5 glass-ceramics under the light with a wavelength of 550 nm is taken as the transmittance of the glass-ceramics under the light with a wavelength of 550 nm. The haze meter used in the present application is a Konica Minolta Spectrophotometer CM-3600A, the light receiving optical system is transmission, the spectral method is plane diffraction grating, the wavelength range is 360 nm-740 nm, the wavelength interval is 10 nm, the illumination light source is pulse xenon lamp x 4, and the instrument is placed in an environment with a temperature of 24°C and an air humidity of 40%.

[0133] In the present application, the transmittance curve of the glass-ceramics under the light with a wavelength ranging from 200 nm to 1000 nm is also tested by a Shimadzu UV-2600 UV-visible spectrophotometer.

[0134] The refractive index refers to the ratio of the propagation speed of light in vacuum to the propagation speed of light in the medium.

[0135] Puncture resistance test: In the present application, the tip of a Mohs hardness pen is punctured into the chemically strengthened glass-ceramics along the thickness direction to simulate the puncture of a sharp protruding object into the chemically strengthened glass-ceramics. The puncture resistance of the chemically strengthened glass-ceramics to the sharp object is obtained by the puncture test of a single sharp object, which can simulate the application scenario of the chemically strengthened glass-ceramics falling onto the ground with a sharp protruding object. When the tip of the Mohs hardness pen is punctured to a depth of 80 μm, the load F 80μm In the present application, the pen with a Mohs hardness of 6 from Mineralab, USA, is used as the test pen. The reason for selecting the pen with a Mohs hardness of 6 for testing is mainly that the environment that the cover glass of the electronic device may contact in daily life, such as cement ground and fine sand ground, has a hardness roughly equivalent to that of the pen with a Mohs hardness of 6. The load F 80μm required to puncture the chemically strengthened glass-ceramics to a depth of 80 μm is used to characterize the puncture resistance of the sample. When F 80μm is greater, it means that the load or force required to puncture the chemically strengthened glass-ceramics to a depth of 80 μm by the tip of the pen with a Mohs hardness of 6 is greater, indicating that the chemically strengthened glass-ceramics is more difficult to puncture and has better puncture resistance.

[0136] The specific operation steps of the anti-penetration test include: first, placing a stainless steel plate on the bottom ring of a tensile testing machine (LT-850A), then placing the chemical strengthened glass-ceramic sample to be tested on the stainless steel plate, and providing a MineraLab pencil with a Mohs hardness of 6 (M6) (the sharp angle at the tip of the pencil is 35°, as shown in FIG. 6), starting the test software, setting the moving speed to 1 mm / min, clicking start test, and the M6 pencil will apply force to the center of the chemical strengthened glass-ceramic sample to be tested at the set moving speed until the chemical strengthened glass-ceramic sample cracks and breaks, as shown in FIG. 5. The original data of the penetration depth and the load applied to the tip of the M6 pencil are output by the test software, and the load F 80μm applied to the tip of the M6 pencil when the penetration depth is 80 μm is taken as a characterization value of the anti-penetration performance of the chemical strengthened glass-ceramic sample. Ten pieces of chemical strengthened glass-ceramic samples of the same batch are tested, and the average value of the test results is taken as the F 80μm .

[0137] The local penetration-induced fragmentation refers to that when the glass surface collides with a sharp object (such as a small stone or cement) with a higher hardness, the glass surface is locally damaged, a crack propagation source is formed at the damage point, and when the compressive stress level of the glass surface is not enough to offset the energy brought by the collision, the crack propagation will pass through the glass surface area. When the crack in the thickness direction reaches the compressive stress layer region, the crack will rapidly expand in the tensile stress region, so that the crack penetrates through the entire glass, thereby causing the glass to break.

[0138] Density test: In the present application, the electronic density balance SD-200L of Japan ALFAMIRAGE is used to test the density of the glass-ceramic.

[0139] Refractive index test: In the present application, the Abbe refractometer WYA-2WAJ of China Shanghai Libenchbangxi Instrument Technology is used to test the refractive index of the glass-ceramic.

[0140] Average anti-sandpaper drop height test: In the present application, the anti-sandpaper drop height of each sample of the chemical strengthened glass-ceramic samples of the same embodiment or the same comparative example is added, and the value obtained by dividing the number of samples is recorded as the average anti-sandpaper drop height of the chemical strengthened glass-ceramic, which is used to characterize the anti-drop damage performance of the chemical strengthened glass-ceramic. Here, the anti-drop damage capability is obtained by using uniform sandpaper, which can simulate the application scenario of the chemical strengthened glass-ceramic falling onto a ground with a relatively uniform roughness.

[0141] Specifically, at least 10 samples of each batch are tested, and the average anti-sandpaper drop height

[0142] Wherein, n is the number of glass samples tested per batch, hi is the sandpaper drop height of a single sample test;

[0143] Wherein, the test method of the sandpaper drop height of a single sample is as follows:

[0144] Step 1: Paste 80-mesh sandpaper on the lower surface of a model machine under 181 g, and place the model machine on a green chart LT-SKDL-CD type drop machine;

[0145] Step 2: Place the chemically strengthened microcrystalline glass sample to be tested directly below the model machine, with the chemically strengthened microcrystalline glass sample facing the sandpaper. Make the model machine impact and fall at a certain drop height, impacting the chemically strengthened microcrystalline glass sample directly below the model machine. If the chemically strengthened microcrystalline glass sample does not break, increase the drop height of the model machine in a certain manner, and continue to impact and fall the model machine, impacting the chemically strengthened microcrystalline glass sample directly below the model machine, until the chemically strengthened microcrystalline glass sample breaks. For example, the drop height of the model machine is 0.4 m, and the sample is impacted once. If the sample does not break, the drop height of the model machine is increased by 0.1 m, and the sample is impacted again. Repeat the above process until the chemically strengthened microcrystalline glass sample breaks.

[0146] Step 3: The last drop height before the chemically strengthened microcrystalline glass sample breaks is recorded as its sandpaper drop height. For example, if the drop height is increased by 0.1 m each time, and the sample breaks when the drop height is 0.5 m, then the sandpaper drop height of the sample is 0.4 m.

[0147] Without being limited by any theory, it is speculated that the crystal phase structure, stress structure and thickness of the chemically strengthened microcrystalline glass are closely related to the damage resistance of the chemically strengthened microcrystalline glass, especially the sharp object penetration resistance and the rough surface drop damage resistance. However, how to better realize the coordination of the three to better improve the damage resistance of the chemically strengthened microcrystalline glass needs further study. In the present application, for chemically strengthened microcrystalline glasses of different thicknesses, by making the stress structure of the chemically strengthened microcrystalline glass with a specific crystal phase structure satisfy a specific relationship requirement with the thickness, the chemically strengthened microcrystalline glasses of different thicknesses can all maintain high strength performance requirements, and can all have excellent sharp object penetration resistance and excellent rough surface drop damage resistance.

[0148] The chemically strengthened microcrystalline glass provided in the present application has petalite crystal phase and lithium disilicate crystal phase as the main crystal phase, and the thickness and stress characteristics of the chemically strengthened microcrystalline glass satisfy a specific relationship requirement.

[0149] As described above, in some embodiments of the present application, a chemically strengthened glass-ceramic is provided, the chemically strengthened glass-ceramic comprising a petalite crystal phase and a lithium disilicate crystal phase, wherein the petalite crystal phase and the lithium disilicate crystal phase have a higher mass percentage than other crystal phases present in the chemically strengthened glass-ceramic;

[0150] The chemically strengthened glass-ceramic has a compressive stress layer on the surface and a tensile stress in the interior; the chemically strengthened glass-ceramic satisfies:

[0151] 90 μm≤DOL_0;

[0152] A is 5-15;

[0153] wherein: T is the thickness of the chemically strengthened glass-ceramic, in mm; t is the depth from the main surface of the chemically strengthened glass-ceramic, and CS(t) is the compressive stress value at the depth of t, is the compressive stress integral of the chemically strengthened glass-ceramic from any main surface to the compressive stress layer at a depth of 80 μm from the main surface, in MPa·μm; in formula A, the data is substituted into the formula as required by the units to obtain the calculation result, and the units are not involved in the calculation.

[0154] The lithium disilicate (Li2Si2O5) crystal phase is an orthorhombic crystal based on a [Si2O5] tetrahedral array, and the shape of the crystal is flat or plate-like. The petalite LiAlSi4O 10 is a monoclinic crystal, which has a three-dimensional framework structure comprising a layered structure with folded Si2O5 layers connected by Li and Al tetrahedra. The microcrystalline glass with petalite and lithium disilicate as the main crystal phase has a crystallinity of more than 70 wt%, and the presence of a large amount of microcrystalline phase in the microcrystalline glass is beneficial to better prevent the propagation of cracks and consume more impact energy during the process of breaking and crushing, thereby improving the strength and fracture toughness of the microcrystalline glass. At the same time, the optical refractive index of the lithium disilicate crystal is close to the glass matrix (such as the base glass for preparing the microcrystalline glass in the present application), which is an ideal crystal phase for preparing high-transparency microcrystalline glass. In addition, both the lithium disilicate crystal phase and the petalite crystal phase contain lithium ions that can participate in ion exchange, and can be chemically strengthened in a molten salt bath. Na + and / or K + substitute Li + in the crystal phase structure, which can form a surface stress structure and is beneficial to further improve the mechanical strength performance of the microcrystalline glass.

[0155] In the present application, the chemically strengthened glass-ceramics contains petalite crystal phase and lithium disilicate crystal phase as main crystal phases, which is beneficial to obtain desired stress structure while ensuring high intrinsic strength (or also known as inherent strength), and thus ensure the chemically strengthened glass-ceramics to achieve excellent damage resistance performance under ultra-thin thickness.

[0156] In the present application, when the value of formula A is too small, the chemically strengthened glass-ceramics is difficult to simultaneously consider excellent anti-penetration performance and anti-rough surface drop damage performance, and when the value of formula A is too large, the chemically strengthened glass-ceramics will have problems of large thickness, and will have problems of excessive internal stress leading to unstable overall structure and poor safety, which will greatly limit the application of the chemically strengthened glass-ceramics.

[0157] In the present application, by making the chemically strengthened glass-ceramics meet the requirements of specific crystal phase structure and formula A, the thickness, crystal phase structure and stress structure are cooperated well under the condition of ensuring that the thickness of the chemically strengthened glass-ceramics meets the requirements of different electronic device applications, which can better improve the damage resistance performance of the chemically strengthened glass-ceramics, especially can ensure to obtain the chemically strengthened glass-ceramic product with excellent anti-penetration performance and excellent anti-rough surface drop damage performance. In addition, the chemically strengthened glass-ceramics of the present application also has excellent anti-penetration performance and excellent anti-rough surface drop damage performance even when the thickness is thin, which can reduce the probability of damage to the screen of the electronic device, ensure the beauty of the screen, and thus can meet the market demand for large screen and light and thin electronic devices.

[0158] In some embodiments, the chemically strengthened glass-ceramics satisfies: DOL_0 can be 90 μm to 200 μm, 90 μm to 170 μm, 90 μm to 160 μm, 95 μm to 150 μm, 100 μm to 150 μm, 95 μm to 145 μm, or 100 μm to 145 μm. In some embodiments, the chemically strengthened glass-ceramics satisfies: DOL_0 can be greater than or equal to 90 μm, greater than or equal to 95 μm, greater than or equal to 100 μm, greater than or equal to 105 μm, greater than or equal to 110 μm, greater than or equal to 115 μm, or greater than or equal to 120 μm, or can be a value within a range defined by any two of the above-mentioned specific values as endpoints, as long as a chemically strengthened glass-ceramic with desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above-mentioned ranges can be combined with any other range, as long as a chemically strengthened glass-ceramic with desired properties of the present application can be obtained. By having a suitable depth of compressive stress layer DOL_0, the chemically strengthened glass-ceramic can be more resistant to sudden cracks caused by impact or penetration of blunt or sharp objects, which can directly penetrate the compressive stress region to the tensile stress region, and thus can be more resistant to breakage of the chemically strengthened glass-ceramic. In turn, the chemically strengthened glass-ceramic can be more resistant to energy that drives crack propagation, and thus can have excellent damage resistance, such as excellent sharp object penetration resistance and excellent rough surface drop damage resistance.

[0159] In some embodiments, the chemically strengthened glass-ceramics satisfies: DOL_0 can be 90 μm, 95 μm, 100 μm, 105 μm, 113 μm, 115 μm, 111.48 μm, 110.32 μm, 113.85 μm, 114.65 μm, 113.82 μm, 124.84 μm, 116.25 μm, 129.90 μm, 114.26 μm, 136.58 μm, 115.54 μm, 144.85 μm, 109.58 μm, 108.86 μm, 98.00 μm, 120 μm, 125 μm, 130 μm, 140 μm, 150 μm, 160 μm, or 170 μm, or can be a value within a range defined by any two of the above-mentioned specific values as endpoints, as long as a chemically strengthened glass-ceramic with desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above-mentioned ranges can be combined with any other range, as long as a chemically strengthened glass-ceramic with desired properties of the present application can be obtained.

[0160] In some embodiments, the chemically strengthened glass satisfies the formula A: 5≤A≤15, 6≤A≤14, 7≤A≤13, 8≤A≤12, 9≤A≤10, 5≤A≤10, or 10≤A≤15. In some embodiments, the chemically strengthened glass satisfies the formula A: A can be 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 7.635, 5.809, 9.060, 5.907, 5.426, 7.067, 6.609, 9.628, 5.999, 9.782, 6.541, 12.510, 6.503, 5.806, 5.430, or 15, or a value within a range between any two of the foregoing specific values, as long as the chemically strengthened glass having the desired properties of the present application is obtained. It should be understood that in specific embodiments, any of the foregoing ranges can be combined with any other range, as long as the chemically strengthened glass having the desired properties of the present application is obtained.

[0161] In some embodiments of the present application, the chemically strengthened glass satisfies the formula B: 550≤B≤3500.

[0162] B = |CT_AV| x DOL_0 x (1000 x T 2.8 - 2 x DOL_0 x T 1.8 ) / 1000, where B has a value of 550 to 3500.

[0163] where T is the thickness of the chemically strengthened glass in mm, |CT_AV| is the absolute value of the average tensile stress in MPa, and DOL_0 is the depth of the compressive stress layer in μm. The data is substituted into the formula B according to the above units, and the result is obtained, and the unit is not involved in the calculation. By satisfying the specific relationship between the thickness and the stress of the chemically strengthened glass, the damage resistance of the chemically strengthened glass is improved.

[0164] In some embodiments, the chemically strengthened glass-ceramics satisfies the formula B can be 800-3500, 900-3400, 1000-3300, 1200-3000, 1500-2800, 1800-2500, 800-2500 or 2500-3500. In some embodiments, the chemically strengthened glass-ceramics satisfies the formula B can be 800, 850, 900, 950, 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500, 1550, 1600, 1650, 1700, 1750, 1800, 1850, 1900, 1950, 2000, 2050, 2100, 2150, 2200, 2250, 2300, 2350, 2400, 2450, 2500, 2550, 2600, 2650, 2700, 2750, 2800, 2850, 2900, 2950, 3000, 3050, 3100, 3150, 3200, 3250, 3300, 3350, 3400, 955.0, 877.3, 1175.9, 1043.3, 1209.0, 1320.5, 1398.7, 1989.5, 1621.4, 2339.9, 2340, 1729.7, 2879.3, 995.6, 895.9, 562.9, 3450 or 3500, or a value within a range defined by any two of the above specific values as endpoints, as long as the chemically strengthened glass-ceramics with desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramics with desired properties of the present application can be obtained.

[0165] In some embodiments of the present application, the thickness T of the chemically strengthened glass-ceramics is less than or equal to 1 mm, preferably, the thickness T of the chemically strengthened glass-ceramics is 0.3-1 mm, more preferably, the thickness T of the chemically strengthened glass-ceramics is 0.35-0.70 mm. Electronic devices tend to pursue thin and light, and when the thickness is too large, on the one hand, it will increase the weight, on the other hand, it will lead to poor optical effect, which is not conducive to achieving high transparency.

[0166] In some embodiments, the thickness T of the chemically strengthened glass-ceramics may be 0.30 mm to 1 mm, 0.30 mm to 0.9 mm, 0.30 mm to 0.8 mm, 0.35 mm to 0.7 mm, or 0.7 mm to 1.0 mm. In some embodiments, the thickness T of the chemically strengthened glass-ceramics can be 0.30 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, 0.475 mm, 0.505 mm, 0.545 mm, 0.590 mm, 0.620 mm, 0.650 mm, 0.500 mm, or 0.400 mm, or can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. It should be understood that, in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the chemically strengthened glass-ceramics with the desired properties of the present application can be obtained.

[0167] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfies:

[0168] Preferably,

[0169] More preferably,

[0170] Without being bound by any theory, the larger the area enclosed by the compressive stress curve and the straight line y=0, the straight line x=0, and the straight line x=80μm, the greater the stress intensity value within the range of the compressive stress layer depth of 0μm and the compressive stress layer depth of 80μm, indicating that its surface stress level is better, which is conducive to ensuring that the chemically strengthened microcrystalline glass achieves excellent resistance to sharp object penetration and resistance to damage from falling on rough surfaces.

[0171] In some embodiments, The value of may be 10000 MPa·μm to 35000 MPa·μm, 12000 MPa·μm to 32000 MPa·μm, 15000 MPa·μm to 30000 MPa·μm, 18000 MPa·μm to 28000 MPa·μm, 20000 MPa·μm to 25000 MPa·μm, 10000 MPa·μm to 15000 MPa·μm, 15000 MPa·μm to 35000 MPa·μm or 15000 MPa·μm to 25000 MPa·μm. In some embodiments, The value of the product of the surface compressive stress and the thickness of the compressive layer can be 10000 MPa·µm, 12000 MPa·µm, 14000 MPa·µm, 16000 MPa·µm, 18000 MPa·µm, 20000 MPa·µm, 22000 MPa·µm, 24000 MPa·µm, 26000 MPa·µm, 28000 MPa·µm, 30000 MPa·µm, 35000 MPa·µm, 23322.83 MPa·µm, 17745.62 MPa·µm, 25245.12 MPa·µm, 16459.20 MPa·µm, 13485.35 MPa·µm, 17564.52 MPa·µm, 14582.65 MPa·µm, 21245.19 MPa·µm, 12287.36 MPa·µm, 20036.85 MPa·µm, 12482.65 MPa·µm, 23872.85 MPa·µm, 18393.52 MPa·µm, 16421.45 MPa·µm, or 21464.39 MPa·µm, or can be a value within a range defined by any two of the above specific values as endpoints, as long as a chemically strengthened glass with desired properties of the present application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a chemically strengthened glass with desired properties of the present application is obtained.

[0172] In some embodiments of the present application, the chemically strengthened glass satisfies 70 MPa≤|CT_AV|≤160 MPa, preferably 77 MPa≤|CT_AV|≤160 MPa, and more preferably 110 MPa≤|CT_AV|≤150 MPa, where |CT_AV| is the absolute value of the average tensile stress. By keeping |CT_AV| of the chemically strengthened glass at an appropriate level, it is beneficial to ensure that the chemically strengthened glass has a desired tensile stress layer distribution structure, ensuring that it has a high surface stress level, and the higher the surface compressive stress level, the more residual energy of a drop, a crush, a penetration, an impact, or a collision can be offset, thereby ensuring that the chemically strengthened glass has excellent damage resistance, such as excellent sharp object penetration resistance and excellent rough surface drop damage resistance.

[0173] In some embodiments, the |CT AV| of the chemically strengthened glass-ceramics can be 70 MPa to 160 MPa, 80 MPa to 160 MPa, 90 MPa to 160 MPa, 100 MPa to 160 MPa, 77 MPa to 160 MPa, or 110 MPa to 150 MPa. In some embodiments, the |CT AV| of the chemically strengthened glass-ceramics can be 70 MPa, 80 MPa, 90 MPa, 100 MPa, 110 MPa, 129.8 MPa, 119.4 MPa, 127.4 MPa, 112.9 MPa, 99.8 MPa, 106.8 MPa, 87.0 MPa, 119.9 MPa, 85.7 MPa, 116.8 MPa, 77.6 MPa, 119.8 MPa, 112.66 MPa, 101.5 MPa, 146.5 MPa, 150 MPa, 155 MPa, or 160 MPa, or a value within a range having any two of the above specifically stated values as endpoints. It should be understood that any of the above ranges can be combined with any of the other ranges, as long as the chemically strengthened glass-ceramics has the desired properties.

[0174] In some embodiments of the present application, 0.17≤DOL 0 / T≤0.25, preferably, 0.18≤DOL 0 / T≤0.25. By satisfying the appropriate proportional relationship between the compressive stress layer depth and the thickness of the chemically strengthened glass-ceramics, it is beneficial to ensure that the chemically strengthened glass-ceramics is in a relatively optimal stress distribution state, and thus it is beneficial to exert the improvement effect of the stress structure on the mechanical strength performance.

[0175] In some embodiments, the DOL 0 / T of the chemically strengthened glass-ceramics can be 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, or 0.25, or a value within a range having any two of the above specifically stated values as endpoints. It should be understood that any of the above ranges can be combined with any of the other ranges, as long as the chemically strengthened glass-ceramics has the desired properties.

[0176] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfy: 50000 MPa / mm≤CT_LD≤80000 MPa / mm, preferably, 55000 MPa / mm≤CT_LD≤80000 MPa / mm, more preferably, 61000 MPa / mm≤CT_LD≤75000 MPa / mm, wherein CT_LD is the compressive stress linear density. By making the CT_LD of the chemically strengthened glass-ceramics no less than 50000 MPa / mm, it is beneficial to ensure that the compressive stress stored inside the chemically strengthened glass-ceramics is dense enough, and thus to ensure that it has a high surface stress level, and to ensure that it has excellent damage resistance, such as excellent rough surface drop damage resistance, to meet market demand.

[0177] In some embodiments, the CT_LD of the chemically strengthened glass-ceramics can be 50000 MPa / mm-75000 MPa / mm, 58000 MPa / mm-62000 MPa / mm, 55000 MPa / mm-80000 MPa / mm, 56000 MPa / mm-64000 MPa / mm, or 57000 MPa / mm-63000 MPa / mm. In some embodiments, the CT_LD of the chemically strengthened glass-ceramics can be 50000 MPa / mm, 55000 MPa / mm, 68873.25 MPa / mm, 63938.07 MPa / mm, 69956.48 MPa / mm, 61636.69 MPa / mm, 58114.73 MPa / mm, 57871.88 MPa / mm, 52716.10 MPa / mm, 67103.36 MPa / mm, 54112.64 MPa / mm, 65328.99 MPa / mm, 50012.60 MPa / mm, 66406.06 MPa / mm, 63278.87 MPa / mm, 57316.32 MPa / mm, 74715.00 MPa / mm, 75000 MPa / mm, 76000 MPa / mm, 77000 MPa / mm, 78000 MPa / mm, 79000 MPa / mm, or 80000 MPa / mm, or can be a value within a range defined by any two of the above specific values as endpoints, as long as a chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0178] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfy: 30 MPa≤CS_80, wherein CS_80 refers to the compressive stress value at a depth of 80 μm from the main surface of the chemically strengthened glass-ceramics. In some embodiments, the CS_80 of the chemically strengthened glass-ceramics can be 30 MPa, 35 MPa, 40 MPa, 45 MPa, 50 MPa, 55 MPa, 60 MPa, 69 MPa, 85 MPa, 114.7 MPa, 82.7 MPa, 118.7 MPa, 86.7 MPa, 68.7 MPa, 83.6 MPa, 69.5 MPa, 131.9 MPa, 77.5 MPa, 132.4 MPa, 62.1 MPa, 135.9 MPa, 91.26 MPa, 73.26 MPa, 59.5 MPa, 100 MPa, 110 MPa, 120 MPa, 130 MPa, 140 MPa, or 150 MPa, or can be a value within a range defined by any two of the above-mentioned specific values as endpoints, as long as a chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above-mentioned ranges can be combined with any other range, as long as a chemically strengthened glass-ceramics with the desired properties of the present application can be obtained.

[0179] It should be understood that the chemically strengthened glass-ceramics of the present application can be made from a glass-ceramics that has been chemically strengthened, and that the composition and phase assemblage of the chemically strengthened glass-ceramics at a depth deeper than the depth of the compressive stress layer (DOL), such as at the center of the chemically strengthened glass-ceramics or the tensile stress layer, is the same or substantially the same as the composition and phase assemblage of the glass-ceramics, unless an over-ion exchange treatment has been performed. Compared to the glass-ceramics before the chemical strengthening treatment, the composition at the surface of the glass-ceramics article after the chemical strengthening treatment can be different from the composition of the glass-ceramics before it goes through the ion exchange process. This is because, when ion exchange is performed, the type of alkali metal ions (e.g., Li + or Na + ) at the surface of the just-formed glass-ceramics is replaced by a larger alkali metal ion (e.g., Na + or K + ), respectively. However, in embodiments, the glass composition and phase assemblage at or near the depth or thickness center of the glass-ceramics article still has the composition and phase assemblage of the just-formed glass-ceramics. That is, in the present application, the composition (e.g., the composition of the tensile stress layer) and phase assemblage at the center of the chemically strengthened glass-ceramics made by the chemical strengthening treatment is the same or substantially the same as the glass-ceramics that has not been chemically strengthened.

[0180] The glass-ceramics of the present application can be prepared by heat treating a base glass. The base glass has the same or substantially the same composition as the glass-ceramics, in terms of mole percent of oxides.

[0181] In some embodiments of the present application, the base glass or the glass-ceramics or the composition of the central portion or the tensile stress layer of the chemically strengthened glass-ceramics comprises, in terms of mole percent of oxides, SiO2: 64-70%, Al2O3: 3.5-5.0%, P2O5: 0.7-1.5%, ZrO2: 1.5-3%, Na2O: 0-3%, K2O: 0-1%, Li2O: 20-26%, CaO: 0-1.5%, B2O3: 0-2%. By satisfying the specific glass composition, it is beneficial to obtain the glass-ceramics satisfying the specific crystal phase structure, and it is beneficial to obtain the chemically strengthened glass-ceramics satisfying the specific stress structure. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramics with the required properties of the present application can be obtained.

[0182] In the present application, SiO2 is an oxide that forms a glass network skeleton, which is used to stabilize the network structure of the base glass, and is also an important component of lithium disilicate crystal phase and petalite crystal phase. When the glass composition contains a sufficiently high content of SiO2, it is beneficial to form a sufficient amount of petalite crystals and lithium disilicate crystals. However, when the content of SiO2 is too high, it will not only cause the melting property of the glass to deteriorate, causing the viscosity of the molten glass liquid to rise, making it difficult to clarify the glass liquid, increasing the difficulty of forming the base glass, but also causing the heat treatment time to be longer when the base glass is prepared into a glass-ceramics. Therefore, in order to meet the glass forming property requirements and achieve the desired crystallization effect of the present application, the mole percent content of SiO2 in the present application is 64-70%, preferably 64-69.5%, more preferably 67.5-69.5%.

[0183] In some embodiments, the base glass or the glass-ceramics or the composition of the central portion or the tensile stress layer of the chemically strengthened glass-ceramics comprises, in terms of mole percent of oxides, SiO2: 64%, 65%, 66%, 67%, 68%, 69%, 69.5%, 70%, 68.02%, 64.39%, or 68.74%, or a value within a numerical range formed by any two of the above specific values as endpoints, as long as the glass-ceramics or the chemically strengthened glass-ceramics with the required properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the glass-ceramics or the chemically strengthened glass-ceramics with the required properties of the present application can be obtained.

[0184] In the present application, Al2O3 can be used to build the glass framework, and is an indispensable component to form petalite. Appropriate amount of Al2O3 can stabilize the glass network structure, which is conducive to improve the mechanical properties, chemical durability and chemical strengthening effect, and inhibit the phase separation of the glass, reduce the thermal expansion coefficient, and increase the strain point. When the content of Al2O3 is too low, the glass has a tendency to have a high thermal expansion coefficient, its chemical durability decreases, and the crystal nucleus becomes large, and the microcrystalline glass is prone to become cloudy; when the content of Al2O3 is too high, the melting property of the glass becomes poor, the production becomes difficult, and it is easy to precipitate mullite and other crystals to make the glass lose transparency. Therefore, in order to meet the desired crystal structure, make the microcrystalline glass or the chemically strengthened microcrystalline glass obtain the desired performance, the molar percentage content of Al2O3 in the present application is 3.5% to 5.0%, preferably 4% to 4.8%, more preferably 4% to 4.5%.

[0185] In some embodiments, the molar percentage of Al2O3 in the composition of the substrate glass or the composition of the microcrystalline glass or the composition at the center or the composition of the tensile stress layer of the chemically strengthened microcrystalline glass can be 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4%, 4.1%, 4.2%, 4.4%, 4.5%, 4.8%, 5.0%, 4.30%, 4.07% or 4.41%, or can be a value within a value range consisting of any two of the above specific values as endpoints, as long as the microcrystalline glass or the chemically strengthened microcrystalline glass with the desired performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the microcrystalline glass or the chemically strengthened microcrystalline glass with the desired performance of the present application can be obtained.

[0186] In the present application, P2O5 is a glass-forming oxide, which exists in the network structure as phosphorus-oxygen tetrahedrons [PO4]. P2O5 appears first during the heat treatment process, first causing the glass to phase separate and segregate to form an amorphous precursor phase Li3PO4, and then using Li3PO4 as a non-uniform nucleation point, crystalline phases such as lithium silicate grow attached to the amorphous Li3PO4. As the P2O5 content increases, the number of non-uniform nucleation points increases, and the grains with Li3PO4 as nucleation points are effectively refined, which is beneficial to improving the overall transmittance of the microcrystalline glass, the uniformity of the glass, and reducing the b value. However, when the P2O5 content is too high, more Li3PO4 crystals are easily generated, resulting in insufficient Li2O content to form lithium silicate and petalite, which in turn causes the substrate glass to easily precipitate quartz crystals, resulting in a decrease in the transmittance of the microcrystalline glass and a decrease in the overall optical uniformity of the microcrystalline glass. When the P2O5 content is too low, the precipitated crystals are too large, which can easily cause the glass to lose transparency. Therefore, in order to achieve the desired crystallization effect of the present application and make the microcrystalline glass or chemically strengthened microcrystalline glass obtain the desired performance, the molar percentage content of P2O5 is 0.7% to 1.5%, preferably 0.8% to 1.5%, and more preferably 0.8% to 1.2%.

[0187] In some embodiments, the molar percentage of P2O5 in the composition of the substrate glass, the composition of the glass-ceramics, or the center of the chemically strengthened glass-ceramics or the composition of the tensile stress layer, measured as a mole percentage of oxides, can be 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.17%, 1.14% or 0.95%, or can be a value within a numerical range consisting of any two of the above specific values ​​as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics having the desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other ranges, as long as the glass-ceramics or chemically strengthened glass-ceramics having the desired properties of the present application can be obtained.

[0188] In this application, an appropriate amount of ZrO2 can increase the viscosity, elastic modulus, refractive index, and chemical stability of the glass and reduce the thermal expansion coefficient of the glass. ZrO2 remains in the residual glass phase after heat treatment, which helps improve the mechanical strength of the residual glass phase. However, excessive ZrO2 increases the difficulty of melting the substrate glass and causes crystallization during the substrate glass melting process. Therefore, to meet the glass formability requirements and achieve the desired strength effect of this application, the molar percentage of ZrO2 is set to 1.5% to 3%, preferably 2.5% to 3%, and more preferably 2.6% to 3%.

[0189] In some embodiments, the mole percent of Zr02in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer can be 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 2.88%, 2.98%, or 2.89%, or a value within a range having any two of these specific numerical values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic having the desired properties herein is obtained. It will be understood that any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or chemically strengthened glass-ceramic having the desired properties herein is obtained.

[0190] In the present application, Na20 is an interstitial oxide, which can provide free oxygen. An appropriate amount of Na20 is beneficial to improve the viscosity of the glass, promote the melting and fining of the glass melt, and promote the precipitation of lithium disilicate crystal phase, reduce the crystallization tendency of the glass, and increase the transmittance of the glass. However, an excessive amount of Na20 can affect the network structure of the glass, and thus affect the strength performance of the glass-ceramic. Therefore, in order to ensure that the glass-ceramic or chemically strengthened glass-ceramic has the desired structure and obtains the desired properties, the mole percent of Na20 is 0-3%, preferably 0-2%, and more preferably 0-1%.

[0191] In some embodiments, the mole percent of Na20 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3%, 0.15%, or 0.78%, or a value within a range having any two of these specific numerical values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic having the desired properties herein is obtained. It will be understood that any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or chemically strengthened glass-ceramic having the desired properties herein is obtained.

[0192] In the present application, K2O is a glass network modifier, and an appropriate amount of K2O can reduce the tendency of crystallization of the glass, increase the transparency and gloss of the glass. However, when the content of K2O is too high, the crystallization ability of the glass becomes stronger, the glass is prone to devitrification, and the glass-ceramics is prone to breakage. Therefore, in order to ensure that the glass-ceramics or the chemically strengthened glass-ceramics meets the desired structure and obtains the desired performance, the molar percentage content of K2O is 0-1%, preferably 0-0.5%, and more preferably 0-0.3%.

[0193] In some embodiments, the molar percentage of K2O in the composition of the substrate glass or the composition of the glass-ceramics or the composition at the center or the composition of the compressive stress layer of the chemically strengthened glass-ceramics can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or 0.07%, or can be a value within a value range consisting of any two of the above specific values as endpoints, as long as a glass-ceramics or a chemically strengthened glass-ceramics with the desired performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramics or a chemically strengthened glass-ceramics with the desired performance of the present application can be obtained.

[0194] In the present application, Li2O is the main component of the petalite crystal phase and the lithium disilicate crystal phase, and is also necessary for chemical strengthening. An appropriate amount of Li2O is beneficial to ensure that the transparency, melt forming effect, crystallization ability, chemical strengthening performance, and the like of the glass-ceramics meet the requirements. When the content of Li2O is too low, not only is it easy to cause the glass to precipitate impurity crystal phases such as mullite, resulting in devitrification of the glass, but also it is easy to reduce the meltability or increase the viscosity of the glass, resulting in difficulty in forming the substrate glass; when the content of Li2O is too high, it is easy to affect the network structure of the glass, and also easy to make the crystallization ability of the glass too strong, increasing the devitrification tendency of the glass. Therefore, in order to obtain a glass-ceramics or a chemically strengthened glass-ceramics that meets the desired crystal phase structure, optical performance, and mechanical strength performance, the molar percentage content of Li2O is 20%-26%, preferably 20.5%-25%, and more preferably 20.5%-23.5%.

[0195] In some embodiments, the molar percent of Li20 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer can be 20%, 20.5%, 21%, 21.5%, 22%, 22.5%, 23%, 23.5%, 24%, 24.5%, 25%, 25.5%, 26%, 22.40%, 25.68%, or 21.48%, or a value within a range having any two of the aforementioned specific numeric values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It is understood that in specific embodiments, any of the aforementioned ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0196] In the present application, CaO can reduce the high temperature viscosity, which is beneficial for glass forming, and can also enhance the network structure, so that the stress gain of the glass-ceramic during the strengthening process is enhanced. When the content of CaO is too high, too much CaO remains in the glass phase, which will cause a refractive index difference with the main crystal phase, resulting in a decrease in the transmittance and an increase in the haze of the glass-ceramic. Therefore, in order to obtain a glass-ceramic or a chemically strengthened glass-ceramic that satisfies the desired optical and mechanical strength properties, the molar percent of CaO is 0-1.5%, preferably 0-1%, and more preferably 0.5-1%.

[0197] In some embodiments, the molar percent of CaO in the composition of the base glass or the composition of the glass-ceramic or the composition at the center of the chemically strengthened glass-ceramic or the composition of the compressive stress layer can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 0.89%, 0.93%, or 0.73%, or a value within a range having any two of the aforementioned specific numeric values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It is understood that in specific embodiments, any of the aforementioned ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0198] In the present application, B2O3 helps to reduce the melting temperature of the base glass, improve the transmittance, overall uniformity and other properties of the glass-ceramics. However, when the amount of B2O3 is too much, the stress of the chemically strengthened glass-ceramics will decrease, and the increase of the content of B2O3 in the residual glass phase will reduce the viscosity of the residual glass phase, promote the growth of lithium metasilicate crystals and affect the optical transmittance of the glass-ceramics. Therefore, in order to obtain glass-ceramics or chemically strengthened glass-ceramics that meet the desired optical and mechanical strength properties, the molar percentage content of B2O3 is 0-2%, preferably 0-1%, and more preferably 0-0.8%.

[0199] In some embodiments, the molar percentage of B2O3 in the composition of the base glass or the composition of the glass-ceramics or the composition at the center or the composition of the tensile stress layer of the chemically strengthened glass-ceramics can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 0.08% or 0.8%, or can be a value within the numerical range formed by any two of the above specific numerical values as endpoints, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the glass-ceramics or chemically strengthened glass-ceramics with the desired properties of the present application can be obtained.

[0200] In some embodiments of the present application, the molar percentage of ZrO2 [ZrO2], the molar percentage of CaO [CaO], the molar percentage of P2O5 [P2O5], the molar percentage of Na2O [Na2O], the molar percentage of K2O [K2O] and the molar percentage of B2O3 [B2O3] in the composition of the base glass or the composition of the glass-ceramics or the composition at the center or the composition of the tensile stress layer of the chemically strengthened glass-ceramics satisfy the following relationship:

[0201] 3.5%≤([ZrO2]+[CaO]+[P2O5]) / EXP([Na2O]+[K2O]+[B2O3])≤5.5%, preferably 4.5%≤([ZrO2]+[CaO]+[P2O5]) / EXP([Na2O]+[K2O]+[B2O3])≤5.3%. It should be noted that in the present application, the content of each oxide is substituted into the formula in terms of the molar percentage content of the oxide, and the molar unit does not participate in the calculation of the formula. By adjusting the content of each oxide to satisfy a specific content relationship, it is beneficial to obtain glass-ceramics or chemically strengthened glass-ceramics that meet the desired mechanical strength properties.

[0202] In some embodiments, the value of ([Zr02]+[CaO]+[P205]) / EXP([Na20]+[K20]+[B203]) can be 3.5%, 4.0%, 4.5%, 4.6%, 4.7%, 4.8%, 4.9%, 5%, 5.1%, 5.2%, 5.3%, 5.4%, 5.5%, 4.97%, or 4.53%, or a value within a range having any two of these specifically enumerated values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It will be appreciated that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0203] In some embodiments of the present application, the molar percentage of P205[P205] and the molar percentage of Al203[Al203] in the composition of the base glass or in the composition of the glass-ceramic or in the composition at the center of the chemically strengthened glass-ceramic or in the composition of the tensile stress layer satisfy the following relationship:

[0204] 5%≤[P205]+[Al203]≤6%, preferably 5.0%≤[P205]+[Al203]≤5.6%. By adjusting the content of P205and Al203to a specific range, it is beneficial to obtain a glass-ceramic or a chemically strengthened glass-ceramic that satisfies the desired crystalline phase structure and stress structure.

[0205] In some embodiments, the value of [P205]+[Al203] can be 5%, 5.1%, 5.2%, 5.3%, 5.4%, 5.5%, 5.6%, 5.7%, 5.8%, 5.9%, 6%, 5.21%, 5.47%, or 5.36%, or a value within a range having any two of these specifically enumerated values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It will be appreciated that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0206] In some embodiments of the present application, the molar percentage of B203[B203], the molar percentage of Al203[Al203], and the molar percentage of Si02[Si02] in the composition of the base glass or in the composition of the glass-ceramic or in the composition at the center of the chemically strengthened glass-ceramic or in the composition of the tensile stress layer satisfy the following relationship:

[0207] 15≤([SiO2]+2x[B2O3]) / [Al2O3]≤17, preferably 15.0≤([SiO2]+2x[B2O3]) / [Al2O3]≤16.5. By adjusting the content of SiO2, B2O3 and Al2O3 to meet a specific range, it is conducive to obtaining a glass-ceramic or chemically strengthened glass-ceramic that meets the desired intrinsic strength and stress structure.

[0208] In some embodiments, the value of ([SiO2]+2x[B2O3]) / [Al2O3] can be 15, 15.1, 15.2, 15.3, 15.4, 15.5, 15.6, 15.7, 15.8, 15.9, 16, 16.5, 17, 15.86, 15.82 or 15.95, or can be a value within a range of any two of the above specific values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as a glass-ceramic or chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0209] In the present application, "the mass percentage of eucryptite crystal phase and lithium disilicate crystal phase is higher than that of other crystal phases present in the chemically strengthened microcrystalline glass" or "eucryptite and lithium disilicate are used as the main crystal phases" or other similar expressions mean that the sum of the mass of eucryptite crystal phase and lithium disilicate crystal phase accounts for more than 80 mass percent (wt%) of all crystal phases of the chemically strengthened microcrystalline glass according to the embodiments of the present application. In some embodiments of the present application, the sum of the mass of eucryptite crystal phase and lithium disilicate crystal phase accounts for 80wt% to 100wt% of all crystal phases of the chemically strengthened microcrystalline glass, preferably, the sum of the mass of eucryptite crystal phase and lithium disilicate crystal phase accounts for 85wt% to 100wt% of all crystal phases of the chemically strengthened microcrystalline glass. In some embodiments, the sum of the mass of eucryptite crystal phase and lithium disilicate crystal phase can be 80wt%, 80.5wt%, 81wt%, 81.5wt%, 82wt%, 82.5wt%, 83wt%, 83.5wt%, 84wt%, 84.5wt%, 85wt%, 85.5wt%, 86wt%, 86.5wt%, 87wt%, 87.5wt%, 88wt%, 88.5wt%, 89wt%, 89.5wt%, 90wt%, 95wt% or 100wt% of all crystal phases of the chemically strengthened microcrystalline glass, or can be a value within a value range formed by any two specific values as endpoints, as long as a microcrystalline glass or chemically strengthened microcrystalline glass 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 a microcrystalline glass or chemically strengthened microcrystalline glass with the required properties of the present application can be obtained.

[0210] In some embodiments of the present application, the average grain size of the chemically strengthened microcrystalline glass is not more than 100nm, preferably, the average grain size is not more than 50nm, more preferably, the average grain size is 15nm to 30nm. A suitable average grain size is beneficial to make the microcrystalline glass have excellent optical properties and high intrinsic strength, and if the average grain size is too high, the microcrystalline glass is easy to lose transparency, and the chemical strengthening effect will also be affected. In the present application, by making the chemically strengthened microcrystalline glass meet a suitable average grain size, it is beneficial to ensure that the chemically strengthened microcrystalline glass realizes excellent mechanical strength performance and excellent optical performance.

[0211] In some embodiments, the average grain size of the chemically strengthened glass-ceramic can be 100 nm, 50 nm, 40 nm, 35 nm, 30 nm, 25 nm, 20 nm, 15 nm, 19.7 nm, 18.6 nm, 20.8 nm, 20.3 nm, 25.2 nm, 23.2 nm, 22.6 nm, or 10 nm, or can be a value within a range between any two of the above specifically named values as endpoints, as long as a chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It is to be understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0212] In some embodiments of the present application, the crystallinity of the chemically strengthened glass-ceramic is not less than 70%, preferably, the crystallinity of the chemically strengthened glass-ceramic is 80% to 90%, more preferably, the crystallinity of the chemically strengthened glass-ceramic is 85% to 90%. It is to be understood that in the present application, the crystallinity of the glass-ceramic does not change significantly after the glass-ceramic is chemically strengthened to obtain the chemically strengthened glass-ceramic, i.e., the crystallinity of the glass-ceramic is the same as or substantially the same as the crystallinity of the chemically strengthened glass-ceramic. The higher the crystallinity of the glass-ceramic, the more beneficial it is to obtain high mechanical strength performance and high damage resistance performance. However, if the crystallinity is too high, it is easy to affect the chemical strengthening effect of the glass-ceramic, resulting in a prolonged chemical strengthening time for preparing a chemically strengthened glass-ceramic with a high stress level, and it is also easy to affect the optical performance of the glass-ceramic. In the present application, by making the glass-ceramic meet the desired crystallinity, it is beneficial to make the chemically strengthened glass-ceramic prepared therefrom also meet the desired crystallinity, and it is more beneficial to obtain a chemically strengthened glass-ceramic that meets the desired high mechanical strength performance, high damage resistance performance, and excellent optical performance.

[0213] In some embodiments, the crystallinity of the chemically strengthened glass-ceramic can be 70%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 86.2%, 88.6%, 87.5%, 87.2%, 86.5%, or 90%, or can be a value within a range between any two of the above specifically named values as endpoints, as long as a chemically strengthened glass-ceramic having the desired properties of the present application is obtained. It is to be understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as a chemically strengthened glass-ceramic having the desired properties of the present application is obtained.

[0214] In some embodiments of the present application, the Young's modulus of the chemically strengthened glass ceramic is greater than 100 GPa, preferably, the Young's modulus is greater than 105 GPa, more preferably, the Young's modulus is 110 GPa to 120 GPa. It should be understood that in the present application, the Young's modulus of the glass ceramic does not decrease after the glass ceramic is subjected to the chemical strengthening treatment to obtain the chemically strengthened glass ceramic, that is, when the Young's modulus of the glass ceramic is greater than 100 GPa, the Young's modulus of the chemically strengthened glass ceramic obtained therefrom should also be greater than 100 GPa. A higher Young's modulus is beneficial to ensure that the chemically strengthened glass ceramic has high mechanical strength and high damage resistance.

[0215] In some embodiments, the Young's modulus of the chemically strengthened glass ceramic can be 101 GPa, 102 GPa, 103 GPa, 104 GPa, 105 GPa, 106 GPa, 107 GPa, 108 GPa, 109 GPa, 110 GPa, 111 GPa, 112 GPa, 113 GPa, 114 GPa, 115 GPa, 115.25 GPa, 115.07 GPa, 112.04 GPa, 116 GPa, 117 GPa, 118 GPa, 119 GPa or 120 GPa, or can be a value within a range defined by any two of the above specific values as endpoints, as long as a chemically strengthened glass ceramic having 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 a chemically strengthened glass ceramic having the required properties of the present application can be obtained.

[0216] In some embodiments of the present application, the b value of the chemically strengthened glass ceramic is <1.0, preferably, the b value is <0.70, more preferably, the b value is ≤0.60, when the thickness of the chemically strengthened glass ceramic is 0.3 mm to 1 mm. It should be understood that in the present application, the optical properties of the glass ceramic do not change significantly after the glass ceramic is subjected to the chemical strengthening treatment to obtain the chemically strengthened glass ceramic, that is, the b value and the transmittance of the glass ceramic are the same as or substantially the same as those of the chemically strengthened glass ceramic. In the present application, the b value refers to the optical b value measured under D65 light source, and the Konica Minolta CM-3600A is used to test the b value in the transmittance mode, and the result is shown as b(D65). A smaller b value is beneficial to ensure that the glass ceramic has a better display effect, and a larger b value will cause the glass ceramic to have an undesirable color, resulting in a display effect that cannot meet the application requirements of the display cover glass.

[0217] In some embodiments, the chemically strengthened glass-ceramics can have a b value of 0.70, 0.65, 0.60, 0.55, 0.50, 0.45, 0.40, 0.35, 0.30, 0.25, 0.32, 0.34, 0.37, 0.44, 0.26, 0.39, 0.49, 0.47, 0.59, 0.48, 0.52, or 0.20, or a value within a range defined by any two of the above values as endpoints, for a thickness of 0.3 mm to 1 mm, as long as the chemically strengthened glass-ceramics with the desired properties of the present application are obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramics with the desired properties of the present application are obtained.

[0218] In some embodiments of the present application, the chemically strengthened glass-ceramics is transparent in the visible wavelength range, preferably, the transmittance of the chemically strengthened glass-ceramics with a thickness of 0.3 mm to 1 mm is ≥ 85% for a 550 nm wavelength light, preferably, the transmittance is ≥ 90%, more preferably, the transmittance is ≥ 90.29%. The chemically strengthened glass-ceramics satisfying the transmittance can ensure good light transmittance, good transparent effect, and is suitable for use in display screens with requirements for display effect. The "visible wavelength range" herein refers to light with a wavelength of 360 nm to 740 nm.

[0219] In some embodiments, the transmittance of the chemically strengthened glass-ceramics with a thickness of 0.3 mm to 1 mm can be 85%, 90%, 90.10%, 90.20%, 90.29%, 90.30%, 90.40%, 90.50%, 91.00%, 91.04%, 91.05%, 91.08%, 91.14%, 90.69%, 90.81%, 90.86%, 90.29%, 90.77%, 90.98%, 90.90%, 90.42%, or 92.00% for a 550 nm wavelength light, or a value within a range defined by any two of the above values as endpoints, as long as the chemically strengthened glass-ceramics with the desired properties of the present application are obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramics with the desired properties of the present application are obtained.

[0220] In some embodiments of the present application, the absolute value of the slope |K 80μm | of the compressive stress curve of the chemically strengthened glass-ceramics at a depth of 80 μm is 2.5 MPa / μm ≤ |K 80μm | ≤ 4.5 MPa / μm, preferably, 3.0 MPa / μm ≤ |K 80μm | ≤ 4.5 MPa / μm.

[0221] In some embodiments, on the compressive stress curve of the chemically strengthened glass-ceramics, the absolute value of the slope at a depth of 80 μm |K 80μm The values ​​of | can be: 2.5MPa / μm, 2.6MPa / μm, 2.7MPa / μm, 2.8MPa / μm, 2.9MPa / μm, 3.0MPa / μm, 3.1MPa / μm, 3.2MPa / μm, 3.3MPa / μm, 3.4MPa / μm, 3.5MPa / μm, 3.6MPa / μm, 3.7MPa / μm, 3.8MPa / μm, 3.9MPa / μm, 4.0MPa / μm, 4.1MPa / μm, 4.2MPa / μm, 4.3MPa / μm, 4.4MPa / μm, 3.21MPa / μm, 2.55MPa / μm, 4.05MPa / μm, 3.05MPa / μm, 2.85MPa / μm, 2.81MPa / μm, 3.17MPa / μm, 3.10MPa / μm, 3.55MPa / μm, 3.85MPa / μm, 3.26MPa / μm, 3.38MPa / μm, 2.57MPa / μm, 3.78MPa / μm or 4.5MPa / μm, or it can be a value within the numerical range consisting of any two of the above specific values ​​as endpoints, as long as the chemically strengthened micro-ceramics with the performance required by the present application can be obtained. It should be understood that, in a specific embodiment, any of the above ranges can be combined with any other ranges, as long as the chemically strengthened micro-ceramics with the performance required by the present application can be obtained.

[0222] In some embodiments of the present application, a Mohs hardness pen with a Mohs hardness rating of 6 and a tip angle of 35° in horizontal projection is used. The tip of the Mohs hardness pen is vertically inserted into a chemically strengthened micro-ceramic glass having a thickness of not less than 0.35 mm along the thickness direction. When the penetration depth is 80 μm, the load F required to be applied is 80μm ≥100N, preferably, the load F to be applied 80μm ≥110N. In some embodiments, when the penetration depth is 80μm, the load F required to be applied is 80μmmay be 100 N, 105 N, 110 N, 115 N, 120 N, 125 N, 130 N, 140 N, 145 N, 150 N, 123.5 N, 110.6 N, 131.9 N, 114.4 N, 106.5 N, 125.5 N, 125.6 N, 138.6 N, 113.8 N, 137.5 N, 117.5 N, 144.8 N, 121.5 N, 103.3 N, or 102.7 N, or a value within a range defined by any two of the foregoing specific values as endpoints, as long as a chemically strengthened glass-ceramic with the desired properties of the present application is obtained. It should be understood that in specific embodiments, any of the foregoing ranges can be combined with any other range, as long as a chemically strengthened glass-ceramic with the desired properties of the present application is obtained.

[0223] In some embodiments of the present application, the chemically strengthened glass-ceramic having a thickness of not less than 0.35 mm is subjected to a sandpaper drop test, using 80 grit sandpaper, and the average sandpaper drop height is ≥ 0.8 m, preferably ≥ 1.0 m. In some embodiments, the chemically strengthened glass-ceramic having a thickness of not less than 0.35 mm has an average sandpaper drop height of 0.8 m, 0.9 m, 1.0 m, 1.08 m, 1.1 m, 1.11 m, 1.12 m, 1.13 m, 1.14 m, 1.15 m, 1.16 m, 1.17 m, 1.18 m, 1.19 m, 1.2 m, 1.25 m, 1.26 m, 1.3 m, 1.32 m, 1.35 m, 1.4 m, 1.45 m, 1.5 m, 1.55 m, 1.6 m, 1.65 m, 1.68 m, 1.7 m, 1.75 m, 1.8 m, 1.85 m, 1.9 m, 1.95 m, or 2 m, or a value within a range defined by any two of the foregoing specific values as endpoints, as long as a chemically strengthened glass-ceramic with the desired properties of the present application is obtained. It should be understood that in specific embodiments, any of the foregoing ranges can be combined with any other range, as long as a chemically strengthened glass-ceramic with the desired properties of the present application is obtained.

[0224] Having described the composition, crystalline phase structure, and stress structure of the chemically strengthened glass-ceramic, the method of making the chemically strengthened glass-ceramic is now described in detail.

[0225] In the present application, the method of making the chemically strengthened glass-ceramic includes the process of making the glass-ceramic and the process of chemical strengthening. The process of making the glass-ceramic includes the process of making the base glass and the process of heat treating the base glass (i.e., the process of making the glass-ceramic).

[0226] In the present application, the base glass can be prepared by using the forming method in the prior art, and the present application does not have any limitation in this regard. For example, the forming method of the base glass can include, but is not limited to, a float method, an overflow method, a calendering method, or a casting method. For example, the components are mixed according to the formula, and after being fused and formed, the base glass can be obtained by cooling and annealing.

[0227] For example, the raw materials (industrial raw materials) are prepared according to the formula, a refining agent is added, and then the raw material mixture is mixed for a period of time to obtain a uniformly mixed raw material mixture. The raw material mixture is placed in a platinum crucible or a furnace and heated to 1550-1650°C, preferably maintained at the melting temperature for 5h or more, and then poured into a forming mold to cool and form, preferably cooled to about 900°C, and then placed in an annealing furnace for annealing treatment, preferably at an annealing temperature of 450-500°C, preferably for 12-48h, and then cooled to room temperature in the furnace, to obtain the base glass. The person skilled in the art can select the type and amount of the refining agent according to the needs, without the need for creative labor. Further, the refining agent can include, but is not limited to, one or more of sodium chloride, tin oxide, antimony oxide, or arsenic oxide, and the amount of the refining agent can be 0-1wt% of the total amount of the raw material.

[0228] In some embodiments of the present application, the heat treatment process of the base glass can include a nucleation treatment and / or a crystallization treatment, preferably a nucleation treatment and a crystallization treatment. In some embodiments, the crystallization treatment includes a one-step crystallization treatment or a two-step crystallization treatment. In some embodiments, in order to prepare a curved microcrystalline glass, a two-step crystallization treatment can be used. When a two-step crystallization treatment is used, the second step of the crystallization treatment is to heat the crystallized glass material obtained by the first step of the crystallization treatment to a crystallization temperature and perform a 3D heat bending forming treatment.

[0229] In some embodiments of the present application, in order to obtain the desired physical and chemical properties of the microcrystalline glass, the heat treatment of the base glass can be performed in one step, or in two or more steps. If the heat treatment is performed in one step, it means that the nucleation treatment (i.e., the nucleation treatment) is not performed separately, and the nucleation and target crystal growth are directly performed in one step of temperature rising. It can be understood as directly performing the crystallization treatment. If the heat treatment is performed in two steps, it means that the nucleation treatment (i.e., the nucleation treatment) is performed first, and then the target crystal growth treatment (i.e., the crystallization treatment) is performed.

[0230] In some embodiments of the present application, in order to precipitate the desired target crystal phase in the glass-ceramics and obtain the desired physical and chemical properties, the base glass is subjected to nucleation treatment and crystallization treatment in sequence. Further, when the nucleation treatment is performed, the nucleation temperature can be 500-700°C, and the nucleation time can be 10-1440 min; when the crystallization treatment is performed, the crystallization temperature can be 600-750°C, and the crystallization time can be 5-1440 min. During the heat treatment for nucleation treatment and crystallization treatment, the heating rate is preferably controlled to be 5-15°C / min, and more preferably the heating rate is 10°C / min.

[0231] In the present application, after the heat treatment, the skilled person in the art can also perform other conventional steps to obtain the glass-ceramics sample that meets the required specifications or requirements, for example, the steps of shaping treatment, cutting treatment (such as cutting using a multi-wire saw), CNC processing (computer numerical control), thinning treatment, or polishing treatment, etc.

[0232] In the present application, the chemical strengthening treatment, i.e. ion exchange method, is performed by immersing the glass-ceramics in a molten salt bath, so that the alkali metal ions with smaller ionic radius in the glass-ceramics are exchanged with the alkali metal ions with larger ionic radius in the molten salt bath, thereby forming a compressive stress layer on the surface of the glass-ceramics, and obtaining the chemical strengthened glass-ceramics with better mechanical properties.

[0233] In some embodiments of the present application, the chemical strengthening treatment can be performed by single-step strengthening method or multi-step strengthening method. The molten salt bath used in the chemical strengthening treatment is a molten salt bath containing sodium salt and / or potassium salt. Preferably, the molten salt bath used in the chemical strengthening treatment of the present application is a mixed molten salt bath containing sodium salt and potassium salt, and the temperature of the molten salt bath is preferably 380-550°C. In some embodiments of the present application, the concentration of potassium salt in the salt bath is preferably 1wt%-95wt%, the concentration of sodium salt is 5wt%-99wt%, and more preferably a certain amount (such as 0.01wt%-0.3wt%) of lithium salt is added to the salt bath. In some embodiments of the present application, the time for chemical strengthening treatment is preferably 0.1-24h. The sodium salt can be selected from at least one of sodium nitrate, sodium sulfate, and sodium carbonate, and is preferably sodium nitrate; the potassium salt can be selected from at least one of potassium nitrate, potassium sulfate, and potassium carbonate, and is preferably potassium nitrate; and the lithium salt can be selected from at least one of lithium nitrate, lithium sulfate, and lithium carbonate, and is preferably lithium nitrate.

[0234] The chemically strengthened microcrystalline glass provided in the present application has excellent performance, and can be used in electronic devices, including but not limited to mobile phones, tablet computers, handheld game consoles, portable digital devices (such as digital cameras), vehicle-mounted central control, electronic whiteboard glass, smart home, smart wear (such as smart bracelet, smart watch, smart glasses), and can also be used in vehicles, aircraft or vessels, and can also be used in any glass device that needs chemically strengthened microcrystalline glass. For example, it can be used in the display screen, cover glass, touch screen, glass inner screen or inner frame of an electronic device; for example, it can be used in the windshield of a vehicle, aircraft or vessel, such as the front windshield or side windshield. For example, it can be used in worktops, other surfaces, appliance doors, floor tiles, wall panels or storage containers. Other surfaces can include but are not limited to exterior wall surfaces, stair tread surfaces, column facings or counter surfaces, and storage containers can include but are not limited to cups, plates, medicine bottles or beverage bottles.

[0235] For example, the chemically strengthened microcrystalline glass provided in the present application has excellent performance, and can be used to manufacture glass devices. The glass devices referred to herein can be regular or irregular, and those skilled in the art can manufacture them according to needs.

[0236] For example, the chemically strengthened microcrystalline glass provided in the present application has excellent performance, and can be used to manufacture cover glass, which can be a display screen cover, back cover or camera protection cover of an electronic device. For example, the chemically strengthened microcrystalline glass provided in the present application has excellent performance, and can be used in electronic devices. Referring to FIGS. 9, 10 and 11, the present application provides an electronic device, which can be a mobile phone, a tablet computer, a smart wearable device or the like, and the electronic device includes a housing 1 assembled on the outside of the electronic device, and a circuit board, a battery and the like components located inside the housing 1. The housing 1 includes a display screen cover 11 assembled on the front side and a back cover 12 assembled on the back side, and the display screen cover 11 is covered on the display module 4. The display screen cover 11 and / or the back cover 12 can be made of the aforementioned chemically strengthened microcrystalline glass. In the present application, the display screen cover 11 and the back cover 12 can be made of the aforementioned chemically strengthened microcrystalline glass, or only partially made of the aforementioned chemically strengthened microcrystalline glass. In the present application, the display screen can be a touch display screen, and the display screen cover 11 can be a protective cover plate arranged on the touch display screen. In the present application, the back cover 12 can cover only the back side of the electronic device (and the side away from the display screen), or can cover the back side and the side frame of the electronic device. Optionally, the back cover 12 can cover all the side frames around the electronic device, or can cover part of the side frames.

[0237] In some embodiments of the present application, as shown in FIG. 10, the electronic device further comprises a camera assembly 2 located inside the shell 1, and the shell 1 can comprise a camera protective cover plate 13 covering the camera assembly 2 for protecting the camera assembly 2, and the camera protective cover plate 13 is made of the aforementioned chemically strengthened microcrystalline glass. In embodiments of the present application, the camera protective cover plate 13 can be partially made of the aforementioned chemically strengthened microcrystalline glass, or can be entirely made of the aforementioned chemically strengthened microcrystalline glass. In embodiments of the present application, the camera protective cover plate 13 can be located on the front side of the electronic device, or can be located on the back side of the electronic device. In some embodiments of the present application, the camera protective cover plate 13 can be in a separate structure from the display screen cover plate 11 or the back cover 12. In other embodiments of the present application, the camera protective cover plate 13 can be in an integrated structure with the display screen cover plate 11 or the back cover 12.

[0238] In some embodiments of the present application, as shown in FIG. 11, the electronic device further comprises a middle frame 3 located between the display module 4 and the shell 1, and the middle frame 3 can comprise the aforementioned chemically strengthened microcrystalline glass.

[0239] In embodiments of the present application, the display screen cover plate, the back cover, the camera protective cover plate, and the middle frame of the electronic device can be any one of the four made of the aforementioned chemically strengthened microcrystalline glass, or any two of the four made of the aforementioned chemically strengthened microcrystalline glass, or all three of the four made of the aforementioned chemically strengthened microcrystalline glass, or all four of the four made of the aforementioned chemically strengthened microcrystalline glass.

[0240] The technical solutions of the present application are further described in detail below in conjunction with examples. The examples of the present application described in detail below are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0241] Example 1

[0242] I. Preparation of base glass

[0243] The raw materials were prepared according to the proportions of each oxide in Table 1, and the total mass of the prepared raw materials was 1000g. 5g of sodium chloride (NaCl) was added to the prepared raw materials, and then the V-type mixer was used for mixing for more than 30 minutes to obtain a uniformly mixed raw material mixture.

[0244] The uniformly mixed raw material mixture was transferred to a platinum crucible, and then melted in a 1600℃ lifting furnace for 5 hours. After that, the mixture was poured into a forming mold for cooling, and cooled to about 900℃. Then, the mixture was placed in a 470℃ annealing furnace for annealing for 12 hours, and then cooled to room temperature in the furnace. Thus, a base glass brick was obtained.

[0245] II. Preparation of microcrystalline glass

[0246] The base material glass brick is subjected to nucleation treatment and crystallization treatment in sequence, so that a transparent microcrystalline glass sample brick is prepared. The composition of the prepared microcrystalline glass is the same as that of the base material glass, and is shown in Table 1 in terms of mole percentage of oxides.

[0247] In order to obtain the microcrystalline glass product of Example 1, the nucleation temperature is 570℃ and the nucleation treatment time is 240 min when the nucleation treatment is performed at a temperature increasing rate of 10℃ / min; the crystallization temperature is 715℃ and the crystallization treatment time is 90 min when the crystallization treatment is performed at a temperature increasing rate of 10℃ / min. The nucleation treatment time herein refers to the time for keeping the temperature of the crystallization furnace at the set nucleation temperature. The crystallization treatment time herein refers to the time for keeping the temperature of the crystallization furnace at the set crystallization temperature.

[0248] The obtained microcrystalline glass sample brick is subjected to cold processing treatment of cutting, CNC processing (the CNC instrument equipment used in the present application is of RCG500S type), and polishing in sequence, so that a microcrystalline glass sample meeting the required specifications and requirements is prepared. In the present application, the microcrystalline glass sample brick is subjected to the aforementioned cold processing treatment, so that a microcrystalline glass polished sheet sample having a length and width of 50mm x 50mm and a thickness of 0.4mm-0.70mm is prepared, and the details are shown in Table 3.

[0249] III. Preparation of chemically strengthened microcrystalline glass

[0250] The obtained microcrystalline glass polished sheet is subjected to one-step chemical strengthening treatment in a mixed salt at 500℃, and the strengthening time is 5.0h. The composition of the mixed salt is: 98.97wt% NaNO3+1.0wt% KNO3+0.03wt% LiNO3.

[0251] After the chemical strengthening treatment, the microcrystalline glass sample is taken out and slowly cooled to room temperature on the furnace body of the strengthening furnace, and then the salt wrapped on the surface of the microcrystalline glass is washed away with clean water. After drying treatment of the microcrystalline glass sample, the chemically strengthened microcrystalline glass is obtained.

[0252] Test conditions of the microcrystalline glass or chemically strengthened microcrystalline glass obtained in Example 1:

[0253] The crystalline phase composition, crystallinity, average grain size, optical b value, transmittance (under 550nm wavelength light), thermal expansion softening point, density, refractive index, and Young's modulus of the microcrystalline glass sample are tested respectively, and the results are shown in Table 2.

[0254] The thickness T, DOL_0, CS_80, |CT_AV|, CT_LD, DOL_0 / T, the value of formula A, the value of formula B, F and the average sandpaper drop height of the chemically strengthened glass ceramic sample were respectively tested or calculated according to the test results. |K 80μm |、 the value of formula A, the value of formula B, F 80μm and the average sandpaper drop height, and the results are shown in Table 3, respectively.

[0255] The XRD pattern of the glass ceramic of Example 1 is shown in FIG. 1, and the comparison of the XRD patterns of the glass ceramic of Example 1 and the chemically strengthened glass ceramic is shown in FIG. 2. As can be seen from FIG. 1 and FIG. 2, in the present application, the main crystal phases in the glass ceramic and the chemically strengthened glass ceramic are both lithium disilicate crystal phase and petalite crystal phase, and the crystal phase structure of the glass ceramic does not change obviously before and after the chemical strengthening treatment.

[0256] The transmittance curve of the glass ceramic of Example 1 is shown in FIG. 3, and the comparison of the transmittance curves of the glass ceramic of Example 1 and the chemically strengthened glass ceramic is shown in FIG. 4. As can be seen from FIG. 3 and FIG. 4, in the present application, the glass ceramic and the chemically strengthened glass ceramic are both transparent in the visible light range, and both have high transmittance, and the transmittance of the glass ceramic does not change obviously before and after the chemical strengthening treatment.

[0257] Examples 2-13

[0258] They are respectively carried out with reference to Example 1, except that the thickness, optical results, strengthening process and stress test results after strengthening are different, as shown in Tables 2-3, respectively.

[0259] Examples 14-15

[0260] They are respectively carried out with reference to Example 1, except that the composition, thickness, optical results, stress test results after strengthening are different, as shown in Tables 1-3, respectively.

[0261] Comparative Examples 1-6

[0262] They are respectively carried out with reference to Example 1, except that the thickness, optical results, strengthening process and stress test results after strengthening are different, as shown in Tables 2-3, respectively.

[0263] The surface compressive stress curve (or also known as compressive stress curve) of Example 3 and Comparative Example 2 is shown in FIG. 7, and as can be seen from the figure, the area enclosed by the compressive stress curve of the chemically strengthened glass ceramic provided by Example 1, the straight line y=0, the straight line x=0 and the straight line x=80 μm is greater than that of Comparative Example 2, so the integral area of the compressive stress curve of the chemically strengthened glass ceramic provided by Example 1 in the interval range of h∈[0 μm, 80 μm] is greater than that of Comparative Example 2.

[0264] The chemically strengthened glass-ceramics of Example 3 and Comparative Example 2 were subjected to the anti-penetration test using the M6 Mohs hardness pen, and the relationship between the penetration depth and the applied force is shown in FIG. 8. As can be seen from the figure, the chemically strengthened glass-ceramics of Example 3 required a significantly greater force to penetrate 80 μm in depth than Comparative Example 2.

[0265] Table 1

[0266] Note: The oxide content of "0" in Table 1 means that the component is not intentionally or deliberately added to the glass composition during the initial batching process, but the component can exist as an impurity. The content in the table is the percentage of the oxide content in moles, which is not involved in the calculation of the formula.

[0267] Table 2

[0268] Table 3

[0269] As can be seen from the above-described Examples and Comparative Examples of Tables 1-3, compared with the comparative examples, by using the embodiment of the present application, by making the chemically strengthened glass-ceramics satisfy the specific crystal phase structure, making the glass-ceramics form a microstructure with lithium disilicate and petalite as the main crystal phase, and making the thickness and stress structure of the chemically strengthened glass-ceramics satisfy specific requirements, not only excellent optical properties (such as high transmittance and low b value) and high intrinsic strength (such as high Young's modulus) are endowed to the chemically strengthened glass-ceramics, but also the chemically strengthened glass-ceramics of different thicknesses simultaneously have excellent anti-penetration ability of sharp objects and excellent anti-drop damage performance of rough surfaces, which can meet the application requirements of cover glass. The chemically strengthened glass-ceramics of the present application better realizes the synergistic cooperation between thickness, crystal phase structure and stress structure, and can better improve the damage resistance of the chemically strengthened glass-ceramics, especially can ensure that the chemically strengthened glass-ceramic product has excellent anti-penetration ability of sharp objects and excellent anti-drop damage performance of rough surfaces. In addition, the chemically strengthened glass-ceramics of the present application also has excellent anti-penetration ability of sharp objects and excellent anti-drop damage performance of rough surfaces even when the thickness is thin, which can reduce the probability of damage to the screen of electronic equipment, ensure the beauty of the screen, and thus can meet the market demand for large screen and thin and light electronic equipment.

[0270] In the schemes of Comparative Examples 1-6, the thickness and stress structure of the chemically strengthened microcrystalline glass do not meet the specific requirements of the present application, and finally, the chemically strengthened microcrystalline glass prepared in the schemes of the comparative examples cannot simultaneously meet the excellent sharp object penetration resistance and excellent rough surface drop damage performance.

[0271] The above merely provides specific examples of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. Industrial applicability

[0272] The present application better realizes the coordination among the thickness, crystalline phase structure and stress structure by making the chemically strengthened microcrystalline glass meet the specific crystalline phase structure and making the thickness and stress structure of the chemically strengthened microcrystalline glass meet the specific requirements, can better improve the damage resistance of the chemically strengthened microcrystalline glass, realizes that the chemically strengthened microcrystalline glass under different thicknesses can all meet the high strength performance requirements, and can ensure that the chemically strengthened microcrystalline glass under different thicknesses all have excellent sharp object penetration resistance and excellent rough surface drop damage performance. Especially for the case of thinner thickness, the chemically strengthened microcrystalline glass provided by the present application improves the problem that the sharp object penetration resistance and rough surface drop damage resistance of the existing chemically strengthened microcrystalline glass need to be improved after the thickness is thinned, and endows the ultrathin chemically strengthened microcrystalline glass with excellent sharp object penetration resistance and excellent rough surface drop damage performance. At the same time, the chemically strengthened microcrystalline glass of the present application maintains excellent optical performance and can meet the application requirements of cover plate glass.

Claims

1. A chemically strengthened glass-ceramic, characterized in that: The chemically strengthened glass-ceramics comprises a petalite crystalline phase and a lithium disilicate crystalline phase, wherein the petalite crystalline phase and the lithium disilicate crystalline phase have a higher mass percentage than other crystalline phases present in the chemically strengthened glass-ceramics; The chemically strengthened glass-ceramics has a compressive stress layer on the surface and tensile stress inside; the chemically strengthened glass-ceramics satisfies: 90μm≤DOL_0; The value of A ranges from 5 to 15; Where: T is the thickness of the chemically strengthened glass-ceramics, in mm; t is the depth from the main surface of the chemically strengthened glass-ceramics, CS(t) is the compressive stress value at the depth t, MPa·μm is the integral of the compressive stress from any major surface of the chemically strengthened glass-ceramics to a compressive stress layer at a depth of 80 μm from the major surface. Formula A is calculated by substituting data according to the aforementioned units, and the result is obtained. The units are not involved in the calculation.

2. The chemically strengthened glass-ceramics according to claim 1, wherein: The chemically strengthened glass-ceramics satisfies: B = |CT_AV| × DOL_0 × (1000 × T 2.8 -2×DOL_0×T 1.8 ) / 1000, the value of B is 550~3500; Wherein, T is the thickness of the chemically strengthened glass-ceramics, in mm; |CT_AV| is the absolute value of the average tensile stress, in MPa; DOL_0 is the depth of the compressive stress layer, in μm. In formula B, the data is substituted into the calculation according to the above unit requirements to obtain the calculation result, and the unit is not involved in the calculation.

3. The chemically strengthened glass-ceramics according to claim 1 or 2, characterized in that: The thickness T of the chemically strengthened glass-ceramics is ≤1 mm. Preferably, the thickness T of the chemically strengthened glass-ceramics is 0.3 mm to 1 mm. More preferably, the thickness T of the chemically strengthened glass-ceramics is 0.35 mm to 0.7 mm.

4. The chemically strengthened glass-ceramics according to any one of claims 1 to 3, characterized in that The chemically strengthened glass-ceramics meets the following requirements: Preferably, More preferably, 5. The chemically strengthened glass-ceramics according to any one of claims 1 to 4, characterized in that The chemically strengthened glass-ceramics meets the following requirements: 70 MPa≤|CT_AV|≤160 MPa, preferably, 77 MPa≤|CT_AV|≤160 MPa, more preferably, 110 MPa≤|CT_AV|≤150 MPa, wherein |CT_AV| is the absolute value of the average tensile stress; and / or, 0.17≤DOL_0 / T≤0.25, preferably, 0.18≤DOL_0 / T≤0.25; and / or, 50000 MPa / mm≤CT_LD≤80000 MPa / mm, preferably, 55000 MPa / mm≤CT_LD≤80000 MPa / mm, more preferably, 61000 MPa / mm≤CT_LD≤75000 MPa / mm, wherein CT_LD is the tensile stress linear density; and / or, 90 μm≤DOL_0, preferably, 90 μm≤DOL_0≤200 μm, more preferably, 95 μm≤DOL_0≤150 μm, wherein DOL_0 is the depth of the compressive stress layer.

6. The chemically strengthened glass-ceramics according to any one of claims 1 to 5, characterized in that The chemically strengthened glass-ceramics meets the following requirements: The value of T is 0.475 mm, 0.505 mm, 0.545 mm, 0.590 mm, 0.620 mm, 0.650 mm, 0.500 mm or 0.400 mm; and / or, The value of A is: 7.635, 5.809, 9.060, 5.907, 5.426, 7.067, 6.609, 9.628, 5.999, 9.782, 6.541, 12.510, 6.503, 5.806 or 5.430; and / or, The value of B is: 955.0, 877.3, 1175.9, 1043.3, 1209.0, 1320.5, 1398.7, 1989.5, 1621.4, 2339.9, 1729.7, 2879.3, 995.6, 895.9 or 562.9; and / or, The value of is: 23322.83 MPa·μm, 17745.62 MPa·μm, 25245.12 MPa·μm, 16459.20 MPa·μm, 13485.35 MPa·μm, 17564.52 MPa·μm, 14582.65 MPa·μm, 21245.19 MPa·μm, 12287.36 MPa·μm, 20036.85 MPa·μm, 12482.65 MPa·μm, 23872.85 MPa·μm, 18393.52 MPa·μm, 16421.45 MPa·μm or 21464.39 MPa·μm; and / or, The values ​​of DOL_0 are: 111.48μm, 110.32μm, 113.85μm, 114.65μm, 113.82μm, 124.84μm, 116.25μm, 1 29.90μm, 114.26μm, 136.58μm, 115.54μm, 144.85μm, 109.58μm, 108.86μm or 98.00μm; and / or, the value of |CT_AV| is: 129.8 MPa, 119.4 MPa, 127.4 MPa, 112.9 MPa, 99.8 MPa, 106.8 MPa, 87.0 MPa, 119.9 MPa, 85.7 MPa, 116.8 MPa, 77.6 MPa, 119.8 MPa, 112.66 MPa, 101.5 MPa or 146.5 MPa; and / or, The value of DOL_0 / T is: 0.25, 0.23, 0.21, 0.20, 0.22, 0.19 or 0.18; and / or, The values ​​of CT_LD are: 68873.25MPa / mm, 63938.07MPa / mm, 69956.48MPa / mm, 61636.69MPa / mm, 58114.73MPa / mm, 57871.88MPa / mm, 52716.10MPa / mm, 67103.36MPa / mm, 54112.64MPa / mm, 65328.99MPa / mm, 50012.60MPa / mm, 66406.06MPa / mm, 63278.87MPa / mm, 57316.32MPa / mm or 74715.00MPa / mm.

7. The chemically strengthened glass-ceramics according to any one of claims 1 to 6, wherein Measured in terms of molar percentage of oxides, the composition of the center or the tensile stress layer of the chemically strengthened glass-ceramics comprises: SiO2: 64% ~ 70%, Al2O3: 3.5% ~ 5.0%, P2O5: 0.7% ~ 1.5%, ZrO2: 1.5% ~ 3%, Na2O: 0 ~ 3%, K2O: 0 ~ 1%, Li2O: 20% ~ 26%, CaO: 0 ~ 1.5%, B2O3: 0 ~ 2%.

8. The chemically strengthened glass-ceramics according to any one of claims 1 to 7, wherein Measured in terms of molar percentage of oxides, the composition of the center or the tensile stress layer of the chemically strengthened glass-ceramics comprises: The molar percentage of SiO2 is 64% to 69.5%, preferably, the molar percentage of SiO2 is 67.5% to 69.5%; and / or, The molar percentage of Al2O3 is 4% to 4.8%, preferably, the molar percentage of Al2O3 is 4% to 4.5%; and / or, The molar percentage of P2O5 is 0.8% to 1.5%, preferably, the molar percentage of P2O5 is 0.8% to 1.2%; and / or, The molar percentage of ZrO2 is 2.5% to 3%, preferably, the molar percentage of ZrO2 is 2.6% to 3%; and / or, The molar percentage of Na2O is 0-2%, preferably, the molar percentage of Na2O is 0-1%; and / or, The molar percentage of K2O is 0 to 0.5%, preferably, the molar percentage of K2O is 0 to 0.3%; and / or, The molar percentage of Li2O is 20.5% to 25%, preferably, the molar percentage of Li2O is 20.5% to 23.5%; and / or, The molar percentage of CaO is 0% to 1%, preferably, the molar percentage of CaO is 0.5% to 1%; and / or, The molar percentage of B2O3 is 0-1%, and preferably, the molar percentage of B2O3 is 0%-0.8%.

9. The chemically strengthened glass-ceramics according to any one of claims 1 to 8, characterized in that The composition of the center or tensile stress layer of the chemically strengthened glass-ceramics, measured in molar percentage of oxides, comprises: The molar percentage of SiO2 is 68.02%, 64.39% or 68.74%; and / or, The molar percentage of Al2O3 is 4.30%, 4.07% or 4.41%; and / or, The molar percentage of P2O5 is 1.17%, 1.14% or 0.95%; and / or, The molar percentage of ZrO2 is 2.88%, 2.98% or 2.89%; and / or, The molar percentage of Na2O is 0.15%, 0.78% or 0%; and / or, The molar percentage of K2O is 0.07% or 0%; and / or, The molar percentage of Li2O is 22.40%, 25.68% or 21.48%; and / or, The molar percentage of CaO is 0.89%, 0.93% or 0.73%; and / or, The molar percentage of B2O3 is 0.08%, 0.8% or 0%.

10. The chemically strengthened glass-ceramics according to any one of claims 1 to 9, characterized in that In the composition of the center or tensile stress layer of the chemically strengthened glass-ceramics, the molar percentage of ZrO2 [ZrO2], the molar percentage of CaO [CaO], the molar percentage of P2O5 [P2O5], the molar percentage of Na2O [Na2O], the molar percentage of K2O [K2O], the molar percentage of B2O3 [B2O3], the molar percentage of Al2O3 [Al2O3] and the molar percentage of SiO2 [SiO2] satisfy the following relationship: 3.5%≤([ZrO2]+[CaO]+[P2O5]) / EXP([Na2O]+[K2O]+[B2O3])≤5.5%, preferably, 4.5%≤([ZrO2]+[CaO]+[P2O5]) / EXP([Na2O]+[K2O]+[B2O3])≤5%; and / or 5%≤[P2O5]+[Al2O3]≤6%, preferably, 5.2%≤[P2O5]+[Al2O3]≤5.5%; and / or 15≤([SiO2]+2×[B2O3]) / [Al2O3]≤17, preferably, 15≤([SiO2]+2×[B2O3]) / [Al2O3]≤16.

5.

11. The chemically strengthened glass-ceramics according to any one of claims 1 to 10, characterized in that In the composition of the center or tensile stress layer of the chemically strengthened glass-ceramics, the molar percentage of ZrO2 [ZrO2], the molar percentage of CaO [CaO], the molar percentage of P2O5 [P2O5], the molar percentage of Na2O [Na2O], the molar percentage of K2O [K2O], the molar percentage of B2O3 [B2O3], the molar percentage of Al2O3 [Al2O3] and the molar percentage of SiO2 [SiO2] satisfy the following relationship: The value of ([ZrO2]+[CaO]+[P2O5]) / EXP([Na2O]+[K2O]+[B2O3]) is 4.97% or 4.53%; and / or, The value of [P2O5]+[Al2O3] is 5.21%, 5.47% or 5.36%; and / or The value of ([SiO2]+2×[B2O3]) / [Al2O3] is 15.86, 15.82 or 15.

95.

12. The chemically strengthened glass-ceramics according to any one of claims 1 to 11, characterized in that The sum of the mass of the petalite crystal phase and the lithium disilicate crystal phase accounts for more than 80wt% of all the crystal phases of the chemically strengthened glass-ceramics. Preferably, the total mass of the petalite crystal phase and the lithium disilicate crystal phase accounts for 85 wt % to 100 wt % of all crystal phases of the chemically strengthened glass-ceramics.

13. The chemically strengthened glass-ceramics according to any one of claims 1 to 12, characterized in that In the chemically strengthened glass-ceramics, the average grain size does not exceed 100 nm, preferably, the average grain size does not exceed 50 nm, and more preferably, the average grain size is 15 to 30 nm; and / or The chemically strengthened glass-ceramics has a crystallinity of not less than 70%. Preferably, the chemically strengthened glass-ceramics has a crystallinity of 80% to 90%. More preferably, the chemically strengthened glass-ceramics has a crystallinity of 85% to 90%.

14. The chemically strengthened glass-ceramics according to any one of claims 1 to 13, characterized in that The Young's modulus of the chemically strengthened glass-ceramics is greater than 100 GPa, preferably greater than 105 GPa, and more preferably between 110 GPa and 120 GPa.

15. The chemically strengthened glass-ceramics according to any one of claims 1 to 14, characterized in that When the thickness of the chemically strengthened glass-ceramics is 0.3 mm to 1 mm, the b value is less than 1.0, preferably, the b value is less than 0.70, and more preferably, the b value is ≤ 0.60; and / or The chemically strengthened microcrystalline glass is transparent in the visible light wavelength range. Preferably, for light with a wavelength of 550nm, the transmittance of the chemically strengthened microcrystalline glass with a thickness of 0.3mm to 1mm is ≥85%, preferably, the transmittance is ≥90.00%, and more preferably, the transmittance is ≥90.29%.

16. The chemically strengthened glass-ceramics according to any one of claims 1 to 15, characterized in that On the compressive stress curve of the chemically strengthened glass-ceramics, the absolute value of the slope at a depth of 80 μm |K 80μm |Satisfy 2.5MPa / μm≤|K 80μm |≤4.5MPa / μm, preferably 3.0MPa / μm≤|K 80μm |≤4.5MPa / μm.

17. The chemically strengthened glass-ceramics according to any one of claims 1 to 16, characterized in that On the compressive stress curve of the chemically strengthened glass-ceramics, the absolute value of the slope at a depth of 80 μm |K 80μm | is 3.21MPa / μm, 2.55MPa / μm, 4.05MPa / μm, 3.05MPa / μm, 2.85MPa / μm, 2.81MPa / μm, 3.17MPa / μm, 3.10 MPa / μm, 3.55MPa / μm, 3.00MPa / μm, 3.85MPa / μm, 3.26MPa / μm, 3.38MPa / μm, 2.57MPa / μm or 3.78MPa / μm.

18. The chemically strengthened glass-ceramics according to any one of claims 1 to 17, characterized in that A Mohs hardness pen with a Mohs hardness rating of 6 and a tip angle of 35° in horizontal projection is used to vertically penetrate the chemically strengthened micro-ceramic glass having a thickness of not less than 0.35 mm along the thickness direction. When the penetration depth is 80 μm, the load F required to be applied is: 80μm ≥100N, preferably, the load F to be applied 80μm ≥110N; and / or, The chemically strengthened glass-ceramics with a thickness of not less than 0.35 mm is subjected to a sandpaper drop resistance test. The sandpaper used is 80-mesh sandpaper. The average sandpaper drop resistance height of the chemically strengthened glass-ceramics is ≥0.8 m. Preferably, the average sandpaper drop resistance height of the chemically strengthened glass-ceramics is ≥1.0 m.

19. A cover glass, characterized in that: The cover glass is made of the chemically strengthened glass-ceramics according to any one of claims 1 to 18.

20. An electronic device, characterized in that: The electronic device comprises the chemically strengthened glass-ceramics according to any one of claims 1 to 18.

21. The electronic device according to claim 20, characterized in that The electronic device includes a housing assembled on the outside of the electronic device and a circuit board located inside the housing, wherein the housing includes the chemically strengthened glass-ceramics according to any one of claims 1 to 18.

22. The electronic device according to claim 21, wherein: The housing includes a display cover assembled on the front side of the electronic device, and the display cover includes the chemically strengthened micro-ceramic glass according to any one of claims 1 to 18.

23. The electronic device according to claim 21 or 22, characterized in that: The housing includes a back cover assembled on the back side of the electronic device, and the back cover includes the chemically strengthened glass-ceramic according to any one of claims 1 to 18.

24. The electronic device according to any one of claims 21 to 23, characterized in that: The electronic device also includes a camera assembly located inside the housing, the housing includes a camera protection cover, the camera protection cover is covered on the camera assembly, and the camera protection cover includes the chemically strengthened microcrystalline glass according to any one of claims 1 to 18.

25. The electronic device according to any one of claims 21 to 24, characterized in that: The electronic device further includes a middle frame, and the middle frame includes the chemically strengthened micro-ceramic glass according to any one of claims 1 to 18.

26. A glass device, characterized in that: The glass device comprises the chemically strengthened glass-ceramic according to any one of claims 1 to 18.

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