A lithium aluminosilicate glass and a method of making the same

Abstract

This invention relates to the field of glass manufacturing technology, and more particularly to a lithium aluminum silicon glass and its preparation method. The glass comprises the following raw material components by mass percentage of oxides: 49–67 wt% SiO2, 12–27 wt% Al2O3, 0–3.5 wt% B2O3, 2–5.5 wt% Li2O, 0.5–13.5 wt% Na2O, 0–3.5 wt% K2O, 0–4.5 wt% MgO, 0–3.5 wt% ZnO, 0–2 wt% CaO, 0–2 wt% SrO, 1.5–14 wt% P2O5, 0–1 wt% ZrO2, 0–9 wt% Y2O3, and 0–0.5 wt% SnO; RO is the sum of the mass percentages of MgO, ZnO, CaO, and SrO in the glass composition, and RO is 0–4.5%. By adjusting the composition of lithium aluminum silicon glass to promote ion exchange, a thicker composite compressive stress layer is formed on the glass surface, thereby improving the glass's strength, surface compressive stress, bending resistance, and drop resistance. This solves the problem of low mechanical strength and drop resistance in existing lithium aluminum silicon glass technologies, which fails to meet consumers' requirements for the damage resistance of displays.

Description

Technical Field

[0001] This invention relates to the field of glass manufacturing technology, specifically to a lithium aluminum silicon glass and its preparation method. Background Technology

[0002] With the advancements in new display technologies—namely, their thinner and lighter designs, diversified application scenarios, large-screen smart touch displays, and the development of 5G—consumers are placing higher demands on the durability of displays, such as impact resistance, drop resistance, and scratch resistance. Currently, high-strength glass systems mainly include soda-lime silicate glass, high-alumina glass, and lithium aluminum silicate glass. Compared to traditional soda-lime silicate and high-alumina glass, lithium aluminum silicate glass possesses a denser network structure, higher elastic modulus, and suitability for two-step chemical tempering, making it a highly regarded third-generation high-strength glass substrate in recent years. Given the unique effects of Li2O on glass structure and properties, aluminosilicate glasses containing Li2O are typically referred to as lithium aluminum silicate glass. The functions of Li2O in aluminosilicate glass are primarily twofold: firstly, to provide small-radius LiO for two-step chemical tempering reinforcement. + To achieve simultaneous improvement in surface compressive stress (CS) and depth of stress layer (DOL), ensuring the glass possesses excellent mechanical properties; secondly, to reduce the high-temperature viscosity of the glass, promoting the full melting of high-content Al2O3. Lithium-aluminum-silicon glass is generally produced using the float glass or overflow method to create large-size glass sheets of varying thicknesses. Then, through ion exchange enhancement, it achieves high strength, high hardness, and drop resistance, and is widely used as cover plates in the electronics and information field, transparent devices in the aerospace field, and observation windows for ships and special vehicles.

[0003] Although existing lithium aluminum silicon glass has better mechanical strength and drop resistance than traditional glass, it still cannot meet the growing consumer demand for protection against damage. Summary of the Invention

[0004] To address the problem that existing lithium aluminum silicon glass has low mechanical strength and drop resistance, failing to meet consumers' requirements for the damage resistance of displays, this invention provides a lithium aluminum silicon glass and its preparation method.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] This invention provides a lithium aluminum silicon glass, comprising the following raw material components by mass percentage of oxides:

[0007] The glass composition consists of 49–67 wt% SiO2, 12–27 wt% Al2O3, 0–3.5 wt% B2O3, 2–5.5 wt% Li2O, 0.5–13.5 wt% Na2O, 0–3.5 wt% K2O, 0–4.5 wt% MgO, 0–3.5 wt% ZnO, 0–2 wt% CaO, 0–2 wt% SrO, 1.5–14 wt% P2O5, 0–1 wt% ZrO2, 0–9 wt% Y2O3, and 0–0.5 wt% SnO; RO is the sum of the mass percentages of MgO, ZnO, CaO, and SrO in the glass composition, with RO ranging from 0 to 4.5%.

[0008] Furthermore, its surface compressive stress CS≥800MPa, and its directional drop height on 180-grit sandpaper ≥800mm.

[0009] Furthermore, its compressive stress layer DOL≥100μm, 0.15≤DOL / t≤0.25, where t is the thickness of the lithium aluminum silicon glass.

[0010] A method for preparing lithium aluminum silicon glass, comprising:

[0011] The following ingredients are mixed according to their mass percentages: 49–67 wt% SiO2, 12–27 wt% Al2O3, 0–3.5 wt% B2O3, 2–5.5 wt% Li2O, 0.5–13.5 wt% Na2O, 0–3.5 wt% K2O, 0–4.5 wt% MgO, 0–3.5 wt% ZnO, 0–2 wt% CaO, 0–2 wt% SrO, 1.5–14 wt% P2O5, 0–1 wt% ZrO2, 0–9 wt% Y2O3, and 0–0.5 wt% SnO. The mixture is then melted, clarified, homogenized, shaped, and annealed to obtain a glass sample. RO is the sum of the mass percentages of MgO, ZnO, CaO, and SrO in the glass composition, and RO is 0–4.5%.

[0012] The glass sample is cut and polished to obtain glass products;

[0013] The glass product is first strengthened in the first mixed molten salt;

[0014] The glass product after the first strengthening is subjected to a second strengthening in the second mixed molten salt to complete the preparation of lithium aluminum silicon glass;

[0015] Wherein, both the first mixed molten salt and the second mixed molten salt are mixed molten salts of NaNO3 and KNO3.

[0016] Furthermore, in the first mixed molten salt, NaNO3 accounts for 36–100 wt%, with the remainder being KNO3.

[0017] Furthermore, in the second mixed molten salt, KNO3 is 95-100 wt%, and the remainder is NaNO3.

[0018] Furthermore, the temperature for the first strengthening is 380℃~470℃, and the time is 90~360min.

[0019] Furthermore, the temperature for the second strengthening is 380℃~460℃, and the time is 15~180min.

[0020] Furthermore, the thickness of the glass article is ≥0.4mm and ≤2mm.

[0021] A lithium aluminum silicon glass is prepared using the method described above.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention discloses a lithium aluminum silicon glass, comprising the following raw material components by mass percentage of oxides:

[0024] The glass composition comprises 49–67 wt% SiO2, 12–27 wt% Al2O3, 0–3.5 wt% B2O3, 2–5.5 wt% Li2O, 0.5–13.5 wt% Na2O, 0–3.5 wt% K2O, 0–4.5 wt% MgO, 0–3.5 wt% ZnO, 0–2 wt% CaO, 0–2 wt% SrO, 1.5–14 wt% P2O5, 0–1 wt% ZrO2, 0–9 wt% Y2O3, and 0–0.5 wt% SnO; wherein RO is the sum of the mass percentages of MgO, ZnO, CaO, and SrO in the glass composition, and RO is 0–4.5%. SiO2, a network-forming oxide, is the main component forming the glass. Its basic structural unit is the silicon-oxygen tetrahedron [SiO4], connected at their vertices, forming the main network structure of the glass and imparting a certain intrinsic strength. A higher SiO2 content leads to a higher degree of network connectivity, increasing the glass viscosity and making melting more difficult. Simultaneously, a higher proportion of the silicon-oxygen framework results in smaller network gaps, which is detrimental to ion exchange during chemical strengthening, affecting the efficiency of chemical strengthening. Therefore, the SiO2 content in this invention needs to be controlled within the range of 49–67 wt%. Al2O3 is an intermediate in the glass network; when the content of alkali metals and alkaline earth metals in the glass is high, Al… 3+Al2O3 tends to form glassy aluminum-oxygen tetrahedra [AlO4], replacing some [SiO4] to jointly form a network structure, participating in network composition and improving the intrinsic strength of the glass. Furthermore, the volume of [AlO4] is greater than that of [SiO4], so a higher Al2O3 content is beneficial for ion exchange. However, excessively high Al2O3 content significantly increases the high-temperature viscosity of the glass, making it difficult to melt. On the other hand, as aluminum is one of the main components of lithium aluminum silicon glass, an increase in its content also increases the tendency for crystallization. Therefore, the Al2O3 content in this invention needs to be controlled within the range of 12–27 wt%. Li2O, as a flux, can significantly reduce high-temperature viscosity at high temperatures, improving the meltability and formability of the glass. It is also an important component of lithium aluminum silicon double-strength glass and one of the ion exchange components. A higher Li2O content not only increases the cost of glass manufacturing and significantly increases the coefficient of thermal expansion, but also... + The accumulation of Na₂O increases the tendency for glass crystallization, making the glass prone to devitrification. Therefore, the Li₂O content in this invention needs to be controlled within the range of 2–5.5 wt%. Na₂O is an oxide on the glass network and can provide "free oxygen" to disrupt the glass network structure, thereby reducing the viscosity and melting temperature of lithium aluminosilicate glass. Furthermore, Na₂O is an important element for ion exchange in chemical strengthening. Excessive Na₂O content increases the coefficient of thermal expansion, reduces chemical stability, and its volatility leads to uneven glass composition. Insufficient Na₂O content is detrimental to glass melting and forming, as well as the absorption of Na₂O. + With K + Ion exchange cannot achieve the purpose of enhancing the mechanical strength of glass. Considering all factors, the Na₂O content in this invention needs to be controlled within the range of 0.5–13.5 wt%. K₂O and Na₂O both belong to alkali metal oxides and have similar roles in the glass structure. Furthermore, there is a "mixed alkali effect" between K₂O and Na₂O, which has a certain effect on improving a series of glass properties. K₂O also has a certain effect on lowering the glass liquidus temperature. Therefore, the K₂O content in this invention ranges from 0–3.5 wt%. B₂O₃ belongs to the glass network forging body. During high-temperature melting, it exists as trigonal [BO₃], reducing the high-temperature viscosity of the glass. At low temperatures, it can capture free oxygen to form tetrahedral [BO₄], making the structure more compact, improving the chemical and thermal stability of the glass, and increasing its mechanical strength. When the amount of B₂O₃ introduced is too high, the Young's modulus and acid resistance of the glass decrease. In addition, B₂O₃ can form a dense network structure, affecting ion migration, thereby significantly reducing the ion exchange capacity of the glass. Therefore, the B2O3 content in this invention needs to be controlled within the range of 0–3.5 wt%. MgO is an oxide in the glass network and helps to improve glass meltability, reduce high-temperature viscosity, and promote glass melting and refining. However, because its ionic radius is close to that of alkali metal ions and it has a larger charge, Mg...2+ The ionic potential energy of Mg is also large, therefore, in the process of chemical strengthening, Mg 2+ It hinders the ion exchange between Li-Na and Na-K. Therefore, the MgO content in this invention needs to be controlled within the range of 0–4.5 wt%. ZnO has a similar effect to MgO, also significantly hindering ion exchange during chemical strengthening. Therefore, the ZnO content in this invention needs to be controlled within the range of 0–3.5 wt%. CaO, as a network exooxide, can improve the chemical stability of glass, reduce high-temperature viscosity, improve ion exchange capacity, and increase the Young's modulus of glass. However, excessive CaO content will lead to a shortened glass thickness and increased brittleness. Therefore, the CaO content in this invention needs to be controlled within the range of 0–2 wt%. SrO, being a network exooxide, improves the chemical stability of glass, accelerates glass melting, and lowers the liquidus temperature. Introducing an appropriate amount of SrO into glass will improve its mechanical properties, such as hardness and shatter resistance. However, excessive SrO content will worsen the clarification effect and increase the glass density. Therefore, the SrO content in this invention needs to be controlled within the range of 0–2 wt%. Y₂O₃ is a rare earth metal oxide and an intermediate oxide. The introduction of an appropriate amount of Y₂O₃ can improve the toughness of glass and increase its Young's modulus and hardness. However, the introduction of Y₂O₃ increases the crystallization tendency of the lithium aluminum silicon glass system and reduces the manufacturability of the glass. In this invention, the Y₂O₃ content needs to be controlled within the range of 0–9 wt%, more preferably 0–3 wt%. ZrO₂ can improve the fracture toughness of glass, but if the content is too high, it will increase the crystallization tendency of the glass. Therefore, in this invention, the ZrO₂ content needs to be controlled within the range of 0–1 wt%. P₂O₅ is a glass network-forming oxide, with [PO₄] tetrahedra interconnected in a layered structure, which is beneficial for ion exchange in chemical strengthening and also provides damage resistance. However, a higher content of P₂O₅ is detrimental to the chemical stability of the glass surface and increases the tendency for glass devitrification. Considering all factors, in this invention, the P₂O₅ content needs to be controlled within the range of 1.5–14 wt%. In addition to the above oxides, the glass of this invention contains a chemical clarifying agent, wherein the SnO concentration is controlled at approximately 0–0.5 wt%. This invention achieves superior comprehensive performance of lithium aluminum silicon glass through specific combinations of its components. This enhances the chemical strengthening effect of the glass while providing better protection for smart terminal products as a glass cover. RO represents the sum of the mass percentages of MgO, ZnO, CaO, and SrO in the glass composition, satisfying a MgO+ZnO+CaO+SrO ratio of 0–4.5%. By optimizing the composition of the lithium aluminum silicon glass, during chemical strengthening, while ensuring the glass's stability and other properties remain unaffected, the composition is adjusted to promote ion exchange, forming a thicker composite compressive stress layer on the glass surface. This improves the glass's strength, surface compressive stress, bending resistance, and drop resistance.

[0025] This invention also provides a method for preparing lithium aluminum silicon glass. The method involves mixing, melting, clarifying, homogenizing, shaping, annealing, cutting, and polishing raw materials to obtain a glass product. Then, the glass product is subjected to two consecutive strengthening processes in a first mixed molten salt to complete the preparation of the lithium aluminum silicon glass. This invention uses a mixed molten salt of NaNO3 and KNO3 for two-step chemical strengthening of the lithium aluminum silicon glass. It utilizes the ion exchange between small ions in the glass and large ions in the salt bath to generate compressive stress (CS) and a compressive stress layer (DOL) on the glass surface. That is, the Li in the glass... + and Na + With Na in the salt bath + and K + Li-Na, Na-K, and a small amount of Li-K exchange are performed to form a compressive stress layer on the glass surface, thereby increasing the mechanical strength and impact resistance of the glass. Traditional single-step chemical strengthening methods can achieve high CS (compressive stress layer), but the DOL (displacement oscillation layer) is shallow, resulting in poor impact resistance. Extending the ion exchange time can increase DOL, but simultaneously causes a rapid decrease in CS due to stress relaxation, making it difficult to achieve the ideal value. This invention employs a two-step chemical strengthening method that increases the DOL value on the glass surface while keeping the maximum CS value near the glass surface, significantly improving the glass's impact and drop resistance. The first chemical strengthening step involves exchanging Na in the molten salt... + (r=0.098nm) and Li in the glass + (r=0.078nm) exchange is performed to obtain extremely deep DOL; second strengthening, K in molten salt + (r = 0.133 nm) Na that entered the glass during the first chemical strengthening process + The exchange yields a higher CS (chromatic surface area), thereby further improving the mechanical properties and drop resistance of lithium aluminum silicon glass.

[0026] The present invention also provides a lithium aluminum silicon glass prepared by the above preparation method. This glass has a larger surface compressive stress and a deeper compressive stress layer, thus possessing superior mechanical properties and drop resistance. According to the test, this glass can withstand a directional drop of up to 1500mm on 180-grit sandpaper. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a method for preparing lithium aluminum silicon glass according to the present invention. Detailed Implementation

[0028] To enable those skilled in the art to understand the features and effects of the present invention, the terms and expressions used in the specification and claims are explained and defined in general below. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning understood by those skilled in the art regarding the present invention, and in case of conflict, the definitions in this specification shall prevail.

[0029] The theories or mechanisms described and disclosed herein, whether right or wrong, should not in any way limit the scope of the invention, that is, the contents of the invention can be implemented without being limited by any particular theory or mechanism.

[0030] In this document, all features defined by numerical ranges or percentage ranges, such as numerical values, quantities, contents, and concentrations, are for the sake of brevity and convenience only. Accordingly, descriptions of numerical ranges or percentage ranges should be considered as covering and specifically disclosing all possible sub-ranges and individual numerical values ​​(including integers and fractions) within those ranges.

[0031] In this article, unless otherwise specified, “contains,” “includes,” “containing,” “has,” or similar terms cover the meanings of “composed of” and “mainly composed of,” for example, “A contains a” covers the meanings of “A contains a and others” and “A contains only a.”

[0032] For the sake of brevity, not all possible combinations of the technical features in each implementation scheme or embodiment are described herein. Therefore, as long as there is no contradiction in the combination of these technical features, the technical features in each implementation scheme or embodiment can be combined arbitrarily, and all possible combinations should be considered within the scope of this specification.

[0033] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0034] The following examples use instruments and equipment conventional in the art. Experimental methods in the following examples, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer. All raw materials used in the following examples are conventional commercially available products with specifications conventional in the art. In this specification and the following examples, unless otherwise specified, "%" refers to weight percentage, "parts" refers to parts by weight, and "ratio" refers to weight proportion.

[0035] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0036] This invention discloses a chemical strengthening method for lithium aluminum silicon glass, comprising the following raw material components by mass percentage of oxides:

[0037] The glass composition comprises 49–67 wt% SiO2, 12–27 wt% Al2O3, 0–3.5 wt% B2O3, 2–5.5 wt% Li2O, 0.5–13.5 wt% Na2O, 0–3.5 wt% K2O, 0–4.5 wt% MgO, 0–3.5 wt% ZnO, 0–2 wt% CaO, 0–2 wt% SrO, 1.5–14 wt% P2O5, 0–1 wt% ZrO2, 0–9 wt% Y2O3, and 0–0.5 wt% SnO; wherein RO is the sum of the mass percentages of MgO, ZnO, CaO, and SrO in the glass composition, and RO is 0–4.5%.

[0038] The surface compressive stress CS is ≥ 800 MPa, the compressive stress layer DOL is ≥ 100 μm, and 0.15 ≤ DOL / t ≤ 0.25, where t is the thickness of the lithium aluminum silicon glass.

[0039] See Figure 1 This invention provides a method for preparing lithium aluminum silicon glass, comprising:

[0040] S1: Mix 49–67 wt% SiO2, 12–27 wt% Al2O3, 0–3.5 wt% B2O3, 2–5.5 wt% Li2O, 0.5–13.5 wt% Na2O, 0–3.5 wt% K2O, 0–4.5 wt% MgO, 0–3.5 wt% ZnO, 0–2 wt% CaO, 0–2 wt% SrO, 1.5–14 wt% P2O5, 0–1 wt% ZrO2, 0–9 wt% Y2O3 and 0–0.5 wt% SnO according to the mass percentage of oxides, melt, clarify, homogenize, shape, anneal, and obtain a glass sample.

[0041] S2: Cut and polish the glass sample to obtain a glass product; the thickness of the glass product is ≥0.4mm and ≤2mm;

[0042] S3: The glass product is subjected to a first strengthening process in a first mixed molten salt; the temperature of the first strengthening process is 380℃~470℃, and the time is 90~360min;

[0043] S4: The glass product after the first strengthening is subjected to a second strengthening in the second mixed molten salt to complete the preparation of lithium aluminum silicon glass; the temperature of the second strengthening is 380℃~460℃ and the time is 15~180min;

[0044] Wherein, both the first mixed molten salt and the second mixed molten salt are mixed molten salts of NaNO3 and KNO3; in the first mixed molten salt, NaNO3 is 36-100 wt%, and the remainder is KNO3; in the second mixed molten salt, KNO3 is 95-100 wt%, and the remainder is NaNO3.

[0045] To further verify the beneficial effects of the present invention, 36 embodiments are provided, and the lithium aluminum silicon glass prepared in these 36 embodiments is further verified. The strengthened glass products prepared in these 36 embodiments are subjected to sandpaper drop tests sequentially using a simulated whole-machine drop tester. A 180g steel plate and 180-grit sandpaper are used for directional drops from an initial height of 400mm. If the sample does not break, the drop height is increased by 100mm each time for a limit test. The component content and corresponding test results of each embodiment are shown in the table below:

[0046]

[0047]

[0048]

[0049]

[0050]

[0051]

[0052]

[0053]

[0054] It is evident that the lithium aluminum silicon glass prepared by this method, after secondary strengthening, exhibits a compressive stress CS≥800MPa on its surface, a compressive stress layer DOL≥100μm, and high drop resistance ≥800mm, making it more suitable for various display protective glass applications.

[0055] This invention provides a lithium aluminum silicon glass, prepared using the method described above. This glass exhibits greater surface compressive stress and a deeper compressive stress layer, resulting in superior mechanical properties and drop resistance. Testing shows that this glass can withstand a directional drop of up to 1500mm on 180-grit sandpaper.

[0056] In summary, this invention provides a lithium aluminum silicon glass and its preparation method. By adjusting the composition of the lithium aluminum silicon glass, during chemical strengthening, while ensuring that the stability and other properties of the glass are not affected, the composition of the lithium aluminum silicon glass is adjusted to promote ion exchange, forming a thicker composite compressive stress layer on the glass surface. This improves the glass's strength, surface compressive stress, bending resistance, and drop resistance. Through secondary strengthening, small ions in the glass exchange with large ions in the salt bath, generating compressive stress (CS) and a compressive stress layer (DOL) on the glass surface, further enhancing the mechanical properties and drop resistance of the lithium aluminum silicon glass.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the technical solution of the present invention in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can be modified and replaced in several simple ways, and these modifications and replacements are all within the scope of protection covered by the claims.

Claims

1. A lithium aluminum silicon glass, characterized in that, The raw material components, by mass percentage of the oxides, include the following: The glass composition consists of 56.12 wt% SiO2, 23.98 wt% Al2O3, 2.87 wt% B2O3, 3.43 wt% Li2O, 3.64 wt% Na2O, 1.11 wt% K2O, 0.66 wt% CaO, 1.83 wt% SrO, 6.26 wt% P2O5, and 0.11 wt% SnO; RO is the sum of the mass percentages of MgO, ZnO, CaO, and SrO in the glass composition, and RO is 2.49%; the strengthening conditions of the lithium aluminum silicon glass are as follows: first, strengthening at 430℃ for 90 min in a mixed salt of 64 wt% KNO3 and 36 wt% NaNO3; then strengthening at 430℃ for 30 min in a mixed salt of 98 wt% KNO3 and 2 wt% NaNO3.

2. The lithium aluminum silicon glass according to claim 1, characterized in that, Its surface compressive stress CS is 1157MPa, and its directional drop height on 180-grit sandpaper is 1500mm.

3. The lithium aluminum silicon glass according to claim 1, characterized in that, Its compressive stress layer DOL is 135.6 μm, and DOL / t is 0.19, where t is the thickness of the lithium aluminum silicon glass.

4. A method for preparing lithium aluminum silicon glass, characterized in that, include: The following mixtures were prepared by mass percentage of oxides: 56.12 wt% SiO2, 23.98 wt% Al2O3, 2.87 wt% B2O3, 3.43 wt% Li2O, 3.64 wt% Na2O, 1.11 wt% K2O, 0.66 wt% CaO, 1.83 wt% SrO, 6.26 wt% P2O5, and 0.11 wt% SnO. The mixture was then melted, clarified, homogenized, shaped, and annealed to obtain a glass sample. RO is the sum of the mass percentages of MgO, ZnO, CaO, and SrO in the glass composition, and RO is 2.49%. The glass sample is cut and polished to obtain glass products; The glass product is first strengthened in the first mixed molten salt; The glass product after the first strengthening is subjected to a second strengthening in the second mixed molten salt to complete the preparation of lithium aluminum silicon glass; Wherein, both the first mixed molten salt and the second mixed molten salt are mixed molten salts of NaNO3 and KNO3.

5. The method for preparing lithium aluminum silicon glass according to claim 4, characterized in that, In the first mixed molten salt, NaNO3 is 36 wt%, and the remainder is KNO3.

6. The method for preparing lithium aluminum silicon glass according to claim 4, characterized in that, In the second mixed molten salt, KNO3 is 98 wt%, and the remainder is NaNO3.

7. The method for preparing lithium aluminum silicon glass according to claim 4, characterized in that, The first strengthening process was carried out at a temperature of 430°C for 90 minutes.

8. The method for preparing lithium aluminum silicon glass according to claim 4, characterized in that, The second strengthening process was carried out at a temperature of 430°C for 30 minutes.

9. The method for preparing lithium aluminum silicon glass according to claim 4, characterized in that, The thickness of the glass product is ≥0.4mm and ≤2mm.

10. A lithium aluminum silicon glass, characterized in that, Prepared by the method described in any one of claims 4-9.

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