Chemically strengthened microcrystalline glass, cover glass, electronic device, and glass device

Abstract

The present application relates to the technical field of microcrystalline glass, and provides chemically strengthened microcrystalline glass, cover glass, an electronic device, and a glass device. By making the tensile stress linear density value of the chemically strengthened microcrystalline glass and the ratio of the stress integral of the tensile stress layer close to a middle position to a thickness t satisfy a specific difference relationship, it can be ensured that the internal stress distribution of the chemically strengthened microcrystalline glass is safer while ensuring that the chemically strengthened microcrystalline glass has a high overall stress level, thereby helping to maintain the chemically strengthened microcrystalline glass in a safe stress state.

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 application No. 202411386934.3, filed on September 30, 2024, in the China Patent Office, and entitled “Chemically strengthened glass-ceramics, cover glass, electronic device and glass article”, the entire content of which is incorporated herein by reference. 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] Lithium disilicate glass-ceramics is a kind of glass-ceramics with lithium disilicate as the main crystalline phase. In the interior of the glass-ceramics, lithium disilicate crystals form a random interlocking microstructure, which forces the path of a crack to twist when it passes through the crystals, thereby helping to stop the propagation of the crack and improve the strength and fracture toughness of the glass-ceramics. In addition, the optical refractive index of lithium disilicate crystals is close to that of the glass matrix, making it an ideal crystalline phase for preparing high-transparency glass-ceramics. Therefore, lithium disilicate glass-ceramics has great application potential in the cover glass market of electronic devices.

[0005] With the continuous development of the industry, the design demand for ultra-thin electronic devices is increasingly prominent, and it is also expected that the glass used as a cover glass in electronic devices (such as mobile phones, watches, PADs, etc.) is as thin as possible. Therefore, in order to meet the use requirements of electronic devices, such as meeting the high performance requirements of anti-falling, anti-pressure, scratch resistance, wear resistance, etc., it is usually necessary to chemically strengthen the glass used as a cover glass to prepare a strengthened glass-ceramics with a certain stress level. The stress level obtained in combination with its own inherent strength can resist the action of external forces on the strengthened glass-ceramics when it is subjected to external forces, thereby preventing the strengthened glass-ceramics from being damaged, to further improve its anti-damage performance. Superior anti-damage performance often requires the cover glass to have a high stress level.

[0006] In view of this, the present application is proposed. SUMMARY

[0007] Without being limited by any theory, the inventors have found that, for lithium disilicate glass-ceramics with high lithium content, the improvement of the overall stress level does not necessarily ensure excellent damage resistance. If only the overall stress level is focused on during strengthening, without focusing on the stress distribution, the stress distribution in the prepared chemically strengthened glass-ceramics is often inappropriate, resulting in the phenomenon of "reduced strengthening stability", and the tensile stress in a certain region of the chemically strengthened glass-ceramics is too large when the overall stress level is improved. Such stress distribution structure not only cannot ensure excellent damage resistance of the chemically strengthened glass-ceramics, but also brings safety hazards, leading to explosive cracking of the chemically strengthened glass-ceramics under slight impact, small fragments flying everywhere, and even self-explosion, which seriously affects the reliability of the chemically strengthened glass-ceramics product and seriously affects the personal safety of the user.

[0008] Therefore, for glass-ceramics with lithium disilicate as the main crystal phase, the present application makes the prepared chemically strengthened glass-ceramics meet specific stress characteristics, so that the chemically strengthened glass-ceramics has a specific stress distribution structure, and the chemically strengthened glass-ceramics has high safety performance while ensuring the improvement of the mechanical strength performance and the improvement of the damage resistance.

[0009] The present application provides a chemically strengthened glass-ceramics and a cover glass, an electronic device and a glass device comprising the same, which meets specific crystal phase structure and stress distribution structure, so that the chemically strengthened glass-ceramics has excellent damage resistance (such as excellent drop damage resistance) and high safety performance. The "high safety performance" mainly reflects that the chemically strengthened glass-ceramics produces relatively large fragments when it is broken by drop impact, and does not form a large number of small fragments that can fly everywhere, so that safety hazards can be avoided. When the chemically strengthened glass-ceramics is used as a cover glass of a display screen, it can also meet the emergency use demand after drop breakage.

[0010] Specifically, the technical solutions provided by the present application include:

[0011] In a first aspect, a chemically strengthened glass-ceramics is provided, which comprises lithium disilicate crystal phase, wherein the lithium disilicate crystal phase has a higher mass percentage than other crystal phases present in the chemically strengthened glass-ceramics;

[0012] The surface of the chemically strengthened glass-ceramics has a compressive stress layer, and has a tensile stress layer inside;

[0013] The chemically strengthened glass-ceramics meets the following relationship:

[0014] A≥49500, preferably A≥50000, more preferably A≥51000, more preferably the value of A is 49500-65000;

[0015] CT_LD≥60000 MPa / mm, wherein CT_LD is the tensile stress linear density, and the unit is MPa / mm,

[0016] t is the thickness of the chemically strengthened glass-ceramic, and the unit is mm,

[0017] is the ratio of the stress integral of the tensile stress layer from the position 2*DOL_0 away from the main surface of the chemically strengthened glass-ceramic to the position at half the thickness of the chemically strengthened glass-ceramic to the thickness t, and the unit is MPa / mm, wherein x is the depth away from the main surface of the chemically strengthened glass-ceramic,

[0018] In the relationship A, 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, and the value of A represents the tensile stress linear density (in this application, the value of the tensile stress linear density is basically the ratio of the definite integral of the tensile stress curve to the thickness of the chemically strengthened glass-ceramic) minus the ratio of the stress integral of the tensile stress layer from the position 2*DOL_0 away from the main surface of the chemically strengthened glass-ceramic to the position at half the thickness of the chemically strengthened glass-ceramic to the thickness t.

[0019] The chemically strengthened glass-ceramic of the present application has a specific difference relationship between the tensile stress linear density value of the chemically strengthened glass-ceramic with the main crystal phase being lithium disilicate crystal phase and the ratio of the stress integral of the tensile stress layer close to the middle position to the thickness t, so that the chemically strengthened glass-ceramic satisfies a specific stress distribution structure, and in the case of ensuring that the chemically strengthened glass-ceramic has a relatively high overall stress level, the internal stress distribution of the chemically strengthened glass-ceramic can be ensured to be safer, thereby benefiting the chemically strengthened glass-ceramic to maintain a safe stress state. The chemically strengthened glass-ceramic of the present application not only has excellent damage resistance, such as excellent drop damage resistance, but also has high safety performance, and when it encounters impact breakage, relatively large fragments are generated, and a large number of small fragments that are easy to fly around are not formed, so that safety hazards can be avoided, and the emergency use demand can also be met after breakage.

[0020] In some embodiments of the present application, the chemically strengthened glass-ceramic satisfies the following relationship:

[0021] B=[|CT_AV|×(t / 2-DOL_0)]×[5×M K2O / (5×M K2O +0.5×M Na2OB ≥ 9000 MPa·μm, preferably B ≥ 9100 MPa·μm, more preferably B ≥ 9200 MPa·μm, more preferably B has a value of 9000 MPa·μm to 13000 MPa·μm;

[0022] wherein |CT_AV| is the absolute value of the average tensile stress,

[0023] t is the thickness of the chemically strengthened glass-ceramic,

[0024] M K2O is the mass percentage of K2O on the surface of the chemically strengthened glass-ceramic,

[0025] M Na2O is the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic.

[0026] The present application has a better stress level by satisfying a specific relationship between the stress characteristics and the surface component content of the chemically strengthened glass-ceramic, and ensures that it has good single-rod static pressure resistance and high hardness.

[0027] In some embodiments of the present application, the value of the relationship A is: 54802.89, 51024.81, 57170.35, 52689.22, 52272.54, 58526.63, 54807.04, 56429.32, 52815.28, 53580.63, 54032.42, 54060.10, 53361.40 or 54841.31.

[0028] In some embodiments of the present application, the value of the relationship B is: 10333.74 MPa·μm, 11642.77 MPa·μm, 11864.03 MPa·μm, 10818.69 MPa·μm, 10199.45 MPa·μm, 10638.55 MPa·μm, 10862.45 MPa·μm, 9442.20 MPa·μm, 9292.34 MPa·μm, 10157.90 MPa·μm, 10637.99 MPa·μm, 10907.18 MPa·μm, 10429.05 MPa·μm or 11586.62 MPa·μm.

[0029] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfies the following relationship: C = CS_50 / |CT_CV|, C ≥ 0.85, preferably 0.85-1.5, more preferably 0.9-1.3, more preferably 0.9-1.2; wherein CS_50 refers to the compressive stress value at a depth of 50 μm from the main surface of the chemically strengthened glass-ceramics, in MPa, and |CT_CV| refers to the absolute value of the maximum tensile stress, in MPa. By satisfying the specific relationship between the stress characteristics of the chemically strengthened glass-ceramics, the chemically strengthened glass-ceramics has a better stress level, which is conducive to achieving that even after breaking, the fragments are relatively large and do not form a large number of small fragments that can fly everywhere, thereby avoiding safety hazards. When the chemically strengthened glass-ceramics is used as a cover glass of a display screen, it can also meet the emergency use requirements after falling and breaking.

[0030] In some embodiments of the present application, the value of the relationship C is 0.93, 1.12, 1.00, 0.97, 1.03, 0.99, 1.01, 0.98, 0.92, 1.05 or 1.06.

[0031] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfies:

[0032] 140.00 MPa ≤ CS_50, preferably 180.00 MPa ≤ CS_50, more preferably 180.00 MPa ≤ CS_50 ≤ 240.00 MPa, wherein CS_50 refers to the compressive stress value at a depth of 50 μm from the main surface of the chemically strengthened glass-ceramics; and / or,

[0033] 90.00 μm ≤ DOL_0, preferably 100.00 μm ≤ DOL_0, more preferably 100.00 μm ≤ DOL_0 ≤ 160.00 μm, wherein DOL_0 is the depth of the compressive stress layer; and / or,

[0034] 0.18 ≤ DOL_0 / t, preferably 0.20 ≤ DOL_0 / t ≤ 0.25, more preferably 0.22 ≤ DOL_0 / t ≤ 0.23, wherein DOL_0 is the depth of the compressive stress layer and t is the thickness of the chemically strengthened glass-ceramics; and / or,

[0035] 150 MPa ≤ |CT_CV|, preferably 150 MPa ≤ |CT_CV| ≤ 250 MPa, more preferably 180 MPa ≤ |CT_CV| ≤ 250 MPa, wherein |CT_CV| is the absolute value of the maximum tensile stress; and / or,

[0036] 100.00 MPa≤|CT_AV|, preferably, 100.00 MPa≤|CT_AV|≤160.00 MPa, more preferably, 130.00 MPa≤|CT_AV|≤160.00 MPa, wherein |CT_AV| is the absolute value of the average tensile stress; and / or,

[0037] 65000.00 MPa / mm≤CT_LD≤90000.00 MPa / mm, more preferably, 70000.00 MPa / mm≤CT_LD≤90000.00 MPa / mm, wherein CT_LD refers to the tensile stress line density; and / or,

[0038] M K2O ≤3.0%, preferably 0.2%-2%, more preferably 0.3%-1.6%, wherein M K2O is the mass percentage of K2O on the surface of the chemically strengthened glass-ceramic; and / or,

[0039] M Na2O ≥5.0%, preferably 5.0%-20%, more preferably 6%-17%, wherein M Na2O is the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic. By making the chemically strengthened glass-ceramic satisfy the suitable stress characteristics and / or surface composition characteristics, the present application is conducive to obtaining a chemically strengthened glass-ceramic product with a high stress level, and further conducive to exerting the improvement effect of the stress characteristics on the mechanical strength performance, so as to make the chemically strengthened glass-ceramic satisfy excellent damage resistance and high safety performance.

[0040] In some embodiments of the present application, after the two main surfaces of the chemically strengthened glass-ceramic are each thinned by 3 μm in thickness, the obtained chemically strengthened glass-ceramic satisfies: the mass percentage M' K2O of K2O on the surface of the chemically strengthened glass-ceramic and the mass percentage M' Na2O of Na2O on the surface of the chemically strengthened glass-ceramic are:

[0041] M' K2O <3.0%, preferably 0.0%-1%, more preferably 0.1%-0.5%,

[0042] M' Na2O <15.0%, preferably 3.0%-14%, more preferably 4%-12%.

[0043] In some embodiments of the present application, the chemically strengthened glass-ceramic satisfies:

[0044] CS_50 is 210.89 MPa, 216.96 MPa, 216.18 MPa, 217.56 MPa, 216.54 MPa, 214.69 MPa, 217.72 MPa, 218.14 MPa, 216.14 MPa, 212.31 MPa, 213.77 MPa, 215.64 MPa, 201.79 MPa, or 213.58 MPa, wherein CS_50 refers to the compressive stress value at a depth of 50 μm from the main surface of the chemically strengthened glass-ceramic.

[0045] In some embodiments of the present application, DOL_0 is 110.04 μm, 107.70 μm, 109.97 μm, 109.32 μm, 109.13 μm, 109.87 μm, 109.42 μm, 110.63 μm, 109.11 μm, 108.94 μm, 111.27 μm, 106.65 μm, or 119.97 μm, wherein DOL_0 is the depth of the compressive stress layer.

[0046] In some embodiments of the present application, DOL_0 / t is 0.18, 0.19, 0.20, 0.21, 0.24, 0.25, 0.22, or 0.23, wherein DOL_0 is the depth of the compressive stress layer and t is the thickness of the chemically strengthened glass-ceramic.

[0047] In some embodiments of the present application, |CT_CV| is 226.68 MPa, 193.35 MPa, 215.52 MPa, 224.35 MPa, 209.26 MPa, 217.21 MPa, 216.52 MPa, 222.24 MPa, 234.28 MPa, 202.79 MPa, 201.74 MPa, 218.25 MPa, 219.42 MPa, or 207.75 MPa, wherein |CT_CV| is the absolute value of the maximum tensile stress of the chemically strengthened glass-ceramic.

[0048] In some embodiments of the present application, |CT_AV| is 145.28 MPa, 135.44 MPa, 147.26 MPa, 142.53 MPa, 138.79 MPa, 150.24 MPa, 144.35 MPa, 146.02 MPa, 142.02 MPa, 139.69 MPa, 140.56 MPa, 139.63 MPa, 142.25 MPa, or 138.91 MPa, wherein |CT_AV| is the absolute value of the average tensile stress.

[0049] In some embodiments of the present application, CT_LD is 81333.56 MPa / mm, 77092.45 MPa / mm, 82483.27 MPa / mm, 80204.48 MPa / mm, 78205.39 MPa / mm, 84212.52 MPa / mm, 81170.89 MPa / mm, 81403.23 MPa / mm, 79173.31 MPa / mm, 78723.70 MPa / mm, 79309.57 MPa / mm, 77483.48 MPa / mm, 77692.71 MPa / mm, or 72249.87 MPa / mm, wherein CT_LD refers to the tensile stress linear density.

[0050] In some embodiments of the present application, M Na2O is 12.87%, 7.93%, 10.85%, 12.63%, 13.02%, 13.63%, 15.25%, 16.16%, 12.75%, 12.18%, 11.95%, 11.26%, or 12.14%, wherein M Na2O is the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic.

[0051] In some embodiments of the present application, M K2O is 1.33%, 1.21%, 1.47%, 1.48%, 1.42%, 1.57%, 1.32%, 1.43%, 1.36%, 1.41%, 1.54%, 1.5%, or 1.52%, wherein M K2O is the mass percentage of K2O on the surface of the chemically strengthened glass-ceramic.

[0052] In some embodiments of the present application, M’ K2O is 0.300%, 0.289%, 0.318%, 0.321%, 0.315%, 0.301%, 0.326%, 0.305%, 0.322%, 0.319%, or 0.325%, wherein M’ K2O is the mass percentage of K2O on the surface of the chemically strengthened glass-ceramic after the two main surfaces of the chemically strengthened glass-ceramic are each thinned by 3 μm in the thickness direction.

[0053] In some embodiments of the present application, M’ Na2O is 8.40%, 5.03%, 6.78%, 8.31%, 8.86%, 8.81%, 9.02%, 9.55%, 9.71%, 8.36%, 8.07%, 8.01%, 7.83%, or 8.08%, wherein M’ Na2OThe mass percentage of Na2O on the surface of the thinned chemical strengthened glass is 0.5% to 2.5%.

[0054] In some embodiments of the present application, the composition at the center or the tensile stress layer of the chemically strengthened glass, in terms of mole percentage of oxides, comprises:

[0055] SiO2: 58% to 66%, Al2O3: 0% to 3.5%, P2O5: 1% to 2.5%, ZrO2: 3.5% to 5.5%, Li2O: 22% to 32%, SrO: 0% to 2.5%, Na2O: 0% to 3%. In the present application, by adjusting and controlling the content range of each oxide component, it is beneficial to ensure that the chemically strengthened glass meeting the desired crystal phase structure and stress structure is obtained.

[0056] In some embodiments of the present application, the composition at the center or the tensile stress layer of the chemically strengthened glass, in terms of mole percentage of oxides, further comprises:

[0057] K2O: 0% to 1%, CaO: 0% to 1.5%, B2O3: 0% to 1%, Ta2O5: 0% to 1%, BaO: 0% to 2.5%.

[0058] In some embodiments of the present application, the composition at the center or the tensile stress layer of the chemically strengthened glass, in terms of mole percentage of oxides, comprises:

[0059] The mole percentage of SiO2 is 60% to 65%, preferably 60.5% to 64.50%; and / or,

[0060] The mole percentage of Al2O3 is 1% to 3.5%, preferably 1.00% to 2.5%, more preferably 1% to 1.5%; and / or,

[0061] The mole percentage of P2O5 is 1.00% to 2%, preferably 1.20% to 2%; and / or,

[0062] The mole percentage of ZrO2 is 4% to 5%, preferably 4.20% to 5%; and / or,

[0063] The mole percentage of Li2O is 23% to 31%, preferably 24% to 30%, more preferably 27% to 30%; and / or,

[0064] The mole percentage of SrO is 0% to 2%, preferably 0% to 1.9%; and / or,

[0065] The mole percentage of Na2O is 0% to 2.6%, preferably 0% to 1%; and / or,

[0066] K2O in mole percent is 0% to 0.7%, preferably 0% to 0.5%; and / or,

[0067] CaO in mole percent is 0% to 1%, preferably 0% to 0.95%; and / or,

[0068] B2O3 in mole percent is 0% to 0.7%, preferably 0% to 0.5%; and / or,

[0069] Ta2O5 in mole percent is 0% to 0.7%, preferably 0% to 0.5%; and / or,

[0070] BaO in mole percent is 0% to 2%, preferably 0% to 1.9%.

[0071] In some embodiments of the present application, the composition of the chemically strengthened glass-ceramics at the center or the composition of the tensile stress layer, in mole percent of oxides, comprises:

[0072] SiO2 is 60.94%, 61.15%, 61.22%, 61.43%, 61.72%, or 62.22%; and / or,

[0073] Al2O3 is 1.22%, 1.37%, 1.38%, or 1.4%; and / or,

[0074] P2O5 is 1.82%, 1.83%, 1.84%, 1.85%, or 1.86%; and / or,

[0075] ZrO2 is 4.47%, 4.57%, 4.59%, 4.6%, 4.61%, or 4.66%; and / or,

[0076] Li2O is 29.25%, 29.38%, 29.39%, 29.4%, or 29.52%; and / or,

[0077] SrO is 0%, 1.38%, or 1.83%; and / or,

[0078] Na2O is 0% or 0.46%; and / or,

[0079] K2O is 0% or 0.46%; and / or,

[0080] CaO is 0% or 0.92%; and / or,

[0081] B2O3 is 0%, 0.2%, or 0.46%; and / or,

[0082] Ta2O5 is 0% or 0.46%; and / or,

[0083] BaO is 0%, 1.37%, 1.38%, or 1.83%.

[0084] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfy:

[0085] 2.00≤n(SiO2) / n(Li2O)≤2.40, preferably 2.00≤n(SiO2) / n(Li2O)≤2.30, more preferably 2.02≤n(SiO2) / n(Li2O)≤2.20; and / or,

[0086] 90%≤n(SiO2)+n(Li2O)≤95%, preferably 90%≤n(SiO2)+n(Li2O)≤92%; wherein n(SiO2) is the molar percentage content of SiO2 in the center of the chemically strengthened glass-ceramics or in the tensile stress layer, and n(Li2O) is the molar percentage content of Li2O in the center of the chemically strengthened glass-ceramics or in the tensile stress layer. In the present application, by adjusting and controlling the content relationship of SiO2 and Li2O, it is beneficial to ensure that the glass-ceramics satisfying the desired performance and taking lithium disilicate as the main crystal phase structure are obtained, and it is also beneficial to achieve the desired stress distribution structure.

[0087] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfy:

[0088] n(SiO2) / n(Li2O) is 2.08, 2.09, or 2.12; and / or,

[0089] n(SiO2)+n(Li2O) is 90.19%, 90.4%, 90.62%, 90.82%, 91.24%, or 91.62%; wherein n(SiO2) is the molar percentage content of SiO2 in the center of the chemically strengthened glass-ceramics or in the tensile stress layer, and n(Li2O) is the molar percentage content of Li2O in the center of the chemically strengthened glass-ceramics or in the tensile stress layer.

[0090] In some embodiments of the present application, the composition of the center of the chemically strengthened glass-ceramics or the tensile stress layer, in terms of mass percentage of oxides, comprises:

[0091] SiO2: 60%-70%, Al2O3: 0%-6%, P2O5: 2%-8%, ZrO2: 8%-12%, Li2O: 10%-20%, SrO: 0%-6%, Na2O: 0%-3%. In the present application, by adjusting and controlling the content range of each oxide component, it is beneficial to ensure that the chemically strengthened glass-ceramics satisfying the desired crystal phase structure and stress structure are obtained.

[0092] In some embodiments of the present application, the composition at the center of the chemically strengthened glass-ceramic or the tensile stress layer, in mass percent of oxides, further comprises:

[0093] K2O: 0% to 2%, CaO: 0% to 2%, B2O3: 0% to 1%, Ta2O5: 0% to 2%, BaO: 0% to 6%.

[0094] In some embodiments of the present application, the composition at the center of the chemically strengthened glass-ceramic or the tensile stress layer, in mass percent of oxides, comprises:

[0095] SiO2: 62% to 68%, preferably 63% to 67%, and / or,

[0096] Al2O3: 1% to 6%, preferably 2% to 6%, more preferably 2% to 3%, and / or,

[0097] P2O5: 3% to 6%, preferably 3% to 5%, more preferably 4% to 5%, and / or,

[0098] ZrO2: 8% to 11%, preferably 9% to 11%, and / or,

[0099] Li2O: 11% to 18%, preferably 12% to 16%, more preferably 14% to 16%, and / or,

[0100] SrO: 0% to 5%, preferably 0% to 4%, and / or,

[0101] Na2O: 0% to 2.8%, preferably 0% to 1%, and / or,

[0102] K2O: 0% to 1.5%, preferably 0% to 1.2%, and / or,

[0103] CaO: 0% to 1%, preferably 0% to 0.95%, and / or,

[0104] B2O3: 0% to 0.8%, preferably 0% to 0.6%, and / or,

[0105] Ta2O5: 0% to 1.8%, preferably 0% to 1.5%, and / or,

[0106] BaO: 0% to 5.5%, preferably 0% to 5%.

[0107] In some embodiments of the present application, the chemical strengthening microcrystalline glass has a crystallinity of not less than 60%, preferably, the chemical strengthening microcrystalline glass has a crystallinity of 70% to 90%, more preferably, the chemical strengthening microcrystalline glass has a crystallinity of 70% to 80%; and / or,

[0108] In the chemical strengthening microcrystalline glass, the average grain size is not more than 50 nm, preferably, the average grain size is 10 nm to 40 nm, more preferably, the average grain size is 15 nm to 30 nm; and / or,

[0109] In the chemical strengthening microcrystalline glass, the mass percentage of lithium disilicate crystal phase accounts for 80wt% to 100wt% of all crystal phases; and / or,

[0110] In the chemical strengthening microcrystalline glass, the mass percentage of petalite crystal phase is less than or equal to 10%, preferably, less than or equal to 5%, more preferably, the chemical strengthening microcrystalline glass does not contain petalite crystal phase. By making the microcrystalline glass meet the desired crystallinity and / or the desired crystal phase composition and / or the appropriate average grain size, the present application is conducive to making the microcrystalline glass maintain excellent optical performance while meeting excellent mechanical strength performance and high intrinsic strength.

[0111] In some embodiments of the present application, the b value of the chemical strengthening microcrystalline glass is <1.0, preferably, the b value is <0.8, more preferably, the b value is ≤0.6, when the thickness is not more than 0.70 mm; and / or,

[0112] The chemical strengthening microcrystalline glass is transparent in the visible light wavelength range, preferably, the transmittance of the chemical strengthening microcrystalline glass is ≥85% for 550 nm wavelength light, preferably, the transmittance is ≥90%, more preferably, the transmittance is ≥90.2%. The chemical strengthening microcrystalline glass meeting the b value and / or the transmittance can ensure better display effect and transparency effect, and is suitable for use in electronic device display screens which have requirements on display effect.

[0113] In some embodiments of the present application, the Young's modulus of the chemical strengthening microcrystalline glass is not less than 100 GPa, preferably, the Young's modulus is not less than 110 GPa, more preferably, the Young's modulus is 110 GPa to 130 GPa; and / or,

[0114] The density of the chemical strengthening microcrystalline glass is not less than 2.54 g / cm 3 , preferably, the density is 2.54 g / cm 3 to 2.64 g / cm 3 ; and / or,

[0115] The refractive index of the chemical strengthening microcrystalline glass is ≤1.60, preferably, the refractive index is 1.55 to 1.60; and / or,

[0116] the Vickers hardness of the chemically strengthened glass-ceramics is ≥ 700 kgf / mm 2 , preferably, the Vickers hardness is 700 kgf / mm 2 ~ 850 kgf / mm 2 . The Young's modulus, density, Vickers hardness, and refractive index within the above ranges indicate that the chemically strengthened glass-ceramics has high intrinsic strength, which is conducive to achieving excellent mechanical strength performance and excellent damage resistance performance.

[0117] In some embodiments of the present application, the thickness t of the chemically strengthened glass-ceramics is 0.35 mm ~ 1.0 mm, preferably, the thickness t is 0.4 mm ~ 0.7 mm, more preferably, the thickness t is 0.45 mm ~ 0.55 mm; and / or, the chemically strengthened glass-ceramics is 2D, 2.5D, 3D or special-shaped; and / or, the chemically strengthened glass-ceramics is equal-thickness or unequal-thickness. Those skilled in the art can select according to the needs. "Unequal-thickness" means that the glass-ceramics or chemically strengthened glass-ceramics comprises at least two portions with different thicknesses.

[0118] In some embodiments of the present application, the chemically strengthened glass-ceramics is subjected to sandpaper drop test, using 80 mesh sandpaper, and the average sandpaper drop height of the chemically strengthened glass-ceramics is ≥ 1.60 m, preferably, the average sandpaper drop height of the chemically strengthened glass-ceramics is 1.65 m ~ 2.50 m, when the thickness is not more than 0.70 mm, preferably, the thickness is 0.4 mm ~ 0.7 mm, more preferably, the thickness is 0.45 mm ~ 0.55 mm. The greater the measured average sandpaper drop height value, the better the drop damage resistance performance of the chemically strengthened glass-ceramics.

[0119] In some embodiments of the present application, the chemically strengthened glass-ceramics is subjected to single-rod static pressure test using a 10 mm diameter round head metal pressure rod, and the average single-rod static pressure strength of the chemically strengthened glass-ceramics is greater than 200 N, preferably, greater than 230 N. The greater the measured single-rod static pressure strength value, the better the extrusion damage resistance performance of the chemically strengthened glass-ceramics.

[0120] In a second aspect, a glass device is provided, which comprises the chemically strengthened glass-ceramics according to any one of the embodiments of the first aspect.

[0121] In a third aspect, a cover glass is provided, which comprises the chemically strengthened glass-ceramics according to any one of the embodiments of the first aspect. The cover glass can be a display screen cover, back cover or camera protection cover of an electronic device.

[0122] In a fourth aspect, there is provided an electronic device comprising the chemically strengthened glass-ceramic according to any one of the first aspect.

[0123] In some embodiments of the present application, the electronic device comprises a housing assembled on the outer side of the electronic device, and the housing comprises the chemically strengthened glass-ceramic according to any one of the first aspect.

[0124] In some embodiments of the present application, the housing comprises a display cover plate assembled on the front side of the electronic device, and the display cover plate comprises the chemically strengthened glass-ceramic according to any one of the first aspect.

[0125] In some embodiments of the present application, the housing comprises a back cover assembled on the back side of the electronic device, and the back cover comprises the chemically strengthened glass-ceramic according to any one of the first aspect.

[0126] In some embodiments of the present application, the electronic device further comprises a camera assembly located inside the housing, and the housing comprises a camera protection cover plate covering the camera assembly, and the camera protection cover plate comprises the chemically strengthened glass-ceramic according to any one of the first aspect.

[0127] In some embodiments of the present application, the electronic device further comprises a middle frame located between the display module and the housing, and the middle frame comprises the chemically strengthened glass-ceramic according to any one of the first aspect.

[0128] In some embodiments, the housing can be partially made of the chemically strengthened glass-ceramic, or can be entirely made of the chemically strengthened glass-ceramic. The electronic device in the present application can be one or more of the display cover plate, the back cover, the camera protection cover plate, and the middle frame, which are made of the chemically strengthened glass-ceramic according to any one of the first aspect.

[0129] The one or more of the above technical solutions provided by the present application has the following advantages compared with the prior art:

[0130] The chemical strengthening microcrystalline glass in the application meets specific crystal phase structure and stress distribution structure, so that the chemical strengthening microcrystalline glass has excellent damage resistance and high safety performance. The chemical strengthening microcrystalline glass can achieve excellent drop damage resistance, and when it is broken by impact, relatively large fragments are generated, which will not form a large number of small fragments that can fly everywhere, so that safety hazards can be avoided, and the emergency use demand can be met after breaking. For example, in the application, by making the tensile stress linear density value of the chemical strengthening microcrystalline glass with the main crystal phase of lithium disilicate crystal phase and the ratio of the stress integral of the tensile stress layer close to the middle position to the thickness t meet a specific difference relationship, the chemical strengthening microcrystalline glass meets a specific stress distribution structure. In the case of ensuring that the chemical strengthening microcrystalline glass has a relatively high overall stress level, the internal stress distribution of the chemical strengthening microcrystalline glass can be ensured to be safer, so as to facilitate the chemical strengthening microcrystalline glass to maintain a safe stress state. BRIEF DESCRIPTION OF DRAWINGS

[0131] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0132] FIG. 1 is a DSC curve diagram of the base glass of Example 13 of the application;

[0133] FIG. 2 is an XRD diagram of the microcrystalline glass of Example 13 of the application;

[0134] FIG. 3 is an XRD comparison diagram of the microcrystalline glass and the chemical strengthening microcrystalline glass of Example 13 of the application;

[0135] FIG. 4 is a transmittance curve diagram of the microcrystalline glass of Example 13 of the application;

[0136] FIG. 5 is a transmittance curve comparison diagram of the microcrystalline glass and the chemical strengthening microcrystalline glass of Example 13 of the application;

[0137] FIG. 6 is a stress change curve with thickness of the chemical strengthening microcrystalline glass of Example 13 of the application;

[0138] FIG. 7 is a stress change curve with thickness of the chemical strengthening microcrystalline glass of Example 3, Example 4, Comparative Example 4 and Comparative Example 5 of the application;

[0139] FIG. 8 is a vertical projection diagram of the fragment particles in a two-dimensional plane after the chemical strengthening microcrystalline glass of Example 13 of the application is broken in the drop test;

[0140] Fig. 9 is a vertical projection of the fragments of the chemically strengthened glass-ceramics of Example 14 of the present application on a two-dimensional plane after the glass-ceramics was broken in the drop test;

[0141] Fig. 10 is a vertical projection of the fragments of the chemically strengthened glass-ceramics of Comparative Example 6 of the present application on a two-dimensional plane after the glass-ceramics was broken in the drop test;

[0142] Fig. 11 is a vertical projection of the fragments of the chemically strengthened glass-ceramics of Comparative Example 12 of the present application on a two-dimensional plane after the glass-ceramics was broken in the drop test;

[0143] Fig. 12 is a schematic diagram of the front side structure of an electronic device according to an embodiment of the present application;

[0144] Fig. 13 is a schematic diagram of the rear side structure of an electronic device according to an embodiment of the present application;

[0145] Fig. 14 is a schematic diagram of the structure of an electronic device according to an embodiment of the present application;

[0146] Fig. 15 is a schematic diagram of the structure of an electronic device according to an embodiment of the present application;

[0147] Fig. 16 is a schematic diagram of the structure of a chemically strengthened glass-ceramics according to an embodiment of the present application, wherein t is the thickness of the glass, d is the depth of the compressive stress layer, 21 is the compressive stress layer, and 22 is the tensile stress layer.

[0148] Reference signs: 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

[0149] 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 regarded 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.

[0150] The endpoints of the ranges and any values disclosed in the present application are not limited to the precise values stated. The ranges or values should be construed to be approximations that allow for significant figures to account for variations in the measurement process. For numerical ranges, the end points are included in the ranges, and the ranges are inclusive of the individual points.

[0151] It should be noted that the performance requirements of the microcrystalline glass or the chemically strengthened microcrystalline glass provided in the present application, such as optical performance requirements, stress performance, strength performance requirements, etc., are not limited to a specific thickness, and the thickness of 0.47mm to 0.54mm used in the specific embodiments is only for simplification of the description and is not a limitation on the scope of protection. The term "about" herein means that a reasonable deviation is allowed.

[0152] Terminology and test methods:

[0153] In the present application, the microcrystalline glass 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 the base glass. The microcrystalline glass is also known as glass ceramic or crystallized glass.

[0154] In the present application, the chemically strengthened microcrystalline glass refers to a solid composite material obtained by chemical strengthening treatment of the microcrystalline glass. It should be understood that when the chemical strengthening treatment is performed, the alkali metal ions with large ionic radius (such as potassium ions or sodium ions) in the molten salt bath (or also known as molten salt bath) will replace the alkali metal ions with small ionic radius (such as sodium ions or lithium ions) in the microcrystalline glass, thereby generating an exchange ion volume difference and generating a compressive stress (or also known as compression stress) on the surface of the microcrystalline glass.

[0155] In the present application, the base glass (or also known as base glass) refers to a glass that has not been subjected to nucleation treatment, crystallization treatment and strengthening treatment.

[0156] In the present application, the nucleation treatment refers to the growth of crystal nuclei in the base glass through heat treatment; the crystallization treatment refers to the precipitation of target crystals or crystal phases in the base glass through heat treatment.

[0157] In the present application, the composition at the center of the chemically strengthened microcrystalline glass refers to the composition at or near the center of the depth or thickness of the chemically strengthened microcrystalline glass, i.e., the composition of the region in the chemically strengthened microcrystalline glass that has not been subjected to ion exchange. It should be understood that the composition at the center of the chemically strengthened microcrystalline glass is the same as or substantially the same as the composition of the microcrystalline glass used to prepare the chemically strengthened microcrystalline glass but has not been subjected to chemical strengthening treatment.

[0158] In the present application, the visible light wavelength range refers to 360nm to 740nm.

[0159] In the present application, the main crystal phase (or also known as primary crystal phase) refers to a crystal phase with a higher mass content (or also known as weight percentage, mass percentage) than other crystal phases present in the microcrystalline glass or the chemically strengthened microcrystalline glass.

[0160] In the present application, the main surface refers to the surface with the largest surface area, such as the upper surface or lower surface of the horizontally placed microcrystalline glass sheet.

[0161] In this application, crystallinity refers to the percentage of the total mass of crystalline phases in glass-ceramics or chemically strengthened glass-ceramics to the total mass of glass-ceramics or chemically strengthened glass-ceramics, or the total content of crystalline phases in glass-ceramics or chemically strengthened glass-ceramics.

[0162] In this application, when light of a certain wavelength is irradiated onto the main surface of a glass-ceramic or a chemically strengthened glass-ceramic, the light will be reflected, absorbed, and transmitted. The ratio of the intensity of the transmitted portion to the intensity of the incident light is the transmittance.

[0163] In this application, refractive index refers to the ratio of the speed of light in a vacuum to the speed of light in the medium.

[0164] In this application, crystallized glass raw material refers to glass raw material that has undergone heat treatment for a period of time, so that the glass has reached a certain degree of crystallinity, but has not yet reached the target degree of crystallinity, and can continue to crystallize to reach the target degree of crystallinity when heated.

[0165] In this application, CT_LD refers to the tensile stress linear density, with units of MPa / mm. CT_LD is calculated using the following formula:

[0166] Where t represents the thickness of the chemically strengthened glass-ceramic, in mm; DOL_0 represents the compressive stress layer depth of the chemically strengthened glass-ceramic, in μm; and |CT_AV| represents the absolute value of the average tensile stress of the chemically strengthened glass-ceramic, in MPa. It should be understood that the calculation formula for the tensile stress linear density involves substituting the data according to the above unit requirements to obtain the calculation result; the units are not involved in the calculation. In this application, the tensile stress linear density value is approximately the ratio of the definite integral of the tensile stress curve to the thickness of the chemically strengthened glass-ceramic.

[0167] It should be understood that after glass-ceramics are placed in a molten salt bath for ion exchange, a compressive stress layer (or compressive stress region) is formed on the surface of the glass-ceramics, while a tensile stress layer (or tensile stress region) is formed inside the glass-ceramics. For example, during chemical strengthening, large-radius alkali metal ions in the molten salt bath exchange ions with small-radius alkali metal ions in the glass-ceramics, thereby forming a compressive stress layer on the surface of the glass-ceramics and a tensile stress layer inside the glass-ceramics. That is, after chemical strengthening, a chemically strengthened glass-ceramics containing both a compressive stress layer and a tensile stress layer is obtained.

[0168] In this application, CS_50 refers to the compressive stress value at a depth of 50 μm from the main surface of the chemically strengthened glass-ceramic, in MPa, obtained by testing with an SLP-2000 stress meter (or also known as a scattered light photoelastic stress meter).

[0169] In the present application, |CT_CV| refers to the absolute value of the maximum tensile stress, with units of MPa, obtained by SLP-2000 stress meter testing.

[0170] In the present application, |CT_AV| refers to the absolute value of the average tensile stress, with units of MPa, specifically the absolute value of the average of all tensile stresses in the tensile stress layer, obtained by SLP-2000 stress meter testing.

[0171] 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, obtained by SLP-2000 stress meter testing.

[0172] In the present application, the test method of the aforementioned stress performance is as follows: SLP-2000 stress meter is used for testing, the light source wavelength is 518 nm, SOC = 25.5 (nm / cm) / MPa, the refractive index is set according to the refractive index value of the sample to be tested, and the exposure time is 300 usec. When testing the stress performance of the chemically strengthened glass-ceramic, a conductive liquid is first dripped on the stress meter, then the chemically strengthened glass-ceramic sample to be tested is wiped clean and placed on the test path to test its stress value. Among them, 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 tensile stress linear density calculation formula; the stress data of the chemically strengthened glass-ceramic measured by SLP-2000 is used to calculate the stress integral value of the tensile stress layer from the position 2 times DOL_0 to the position of half the thickness of the chemically strengthened glass-ceramic along the thickness direction of the chemically strengthened glass-ceramic.

[0173] In the present application, the value of b is used to characterize the yellow-blue value of the material. The b value in the present application is the transmission light b value, and a positive b value indicates that the material is blue.

[0174] In the present application, M K2O is the mass percentage of K2O on the surface of the chemically strengthened glass-ceramic, M K2O is the mass percentage of K2O on the surface of the chemically strengthened glass-ceramic after the two main surfaces are each thinned by 3 μm along the thickness direction, M Na2O is the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic, M Na2O is the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic after the two main surfaces are each thinned by 3 μm along the thickness direction.

[0175] M K2OThe test method is as follows: the content of K element on the surface of the chemically strengthened glass ceramic is measured by an X-ray fluorescence spectrometer (XRF), and then the mass percentage of K2O on the surface is calculated. The calculation method is: the mass percentage of K2O on the surface = (the content of K element on the surface × the relative molecular mass of K2O) / (the relative atomic mass of K element × 2). It should be understood that the content of K element on the surface = the mass of K element / the total mass of elements, and the total mass of elements = the total mass of oxides. The equipment model of the X-ray fluorescence spectrometer (XRF) used is Thermo Scientific ARL PERFORM’X, the target material is Rh (rhodium), the light tube voltage is 40 kV, the current is 60 mA, the collimator is 0.15, the crystal is selected as LiF200, the detector is selected as FPC, the test range is a circle with a diameter of 29 mm, and the test method adopts the X_UQ method in the OXSAS analysis software.

[0176] M Na2O The test method is as follows: the content of K element on the surface of the chemically strengthened glass ceramic is measured by an X-ray fluorescence spectrometer (XRF), and then the mass percentage of K2O on the surface is calculated. The calculation method is: the mass percentage of K2O on the surface = (the content of K element on the surface × the relative molecular mass of K2O) / (the relative atomic mass of K element × 2). It should be understood that the content of K element on the surface = the mass of K element / the total mass of elements, and the total mass of elements = the total mass of oxides. The equipment model of the X-ray fluorescence spectrometer (XRF) used is Thermo Scientific ARL PERFORM’X, the target material is Rh (rhodium), the light tube voltage is 40 kV, the current is 60 mA, the collimator is 0.15, the crystal is selected as LiF200, the detector is selected as FPC, the test range is a circle with a diameter of 29 mm, and the test method adopts the X_UQ method in the OXSAS analysis software.

[0177] In this application, the non-standard test is used when the XRF instrument is tested, and the concentration of elements with atomic number 6 and below or oxides thereof in the chemically strengthened glass ceramic is not tested. The mass percentage of K2O on the surface of the chemically strengthened glass ceramic = the mass of K2O / the total mass of oxides, and the mass percentage of Na2O on the surface of the chemically strengthened glass ceramic = the mass of Na2O / the total mass of oxides, wherein the oxides include SiO2, Al2O3, ZrO2, Na2O, K2O, P2O5 and other oxides that can be accurately tested by XRF, and do not include the content of B2O3, Li2O and other oxides that cannot be accurately tested by XRF. K2O and M’ Na2O The test method of M K2O and M Na2O .

[0178] In the present application, the thickness is obtained by micrometer test. It should be understood that the total Na-K and / or Li-Na exchange amount increment (mass) of the glass-ceramic sample is generally not more than 1.5% of the total mass of the sample when the ion exchange treatment or chemical strengthening treatment is performed, so the expansion effect in the thickness direction is extremely slight, and the thickness can be approximately considered to be substantially unchanged. That is, the thickness of the glass-ceramic changes very little before and after chemical strengthening, and can be substantially ignored, and the thickness of the glass-ceramic is substantially the same as the thickness of the chemical strengthened glass-ceramic prepared therefrom.

[0179] 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).

[0180] In the present application, the Young's modulus is used to characterize 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.

[0181] In the present application, the crystalline phase, crystallinity and average grain size of the glass-ceramic or the chemically strengthened glass-ceramic are confirmed by XRD test. Specifically:

[0182] (1) XRD test: The glass-ceramic or the chemically strengthened glass-ceramic of the present application is crushed and ground into a sample with a particle size of less than 75 μm, and the ground sample is tested by an X-ray diffractometer to obtain an 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.

[0183] (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.

[0184] (3) Determination of crystallinity (or also referred to as total content of crystalline phase): The test results of XRD (RAW format) are imported into Jade software for fitting and calculation, so as to determine the crystallinity of the sample. Specifically, the ratio of the peak area of the fitted crystalline phase to the total peak area of the fitting is referred to as the crystallinity of the sample.

[0185] (4) Determination of average grain size (or also referred to as average crystal size): The average grain size of the sample can be calculated according to the Scherrer formula D = Kλ / (βcosθ) using 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 Jade outputs a fitting report. 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 / 180x3.14), and the grain size of each diffraction peak is calculated by the Scherrer formula D = Kλ / (βcosθ) and then averaged to obtain the average grain size in the sample.

[0186] In the present application, the transmittance and b value of the microcrystalline glass are tested by using a haze meter according to the national standard GB / T 7962.12-2010 Optical Glass-Determination of Spectral Transmittance. Specifically, the transmittance and b value of light of different wavelengths of 5 pieces of microcrystalline glass in the same batch are tested by using a haze meter. The average of the b values measured from the 5 pieces of microcrystalline glass is taken as the b value result of the microcrystalline glass. The average of the transmittance at 550 nm wavelength light measured from the 5 pieces of microcrystalline glass is taken as the transmittance result of the microcrystalline glass at 550 nm wavelength light. The haze meter used in the present application is a Konica Minolta Spectrophotometer CM-3600A from Japan, 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 about 24°C and an air humidity of about 40%.

[0187] In the present application, the transmittance curve of the microcrystalline glass or chemically strengthened microcrystalline glass in the visible light wavelength range is also tested by using a UV-2600 ultraviolet visible spectrophotometer from Shimadzu.

[0188] Density test: In the present application, the density of the microcrystalline glass is tested by using an electronic density balance SD-200L from Japan ALFA MIRAGE.

[0189] Refractive index test: In the present application, the refractive index of the microcrystalline glass is tested by using an Abbe refractometer WYA-2WAJ from Li Chenbangxi Instrument Technology in Shanghai, China.

[0190] Thermal expansion softening point test: the sample is made 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, and the thermal expansion test curve is output. The temperature corresponding to the peak position of the curve is the thermal expansion softening point temperature of the sample.

[0191] Test of Vickers hardness: the chemically strengthened glass-ceramics is made into a small piece with a length of 50 mm, a width of 50 mm and a thickness of (0.47-0.54) mm, and a glass sample with a clean surface and no visible scratches, pits and cracks is selected as a test sample, and then a Vickers hardness tester is used to measure the Vickers hardness. The Vickers hardness tester used in the test of the present application is a digital small load Vickers hardness tester with a model number of VTD405 from Beijing Kewei Technology Co., Ltd. The test conditions are as follows: load 300 gf, loading time 10 s, and the validity of the indentation meets the standard of GB / T 37900-2019 "Test methods for hardness and fracture toughness of ultra-thin glass - Small load Vickers indentation method". Three different positions on the surface of the same test sample are selected for measurement, and the average of the three measurement results is taken as the Vickers hardness result of the test sample.

[0192] Single-rod static pressure test: the glass sample to be tested is placed on the bottom ring of a tensile testing machine (LT-850A), the test software is started, and the moving speed of the extrusion rod (rod diameter 10 mm, ball head diameter 10 mm) is set to 10 mm / min. Click to start the test, and the extrusion rod will apply force to the center of the glass sample to be tested at the set moving speed until the glass sample cracks and breaks. The test software will automatically read the force (N) when the glass sample breaks, which is recorded as the single-rod static pressure strength that the glass sample can withstand, as the test result. Ten glass samples in the same state are tested, and the average of the test results is taken as the single-rod static pressure strength of the glass sample to be tested.

[0193] Average sandpaper drop height test: in the present application, the anti-sandpaper drop height of each sample of the chemically strengthened glass-ceramics sample of the same embodiment or the same comparative example is added together, and the value obtained by dividing the number of samples is recorded as the average anti-sandpaper drop height of the chemically strengthened glass-ceramics tested, which is used to characterize the anti-drop damage performance of the chemically strengthened glass-ceramics. The anti-drop damage capability here is obtained by using uniform sandpaper test, which can simulate the application scenario of the chemically strengthened glass-ceramics falling onto a ground with relatively uniform roughness.

[0194] Specifically, at least 10 samples are taken from each batch for testing, and the average anti-sandpaper drop height

[0195] wherein n is the number of glass samples tested per batch, and hi is the anti-sandpaper drop height of a single sample.

[0196] The test method for the sandpaper drop height of a single sample is as follows:

[0197] Step 1: Paste 80-mesh sandpaper on the lower surface of a model machine, and place the model machine on a green chart LT-SKDL-CD type drop machine.

[0198] 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, specifically with the main surface of the chemically strengthened microcrystalline glass facing the sandpaper. The model machine is dropped at a certain drop height to impact the chemically strengthened microcrystalline glass sample directly below the model machine. If the chemically strengthened microcrystalline glass sample does not break, the drop height of the model machine is increased at a certain rate, and the model machine is continued to be dropped to impact 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 dropped once. If the sample does not break, the drop height of the model machine is increased by 0.1 m, and the sample is dropped again. The above process is repeated until the chemically strengthened microcrystalline glass sample breaks.

[0199] Step 3: The last drop height before the chemically strengthened microcrystalline glass sample breaks is recorded as the sandpaper drop height resistance of the sample. 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 resistance of the sample is 0.4 m.

[0200] The average size of the longest side of the fragments is tested as follows: First, the average sandpaper drop height resistance is tested on 80-mesh sandpaper. After the glass breaks, a broken result photo is taken and imported into a particle size analysis and calculation software (such as Nano measure) for analysis. In the analysis, more than 80% of the glass fragments are selected and marked, and the longest side of the selected glass fragments in the two-dimensional vertical projection is relatively large. The analysis and calculation software automatically calculates and outputs the average value of the maximum size of the selected glass fragments.

[0201] Without being limited by any theory, for the lithium disilicate glass-ceramics with high lithium content, the improvement of the overall stress level does not necessarily ensure that it obtains excellent damage resistance. If only the improvement of the overall stress level is focused on during strengthening, and the stress distribution is not focused on, the stress distribution in the prepared chemically strengthened glass-ceramics is often inappropriate, thereby the phenomenon of "reduced strengthening stability" occurs. When the overall stress level is improved, the internal tensile stress is too large, especially the tensile stress in a certain region is too large. Such stress distribution structure not only cannot ensure that the chemically strengthened glass-ceramics achieves excellent damage resistance, but also brings safety hazards, leading to the chemically strengthened glass-ceramics to easily explode and crack under slight impact, small fragments are easy to fly everywhere, and even self-explosion phenomenon is easy to occur, which seriously affects the reliability of the chemically strengthened glass-ceramics product and is easy to seriously affect the personal safety of the user.

[0202] Therefore, for the glass-ceramics with lithium disilicate as the main crystal phase, the chemically strengthened glass-ceramics prepared by the present application meets specific stress characteristics, so that the chemically strengthened glass-ceramics has a specific stress distribution structure. While ensuring the improvement of the mechanical strength performance of the chemically strengthened glass-ceramics and the improvement of its damage resistance, the chemically strengthened glass-ceramics also maintains a safe stress state and has high safety performance.

[0203] The chemically strengthened glass-ceramics provided by the present application has excellent drop damage resistance, and when the chemically strengthened glass-ceramics is broken by drop impact, relatively large fragments are generated, and a large number of small fragments that are easy to fly everywhere are not formed, so that safety hazards can be avoided. When the chemically strengthened glass-ceramics is used as the cover glass of a display screen, the emergency use demand can be met after drop breakage.

[0204] As described above, in some embodiments of the present application, a chemically strengthened glass-ceramics is provided, and the chemically strengthened glass-ceramics contains lithium disilicate crystal phase, wherein the lithium disilicate crystal phase has a higher mass percentage than other crystal phases present in the chemically strengthened glass-ceramics;

[0205] The surface of the chemically strengthened glass-ceramics has a compressive stress layer, and has a tensile stress layer inside;

[0206] The chemically strengthened glass-ceramics meets the following relationship:

[0207] A≥49500, preferably A≥50000, more preferably A≥51000, and more preferably the value of A is 49500-65000;

[0208] CT_LD is the tensile stress linear density, the unit is MPa / mm, and CT_LD≥60000 MPa / mm,

[0209] t is the thickness of the chemically strengthened glass-ceramic, in mm,

[0210] CT_LD is the ratio of the stress integral of the compressive stress layer from the position of 2 times DOL_0 of the main surface of the chemically strengthened glass-ceramic to the position of half of the thickness of the chemically strengthened glass-ceramic to the thickness t, in MPa / mm, wherein x is the depth from the main surface of the chemically strengthened glass-ceramic,

[0211] In the relationship A, 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, and the value of A represents the difference between the value of the compressive stress linear density (in this application, the value of the compressive stress linear density is basically the ratio of the definite integral of the compressive stress curve to the thickness of the chemically strengthened glass-ceramic) and the ratio of the stress integral of the compressive stress layer from the position of 2 times DOL_0 of the main surface of the chemically strengthened glass-ceramic to the position of half of the thickness of the chemically strengthened glass-ceramic to the thickness t.

[0212] In this application, by making the value of the compressive stress linear density of the chemically strengthened glass-ceramic with the main crystal phase of lithium disilicate crystal phase and the ratio of the stress integral of the compressive stress layer close to the middle position to the thickness t satisfy a specific difference relationship, the chemically strengthened glass-ceramic satisfies a specific stress distribution structure, which can ensure the internal stress distribution of the chemically strengthened glass-ceramic to be safer while ensuring that the chemically strengthened glass-ceramic has a relatively high overall stress level, thereby helping the chemically strengthened glass-ceramic to maintain a safe stress state. The chemically strengthened glass-ceramic of the present application not only has excellent damage resistance, such as excellent drop damage resistance, but also has high safety performance. When it is broken by impact, relatively large fragments are generated, and a large number of small fragments that can easily fly around are not formed, which can avoid safety hazards and meet the emergency use demand after breaking.

[0213] In some embodiments of the present application, the chemically strengthened glass-ceramic satisfies: 60000.00 MPa / mm≤CT_LD, preferably 65000.00 MPa / mm≤CT_LD≤90000.00 MPa / mm, more preferably 70000.00 MPa / mm≤CT_LD≤90000.00 MPa / mm, wherein CT_LD refers to the compressive stress linear density. Controlling the CT_LD of the chemically strengthened glass-ceramic to be in a relatively large value, for example, not less than 60000 MPa / mm, is beneficial to ensure that the compressive stress stored in the chemically strengthened glass-ceramic is dense enough, thereby helping to ensure that it has a relatively high surface stress level and can obtain excellent damage resistance, such as excellent drop damage resistance, to meet market demand.

[0214] In some embodiments, the CT LD of the chemically strengthened glass-ceramics can be 60000 MPa / mm to 72000 MPa / mm, 62000 MPa / mm to 70000 MPa / mm, 64000 MPa / mm to 85000 MPa / mm, or 75000 MPa / mm to 80000 MPa / mm. In some embodiments, the CT LD of the chemically strengthened glass-ceramics can be 60000 MPa / mm, 65000 MPa / mm, 66000 MPa / mm, 67000 MPa / mm, 68000 MPa / mm, 69000 MPa / mm, 70000 MPa / mm, 72000 MPa / mm, 74000 MPa / mm, 76000 MPa / mm, 78000 MPa / mm, 80000 MPa / mm, 85000 MPa / mm, 90000 MPa / mm, 81333.56 MPa / mm, 77092.45 MPa / mm, 82483.27 MPa / mm, 80204.48 MPa / mm, 78205.39 MPa / mm, 84212.52 MPa / mm, 81170.89 MPa / mm, 81403.23 MPa / mm, 79173.31 MPa / mm, 78723.70 MPa / mm, 79309.57 MPa / mm, 77483.48 MPa / mm, 77692.71 MPa / mm, or 72249.87 MPa / mm, or a value within a range defined by any two of the specifically named values, 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 above 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.

[0215] In some embodiments, the value of relationship A can be: 49500, 50000, 50500, 51000, 51500, 52000, 52500, 53000, 53500, 54000, 54500, 55000, 55500, 56000, 56500, 57000, 57500, 58000, 58500, 59000, 59500, 60000, 65000, 54802.89, 51024.81, 57170.35, 52689.22, 52272.54, 58526.63, 54807.04, 56429.32, 52815.28, 53580.63, 54032.42, 54060.10, 53361.40 or 54841.31, or a value within a range defined by any two of the above specific values as endpoints, as long as a chemically strengthened glass-ceramic 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-ceramic with desired properties of the present application is obtained.

[0216] In some embodiments of the present application, the chemically strengthened glass-ceramic satisfies the following relationship:

[0217] B = [ | CT AV | x (t / 2 - DOL 0) ] x [5 x M K2O + 0.5 x M K2O + 0.5 x M Na2O ], B ≥ 9000 MPa·μm, preferably, B ≥ 9100 MPa·μm, more preferably, B ≥ 9200 MPa·μm, and more preferably, the value of B is in the range of 9000 MPa·μm to 13000 MPa·μm.

[0218] wherein | CT AV | is the absolute value of the average tensile stress,

[0219] t is the thickness of the chemically strengthened glass-ceramic,

[0220] M K2O is the mass percentage of K2O on the surface of the chemically strengthened glass-ceramic,

[0221] M Na2O is the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramic.

[0222] The present application provides a chemically strengthened glass-ceramic with a better stress level by satisfying a specific relationship between the stress characteristics and the surface component content of the chemically strengthened glass-ceramic, ensuring that it has good single-rod static pressure resistance and high hardness.

[0223] In some embodiments, the value of relationship B can be: 9000.00 MPa·μm, 9500.00 MPa·μm, 10000.00 MPa·μm, 10500.00 MPa·μm, 11000.00 MPa·μm, 11500.00 MPa·μm, 12000.00 MPa·μm, 13000.00 MPa·μm, 10333.74 MPa·μm, 11642.77 MPa·μm, 11864.03 MPa·μm, 10818.69 MPa·μm, 10199.45 MPa·μm, 10638.55 MPa·μm, 10862.45 MPa·μm, 9442.20 MPa·μm, 9292.34 MPa·μm, 10157.90 MPa·μm, 10637.99 MPa·μm, 10907.18 MPa·μm, 10429.05 MPa·μm, or 11586.62 MPa·μm, or a value within a range defined by any two of the above specific values as endpoints, as long as a chemically strengthened glass-ceramic 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-ceramic with desired properties of the present application is obtained.

[0224] In some embodiments of the present application, the chemically strengthened glass-ceramic satisfies the following relationship: C = CS_50 / |CT_CV|, C ≥ 0.85, preferably 0.85-1.5, more preferably 0.9-1.3, more preferably 0.9-1.2; wherein CS_50 is the compressive stress value at a depth of 50 μm from the main surface of the chemically strengthened glass-ceramic, in units of MPa, and |CT_CV| is the absolute value of the maximum tensile stress, in units of MPa. By satisfying a specific relationship between the stress characteristics of the chemically strengthened glass-ceramic, the present application is conducive to making the chemically strengthened glass-ceramic have a better stress level, and thus is conducive to achieving that even after breaking, the fragments are relatively large and do not form a large number of small fragments that can easily fly around, and is conducive to avoiding safety hazards. When the chemically strengthened glass-ceramic is used as a cover glass of a display screen, it can also meet the emergency use requirements after falling and breaking.

[0225] In some embodiments, the value of the relationship C can be: 0.85, 0.90, 0.95, 1.00, 1.05, 1.10, 1.15, 1.20, 1.25, 1.30, 0.93, 1.12, 1.00, 0.97, 1.03, 0.99, 1.01, 0.98, 0.92, or 1.06, or a value within a range of values having any two of the above specifically enumerated values as endpoints, as long as a chemically strengthened glass with 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 with the desired properties of the present application is obtained.

[0226] In the present application, by having the chemically strengthened glass satisfy suitable stress characteristics and / or surface composition characteristics, it is beneficial to obtain a chemically strengthened glass article having a high stress level, and in turn, to exert the stress characteristics' improving effect on the mechanical strength properties, so that the chemically strengthened glass satisfies excellent damage resistance properties and high safety properties.

[0227] In some embodiments of the present application, the chemically strengthened glass satisfies: 140.00 MPa ≤ CS_50, preferably, 180.00 MPa ≤ CS_50, more preferably, 180 MPa ≤ CS_50 ≤ 240.00 MPa, wherein CS_50 refers to the compressive stress value at a depth of 50 μm from the main surface of the chemically strengthened glass.

[0228] In some embodiments, the CS_50 of the chemically strengthened glass can be 140.00 MPa, 150.00 MPa, 160.00 MPa, 170.00 MPa, 180.00 MPa, 190.00 MPa, 200.00 MPa, 210.00 MPa, 220.00 MPa, 230.00 MPa, 240.00 MPa, 210.89 MPa, 216.96 MPa, 216.18 MPa, 217.56 MPa, 216.54 MPa, 214.69 MPa, 217.72 MPa, 218.14 MPa, 216.14 MPa, 212.31 MPa, 213.77 MPa, 215.64 MPa, 201.79 MPa, or 213.58 MPa, or a value within a range of values having any two of the above specifically enumerated values as endpoints, as long as a chemically strengthened glass with 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 with the desired properties of the present application is obtained.

[0229] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfies: 90.00 pm≤DOL_0, preferably, 100.00 pm≤DOL_0, more preferably, 100.00 pm≤DOL_0≤160.00 pm, wherein DOL_0 is the depth of compressive stress layer. By having the chemically strengthened glass-ceramics with a suitable DOL_0, it is more beneficial to increase the energy of the chemically strengthened glass-ceramics to offset the energy driving the crack propagation, thereby ensuring that the chemically strengthened glass-ceramics has excellent damage resistance, such as excellent drop damage resistance, when a blunt or sharp object impacts or penetrates the chemically strengthened glass-ceramics, and the sudden crack directly penetrates the compressive stress region to the tensile stress region.

[0230] In some embodiments, the DOL_0 of the chemically strengthened glass-ceramics can be 90.00 pm, 100.00 pm, 105.00 pm, 110.00 pm, 115.00 pm, 120 pm, 130 pm, 140 pm, 150 pm, 160 pm, 110.04 pm, 107.70 pm, 109.97 pm, 109.32 pm, 109.13 pm, 109.87 pm, 109.42 pm, 110.63 pm, 109.11 pm, 108.94 pm, 111.27 pm, 106.65 pm, or 119.97 pm, or can be 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 the desired properties of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramics with the desired properties of the present application can be obtained.

[0231] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfies: 0.18≤DOL_0 / t, preferably, 0.20≤DOL_0 / t≤0.25, more preferably, 0.22≤DOL_0 / t≤0.23, wherein DOL_0 is the depth of compressive stress layer, and t is the thickness of the chemically strengthened glass-ceramics. By having the depth of compressive stress layer and the thickness of the chemically strengthened glass-ceramics satisfy a suitable proportional relationship, it is beneficial to ensure that the chemically strengthened glass-ceramics is in a more optimal stress distribution state, thereby facilitating the stress structure to play a role in improving the mechanical strength performance.

[0232] In some embodiments, the value of DOL_0 / t in the chemically strengthened glass-ceramics can be 0.20-0.23 or 0.21-0.22. In some embodiments, the value of DOL_0 / t in the chemically strengthened glass-ceramics can be 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.24 or 0.25, 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-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 a chemically strengthened glass-ceramics with desired properties of the present application can be obtained.

[0233] The thickness t of the chemically strengthened glass-ceramics described in the present application is not particularly limited. For example, in some embodiments of the present application, the glass-ceramics used to prepare the chemically strengthened glass-ceramics or the chemically strengthened glass-ceramics is in the form of a plate, and the thickness t of the glass-ceramics or the chemically strengthened glass-ceramics can be 0.35-1.0 mm; preferably, the thickness t is 0.4-0.7 mm; more preferably, the thickness t is 0.45-0.55 mm. In some embodiments of the present application, the thickness of the chemically strengthened glass-ceramics can be 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1.0 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-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 a chemically strengthened glass-ceramics with desired properties of the present application can be obtained. At present, electronic devices tend to be light and thin, and it is believed that the smaller the thickness, the lighter the weight, and the more excellent the optical effect. The present application can make the chemically strengthened glass-ceramics as thin as possible while ensuring strength, so as to meet the requirements of light and thin electronic devices.

[0234] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfies 150 MPa≤|CT_CV|, preferably, 150 MPa≤|CT_CV|≤250 MPa, more preferably, 180 MPa≤|CT_CV|≤250 MPa, wherein |CT_CV| is the absolute value of the maximum tensile stress.

[0235] In some embodiments, the |CT_CV| of the chemically strengthened glass-ceramics can be 150.00 MPa to 250.00 MPa, 150.00 MPa to 180.00 MPa, 150.00 MPa to 240.00 MPa, 190.00 MPa to 230.00 MPa, or 200.00 MPa to 230.00 MPa. In some embodiments, the |CT_CV| of the chemically strengthened glass-ceramics can be 150.00 MPa, 160.00 MPa, 170.00 MPa, 180.00 MPa, 190.00 MPa, 200.00 MPa, 210.00 MPa, 220.00 MPa, 230.00 MPa, 240.00 MPa, 250.00 MPa, 226.68 MPa, 193.35 MPa, 215.52 MPa, 224.35 MPa, 209.26 MPa, 217.21 MPa, 216.52 MPa, 222.24 MPa, 234.28 MPa, 202.79 MPa, 201.74 MPa, 218.25 MPa, 219.42 MPa, or 207.75 MPa, or a value within a range defined by any two of the above specific values as endpoints, as long as a chemically strengthened glass-ceramic 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-ceramic with desired properties of the present application is obtained.

[0236] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfy: 100.00 MPa≤|CT_AV|, preferably, 100.00 MPa≤|CT_AV|≤160.00 MPa, more preferably, 130.00 MPa≤|CT_AV|≤160.00 MPa, wherein |CT_AV| is the absolute value of the average tensile stress.

[0237] In some embodiments, the |CT AV| of the chemically strengthened glass-ceramics can be 100.00 MPa to 160.00 MPa, 100.00 MPa to 125.00 MPa, 105.00 MPa to 120.00 MPa, 100.00 MPa to 150.00 MPa, or 110.00 MPa to 115.00 MPa. In some embodiments, the |CT AV| of the chemically strengthened glass-ceramics can be 100.00 MPa, 110.00 MPa, 120.00 MPa, 125.00 MPa, 130.00 MPa, 135.00 MPa, 140.00 MPa, 150.00 MPa, 160.00 MPa, 145.28 MPa, 135.44 MPa, 147.26 MPa, 142.53 MPa, 138.79 MPa, 150.24 MPa, 144.35 MPa, 146.02 MPa, 142.02 MPa, 139.69 MPa, 140.56 MPa, 139.63 MPa, 142.25 MPa, or 138.91 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 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 desired properties of the present application can be obtained.

[0238] It should be understood that the "surface composition" in the present application can be the material composition or the composition distribution of the surface of the substrate glass, the glass-ceramics, or the chemically strengthened glass-ceramics, can be the mass percentage of a certain component, the molar percentage of a certain component, the mass percentage relationship between two or more material compositions, the mass content relationship between two or more material compositions, can be the molar content relationship between two or more material compositions, can be a combination of the above-mentioned items, and the like. For example, the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramics or the mass percentage of K2O on the surface of the chemically strengthened glass-ceramics, for example, the mass percentage of Na2O on the surface of the chemically strengthened glass-ceramics and the mass percentage of K2O on the surface of the chemically strengthened glass-ceramics.

[0239] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfy: Na2O ≥ 5.0%, preferably 5.0% to 20%, more preferably 6% to 17%, wherein M Na2O is the mass percentage of M Na2O on the surface of the chemically strengthened glass-ceramics.

[0240] In some embodiments, the mass percentage M of Na2O on the surface of the chemically strengthened glass-ceramics Na2O may 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%, 15%, 16%, 17%, 18%, 19%, 20%, 12.87%, 7.93%, 10.85%, 12.63%, 13.02%, 13.63%, 15.25%, 16.16%, 12.75%, 12.18%, 11.95%, 11.26%, or 12.14%, or a value within a range between 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.

[0241] In some embodiments of the present application, the chemically strengthened glass-ceramics satisfies: K2O ≤ 3.0%, preferably 0.2% to 2%, more preferably 0.3% to 1.6%, wherein M K2O is the mass percentage of K2O on the surface of the chemically strengthened glass-ceramics.

[0242] In some embodiments, the mass percentage M of K2O on the surface of the chemically strengthened glass-ceramics K2O may be 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 1.33%, 1.21%, 1.47%, 1.48%, 1.42%, 1.57%, 1.32%, 1.43%, 1.36%, 1.41%, 1.54%, 1.5%, or 1.52%, or a value within a range between 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.

[0243] In some embodiments of the present application, after the two main surfaces of the chemically strengthened glass-ceramics are each thinned by 3 μm in thickness, the thinned chemically strengthened glass-ceramics satisfies: K2O and the mass percentage M’ of Na2O on the surface of the chemically strengthened glass-ceramics satisfies: Na2O

[0244] M’​K2O <3.0%, preferably 0.0% to 1%, more preferably 0.1% to 0.5%,

[0245] M' Na2O <15.0%, preferably 3.0% to 14%, more preferably 4% to 12%.

[0246] In some embodiments, M' K2O may be 0.00%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 1%, 1.5%, 2%, 2.5%, 0.300%, 0.289%, 0.318%, 0.321%, 0.315%, 0.301%, 0.326%, 0.305%, 0.322%, 0.319%, or 0.325%, or can be a value within a range of values between any two of the foregoing specifically enumerated values as endpoints, as long as the chemically strengthened glass has the desired properties. 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 has the desired properties.

[0247] In some embodiments, M' Na2O may be 3.00%, 4.00%, 5.00%, 6.00%, 7.00%, 8.00%, 9.00%, 10.00%, 11.00%, 12.00%, 13.00%, 14.00%, 8.40%, 5.03%, 6.78%, 8.31%, 8.86%, 8.81%, 9.02%, 9.55%, 9.71%, 8.36%, 8.07%, 8.01%, 7.83%, or 8.08%, or can be a value within a range of values between any two of the foregoing specifically enumerated values as endpoints, as long as the chemically strengthened glass has the desired properties. 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 has the desired properties.

[0248] It should be understood that the chemically strengthened glass of the present application is made from a glass-ceramic that is chemically strengthened, and that the mass percentages of Na2O and K2O on the surface of the chemically strengthened glass are different from the mass percentages of Na2O and K2O on the surface of the chemically strengthened glass after each of the two major surfaces of the chemically strengthened glass is thinned by 3 μιη in the thickness direction. This is because, during the chemical strengthening process, ion exchange occurs in the glass-ceramic, and smaller alkali metal ions (e.g., Li + or Na + ) are replaced by larger alkali metal ions (e.g., Na + or K+ ) are replaced, and the microcrystalline glass surface layer is directly in contact with the salt bath, and the hindrance from the glass matrix is small, so the surface layer exchange rate is greater, and it is easier for larger alkali metal ions (e.g., Na + or K + ) to enter, but as the ion exchange progresses, the ions in the interior are ion-exchanged, and the hindrance from the glass matrix is higher, so it is more difficult to proceed, and therefore, compared to the chemically strengthened microcrystalline glass whose two main surfaces are each thinned by 3 μm along the thickness direction, the mass percentages of Na2O and K2O on the surface of the thinned chemically strengthened microcrystalline glass are higher than the mass percentages of Na2O and K2O on the surface of the chemically strengthened microcrystalline glass that has not been thinned.

[0249] It should be understood that the chemically strengthened microcrystalline glass of the present application is made from a microcrystalline glass that is subjected to a chemical strengthening treatment, and the composition at the center of the chemically strengthened microcrystalline glass is the same as or substantially the same as the composition of the microcrystalline glass. Compared to the microcrystalline glass before the chemical strengthening treatment, the composition at the surface of the microcrystalline glass product after the chemical strengthening treatment can be different from the composition of the microcrystalline glass before the chemical strengthening treatment. This is because, during the chemical strengthening treatment, ion exchange occurs, and when ion exchange occurs, in the just-formed microcrystalline glass, one type of alkali metal ion (e.g., Li + or Na + ) at the surface of the microcrystalline glass is replaced by a larger alkali metal ion (e.g., Na + or K + ). However, in embodiments, the glass composition and phase assembly at or near the depth or thickness center of the microcrystalline glass product still have the composition and phase assembly of the just-formed microcrystalline glass. That is, in the present application, the composition (e.g., the composition of the tensile stress layer) and phase assembly at the center of the chemically strengthened microcrystalline glass are the same as or substantially the same as those of the microcrystalline glass that has not been subjected to a chemical strengthening treatment.

[0250] In the present application, the microcrystalline glass used to prepare the chemically strengthened microcrystalline glass can be made from a base glass that is subjected to heat treatment, and the composition of the base glass is the same as or substantially the same as the composition of the microcrystalline glass, in terms of mole percent or mass percent of oxides.

[0251] In some embodiments of the present application, the composition of the substrate 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 tensile stress layer comprises, in mole percent of oxides: SiO2: 58-66%, Al2O3: 0-3.5%, P2O5: 1-2.5%, ZrO2: 3.5-5.5%, Li2O: 22-32%, SrO: 0-2.5%, Na2O: 0-3%. By adjusting and controlling the content range of each oxide component, a specific glass composition is met, which is conducive to obtaining a glass-ceramic satisfying a specific crystal phase structure, and is conducive to obtaining a chemically strengthened glass-ceramic satisfying a specific stress structure.

[0252] In some embodiments of the present application, the composition of the substrate 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 tensile stress layer further comprises, in mole percent of oxides: K2O: 0-1%, CaO: 0-1.5%, B2O3: 0-1%, Ta2O5: 0-1%, BaO: 0-2.5%.

[0253] It should be understood that the measurement method of the composition of the substrate 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 tensile stress layer can be converted by conversion, for example, the above measurement method in mole percent of oxides can be converted into measurement in mass percent of oxides.

[0254] In some embodiments of the present application, the composition of the substrate 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 tensile stress layer comprises, in mass percent of oxides: SiO2: 60-70%, Al2O3: 0-6%, P2O5: 2-8%, ZrO2: 8-12%, Li2O: 10-20%, SrO: 0-6%, Na2O: 0-3%. In some embodiments of the present application, the composition of the substrate 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 tensile stress layer further comprises, in mass percent of oxides: K2O: 0-2%, CaO: 0-2%, B2O3: 0-1%, Ta2O5: 0-2%, BaO: 0-6%.

[0255] In the present application, Si02 is a network former oxide of the glass network and is an indispensable component of the glass network structure. At the same time, Si02 is also an important component of the main crystalline phase lithium disilicate (Li2Si205) crystalline phase. Properly increasing the content of Si02 can increase the stability and mechanical strength of the glass, which is conducive to ensuring the precipitation of lithium disilicate crystalline phase with a desired content. However, excessive Si02 will increase the viscosity of the base glass, making it difficult to melt the glass, thereby reducing the formability of the base glass. Therefore, in order to meet the glass formability requirements and achieve the desired crystallization effect of the present application, and thus obtain the desired glass-ceramic or chemically strengthened glass-ceramic product of the present application, in the present application, the molar percentage content of Si02 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center or the tensile stress layer of the chemically strengthened glass-ceramic is 58% to 66%, or the mass percentage content of Si02 is 60% to 70%.

[0256] In some embodiments, the molar percentage of Si02 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center or the tensile stress layer of the chemically strengthened glass-ceramic can be 58% to 66%, 60% to 65%, 60.5% to 64.5%, or 60.5% to 63%, in terms of mole percentage of oxide. In some embodiments, the molar percentage of Si02 in the composition of the base glass or the composition of the glass-ceramic or the composition at the center or the tensile stress layer of the chemically strengthened glass-ceramic can be 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 60.94%, 61.15%, 61.22%, 61.43%, 61.72%, or 62.22%, in terms of mole percentage of oxide, or can be a value within a numerical range formed by any two of the above specific numerical values as endpoints, as long as a glass-ceramic or chemically strengthened glass-ceramic 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 a glass-ceramic or chemically strengthened glass-ceramic with the desired properties of the present application can be obtained.

[0257] In some embodiments, the mass percent of Si02in 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 tensile stress layer can be 60-70%, 62-68%, 63-67%, or 63-66.5%, in terms of mass percent of oxides. In some embodiments, the mass percent of Si02in 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 tensile stress layer can be 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 65.92%, 66.06%, 63.98%, 63.44%, 63.31%, 64.45%, 65.72%, 65.54%, or 63.87%, in terms of mass percent of oxides, or a value within a range between any two of the foregoing specific values, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties can be 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 glass-ceramic or a chemically strengthened glass-ceramic with desired properties can be obtained.

[0258] In the present application, Al203is an optional component. The addition of an appropriate amount of Al203helps to promote ion exchange to some extent during the chemical strengthening process, but an excessive amount of Al203may increase the viscosity of the glass and easily lead to the precipitation of other crystalline phases, such as petalite, which affects the crystalline phase structure of the glass-ceramic. Therefore, in order to achieve the desired crystalline phase structure and the desired properties of the glass-ceramic or the chemically strengthened glass-ceramic, the mole percent of Al203in 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 tensile stress layer is 0-3.5%, or the mass percent of Al203in 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 tensile stress layer is 0-6%.

[0259] In some embodiments, the mole percent of AI2O3 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 range from 0% to 3.5%, from 1% to 3.5%, from 1% to 2.5%, from 0% to 2.5%, from 0.1% to 2%, or from 1% to 2%, in terms of mole percent of oxide. In some embodiments, the mole percent of AI2O3 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%, 0.2%, 0.4%, 0.6%, 0.8%, 1%, 1.2%, 1.5%, 1.6%, 1.8%, 2%, 2.2%, 2.4%, 2.5%, 3%, 3.5%, 1.22%, 1.37%, 1.38%, or 1.4%, in terms of mole percent of oxide, or a value within a range bounded by any two of the foregoing specific values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present application is obtained. It should 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 with the desired properties of the present application is obtained.

[0260] In some embodiments, the mass percent of AI2O3 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 range from 0% to 6%, from 1% to 6%, from 2% to 6%, from 0% to 5%, from 0.1% to 4%, from 2% to 3%, or from 1.5% to 3.5%, in terms of mass percent of oxide. In some embodiments, the mass percent of AI2O3 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%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 2.52%, 2.51%, 2.43%, 2.41%, 2.15%, 2.48%, or 2.45%, in terms of mass percent of oxide, or a value within a range bounded by any two of the foregoing specific values as endpoints, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present application is obtained. It should 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 with the desired properties of the present application is obtained.

[0261] In the present application, P2O5 is a glass-forming oxide of the glass, which exists in the network structure as a phosphorus oxygen tetrahedron [PO4]. P2O5 preferentially appears during heat treatment, first causing the glass to phase separate and segregate, forming an amorphous precursor phase Li3PO4, and then, with Li3PO4 as a heterogeneous nucleation point, lithium silicate crystalline phases grow in dependence on the amorphous Li3PO4. With the increase of P2O5 content, the heterogeneous nucleation points increase, and the grains with Li3PO4 as the nucleation point are effectively refined, which is beneficial to improve the overall transmittance of the glass-ceramics, the uniformity of the glass, and reduce the b value. However, when the P2O5 content is too high, more Li3PO4 crystals are generated, which makes the Li2O content for forming lithium silicate insufficient, and further causes the base glass to easily precipitate quartz crystals, resulting in the decrease of the transmittance of the glass-ceramics and the optical uniformity of the glass-ceramics as a whole. When the P2O5 content is too low, the precipitated crystals are too large, which easily causes the glass to lose transparency. Therefore, in order to achieve the desired crystallization effect of the present application and obtain the desired performance of the glass-ceramics or chemically strengthened glass-ceramics, the molar percentage content of P2O5 in the composition of the base glass or the composition of the glass-ceramics or the composition at the center of the chemically strengthened glass-ceramics or the composition of the tensile stress layer is 1% to 2.5%, or the mass percentage content of P2O5 is 2% to 8%.

[0262] In some embodiments, the molar percentage of P2O5 in the composition of the base glass or the composition of the glass-ceramics or the composition at the center of the chemically strengthened glass-ceramics or the composition of the tensile stress layer, in terms of mole percentage of oxide, can be 1% to 2.5%, 1% to 2%, 1.2% to 2%, or 1.5% to 2%. In some embodiments, the molar percentage of P2O5 in the composition of the base glass or the composition of the glass-ceramics or the composition at the center of the chemically strengthened glass-ceramics or the composition of the tensile stress layer, in terms of mole percentage of oxide, can be 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%, 1.82%, 1.83%, 1.84%, 1.85%, or 1.86%, or a value within a range formed by any two of the above specific numerical values as endpoints, as long as a glass-ceramics or 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 chemically strengthened glass-ceramics with the desired performance of the present application can be obtained.

[0263] In some embodiments, the mass percent of P2O5 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 tensile stress layer can be 2% to 8%, 3% to 6%, 3% to 5%, or 4% to 4.8%, in terms of mass percent of oxides. In some embodiments, the mass percent of P2O5 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 tensile stress layer can be 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 4.66%, 4.68%, 4.54%, 4.49%, 4.55%, 4.56%, 4.65%, 4.64%, or 4.52%, in terms of mass percent of oxides, or can be a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or 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 ranges can be combined with any other range, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application can be obtained.

[0264] In the present application, ZrO2 is an intermediate oxide for glass formation, and an appropriate amount of ZrO2 can improve the chemical stability of the glass, increase the hardness of the glass, and increase the scratch resistance and drop resistance of the glass. In addition, due to the high cation charge and strong field of ZrO2, ZrO2 has a large accumulation effect on the structure of the glass, and is also commonly used as a nucleating agent in glass-ceramics. In the present application, the greater the content of ZrO2, the higher the stress of the system, and the more ideal the stress effect. However, too high a content of ZrO2 can deteriorate the optical properties of the glass-ceramic. Therefore, in order to meet the requirements of glass forming and achieve the desired strength effect of the present application, the molar percent content of ZrO2 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 tensile stress layer is 3.5% to 5.5%, or the mass percent content of ZrO2 is 8% to 12%.

[0265] 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 3.5% to 5.5%, 4% to 5%, 4.2% to 5%, or 4% to 4.8%, in terms of mole percent of oxides. 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 3.5%, 4%, 4.5%, 5%, 5.5%, 4.47%, 4.57%, 4.59%, 4.6%, 4.61%, or 4.66%, or a value within a range between any two of the foregoing specific values, in terms of mole percent of oxides, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present application is obtained. It is understood that in specific embodiments, any of the foregoing ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present application is obtained.

[0266] In some embodiments, the mass 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 8% to 12%, 8% to 11%, 9% to 11%, or 9.2% to 10.5%, in terms of mass percent of oxides. In some embodiments, the mass 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 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12%, 10.12%, 9.84%, 9.72%, 9.52%, 9.98%, 9.88%, 10.07%, 10.04%, or 9.79%, or a value within a range between any two of the foregoing specific values, in terms of mass percent of oxides, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present application is obtained. It is understood that in specific embodiments, any of the foregoing ranges can be combined with any of the other ranges, as long as a glass-ceramic or a chemically strengthened glass-ceramic with the desired properties of the present application is obtained.

[0267] In the present application, Li2O as an essential component is a network modifier oxide which not only can improve the viscosity of the glass, promote the melting and fining of the glass melt, but also is one of the main components to form lithium disilicate crystals. Meanwhile, Li2O can also provide alkali lithium ions for ion exchange with the large radius ions in the molten salt bath, which is an important factor affecting the stress level of the chemical strengthened glass-ceramics. However, excessive Li2O can lead to poor stability of the glass crystallization process, and even precipitate other undesirable crystal phases, which can deteriorate the optical properties of the glass-ceramics. Therefore, in order to obtain the glass-ceramics or the chemical strengthened glass-ceramics which meet the desired crystal phase structure, optical properties and mechanical strength properties, the molar percentage content of Li2O in the composition of the base glass or the composition of the glass-ceramics or the composition at the center or the tensile stress layer of the chemical strengthened glass-ceramics is 22% to 32%, or the mass percentage content of Li2O is 10% to 20%.

[0268] In some embodiments, the molar percentage of Li2O in the composition of the base glass or the composition of the glass-ceramics or the composition at the center or the tensile stress layer of the chemical strengthened glass-ceramics can be 22% to 32%, 23% to 31%, 24% to 30%, 25% to 31%, 27% to 30.5%, or 28.5% to 29.8%, in terms of mole percentage of oxides. In some embodiments, the molar percentage of Li2O in the composition of the base glass or the composition of the glass-ceramics or the composition at the center or the tensile stress layer of the chemical strengthened glass-ceramics can be 22%, 22.5%, 23%, 23.5%, 24%, 24.5%, 25%, 25.5%, 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, 30%, 30.5%, 31%, 31.5%, 32%, 29.25%, 29.38%, 29.39%, 29.4%, or 29.52%, in terms of mole percentage of oxides, or can be a value within a numerical range formed by any two of the above specific numerical values as endpoints, as long as the glass-ceramics or the chemical 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 the chemical strengthened glass-ceramics with the desired properties of the present application can be obtained.

[0269] In some embodiments, the mass 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 10-20%, 11-18%, 12-16%, 15-16%, 14-17%, or 13-16.5%, in terms of mass percent of oxides. In some embodiments, the mass 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 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5%, 15%, 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, 19.5%, 20%, 15.49%, 15.71%, 15.28%, 15.09%, 15.11%, 15.47%, 15.33%, 15.63%, 15.59%, or 15.19%, in terms of mass percent of oxides, or a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or 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 ranges can be combined with any other range, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application can be obtained.

[0270] In the present application, SrO as an optional component is an alkaline earth metal oxide. An appropriate amount of SrO can adjust the composition of the glass phase in the glass-ceramic, which helps to increase the density of the glass-ceramic and increase the Young's modulus. At the same time, it is also beneficial to reduce the thermal expansion softening point of the glass-ceramic, and thus to facilitate the hot bending of the glass-ceramic into a 3D curved glass-ceramic. However, excessive SrO can deteriorate the optical performance 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 content of SrO 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 is 0-2.5%, or the mass percent content of SrO is 0-6%.

[0271] In some embodiments, the mole percent of SrO 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 range from 0% to 2.5%, from 0% to 2%, or from 0% to 1.9%, in terms of mole percent of oxide. In some embodiments, the mole percent of SrO 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%, 2%, 2.5%, 1.38%, 1.83%, or a value within a range bounded by any two of these specifically enumerated values, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties 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 glass-ceramic or a chemically strengthened glass-ceramic with desired properties can be obtained.

[0272] In some embodiments, the mass percent of SrO 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%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 2.52%, 3.33%, or a value within a range bounded by any two of these specifically enumerated values, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties 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 glass-ceramic or a chemically strengthened glass-ceramic with desired properties can be obtained.

[0273] In the present application, Na2O is an optional component and is an interstitial oxide. An appropriate amount of Na2O can provide free oxygen, improve the viscosity of the glass, promote melting and fining of the glass melt, and also adjust the rate of chemical strengthening, but an excessive amount of Na2O can not only reduce the crystallinity of the glass-ceramic, but also affect the chemical strengthening effect. Therefore, in order to ensure that the glass-ceramic or the chemically strengthened glass-ceramic meets the desired structure and obtains the desired properties, the mole percent of Na2O 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 range from 0% to 3%, or the mass percent of Na2O can range from 0% to 3%.

[0274] 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 range from 0% to 3%, from 0% to 2.6%, or from 0% to 1%, in terms of mole percent of oxide. 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%, 2.5%, 2.6%, 3%, or 0.46%, in terms of mole percent of oxide, or a value within a range having any two of these specifically enumerated values as endpoints, provided that the resulting glass-ceramic or chemically strengthened glass-ceramic has the desired properties. It will be understood that any of the above-mentioned ranges can be combined with any of the other ranges, provided that the resulting glass-ceramic or chemically strengthened glass-ceramic has the desired properties.

[0275] In some embodiments, the mass 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 range from 0% to 3%, from 0% to 2.6%, or from 0% to 1%, in terms of mass percent of oxide. In some embodiments, the mass 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%, 2.5%, 2.6%, 3%, or 0.51%, in terms of mass percent of oxide, or a value within a range having any two of these specifically enumerated values as endpoints, provided that the resulting glass-ceramic or chemically strengthened glass-ceramic has the desired properties. It will be understood that any of the above-mentioned ranges can be combined with any of the other ranges, provided that the resulting glass-ceramic or chemically strengthened glass-ceramic has the desired properties.

[0276] In the present application, K20 is an interstitial oxide and is one of the optional components. An appropriate amount of K20 can provide free oxygen to increase the SiO2 / O ratio in the glass structure, but too much K20 can affect the glass network structure, affecting the optical properties, thermal stability, chemical stability, mechanical strength, and weather resistance of the glass. Therefore, to ensure that the glass-ceramic or chemically strengthened glass-ceramic meets the desired structure and obtains the desired properties, the mole percent of K20 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 range from 0% to 1%, or the mass percent of K20 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 range from 0% to 2%.

[0277] In some embodiments, the mole percent of K2O in the base glass composition or the glass-ceramic composition or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or 0.46%, or can be a value within a range having any two of the above specifically recited 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 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.

[0278] In some embodiments, the mass percent of K2O in the base glass composition or the glass-ceramic composition or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer can be 0%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, or 0.77%, or can be a value within a range having any two of the above specifically recited 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 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.

[0279] In the present application, CaO is an optional component as a network-modifying oxide of the glass. An appropriate amount of CaO helps to reduce the high temperature viscosity of the glass and increase the density of the glass. However, an excessive amount of CaO can make the glass too short and brittle. Therefore, to obtain a glass-ceramic or a chemically strengthened glass-ceramic having the desired optical and mechanical strength properties, the mole percent of CaO in the base glass composition or the glass-ceramic composition or the composition at the center of the chemically strengthened glass-ceramic or the composition of the tensile stress layer can be 0% to 1.5%, or the mass percent of CaO can be 0% to 2%.

[0280] In some embodiments, the mole 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%, 0.95%, or 0.92%, or a value within a range having any two of the above specifically stated values as endpoints, as long as the glass-ceramic or the chemically strengthened glass-ceramic having the desired properties can be obtained. It is understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as the glass-ceramic or the chemically strengthened glass-ceramic having the desired properties can be obtained.

[0281] In some embodiments, the mass 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%, 2%, 0.95%, or 0.92%, or a value within a range having any two of the above specifically stated values as endpoints, as long as the glass-ceramic or the chemically strengthened glass-ceramic having the desired properties can be obtained. It is understood that in specific embodiments, any of the above ranges can be combined with any of the other ranges, as long as the glass-ceramic or the chemically strengthened glass-ceramic having the desired properties can be obtained.

[0282] In the present application, B2O3 is an optional component, and an appropriate amount of B2O3 can be used as a fluxing agent and / or a softening agent, which helps to improve the forming and heat bending effects of the glass. However, an excessive amount of B2O3 can cause an uncontrollable crystallization process, resulting in poor optical performance of the glass-ceramic. Therefore, in order to obtain a glass-ceramic or a chemically strengthened glass-ceramic that satisfies the desired optical performance and mechanical strength performance, the mole percent of B2O3 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 is 0% to 1%, or the mass percent of B2O3 is 0% to 1%.

[0283] In some embodiments, the mole percent of B2O3 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%, or 0.46%, or a value within a range having any two of the aforementioned specific numerical 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 to be 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.

[0284] In some embodiments, the mass percent of B2O3 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%, or 0.56%, or a value within a range having any two of the aforementioned specific numerical 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 to be 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.

[0285] In the present application, the optional addition of Ta2O5 helps to increase the density and Young's modulus of the glass-ceramic, but can also increase the refractive index of the glass-ceramic, and thus decrease the optical performance 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 mole percent of Ta2O5 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 is 0% to 1%, or the mass percent of Ta2O5 is 0% to 2%.

[0286] In some embodiments, the mole percent of Ta2O5in 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%, 0.46%, or 1%, or a value within a range having any two of the above specifically stated values as endpoints, as long as the glass-ceramic or the 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 the glass-ceramic or the chemically strengthened glass-ceramic having the desired properties herein is obtained.

[0287] In some embodiments, the mass percent of Ta2O5in 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%, 1.2%, 1.5%, 1.8%, 2%, 1.3%, or 1%, or a value within a range having any two of the above specifically stated values as endpoints, as long as the glass-ceramic or the 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 the glass-ceramic or the chemically strengthened glass-ceramic having the desired properties herein is obtained.

[0288] In the present application, BaO, as an optional component, is an alkaline earth metal oxide. An appropriate amount of BaO can function to adjust the composition of the glass phase in the glass-ceramic, which helps to increase the density of the glass-ceramic and increase its Young's modulus. However, an excessive amount of BaO can deteriorate the optical properties 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 mole percent of BaO 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% to 2.5%, or the mass percent of BaO can be 0% to 6%.

[0289] In some embodiments, the molar percent of BaO 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%, 1.9%, 2%, 2.5%, 1.37%, 1.38%, or 1.83%, or a value within a range having any two of the above specifically stated values as endpoints, as long as the glass-ceramic or the chemically strengthened glass-ceramic having the desired properties herein can be obtained. It will be understood that any of the above ranges can be combined with any of the other ranges, as long as the glass-ceramic or the chemically strengthened glass-ceramic having the desired properties herein can be obtained.

[0290] In some embodiments, the mass percent of BaO 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%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 3.65%, 3.68%, or 4.85%, or a value within a range having any two of the above specifically stated values as endpoints, as long as the glass-ceramic or the chemically strengthened glass-ceramic having the desired properties herein can be obtained. It will be understood that any of the above ranges can be combined with any of the other ranges, as long as the glass-ceramic or the chemically strengthened glass-ceramic having the desired properties herein can be obtained.

[0291] In some embodiments of the present application, the chemically strengthened glass-ceramic satisfies 2.00≤n(SiO2) / n(Li2O)≤2.40, preferably 2.00≤n(SiO2) / n(Li2O)≤2.30, more preferably 2.02≤n(SiO2) / n(Li2O)≤2.20, wherein n(SiO2) is the molar percent content of SiO2 at the center of the chemically strengthened glass-ceramic or in the compressive stress layer, and n(Li2O) is the molar percent content of Li2O at the center of the chemically strengthened glass-ceramic or in the compressive stress layer. It should be noted that in the present application, the content of each oxide in the content relationship formula is the content percentage of the oxide in moles, and the mole unit does not participate in the calculation of the formula. By adjusting the content of each oxide to satisfy a specific content relationship, a glass-ceramic or a chemically strengthened glass-ceramic satisfying the desired mechanical strength performance can be obtained.

[0292] In some embodiments, n(Si02) / n(Li20) can have a value of 2, 2.1, 2.2, 2.3, 2.4, 2.08, 2.09, or 2.12, or a value within a range between any two of the foregoing specific numerical values, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties can be 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 glass-ceramic or a chemically strengthened glass-ceramic with desired properties can be obtained.

[0293] In some embodiments of the present application, the chemically strengthened glass-ceramic satisfies 90%≤n(Si02)+n(Li20)≤95%, preferably, 90%≤n(Si02)+n(Li20)≤92%, wherein n(Si02) is the molar percentage content of Si02 in the center of the chemically strengthened glass-ceramic or in the tensile stress layer, and n(Li20) is the molar percentage content of Li20 in the center of the chemically strengthened glass-ceramic or in the tensile stress layer. By adjusting the content of each oxide to satisfy a specific content relationship, a glass-ceramic or a chemically strengthened glass-ceramic satisfying desired mechanical strength properties can be obtained.

[0294] In some embodiments, n(Si02)+n(Li20) can have a value of 90%, 91%, 92%, 93%, 94%, 95%, 90.19%, 90.4%, 90.62%, 90.82%, 91.24%, or 91.62%, or a value within a range between any two of the foregoing specific numerical values, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties can be 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 glass-ceramic or a chemically strengthened glass-ceramic with desired properties can be obtained.

[0295] In the present application, by adjusting and controlling the content relationship of Si02 and Li20, it is beneficial to ensure that a glass-ceramic satisfying desired properties and having lithium disilicate as the main crystalline phase structure is obtained, and it is also beneficial to achieve a desired stress distribution structure.

[0296] In the present application, "lithium disilicate crystal phase has a higher mass percentage than other crystal phases present in the chemically strengthened microcrystalline glass" or "lithium disilicate is the main crystal phase" or other similar expressions refer to the mass of lithium disilicate crystal phase accounts for more than 80 mass percent (mass% or wt%) of all crystal phases of the microcrystalline glass for preparing chemically strengthened microcrystalline glass or chemically strengthened microcrystalline glass according to the embodiments of the present application. In some embodiments of the present application, the mass of lithium disilicate crystal phase accounts for 80wt% to 100wt% of all crystal phases in the microcrystalline glass for preparing chemically strengthened microcrystalline glass or chemically strengthened microcrystalline glass, preferably, the mass of lithium disilicate crystal phase accounts for 85wt% to 100wt% of all crystal phases in the microcrystalline glass or chemically strengthened microcrystalline glass. In some embodiments, the mass of lithium disilicate crystal phase can account for 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 in the microcrystalline glass for preparing chemically strengthened microcrystalline glass or chemically strengthened microcrystalline glass, or can be a value within the range of any two specific values as endpoints, as long as the 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 the microcrystalline glass or chemically strengthened microcrystalline glass with the required properties of the present application can be obtained.

[0297] In the present application, the crystallinity of the microcrystalline glass for preparing chemically strengthened microcrystalline glass does not change significantly after being chemically strengthened to obtain chemically strengthened microcrystalline glass, and the crystallinity of the microcrystalline glass is similar or substantially the same as the crystallinity of the chemically strengthened microcrystalline glass.

[0298] In some embodiments of the present application, the crystallinity of the glass-ceramic or the chemically strengthened glass-ceramic for preparing the chemically strengthened glass-ceramic is not less than 60%, preferably, the crystallinity of the glass-ceramic or the chemically strengthened glass-ceramic for preparing the chemically strengthened glass-ceramic is 70%-90%, more preferably, the crystallinity of the glass-ceramic or the chemically strengthened glass-ceramic for preparing the chemically strengthened glass-ceramic is 70%-80%. The higher the crystallinity of the glass-ceramic or the chemically strengthened glass-ceramic for preparing the chemically strengthened glass-ceramic, the more conducive to obtaining 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 the chemical strengthening time of the chemically strengthened glass-ceramic with high stress level being prolonged, 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 conducive to making the chemically strengthened glass-ceramic prepared therefrom also meet the desired crystallinity, and it is more conducive to obtaining the chemically strengthened glass-ceramic meeting the desired high mechanical strength performance, high damage resistance performance and excellent optical performance.

[0299] In some embodiments, the crystallinity of the glass-ceramic or the chemically strengthened glass-ceramic for preparing the chemically strengthened glass-ceramic can be 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 76.7%, 76.6%, 70.89%, 70.69%, 73.77%, 70.4%, 75.45%, 75.61%, 71.32% or 72.29%, or can be a value within a value range constituted by any two specific values as endpoints, as long as the glass-ceramic or the chemically strengthened glass-ceramic with the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the glass-ceramic or the chemically strengthened glass-ceramic with the required performance of the present application can be obtained.

[0300] In some embodiments of the present application, the average grain size in the glass-ceramic or the chemically strengthened glass-ceramic for preparing the chemically strengthened glass-ceramic is not more than 50 nm, preferably, the average grain size is 10 nm-40 nm, more preferably, the average grain size is 15-30 nm. The appropriate average grain size is conducive to making the glass-ceramic have excellent optical performance and high intrinsic strength, and if the average grain size is too high, the glass-ceramic is easy to lose transparency. In the present application, by making the glass-ceramic or the chemically strengthened glass-ceramic meet the appropriate average grain size, it is conducive to ensuring that the glass-ceramic or the chemically strengthened glass-ceramic realizes excellent mechanical strength performance and excellent optical performance.

[0301] In some embodiments, the average grain size of the glass-ceramic or the chemically strengthened glass-ceramic used to prepare the chemically strengthened glass-ceramic can be 50 nm, 40 nm, 35 nm, 30 nm, 25 nm, 20 nm, 15 nm, 10 nm, 22.8 nm, 23.0 nm, 26.4 nm, 23.3 nm, 25.6 nm, 24.3 nm, 24.1 nm, or 26.0 nm, or can be a value within a range defined by any two of the above specific values as endpoints, as long as a glass-ceramic or 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 ranges can be combined with any other range, as long as a glass-ceramic or a chemically strengthened glass-ceramic with desired properties of the present application can be obtained.

[0302] In some embodiments of the present application, non-limiting examples of other possible crystalline phases in the glass-ceramic or the chemically strengthened glass-ceramic used to prepare the chemically strengthened glass-ceramic include: petalite crystalline phase, and / or, lithium phosphate crystalline phase. In some embodiments, the mass percentage of the petalite crystalline phase contained in the glass-ceramic or the chemically strengthened glass-ceramic is less than or equal to 10%, preferably, the mass percentage of the petalite crystalline phase in the glass-ceramic or the chemically strengthened glass-ceramic is less than or equal to 5%, more preferably, the glass-ceramic or the chemically strengthened glass-ceramic does not contain petalite crystalline phase. By controlling the precipitation of other crystalline phases (such as petalite crystalline phase), it is more conducive to ensure that the lithium disilicate crystalline phase forms the desired microstructure, thereby ensuring that the glass-ceramic or the chemically strengthened glass-ceramic obtains high mechanical strength performance, excellent optical performance, and excellent damage resistance.

[0303] In some embodiments of the present application, the b value of the glass-ceramic or the chemically strengthened glass-ceramic used to prepare the chemically strengthened glass-ceramic is <1.0, preferably, the b value is <0.80, more preferably, the b value is <0.60, when the thickness is not more than 0.70 mm. It should be understood that in the present application, the optical performance of the glass-ceramic does not change significantly after the glass-ceramic is chemically strengthened to obtain the chemically strengthened glass-ceramic, that is, the b value, transmittance, etc. of the glass-ceramic are similar 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 in transmittance mode to test the b value, and the result is shown as b(D65). The smaller the b value, the better the display effect of the glass-ceramic can be ensured. When the b value is large, the glass-ceramic will have an undesirable color, which will result in a display effect that cannot meet the application requirements of the display cover glass.

[0304] In some embodiments, the b value of the glass-ceramic or chemically strengthened glass-ceramic used to make the chemically strengthened glass-ceramic can be 1.0, 0.9, 0.8, 0.70, 0.65, 0.60, 0.55, 0.50, 0.45, 0.40, 0.35, 0.30, 0.25, 0.20, 0.56, 0.54, 0.52, 0.44, 0.42, 0.47, or 0.41, or can be a value within a range bounded by any two of the foregoing specific values, 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 foregoing 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.

[0305] In some embodiments of the present application, the glass-ceramic or chemically strengthened glass-ceramic used to make the chemically strengthened glass-ceramic is transparent in the visible wavelength range, preferably, the transmittance of the chemically strengthened glass-ceramic is ≥ 85% for 550 nm wavelength light, preferably, the transmittance is ≥ 90%, more preferably, the transmittance is ≥ 90.2%. The chemically strengthened glass-ceramic satisfying the transmittance can ensure better light transmittance, better 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-740 nm.

[0306] In some embodiments, the transmittance of the glass-ceramic or chemically strengthened glass-ceramic used to make the chemically strengthened glass-ceramic can be 85%, 90%, 90.2%, 91%, 92%, 90.4%, 90.46%, 90.32%, 90.22%, 90.27%, 90.51%, 90.35%, 90.71%, 90.63%, 90.52%, 90.46%, or 90.32% for 550 nm wavelength light, or can be a value within a range bounded by any two of the foregoing specific values, 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 foregoing 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.

[0307] In some embodiments of the present application, the microcrystalline glass or the chemically strengthened microcrystalline glass for preparing the chemically strengthened microcrystalline glass has a Young's modulus of no less than 100 GPa, preferably, a Young's modulus of no less than 110 GPa, more preferably, a Young's modulus of 110 GPa to 130 GPa, and more preferably, a Young's modulus of 114 GPa to 125 GPa. It should be understood that in the present application, the Young's modulus of the microcrystalline glass will not decrease after the microcrystalline glass is subjected to the chemical strengthening treatment to obtain the chemically strengthened microcrystalline glass, that is, when the Young's modulus of the microcrystalline glass is greater than 100 GPa, the Young's modulus of the chemically strengthened microcrystalline glass obtained therefrom should also be greater than 100 GPa. A higher Young's modulus is conducive to ensuring that the chemically strengthened microcrystalline glass has high mechanical strength performance and high damage resistance.

[0308] In some embodiments, the microcrystalline glass or the chemically strengthened microcrystalline glass for preparing the chemically strengthened microcrystalline glass can have a Young's modulus of 100 GPa, 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, 116 GPa, 117 GPa, 118 GPa, 119 GPa, 120 GPa, 125 GPa, 128 GPa, 130 GPa, 117.07 GPa, 114.27 GPa, 120.20 GPa, 122.40 GPa, 120.00 GPa, 116.22 GPa, 118.95 GPa, 114.61 GPa, 114.88 GPa, 118.63 GPa, 114.27 GPa or 120.20 GPa, or can have a value within a numerical range formed by any two of the above specific values as end points, as long as the microcrystalline glass or the chemically strengthened microcrystalline glass having the required performance of the present application can be obtained. It should be understood that in specific embodiments, any of the above ranges can be combined with any other range, as long as the microcrystalline glass or the chemically strengthened microcrystalline glass having the required performance of the present application can be obtained.

[0309] In some embodiments of the present application, the chemically strengthened microcrystalline glass has a Vickers hardness of ≥ 700 kgf / mm 2 , preferably, a Vickers hardness of 700 kgf / mm 2 to 850 kgf / mm 2 . A higher Vickers hardness is conducive to ensuring that the chemically strengthened microcrystalline glass has high mechanical strength performance and high damage resistance.

[0310] In some embodiments, the chemically strengthened microcrystalline glass can have a Vickers hardness of 700 kgf / mm 2 , 710 kgf / mm2 720 kgf / mm 2 730 kgf / mm 2 740 kgf / mm 2 750 kgf / mm 2 760 kgf / mm 2 770 kgf / mm 2 780 kgf / mm 2 790 kgf / mm 2 800 kgf / mm 2 810 kgf / mm 2 820 kgf / mm 2 830 kgf / mm 2 840 kgf / mm 2 or 850 kgf / mm 2 or any value falling within a range defined by any two of the above-mentioned specific numerical 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-mentioned 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.

[0311] In some embodiments of the present application, the glass-ceramic used to make the chemically strengthened glass-ceramic or the chemically strengthened glass-ceramic has a density of not less than 2.54 g / cm 3 , preferably, the density is from 2.54 g / cm 3 to 2.64 g / cm 3 . In some embodiments, the glass-ceramic used to make the chemically strengthened glass-ceramic or the chemically strengthened glass-ceramic has a density of 2.54 g / cm 3 , 2.55 g / cm 3 , 2.56 g / cm 3 , 2.57 g / cm 3 , 2.58 g / cm 3 , 2.59 g / cm 3 , 2.60 g / cm 3 , 2.61 g / cm 3 , 2.62 g / cm 3 , 2.63 g / cm 3 or 2.64 g / cm 3, or can be a value within a range of values between any two of the specific values, as long as the glass-ceramic or chemically strengthened glass-ceramic has the desired properties. It should be understood that any of the above ranges can be combined with any of the other ranges, as long as the glass-ceramic or chemically strengthened glass-ceramic has the desired properties.

[0312] In some embodiments of the application, the glass-ceramic or chemically strengthened glass-ceramic used to make the chemically strengthened glass-ceramic has a refractive index of < 1.60, preferably, a refractive index of 1.55 to 1.60. In some embodiments, the glass-ceramic or chemically strengthened glass-ceramic used to make the chemically strengthened glass-ceramic can have a refractive index of 1.55, 1.56, 1.57, 1.58, 1.59, or 1.60, or can be a value within a range of values between any two of the specific values, as long as the glass-ceramic or chemically strengthened glass-ceramic has the desired properties. It should be understood that any of the above ranges can be combined with any of the other ranges, as long as the glass-ceramic or chemically strengthened glass-ceramic has the desired properties.

[0313] In some embodiments of the application, the glass-ceramic or chemically strengthened glass-ceramic used to make the chemically strengthened glass-ceramic is 2D, 2.5D, 3D, or shaped. In some embodiments of the application, the glass-ceramic or chemically strengthened glass-ceramic used to make the chemically strengthened glass-ceramic is isopachous or anisopachous. One skilled in the art can select as desired. Anisopachous, as used herein, means that the glass-ceramic or chemically strengthened glass-ceramic comprises at least two portions having different thicknesses.

[0314] In some embodiments of the application, the chemically strengthened glass-ceramic is subjected to a sandpaper drop test using 80 grit sandpaper, and the chemically strengthened glass-ceramic has an average sandpaper drop height of > 1.60 m, preferably, an average sandpaper drop height of 1.65 m to 2.50 m, when the thickness is not more than 0.70 mm, preferably, when the thickness is 0.4 mm to 0.7 mm, more preferably, when the thickness is 0.45 mm to 0.55 mm. The greater the average sandpaper drop height value measured, the better the drop damage resistance of the chemically strengthened glass-ceramic.

[0315] In some embodiments, the chemically strengthened glass-ceramics can have an average sandpaper drop height of 1.60 m, 1.65 m, 1.7 m, 1.75 m, 1.8 m, 1.85 m, 1.9 m, 1.95 m, 2 m, 2.1 m, 2.2 m, 2.3 m, 2.4 m, 2.5 m, 1.79 m, 1.67 m, 1.82 m, 1.76 m, or 1.72 m, or a value within a range defined by any two of the above values as endpoints, when subjected to a sandpaper drop test. It should be understood that any of the above ranges can be combined with any other range, as long as the chemically strengthened glass-ceramics have the desired properties.

[0316] In some embodiments of the present application, the chemically strengthened glass-ceramics are subjected to a single rod static pressure test using a 10 mm diameter round head metal rod, and the chemically strengthened glass-ceramics have an average single rod static pressure resistance of greater than 200 N, preferably greater than 230 N. The greater the measured single rod static pressure resistance, the better the resistance to extrusion damage of the chemically strengthened glass-ceramics.

[0317] Having described the composition, crystalline phase structure, and stress structure of the chemically strengthened glass-ceramics, the method of making the chemically strengthened glass-ceramics is described below.

[0318] In the present application, the method of making the chemically strengthened glass-ceramics includes the process of making the glass-ceramics and the process of chemically strengthening the glass-ceramics. The process of making the glass-ceramics includes the process of making the base glass and the process of heat treating the base glass.

[0319] In the present application, the base glass can be made using any conventional method, and the present application is not limited in this regard. For example, the base glass can be made by a float process, overflow process, calendering process, or casting process, but is not limited thereto. For example, the components are mixed according to the formulation, melted, and formed, and then cooled and annealed to obtain the base glass.

[0320] For example, the raw materials (industrial conventional raw materials) are proportioned according to the formula, a refining agent is added, and then the mixture is mixed for a period of time to obtain a raw material mixture with uniform mixing. The raw material mixture is placed in a platinum crucible, a platinum-rhodium crucible, or a furnace, heated to 1450°C-1700°C, preferably maintained at the melting temperature for 5h or more, and then poured into a molding 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°C-650°C, preferably for an annealing time of 10-48h, 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 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 refining agent can be added in an amount of 0-1wt% of the total amount of the raw material.

[0321] 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 both 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 selected, and when a two-step crystallization treatment is used, the second step of the crystallization treatment is to heat the crystallized glass material obtained from the first step of the crystallization treatment to the hot pressing temperature, while performing the 3D hot bending forming treatment and the second step of the crystallization treatment. The "crystallized glass material" here refers to a glass material with a certain degree of crystallinity, but not yet meeting the crystallinity requirements of the final sample.

[0322] In some embodiments of the present application, in order to obtain the desired physical and chemical properties of the microcrystalline glass, the base glass can be subjected to one-step heat treatment, or two-step or multi-step heat treatment when subjected to heat treatment. If one-step heat treatment is performed, it means that the nucleation treatment (i.e., nucleation treatment) is not performed separately, and the nucleation and crystal growth are performed at the temperature reached in the one-step heating process, which can be understood as direct crystallization treatment. If two-step heat treatment is performed, it means that two-step heating process is performed, including but not limited to the following ways, first step of nucleation treatment, second step of crystallization treatment.

[0323] 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 600-800°C, and the crystallization time can be 5-1440 min. During the heat treatment for the nucleation treatment and the crystallization treatment, the heating rate is preferably controlled to be 5-20°C / min, more preferably 10°C / min, and the cooling rate can be 0.1-3°C / min.

[0324] 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 sample can be subjected to shaping treatment, cutting treatment (e.g., cutting using a multi-wire saw), CNC processing (computer numerical control), thinning treatment or polishing treatment, etc.

[0325] In some embodiments of the present application, the chemical strengthening glass-ceramics with desired properties can be obtained by subjecting the aforementioned glass-ceramics to specific chemical strengthening treatment.

[0326] In some embodiments of the present application, the step of polishing and thinning the obtained chemical strengthening glass-ceramics is also included.

[0327] 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 a tensile stress layer in the interior of the glass-ceramics, and obtaining the chemical strengthening glass-ceramics with better mechanical properties.

[0328] In some embodiments of the present application, the chemical strengthening treatment can be a single-step strengthening method or a multi-step strengthening method. The chemical strengthening treatment uses a molten salt bath comprising sodium salt and / or potassium salt. Preferably, the molten salt bath of the present application comprises a mixture of sodium salt and potassium salt, and the temperature of the molten salt bath is preferably 380-600°C, more preferably 430-550°C. In some embodiments of the present application, the concentration of potassium salt in the salt bath is preferably 60-95 wt%, and the concentration of sodium salt is preferably 5-40 wt%, and more preferably, a certain amount (e.g., 0.01-0.3 wt%) of lithium salt is added to the salt bath. In some embodiments of the present application, the chemical strengthening treatment is preferably performed for 0.1-24 hours. In some embodiments of the present application, 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.

[0329] In the present application, the stress distribution structure of the chemically strengthened glass-ceramics is closely related to the composition of the glass-ceramics (including the oxide composition and the crystalline phase composition), the composition of the salt bath, the temperature of the salt bath, and the time of the chemical strengthening treatment. Only when a glass-ceramics with a specific composition is chemically strengthened in a suitable salt bath (with a suitable composition and at a suitable temperature) for a suitable time, the chemically strengthened glass-ceramics thus prepared can have a specific stress distribution structure, and thus achieve the excellent effects as desired in the present application.

[0330] The chemically strengthened glass-ceramics provided in the present application can be used in electronic devices, including but not limited to mobile phones, tablet computers, handheld game consoles, portable digital devices (e.g., digital cameras), vehicle-mounted central control units, electronic whiteboard glasses, smart home devices, smart wearables (e.g., smart wristbands, smart watches, smart glasses), vehicles, aircrafts, or vessels, and any glass devices that require chemically strengthened glass-ceramics. For example, the chemically strengthened glass-ceramics provided in the present application can be used in display screens, cover glasses, touch screens, inner screens, or inner frames of electronic devices; for example, the chemically strengthened glass-ceramics provided in the present application can be used in windshields, such as front windshields or side windshields of vehicles, aircrafts, or vessels; for example, the chemically strengthened glass-ceramics provided in the present application can be used in worktops, other surfaces, appliance doors, floor tiles, wall panels, or storage containers, etc. The other surfaces can include but are not limited to exterior wall surfaces, stair tread surfaces, column facings, or counter surfaces, etc., and the storage containers can include but are not limited to cups, plates, medicine bottles, or beverage bottles, etc.

[0331] For example, the chemically strengthened glass-ceramics provided in the present application can be used to manufacture glass devices. The glass devices can be regular or irregular, and can be manufactured according to the needs of the skilled in the art.

[0332] Exemplarily, the chemically strengthened microcrystalline glass with excellent performance provided by the present application can be used to manufacture cover plate glass, which can be a display screen cover plate, a back cover or a camera protection cover plate of an electronic device. Exemplarily, the chemically strengthened microcrystalline glass with excellent performance provided by the present application can be used in an electronic device. Referring to FIGS. 12, 13, 14 and 15, in the embodiments of the present application, an electronic device, which can be a mobile phone, a tablet computer, a smart wearable device or the like, is provided. The electronic device includes a shell 1 assembled on the outer side of the electronic device, and components such as a circuit board and a battery located inside the shell 1. The shell 1 includes a display screen cover plate 11 assembled on the front side and a back cover 12 assembled on the back side. The display screen cover plate 11 is covered on a display module 4. The display screen cover plate 11 and / or the back cover 12 can be made of the aforementioned chemically strengthened microcrystalline glass. In the embodiments of the present application, the display screen cover plate 11 and the back cover 12 can be made of the aforementioned chemically strengthened microcrystalline glass entirely or partially.

[0333] In some embodiments of the present application, as shown in FIG. 13, the electronic device further includes a camera assembly 2 located inside the shell 1. The shell 1 can include a camera protection cover plate 13, which is covered on the camera assembly 2 for protecting the camera assembly 2. The camera protection cover plate 13 is made of the aforementioned chemically strengthened microcrystalline glass. In the embodiments of the present application, the camera protection cover plate 13 can be made of the aforementioned chemically strengthened microcrystalline glass partially or entirely. In the embodiments of the present application, the camera protection cover plate 13 can be located on the front side of the electronic device or on the back side of the electronic device according to the location of the camera assembly 2. In some embodiments of the present application, the camera protection 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 protection cover plate 13 can be in an integrated structure with the display screen cover plate 11 or the back cover 12.

[0334] In some embodiments of the present application, as shown in FIG. 14, the electronic device further includes a middle frame 3 located between the display module 4 and the shell 1. The middle frame 3 can include the aforementioned chemically strengthened microcrystalline glass.

[0335] In the embodiments of the present application, the display screen cover plate, the back cover, the camera protection cover plate, and the middle frame in the electronic device can be any one of the four using the aforementioned chemically strengthened microcrystalline glass, can be any two of the four using the aforementioned chemically strengthened microcrystalline glass, can be all three of the four using the aforementioned chemically strengthened microcrystalline glass, or can be all four of the four using the aforementioned chemically strengthened microcrystalline glass.

[0336] In some embodiments of the present application, the display screen cover plate, the back cover, the camera protection cover plate, or the middle frame in the electronic device can be 2D, 2.5D, 3D, or special-shaped. In some embodiments of the present application, the display screen cover plate, the back cover, the camera protection cover plate, or the middle frame in the electronic device can be equal-thickness or unequal-thickness.

[0337] The technical solutions of the present application are further described in detail below in combination with embodiments. The embodiments 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.

[0338] Embodiment 1

[0339] I. Preparation of base glass

[0340] 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 clarifying agent sodium chloride (NaCl) was added to the prepared raw materials, and then a V-type mixer was used to mix at a speed of 25r / min for more than 30 minutes to obtain a uniformly mixed raw material mixture.

[0341] The uniformly mixed raw material mixture was transferred to a platinum crucible, and then melted in a platinum-rhodium crucible at 1600°C for more than 5 hours. After that, it was poured into a forming mold for cooling, cooled to about 900°C, and then placed in a 460°C annealing furnace for annealing for 12 hours. After that, it was cooled to room temperature in the furnace, and a base glass brick with a size specification of about 180mm*65mm*24mm was obtained.

[0342] II. Preparation of microcrystalline glass

[0343] The base glass brick was sequentially subjected to nucleation treatment and crystallization treatment, and a transparent microcrystalline glass sample brick was prepared. The composition of the prepared microcrystalline glass was the same as that of the base glass, and was shown in Table 1 in terms of mole percentage of oxides.

[0344] In order to obtain the glass-ceramic product of the embodiment 1 of the present application, the nucleation treatment is performed at a temperature raising rate of 10 ℃ / min to a nucleation temperature of 520 ℃, and the nucleation holding time is 240 min; the crystallization treatment is performed at a temperature raising rate of 10 ℃ / min from the nucleation temperature to a crystallization temperature of 710 ℃, and the crystallization holding time is 60 min, and then the temperature is lowered to room temperature at a temperature lowering rate of 1 ℃ / min, so that the glass-ceramic sample brick is obtained. The nucleation holding time, i.e. the nucleation time, refers to the time for holding the temperature after the crystallization furnace is raised to the set nucleation temperature at the set temperature raising rate. The crystallization holding time, i.e. the crystallization time, refers to the time for holding the temperature after the crystallization furnace is raised to the set crystallization temperature at the set temperature raising rate.

[0345] After the obtained glass-ceramic sample brick is subjected to the cold processing treatment of cutting, CNC processing (the CNC instrument equipment model used in the present application is RCG500S), and polishing in sequence, the glass-ceramic sample satisfying the required specifications and requirements can be prepared.

[0346] In the specific embodiments and comparative examples of the present application, the glass-ceramic sample brick is subjected to the aforementioned cold processing treatment to prepare glass-ceramic polished sheet samples with a length and width of 50 mm x 50 mm and a thickness of 0.47 mm to 0.54 mm. The thickness of the glass-ceramic polished sheet sample prepared in the embodiment 1 is 0.50 mm.

[0347] The glass-ceramic sample obtained in the embodiment 1 is subjected to the following tests:

[0348] The crystalline phase composition, crystallinity, average crystal size (average grain size), dilatometric softening point, density, refractive index, Young's modulus, optical b value, and transmittance (under 550 nm wavelength light) of the glass-ceramic sample are tested, respectively, and the results are shown in Table 2.

[0349] III. Preparation of chemically strengthened glass-ceramic

[0350] The glass-ceramic polished sheet obtained above is subjected to one-step chemical strengthening treatment in a mixed salt at 470 ℃ for a strengthening time of 450 min, and the composition of the mixed salt is 19.99 wt% NaNO3+ 79.98 wt% KNO3+ 0.03 wt% LiNO3.

[0351] After the chemical strengthening treatment, the glass-ceramic sample is taken out and slowly cooled to room temperature on the furnace body of the strengthening furnace, and then the salt on the surface of the glass-ceramic is washed off with clean water. After drying treatment of the glass-ceramic sample, the chemically strengthened glass-ceramic is obtained. The composition of the center or the compressive stress layer of the obtained chemically strengthened glass-ceramic is basically the same as that of the base glass or the glass-ceramic, in terms of the molar percentage of oxides.

[0352] Test conditions of the chemically strengthened microcrystalline glass obtained in Example 1:

[0353] I, stress test: the chemically strengthened microcrystalline glass was measured for CS_50, DOL_0, |CT_CV|, |CT_AV| under SLP-2000 stress tester (the light source wavelength used is 518 nm, SOC = 25.5 (nm / cm) / MPa, the refractive index is set according to the refractive index value of the sample to be measured, and the exposure time is 300 μsec); then the CT_LD value and the values of relationship A (the ratio of the stress integral of the tensile stress layer at a position 2 times DOL_0 from the main surface of the chemically strengthened microcrystalline glass to the half thickness of the chemically strengthened microcrystalline glass to the thickness t) and relationship C (CS_50 / |CT_CV|) were calculated, and the results are shown in Table 3.

[0354] II, the mass content of Na2O and K2O on the surface of the chemically strengthened microcrystalline glass was tested, and the results are shown in Table 4; at the same time, the two main surfaces of the prepared chemically strengthened microcrystalline glass were polished and thinned along the thickness direction, and after each of the two main surfaces was thinned by 3 μm, the thinned chemically strengthened microcrystalline glass was obtained, and the mass percentage of K2O and the mass percentage of Na2O on the surface of the thinned chemically strengthened microcrystalline glass were tested by XRF, and the results are shown in Table 4; then the value of relationship B was calculated, and the results are shown in Table 4.

[0355] III, the average sandpaper drop height resistance, single rod static pressure strength, Vickers hardness and the average size of the longest side of 80% of the fragment particles in the two-dimensional vertical projection after the drop test of the chemically strengthened microcrystalline glass were tested, and the results are shown in Table 4.

[0356] Examples 2-14

[0357] Each of the examples was performed with reference to Example 1, except that the glass composition, glass thickness, different process parameters and the corresponding test results of each example are shown in Tables 1-4.

[0358] The DSC curve of the substrate glass of Example 13 is shown in FIG. 1, and it can be seen from FIG. 1 that the endothermic peak and the exothermic peak of the substrate glass of the present example, from which the appropriate nucleation temperature and crystallization temperature can be selected.

[0359] The XRD pattern of the microcrystalline glass of Example 13 is shown in FIG. 2, and the comparison of the XRD patterns of the microcrystalline glass of Example 13 before and after chemical strengthening is shown in FIG. 3. As can be seen from FIGS. 2 and 3, in the present application, the main crystal phase in the microcrystalline glass used to prepare the chemically strengthened microcrystalline glass and the chemically strengthened microcrystalline glass is lithium disilicate crystal phase, and the crystal phase structure of the microcrystalline glass does not change significantly before and after chemical strengthening.

[0360] The transmittance curve of the glass-ceramics of Example 13 is shown in Figure 4, and the comparison of the transmittance curves of the glass-ceramics of Example 13 before and after chemical strengthening is shown in Figure 5. As can be seen from Figures 4 and 5, the glass-ceramics used to prepare the chemically strengthened glass-ceramics and the chemically strengthened glass-ceramics of the present application are both transparent in the visible light range, have high transmittance, and the transmittance of the glass-ceramics does not change significantly before and after chemical strengthening.

[0361] The stress distribution curve of the chemically strengthened glass-ceramics of Example 13 with thickness is shown in Figure 6. As can be seen from Figure 6, the chemically strengthened glass-ceramics has a good stress distribution.

[0362] The stress distribution curve of the chemically strengthened glass-ceramics of Example 2, Example 3, Comparative Example 4 and Comparative Example 5 with thickness is shown in Figure 7. As can be seen from Figure 7, the chemically strengthened glass-ceramics needs to meet a specific stress distribution to balance good drop performance and good fragment effect after the chemically strengthened glass-ceramics is broken, so as to ensure good safety performance.

[0363] The vertical projection of the fragment particles of the chemically strengthened glass-ceramics of Example 13 and Example 14 in a two-dimensional plane after the glass-ceramics is broken in the drop test is shown in Figures 8 and 9. As can be seen from the figures, the fragments generated after the chemically strengthened glass-ceramics is broken by drop impact are relatively large, and a large number of small fragments that can easily fly around are not formed, which can avoid safety hazards.

[0364] Comparative Examples 1-12

[0365] Each of the comparative examples is prepared according to Example 1, except that the glass composition, thickness, different process parameters and the corresponding test results of each comparative example are shown in Tables 1-4. The vertical projection of the fragment particles of the chemically strengthened glass-ceramics of Comparative Example 6 and Comparative Example 12 in a two-dimensional plane after the glass-ceramics is broken in the drop test is shown in Figures 10 and 11. As can be seen from the figures, the fragments generated after the chemically strengthened glass-ceramics is broken by drop impact are relatively small.

[0366] Dilatometric softening point test: In order to analyze the 3D bending effect of the glass-ceramics of the present application, the thermal expansion coefficient test curves of the glass-ceramics in some examples are tested, and the dilatometric softening points are obtained, which are shown in Table 2. As can be seen from the test results, the dilatometric softening points of the glass-ceramics of the present application are all between 750°C and 820°C, indicating that the glass-ceramics of the present application is beneficial to 3D bending forming to prepare 3D curved glass-ceramics.

[0367] Table 1

[0368] Table 1 (continued) Note: Since Table 1 has more content, a continuation table is used to show the complete content of Table 1. The oxide content of "0%" in Table 1 and Table 1 (Continued) means that the component is not intentionally or deliberately added to the glass composition in the initial batching process, but the component can exist as an impurity. The content in the table is the percentage of oxide in mole, which does not participate in the calculation of the formula. The oxide content in Table 1 can be converted from mole percentage to mass percentage by conversion.

[0369] Table 2

[0370] Table 2 (Continued) Note: Since Table 2 has more content, a continuation table is used to show the complete content of Table 2. " / " in Table 2 and Table 2 (Continued) means that the parameter is not tested or the operation is not performed or the feature is not contained.

[0371] Table 3

[0372] Table 3 (Continued) Note: Since Table 3 has more content, a continuation table is used to show the complete content of Table 3.

[0373] Table 4

[0374] Table 4 (Continued) Note: Since Table 4 has more content, a continuation table is used to show the complete content of Table 4. In Table 4 and Table 4 (Continued), M Na2O , M' K2O are the mass percentages of K2O and Na2O on the surface of the chemically strengthened glass measured by XRF, respectively, and M' Na2O , M' K2O are the mass percentages of K2O and Na2O on the surface of the chemically strengthened glass after polishing and thinning each of the two main surfaces of the chemically strengthened glass by 3 μm in thickness, measured by XRF.

[0375] From the above embodiments and comparative examples of Table 1-Table 4, compared with the comparative examples, by using the embodiment scheme of the present application, by making the difference value relationship between the tensile stress linear density value of the chemical strengthening microcrystalline glass with the main crystalline phase of lithium disilicate crystalline phase and the ratio of the stress integral of the tensile stress layer close to the middle position to the thickness t satisfy a specific difference value, in the case of ensuring that the chemical strengthening microcrystalline glass has a higher overall stress level, the internal stress distribution of the chemical strengthening microcrystalline glass can be ensured to be safer, thereby benefiting the chemical strengthening microcrystalline glass to maintain a safe stress state. When the chemical strengthening microcrystalline glass encounters a drop impact breakage, relatively large fragments are generated, and a large amount of small fragments that are easy to fly around cannot be formed, and safety hazards can be avoided.

[0376] In the schemes of Comparative Example 1-Comparative Example 12, the stress characteristics of the chemical strengthening microcrystalline glass do not satisfy the specific requirements of the present application, such as not satisfying the specific difference value relationship between the tensile stress linear density value and the ratio of the stress integral of the tensile stress layer close to the middle position to the thickness t. Finally, the chemical strengthening microcrystalline glass prepared in the schemes of each comparative example either has poor sandpaper drop height, cannot achieve excellent drop damage resistance, or can withstand lower single rod static pressure intensity, cannot achieve excellent extrusion damage resistance, or has smaller Vickers hardness, or the fragments generated after drop impact breakage are smaller, and high safety performance cannot be achieved.

[0377] For example, in Comparative Example 4-Comparative Example 6, Comparative Example 8-Comparative Example 9, and Comparative Example 12, although a higher compressive stress layer depth and a higher tensile stress linear density are obtained after chemical strengthening treatment, due to the relatively unreasonable stress distribution of the tensile stress layer, the ratio of the tensile stress linear density value to the stress integral of the tensile stress layer close to the middle position to the thickness t cannot reach a specific difference value relationship, and finally, the drop damage resistance and fragment effect of the chemical strengthening microcrystalline glass prepared in these comparative examples are not as good as those of the chemical strengthening microcrystalline glass of the embodiments of the present application. In Comparative Example 1-Comparative Example 3, Comparative Example 10-Comparative Example 11, and Comparative Example 7, due to the relatively unreasonable stress distribution of the tensile stress layer, the ratio of the tensile stress linear density value to the stress integral of the tensile stress layer close to the middle position to the thickness t cannot reach a specific difference value relationship, although the fragments are larger after final breakage, the overall drop damage resistance is not as good as that of the chemical strengthening microcrystalline glass of the embodiments of the present application. For example, in Comparative Example 1-Comparative Example 3, Comparative Example 6, Comparative Example 8-Comparative Example 9, and Comparative Example 12, due to the fact that the stress characteristics and surface component content of the prepared chemical strengthening microcrystalline glass do not satisfy the specific relationship requirements, the single rod static pressure intensity that can be withstood by the chemical strengthening microcrystalline glass prepared in these comparative examples is lower than that of the chemical strengthening microcrystalline glass of the embodiments of the present application.

[0378] For another example, the same glass-ceramics with the same glass composition and crystal phase structure are used in Example 3, Example 12 to 14, Comparative Example 4 and Comparative Example 10 to Comparative Example 12 to prepare the chemically strengthened glass-ceramics, but the chemically strengthened glass-ceramics prepared have different values of the tensile stress linear density and the ratio of the stress integral of the tensile stress layer close to the middle position to the thickness t, and finally it is found that the chemically strengthened glass-ceramics prepared in Example 3 and Example 12 to 14 which meet the requirements of the technical solution range of the present application not only have the sandpaper drop height of more than 1.6 m and excellent drop damage resistance, but also have relatively large fragments after drop impact breaking, and the average size of the longest side of the fragment particles in two-dimensional vertical projection is greater than or equal to 10 mm, and have high safety performance, while the chemically strengthened glass-ceramics prepared in Comparative Example 4 and Comparative Example 12 which do not meet the requirements of the technical solution range of the present application not only have the sandpaper drop height of less than 1.6 m, but also have relatively small fragments after drop impact breaking, and the average size of the longest side of the fragment particles in two-dimensional vertical projection is not more than 5 mm, and at the same time, the chemically strengthened glass-ceramics prepared in Comparative Example 10 and Comparative Example 11 which do not meet the requirements of the technical solution range of the present application have relatively large fragments after drop impact breaking, and the average size of the longest side of the fragment particles in two-dimensional vertical projection is greater than or equal to 10 mm, but the sandpaper drop height is not more than 1.4 m, and the drop damage resistance is obviously poorer than the present application. This shows that for the glass-ceramics with lithium disilicate as the main crystal phase, by making the prepared chemically strengthened glass-ceramics meet specific stress characteristics, the chemically strengthened glass-ceramics have specific stress distribution structure, which not only can improve the mechanical strength performance of the chemically strengthened glass-ceramics and improve the damage resistance thereof, but also can keep the chemically strengthened glass-ceramics in a safe stress state and have high safety performance.

[0379] The above only describes specific embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. 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

[0380] The present application provides a chemically strengthened glass-ceramic, a cover glass, an electronic device and a glass device, and can obtain a chemically strengthened glass-ceramic product with high stress level, and then facilitate the improvement of the stress characteristics on the mechanical strength performance, so that the chemically strengthened glass-ceramic meets excellent damage resistance and high safety performance.

Claims

1. A chemically strengthened microcrystalline glass characterized in that, The chemical strengthening microcrystalline glass comprises lithium disilicate crystal phase, wherein the lithium disilicate crystal phase has a higher mass percentage than other crystal phases present in the chemical strengthening microcrystalline glass; The surface of the chemical strengthening microcrystalline glass has a compressive stress layer and has a tensile stress layer inside; The chemical strengthening microcrystalline glass satisfies the following relationship: A≥49500, preferably A≥50000, more preferably A≥51000, and more preferably the value of A is 49500-65000; CT_LD is the tensile stress linear density, with a unit of MPa / mm, CT_LD≥60000 MPa / mm, t is the thickness of the chemical strengthening microcrystalline glass, with a unit of mm, is the ratio of the stress integral of the tensile stress layer from the position of 2 times DOL_0 to the position of half of the thickness of the chemical strengthening microcrystalline glass to the thickness t along the thickness direction of the chemical strengthening microcrystalline glass, with a unit of MPa / mm, wherein x is the depth from the main surface of the chemical strengthening microcrystalline glass.

2. The chemically strengthened glass ceramic according to claim 1, wherein The chemical strengthening microcrystalline glass satisfies the following relationship: B = [ | CT AV | x (t / 2 - DOL 0 ) ] x [5 x M K2O + 0.5 x M K2O + 0.5 x M Na2O ], B > 9000 MPa-μm, preferably B > 9100 MPa-μm, more preferably B > 9200 MPa-μm, more preferably B has a value of 9000 MPa-μm to 13000 MPa-μm; |CT_AV| is the absolute value of the average tensile stress, t is the thickness of the chemical strengthening microcrystalline glass, M K2O K2O is the mass percentage of K2O on the surface of the chemically strengthened microcrystalline glass, M Na2O The mass percentage of Na2O on the surface of the chemically strengthened microcrystalline glass.

3. The chemically strengthened glass-ceramics according to claim 1 or 2, characterized in that, The chemical strengthening microcrystalline glass satisfies the following relationship: C=CS_50 / |CT_CV|, C≥0.85, preferably 0.85-1.5, more preferably 0.9-1.3, and more preferably 0.9-1.2; wherein CS_50 refers to the compressive stress value at a depth of 50 μm from the main surface of the chemical strengthening microcrystalline glass, with a unit of MPa, and |CT_CV| is the absolute value of the maximum tensile stress, with a unit of MPa.

4. The chemically strengthened glass ceramic according to any one of claims 1 to 3, wherein, The chemical strengthening microcrystalline glass satisfies: 140.00 MPa≤CS_50, preferably 180.00 MPa≤CS_50, and more preferably 180.00 MPa≤CS_50≤240.00 MPa, wherein CS_50 refers to the compressive stress value at a depth of 50 μm from the main surface of the chemical strengthening microcrystalline glass; and / or, 90.00 μm≤DOL_0, preferably 100.00 μm≤DOL_0, and more preferably 100.00 μm≤DOL_0≤160.00 μm, wherein DOL_0 is the depth of the compressive stress layer; and / or, 0.18≤DOL_0 / t, preferably 0.20≤DOL_0 / t≤0.25, and more preferably 0.22≤DOL_0 / t≤0.23, wherein DOL_0 is the depth of the compressive stress layer, and t is the thickness of the chemical strengthening microcrystalline glass; and / or, 150 MPa≤|CT_CV|, preferably 150 MPa≤|CT_CV|≤250 MPa, and more preferably 180 MPa≤|CT_CV|≤250 MPa, wherein |CT_CV| is the absolute value of the maximum tensile stress; and / or, 100.00 MPa≤ |CT_AV|, preferably 100.00 MPa≤ |CT_AV|≤ 160.00 MPa, more preferably 130.00 MPa≤ |CT_AV|≤ 160.00 MPa, wherein |CT_AV| is the absolute value of the average tensile stress; and / or, 65000.00 MPa / mm≤ CT_LD≤ 90000.00 MPa / mm, more preferably 70000.00 MPa / mm≤ CT_LD≤ 90000.00 MPa / mm, wherein CT_LD refers to the tensile stress line density; and / or, M K2O ≤ 3.0%, preferably 0.2% to 2%, more preferably 0.3% to 1.6%, wherein M K2O is the mass percentage of K2O on the surface of the chemically strengthened glass ceramic; and / or, M Na2O ≥5.0%, preferably 5.0% to 20%, more preferably 6% to 17%, wherein M Na2O is the mass percentage of Na2O on the surface of the chemically strengthened glass ceramic.

5. The chemically strengthened glass ceramic according to any one of claims 1 to 4, wherein After the two main surfaces of the chemically strengthened microcrystalline glass are each thinned by 3 μm in thickness, the obtained chemically microcrystalline glass satisfies: the mass percentage M' of K2O on the surface of the chemically microcrystalline glass K2O and the mass percentage M' of Na2O on the surface of the chemically microcrystalline glass Na2O is: M' K2O <3.0%, preferably 0.0% to 1%, more preferably 0.1% to 0.5%, M' Na2O <15.0%, preferably 3.0% to 14%, more preferably 4% to 12%.

6. The chemically strengthened glass ceramic according to any one of claims 1 to 5, wherein, the composition of the chemically strengthened glass-ceramics at the center or the tensile stress layer comprises, in mole percent on the basis of oxides: SiO2: 58% to 66%, Al2O3: 0% to 3.5%, P2O5: 1% to 2.5%, ZrO2: 3.5% to 5.5%, Li2O: 22% to 32%, SrO: 0% to 2.5%, Na2O: 0% to 3%.

7. The chemically strengthened glass ceramic according to claim 6, wherein the composition of the chemically strengthened glass-ceramics at the center or the tensile stress layer further comprises, in mole percent on the basis of oxides: K2O: 0% to 1%, CaO: 0% to 1.5%, B2O3: 0% to 1%, Ta2O5: 0% to 1%, BaO: 0% to 2.5%.

8. The chemically strengthened glass-ceramic according to claim 6 or 7, characterized in that, the composition of the chemically strengthened glass-ceramics at the center or the tensile stress layer comprises, in mole percent on the basis of oxides: the mole percent of SiO2 is 60% to 65%, preferably 60.5% to 64.5%; and / or, the mole percent of Al2O3 is 1% to 3.5%, preferably 1% to 2.5%, more preferably 1% to 1.5%; and / or, the mole percent of P2O5 is 1% to 2%, preferably 1.2% to 2%; and / or, the mole percent of ZrO2 is 4% to 5%, preferably 4.2% to 5%; and / or, the mole percent of Li2O is 23% to 31%, preferably 24% to 30%, more preferably 27% to 30%; and / or, the mole percent of SrO is 0% to 2%, preferably 0% to 1.9%; and / or, the mole percent of Na2O is 0% to 2.6%, preferably 0% to 1%; and / or, the mole percent of K2O is 0% to 0.7%, preferably 0% to 0.5%; and / or, the mole percent of CaO is 0% to 1%, preferably 0% to 0.95%; and / or, the mole percent of B2O3 is 0% to 0.7%, preferably 0% to 0.5%; and / or, the mole percent of Ta2O5 is 0% to 0.7%, preferably 0% to 0.5%; and / or, the mole percent of BaO is 0% to 2%, preferably 0% to 1.9%.

9. The chemically strengthened glass ceramic according to any one of claims 1 to 8, wherein, the chemically strengthened glass-ceramics satisfies: 2.00≤n(SiO2) / n(Li2O)≤2.40, preferably 2.00≤n(SiO2) / n(Li2O)≤2.30, more preferably 2.02≤n(SiO2) / n(Li2O)≤2.20; and / or, 90%≤n(SiO2)+n(Li2O)≤95%, preferably 90%≤n(SiO2)+n(Li2O)≤92%; wherein n(SiO2) is the molar percentage content of SiO2 at the center of the chemically strengthened glass-ceramic or in the tensile stress layer, and n(Li2O) is the molar percentage content of Li2O at the center of the chemically strengthened glass-ceramic or in the tensile stress layer.

10. The chemically strengthened glass ceramic according to any one of claims 1 to 5, wherein, The composition of the center of the chemically strengthened glass-ceramic or the tensile stress layer comprises, in mass percentage of oxides: SiO2: 60% to 70%, Al2O3: 0% to 6%, P2O5: 2% to 8%, ZrO2: 8% to 12%, Li2O: 10% to 20%, SrO: 0% to 6%, Na2O: 0% to 3%.

11. The chemically strengthened glass ceramic according to claim 10, wherein The composition of the center of the chemically strengthened glass-ceramic or the tensile stress layer further comprises, in mass percentage of oxides: K2O: 0% to 2%, CaO: 0% to 2%, B2O3: 0% to 1%, Ta2O5: 0% to 2%, BaO: 0% to 6%.

12. The chemically strengthened glass-ceramic according to claim 10 or 11, characterized in that, The composition of the center of the chemically strengthened glass-ceramic or the tensile stress layer comprises, in mass percentage of oxides: The mass percentage of SiO2 is 62% to 68%, preferably 63% to 67%; and / or, The mass percentage of Al2O3 is 1% to 6%, preferably 2% to 6%, more preferably 2% to 3%; and / or, The mass percentage of P2O5 is 3% to 6%, preferably 3% to 5%, more preferably 4% to 5%; and / or, The mass percentage of ZrO2 is 8% to 11%, preferably 9% to 11%; and / or, The mass percentage of Li2O is 11% to 18%, preferably 12% to 16%, more preferably 14% to 16%; and / or, The mass percentage of SrO is 0% to 5%, preferably 0% to 4%; and / or, The mass percentage of Na2O is 0% to 2.8%, preferably 0% to 1%; and / or, The mass percentage of K2O is 0% to 1.5%, preferably 0% to 1.2%; and / or, The mass percentage of CaO is 0% to 1%, preferably 0% to 0.95%; and / or, The mass percentage of B2O3 is 0% to 0.8%, preferably 0% to 0.6%; and / or, The mass percentage of Ta2O5 is 0% to 1.8%, preferably 0% to 1.5%; and / or, The mass percentage of BaO is 0% to 5.5%, preferably 0% to 5%.

13. The chemically strengthened glass ceramic of any one of claims 1 to 12, wherein, The crystallinity of the chemically strengthened glass-ceramic is not less than 60%, preferably the crystallinity of the chemically strengthened glass-ceramic is 70% to 90%, more preferably the crystallinity of the chemically strengthened glass-ceramic is 70% to 80%; and / or, The average grain size of the chemically strengthened glass-ceramics is not more than 50 nm, preferably, the average grain size is 10 nm to 40 nm, more preferably, the average grain size is 15 nm to 30 nm; and / or, The mass percentage of lithium disilicate crystal phase in the chemically strengthened glass-ceramics is 80 wt% to 100 wt% of all crystal phases; and / or, The mass percentage of petalite crystal phase in the chemically strengthened glass-ceramics is less than or equal to 10%, preferably less than or equal to 5%, more preferably, the chemically strengthened glass-ceramics does not contain petalite crystal phase.

14. The chemically strengthened glass ceramic of any one of claims 1 to 13, wherein, The b value of the chemically strengthened glass-ceramics is less than 1.0, preferably, the b value is less than 0.8, more preferably, the b value is less than or equal to 0.6, when the thickness is not more than 0.70 mm; and / or, The chemically strengthened glass-ceramics is transparent in the visible light wavelength range, preferably, the transmittance of the chemically strengthened glass-ceramics is greater than or equal to 85% for 550 nm wavelength light, preferably, the transmittance is greater than or equal to 90%, more preferably, the transmittance is greater than or equal to 90.2%.

15. The chemically strengthened glass ceramic of any one of claims 1 to 14, wherein, The Young's modulus of the chemically strengthened glass-ceramics is not less than 100 GPa, preferably, the Young's modulus is not less than 110 GPa, more preferably, the Young's modulus is 110 GPa to 130 GPa; and / or, The density of the chemical strengthening microcrystalline glass is not less than 2.54 g / cm 3 , preferably, the density is 2.54 g / cm 3 ~ 2.64 g / cm 3 ; and / or, The refractive index of the chemically strengthened glass-ceramics is less than or equal to 1.60, preferably, the refractive index is 1.55 to 1.60; and / or, The Vickers hardness of the chemically strengthened glass-ceramics is ≥ 700 kgf / mm 2 , preferably, the Vickers hardness is 700 kgf / mm 2 ~ 850 kgf / mm 2 .

16. The chemically strengthened glass ceramic of any one of claims 1 to 15, wherein, The thickness t of the chemically strengthened glass-ceramics is 0.35 mm to 1.0 mm, preferably, the thickness t is 0.4 mm to 0.7 mm, more preferably, the thickness t is 0.45 mm to 0.55 mm; and / or, the chemically strengthened glass-ceramics is 2D, 2.5D, 3D or special-shaped; and / or, the chemically strengthened glass-ceramics is equal-thickness or non-equal-thickness.

17. The chemically strengthened glass ceramic of any one of claims 1 to 16, wherein, The chemically strengthened glass-ceramics is subjected to sandpaper drop test, using 80 mesh sandpaper, when the thickness is not more than 0.70 mm, preferably, the thickness is 0.4 mm to 0.7 mm, more preferably, the thickness is 0.45 mm to 0.55 mm, the average sandpaper drop height of the chemically strengthened glass-ceramics is greater than or equal to 1.60 m, preferably, the average sandpaper drop height of the chemically strengthened glass-ceramics is 1.65 m to 2.50 m; and / or, The chemically strengthened glass-ceramics is subjected to single-rod static pressure test using a 10 mm diameter round head metal pressure rod, the average single-rod static pressure strength of the chemically strengthened glass-ceramics is greater than 200 N, preferably, the average single-rod static pressure strength is greater than 230 N.

18. The chemically strengthened glass ceramic of claim 3, wherein, The chemically strengthened glass-ceramics satisfies: The value of the relationship A is 54802.89, 51024.81, 57170.35, 52689.22, 52272.54, 58526.63, 54807.04, 56429.32, 52815.28, 53580.63, 54032.42, 54060.10, 53361.40 or 54841.31; and / or, The value of the relationship A is 54802.89, 51024.81, 57170.35, 52689.22, 52272.54, 58526.63, 54807.04, 56429.32, 52815.28, 53580.63, 54032.42, 54060.10, 53361.40 or 54841.31; and / or, The value of relationship B is 10333.74 MPa pm, 11642.77 MPa pm, 11864.03 MPa pm, 10818.69 MPa pm, 10199.45 MPa pm, 10638.55 MPa pm, 10862.45 MPa pm, 9442.20 MPa pm, 9292.34 MPa pm, 10157.90 MPa pm, 10637.99 MPa pm, 10907.18 MPa pm, 10429.05 MPa pm, or 11586.62 MPa pm; and / or, The value of relationship C is 0.93, 1.12, 1.00, 0.97, 1.03, 0.99, 1.01, 0.98, 0.92, 1.05, or 1.

06.

19. A cover glass, characterized by The cover glass comprises the chemically strengthened glass ceramic of any one of claims 1-18.

20. An electronic device, comprising: The electronic device comprises the chemically strengthened glass ceramic of any one of claims 1-18.

21. The electronic device of claim 20, wherein, The electronic device comprises a housing assembled on the outside of the electronic device, the housing comprising the chemically strengthened glass ceramic of any one of claims 1-18.

22. The electronic device of claim 21, wherein, The housing comprises a display cover glass assembled on the front side of the electronic device, the display cover glass comprising the chemically strengthened glass ceramic of any one of claims 1-18.

23. The electronic device of claim 21 or 22, wherein, The housing comprises a back cover assembled on the back side of the electronic device, the back cover comprising the chemically strengthened glass ceramic of any one of claims 1-18.

24. The electronic device of any of claims 21-23, wherein, The electronic device further comprises a camera assembly located inside the housing, the housing comprising a camera protection cover glass covering the camera assembly, the camera protection cover glass comprising the chemically strengthened glass ceramic of any one of claims 1-18.

25. The electronic device of any of claims 21-24, wherein, The electronic device further comprises a middle frame, the middle frame comprising the chemically strengthened glass ceramic of any one of claims 1-18.

26. A glass article, characterized by, The glass device comprises the chemically strengthened glass ceramic of any one of claims 1-18.

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