Glass, preparation method and application

Abstract

The present invention discloses glass, a preparation method, and applications, relating to the field of glass manufacturing technology. The glass comprises components of silicon dioxide, aluminum oxide, boron oxide, sodium oxide, potassium oxide, magnesium oxide, and calcium oxide; the weight relationship between silicon dioxide, aluminum oxide, and boron oxide satisfies a specific quantitative relationship, and the weight relationship between the above seven components satisfies another specific quantitative relationship. The glass produced by the present invention exhibits high stress strength and stress depth, and its scratch and impact resistance meet the requirements of display devices such as smart terminals.

Description

Technical Field

[0001] The present invention relates to the technical field of glass manufacturing, and in particular to glass, a preparation method and application thereof. Background Art

[0002] The trend toward lighter and thinner devices like mobile phones and tablets is driving the demand for thinner display components on these devices. However, display components are primarily made of glass, and as the thickness decreases, the strength of the glass decreases. Furthermore, demands for scratch resistance are becoming increasingly stringent. Existing soda-lime-silica glass cannot simultaneously meet the requirements for high strength, high deformation resistance, and scratch resistance at low thicknesses. There is a need to develop a glass that offers high strength, high hardness, and good scratch resistance at low thicknesses. Summary of the Invention

[0003] The main purpose of the present invention is to develop a glass, preparation method and application, so that its strength and hardness at a relatively low thickness can meet the use requirements, and can meet the hardness and strength requirements of glass in various application scenarios such as smart terminal display screens, automobile protective glass and windows.

[0004] To achieve the above object, the present invention provides a glass, which comprises the following components, by weight percentage: silicon dioxide: 60.5wt% to 65wt%; aluminum oxide: 11wt% to 17wt%; boron oxide: 3.5wt% to 8.5wt%; sodium oxide: 12wt% to 15wt%; potassium oxide: 0.5wt% to 2wt%; magnesium oxide: 0.4wt% to 3wt%; calcium oxide: 0.1wt% to 1.5wt%; wherein the weight percentage of silicon dioxide, aluminum oxide and boron oxide is 1.5wt% to 2.5wt%; The relationship between the amounts, calculated as a percentage by weight, satisfies: 25.86≤0.36×SiO2+0.78×Al2O3-0.53×B2O3≤34.81; and / or the relationship between the weights of the silicon dioxide, aluminum oxide, boron oxide, sodium oxide, potassium oxide, magnesium oxide and calcium oxide, calculated as a percentage by weight, satisfies: 7.78≤0.42×SiO2-0.47×(B2O3-Al2O3)-1.03×(Na2O-K2O)-2.58×(MgO-CaO)≤22.57.

[0005] In one embodiment, the glass comprises the following components, calculated by weight percentage: silicon dioxide: 62.1wt% to 65wt%; aluminum oxide: 13.2wt% to 17wt%; boron oxide: 3.5wt% to 6.8wt%; sodium oxide: 12wt% to 14wt%; potassium oxide: 0.9wt% to 2wt%; magnesium oxide: 0.4wt% to 2wt%; calcium oxide: 0.1wt% to 1wt%; wherein the weight relationship of silicon dioxide, aluminum oxide and boron oxide is calculated by weight. In percentage, it satisfies: 29.05≤0.36×SiO2+0.78×Al2O3-0.53×B2O3≤34.81; and / or, the weight relationship of the silicon dioxide, aluminum oxide, boron oxide, sodium oxide, potassium oxide, magnesium oxide and calcium oxide, in weight percentage, satisfies: 13.02≤0.42×SiO2-0.47×(B2O3-Al2O3)-1.03×(Na2O-K2O)-2.58×(MgO-CaO)≤22.57.

[0006] In one embodiment, the glass has a T 200 、T 35000 、T x and T S The following relations are satisfied:

[0007] 2.55≤(T 200 -T 35000 ) / (T x -T S )≤3.09;

[0008] In the formula, the T 200 The temperature at which the viscosity of glass is 200 poise is T 35000 The temperature corresponding to the viscosity of glass being 35,000 poise is T x is the upper limit temperature of glass crystallization, T S The softening temperature of glass.

[0009] In one embodiment, the glass has a T 200 ≤1585℃.

[0010] In one embodiment, the glass has a T 35000 ≤1090℃.

[0011] In one embodiment, the glass has a T x ≤1003℃.

[0012] In one embodiment, the glass has a T S ≤818℃.

[0013] In one embodiment, the glass has a T 35000 and the T of the glassx The difference is greater than 80℃.

[0014] In one embodiment, when the thickness of the glass is 0.6 mm, the stress strength CS value of the glass is greater than 910 MPa.

[0015] In one embodiment, when the thickness of the glass is 0.6 mm, the stress layer depth DOL value of the glass is ≥41 μm.

[0016] In one embodiment, when the thickness of the glass is 0.6 mm, the Vickers hardness value of the glass is greater than 710 HV.

[0017] In one embodiment, when the thickness of the glass is 0.02 mm, the stress strength CS value of the glass is greater than 400 MPa.

[0018] In one embodiment, when the thickness of the glass is 0.02 mm, the stress layer depth DOL value of the glass is ≥10 μm.

[0019] In one embodiment, when the thickness of the glass is 0.02 mm, the Vickers hardness value of the glass is ≥590 HV.

[0020] The present invention also provides a method for preparing the glass, which comprises the following steps:

[0021] S10, mixing, melting, clarifying, homogenizing, shaping, and annealing the components of the raw materials according to a proportion to obtain a glass intermediate;

[0022] S20, cutting the glass intermediate product obtained in step S10;

[0023] S30, chemically strengthening the glass intermediate product cut in step S20 to obtain the glass.

[0024] In one embodiment, in step S20, the thickness of the cut glass intermediate product is controlled to be 0.02 mm to 0.6 mm.

[0025] In one embodiment, in step S30, the chemical strengthening specifically includes the following steps:

[0026] The glass intermediate product after the cutting process in step S20 is kept at 270° C. to 320° C. for 25 min to 40 min, and then placed in molten salt for chemical strengthening treatment, the chemical strengthening temperature is controlled to be 400° C. to 430° C., and the chemical strengthening time is controlled to be 0.25 h to 4 h; wherein the molten salt includes 0 to 1 wt % NaNO3 and 99 wt % to 100 wt % KNO3.

[0027] The present invention also provides a display device, which uses the glass.

[0028] The technical solution of the present invention provides a composition and specific ratio of aluminosilicate glass, wherein sodium oxide, potassium oxide, magnesium oxide and calcium oxide are added to silicon dioxide, aluminum oxide and boron oxide as main components, so that the grid structure in the glass phase is strengthened; the present invention also reasonably controls the composition and specific ratio of aluminosilicate glass to make the temperature T of the glass at a specific viscosity 200 and T 35000 And the upper limit temperature of glass crystallization T x , glass softening temperature T S The specific relationship is satisfied, thereby further improving the strength, hardness and scratch resistance of the glass, while also reducing the difficulty of glass molding during the glass production process; in the preparation method of the present invention, through pretreatment and chemical strengthening processes, the glass surface is promoted to quickly exchange ions and reach a certain stress layer depth, thereby further enhancing the stress intensity and stress depth of the glass, thereby enhancing the scratch resistance and impact resistance of the glass. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] The technical problem addressed by this application is that, with the increasing popularity of smart terminals such as mobile phones and tablet computers and the trend towards thinner and lighter devices, the thickness of display components on these smart devices, such as display screens, is required to continue to decrease. However, the strength of glass decreases significantly as the thickness decreases, making it brittle. Existing soda-lime-silica glass cannot simultaneously meet the requirements of low thickness, high strength, high deformation resistance, and scratch resistance.

[0033] In order to solve the above technical problems, a glass with strength and hardness at a low thickness that can meet the requirements of smart terminal display screens, automobile protective glass, automobile windows, etc. for glass materials is designed. The present invention proposes a glass, a preparation method and application.

[0034] The present invention provides a glass, which comprises the following components, calculated by weight percentage: silicon dioxide: 60.5wt% to 65wt%; aluminum oxide: 11wt% to 17wt%; boron oxide: 3.5wt% to 8.5wt%; sodium oxide: 12wt% to 15wt%; potassium oxide: 0.5wt% to 2wt%; magnesium oxide: 0.4wt% to 3wt%; calcium oxide: 0.1wt% to 1.5wt%; wherein the weight relationship of silicon dioxide, aluminum oxide and boron oxide is as follows: In terms of weight percentage, the following conditions are satisfied: 25.86≤0.36×SiO2+0.78×Al2O3-0.53×B2O3≤34.81; and / or, the weight relationship of the silicon dioxide, aluminum oxide, boron oxide, sodium oxide, potassium oxide, magnesium oxide and calcium oxide, in terms of weight percentage, satisfies: 7.78≤0.42×SiO2-0.47×(B2O3-Al2O3)-1.03×(Na2O-K2O)-2.58×(MgO-CaO)≤22.57.

[0035] It should be noted that the silica content in the glass is 60.5wt% to 65wt%, and may include but is not limited to the values ​​listed above. As the main component of the glass grid structure, in the technical solution of the present invention, if the silica content is too low, the thermal expansion coefficient of the resulting glass will increase, making the glass difficult to form and reducing chemical corrosion resistance. If the silica content is too high, the impact resistance of the glass will be reduced, which is not conducive to the production of thinner glass.

[0036] It should also be noted that the aluminum oxide content in the glass is 11wt% to 17wt%, and can be 11wt%, 12.4wt%, 13.2wt%, 14wt%, 15.1wt%, 16.4wt%, or 17wt%, including but not limited to the values ​​listed above. As a network modifier, the aluminum oxide in the aluminum oxide forms a four-coordinate aluminum oxide tetrahedron [AlO4] with non-bridging oxygen, which can connect with silicon oxide tetrahedron [SiO4]. This connects the previously unconnected silicon oxide tetrahedrons [SiO4] in the glass through the aluminum oxide tetrahedrons, increasing the connectivity within the glass network and making the structure more compact, thereby improving the mechanical strength and thermal stability of the glass. Aluminum oxide tetrahedrons are larger in volume than silicon oxide tetrahedrons, resulting in a glass grid structure with larger gaps, which facilitates ion exchange and improves the scratch and drop resistance of the glass. It should also be noted that excessive alumina will also form an aluminum oxide octahedron [AlO6] structure. The aluminum oxide octahedron is free between the network structure and does not participate in cross-linking. Too high an aluminum oxide octahedron content will destroy the original silicon oxide network structure, reduce the stability of the glass structure, and affect its impact resistance. When the aluminum oxide content is insufficient, the glass is more susceptible to hydrolysis or acid and alkali corrosion, and the strength and impact resistance of the glass will also be significantly reduced.

[0037] It should also be noted that the content of boron oxide in the glass is 3.5wt% to 8.5wt%; it can be 3.5wt%, 3.8wt%, 4.7wt%, 5.5wt%, 6.8wt%, 7.3wt%, 8.5wt%, including but not limited to the values ​​listed above. Boron oxide in the glass includes two forms: tetrahedral structure and tricoordinate structure. The tetrahedral structure usually exists in the form of tetrahedrons, and in the glass network, it is connected with other units by sharing oxygen atoms to form a more compact network structure; the tricoordinate structure usually exists in the form of planar triangles, forming a looser network structure. A higher proportion of the tetrahedral structure is beneficial to enhancing the strength and hardness of the glass, while a higher proportion of the tricoordinate structure enables the glass to better adapt to volume changes and reduce potential cracks during the cooling process, which is beneficial to lowering the melting point of the glass and increasing the toughness of the glass. By controlling the dosage ratio of boron oxide and other components, the tetracoordinate structure and tricoordinate structure of boron oxide in the glass are in a balanced state, so that the glass of the present invention has high strength and scratch resistance at the same time under the condition of low thickness.

[0038] It should also be noted that the sodium oxide content in the glass is 12wt% to 15wt%; it may include 12wt%, 12.6wt%, 13wt%, 13.7wt%, 14wt%, 14.5wt%, 15wt%, and other values, including but not limited to the values ​​listed above. Sodium oxide, as a network exosome, is one of the main exchangeable ions during the chemical strengthening process, acting as a flux, which can lower the melting temperature of the glass and improve the chemical stability of the glass.

[0039] It should also be noted that the potassium oxide content in the glass is 0.5wt% to 2wt%; it can include 0.5wt%, 0.6wt%, 0.9wt%, 1.2wt%, 1.4wt%, 1.7wt%, 2wt%, and more, including but not limited to the values ​​listed above. Potassium oxide can also adjust the high-temperature viscosity of the glass during melting and the mechanical strength after forming. However, unlike sodium oxide, potassium oxide does not participate in the ion exchange process. Therefore, during the subsequent strengthening process, potassium oxide is the main component of the molten salt. Excessive potassium oxide will inhibit the ion exchange of the glass, which is not conducive to improving the strength of the glass.

[0040] It should also be noted that the magnesium oxide content in the glass is 0.4wt% to 3wt%; it can be 0.4wt%, 0.9wt%, 1.5wt%, 1.7wt%, 2wt%, 2.5wt%, 3wt%, including but not limited to the values ​​listed above. Magnesium oxide is mainly used to promote the melting of glass. Magnesium oxide can also generate a potential difference to promote ion exchange, thereby increasing the stress strength and depth of the glass. If the magnesium oxide content is too low, it will not significantly improve the melting effect of the glass. If the content exceeds 3wt%, it will increase the viscosity of the glass liquid, promote crystallization, and reduce the transparency and toughness of the glass.

[0041] It should also be noted that the calcium oxide content in the glass is 0.1wt% to 1.5wt%; it can include, but is not limited to, 0.1wt%, 0.3wt%, 0.5wt%, 0.8wt%, 1wt%, 1.2wt%, and 1.5wt%. Calcium oxide can reduce the crystallization tendency of the glass melt and regulate the rate and depth of ion exchange, thereby improving the chemical stability and mechanical strength of the glass.

[0042] It should also be noted that the weight relationship of the silica, alumina and boron oxide, calculated in weight percentage, satisfies the following: 25.86≤0.36×SiO2+0.78×Al2O3-0.53×B2O3≤34.81; the silica, alumina and boron oxide in the present invention are mainly connected in a three-dimensional tetrahedral structure in the glass network structure. By limiting the above quantitative relationship, the proportions of silicon oxide tetrahedrons, aluminum oxide tetrahedrons and boron oxide tetrahedrons constituting the grid body in the glass structure can reach a special balance, thereby improving the degree of connection of the glass network structure and obtaining a stable glass network structure; silica is the main glass network structure, alumina preferentially allows boron oxide to enter the glass network structure, and aluminum oxide tetrahedrons can effectively shield easily polarized oxygen atoms, making them difficult to move, thereby inhibiting the precipitation of cristobalite.

[0043] It should also be noted that the weight relationship of the silicon dioxide, aluminum oxide, boron oxide, sodium oxide, potassium oxide, magnesium oxide and calcium oxide, calculated as a percentage by weight, satisfies the following: 7.78≤0.42×SiO2-0.47×(B2O3-Al2O3)-1.03×(Na2O-K2O)-2.58×(MgO-CaO)≤22.57; by ensuring that the components in the glass satisfy the above relationship, the glass has higher chemical stability and better crystallization performance, and can also have better chemical strengthening properties.

[0044] In one embodiment, the glass comprises the following components, by weight percentage: silicon dioxide: 62.1 wt% to 65 wt%; aluminum oxide: 13.2 wt% to 17 wt%; boron oxide: 3.5 wt% to 6.8 wt%; sodium oxide: 12 wt% to 14 wt%; potassium oxide: 0.9 wt% to 2 wt%; magnesium oxide: 0.4 wt% to 2 wt%;

[0045] Calcium oxide: 0.1 wt% to 1 wt%; wherein, the weight relationship of the silicon dioxide, aluminum oxide, and boron oxide, calculated as a weight percentage, satisfies the following: 29.05≤0.36×SiO2+0.78×Al2O3-0.53×B2O3≤34.81; and / or, the weight relationship of the silicon dioxide, aluminum oxide, boron oxide, sodium oxide, potassium oxide, magnesium oxide, and calcium oxide, calculated as a weight percentage, satisfies the following: 13.02≤0.42×SiO2-0.47×(B2O3-Al2O3)-1.03×(Na2O-K2O)-2.58×(MgO-CaO)≤22.57.

[0046] It should be noted that when the components in the glass satisfy the above-mentioned ratio and weight relationship, the obtained glass has higher stress strength, stress depth and hardness at corresponding thickness.

[0047] In one embodiment, the glass has a T 200 、T 35000 、T x and T S Satisfy the following relationship: 2.55≤(T 200 -T 35000 ) / (T x -T S )≤3.09; where, the T 200 The temperature at which the viscosity of glass is 200 poise is T 35000 The temperature corresponding to the viscosity of glass being 35,000 poise is T x is the upper limit temperature of glass crystallization, T S The softening temperature of glass.

[0048] It should be noted that, in this embodiment, M is set as the glass crystallization stability factor, M=(T 200 -T 35000 ) / (T x -T SThe glass crystallization stability factor (M) is typically used to assess a glass's resistance to crystallization. Properly setting the M value can effectively prevent unnecessary crystallization during high-temperature processing, molding, and long-term use, thereby facilitating the optimization of production process parameters. Generally, a larger M value indicates easier glass manufacturing; a smaller M value indicates greater manufacturing difficulty. In this embodiment, the M value is limited to a specific range, ensuring that the resulting glass exhibits higher hardness, strength, and scratch resistance at a lower thickness.

[0049] It should also be noted that the T of the glass in this application is 200 and T 35000 The determination method includes: referring to the standard ASTM C-965, using a rotary high temperature viscometer to measure the high temperature viscosity-temperature curve of glass, and the temperature T corresponding to the viscosity of 200P 200 , 35000P viscosity corresponding to temperature T 35000 .

[0050] It should also be noted that the T of the glass in this application is x The determination method includes: determining the upper limit temperature of glass crystallization using the gradient temperature furnace method according to the standard ASTM C-829.

[0051] It should also be noted that the T of the glass in this application is s The measuring method includes: measuring the softening point of glass by referring to the method of standard ASTM C338.

[0052] In one embodiment, the glass has a T 200 ≤1585℃.

[0053] In one embodiment, the glass has a T 35000 ≤1090℃.

[0054] In one embodiment, the glass has a T x ≤1003℃.

[0055] In one embodiment, the glass has a T S ≤818℃.

[0056] It should be noted that by measuring the T 200 、T 35000 、T x and T S By limiting the temperature, on the one hand, the temperature corresponding to different process nodes in the glass production process can be lowered, which is conducive to saving energy consumption and production costs. On the other hand, it can ensure that the produced glass has higher hardness, strength and scratch resistance at a low thickness.

[0057] In one embodiment, the glass has a T 35000 and the T of the glass xThe difference is greater than 80℃.

[0058] It should be noted that, setting △T=T 35000 -T x △T is usually used to indicate the safe temperature range in which glass can avoid crystallization during the molding or processing process. It can also be understood as the processing window of glass. The larger the △T, the wider the temperature range in which the glass can remain amorphous, thereby reducing the risk of defects caused by premature crystallization.

[0059] In one embodiment, when the thickness of the glass is 0.6 mm, the stress strength CS value of the glass is greater than 910 MPa.

[0060] In one embodiment, when the thickness of the glass is 0.6 mm, the stress layer depth DOL value of the glass is ≥41 μm.

[0061] In one embodiment, when the thickness of the glass is 0.6 mm, the Vickers hardness value of the glass is greater than 710 HV.

[0062] In one embodiment, when the thickness of the glass is 0.02 mm, the stress strength CS value of the glass is greater than 400 MPa.

[0063] In one embodiment, when the thickness of the glass is 0.02 mm, the stress layer depth DOL value of the glass is ≥10 μm.

[0064] In one embodiment, when the thickness of the glass is 0.02 mm, the Vickers hardness value of the glass is ≥590 HV.

[0065] The present invention also provides a method for preparing the glass, comprising the following steps:

[0066] S10, mixing, melting, clarifying, homogenizing, shaping, and annealing the components of the raw materials according to a proportion to obtain a glass intermediate;

[0067] S20, cutting the glass intermediate product obtained in step S10;

[0068] S30, chemically strengthening the glass intermediate product cut in step S20 to obtain the glass.

[0069] In one embodiment, in step S20, the thickness of the cut glass intermediate product is controlled to be 0.02 mm to 0.6 mm.

[0070] In one embodiment, in step S30, the chemical strengthening specifically includes the following steps:

[0071] The glass intermediate product after the cutting process in step S20 is kept at 270° C. to 320° C. for 25 min to 40 min, and then placed in molten salt for chemical strengthening treatment, the chemical strengthening temperature is controlled to be 400° C. to 430° C., and the chemical strengthening time is controlled to be 0.25 h to 4 h; wherein the molten salt includes 0 to 1 wt % NaNO3 and 99 wt % to 100 wt % KNO3.

[0072] It should be noted that insulation treatment before chemical strengthening makes the temperature distribution of the glass more uniform, avoiding stress concentration caused by local temperature differences; it can also make the sodium ions on the glass surface more easily replaced, thereby increasing the depth and efficiency of ion exchange, helping to increase the thickness of the surface compressive stress layer of the glass and enhance its impact resistance.

[0073] It should also be noted that glass intermediates of different thicknesses correspond to different chemical strengthening times. When the glass thickness is 0.02 mm, the chemical strengthening time is 0.25 h; when the glass thickness is 0.6 mm, the chemical strengthening time is 4 h.

[0074] In a specific embodiment, the method for preparing the glass comprises the following steps:

[0075] S10. Calculate the required raw materials based on the designed glass composition, mix them thoroughly, and pour them into a platinum-rhodium crucible. Add a clarifier (sodium chloride) at 0.5 wt% of the raw materials. Heat at 1600°C to 1640°C for 7 hours and mix thoroughly. Remove the crucible and pour the molten glass into a preheated mold to form a block. Place the formed glass block in a muffle furnace and anneal at 600°C for 2 hours. Cool it to room temperature and remove it.

[0076] S20, cutting the glass intermediate product obtained in step S10; controlling the thickness of the cut glass intermediate product to be 0.02-0.6 mm;

[0077] S30, keeping the glass intermediate product cut in step S20 at 270-320° C. for 25-40 minutes, then placing the glass intermediate product after the insulation treatment in molten salt for chemical strengthening treatment, controlling the chemical strengthening temperature to 400-430° C. and the chemical strengthening time to 0.25-4 hours; the molten salt includes 0-1 wt % NaNO3 and 99-100 wt % KNO3.

[0078] It should be noted that the above description of the details of the preparation method is only used to explain the content of the present invention and does not limit the scope of protection of the present invention.

[0079] In addition, the present invention also provides a display device, which uses the glass. After the display device uses the glass, it has good drop resistance, impact resistance and scratch resistance.

[0080] The technical solution of the present invention is further described in detail below with reference to specific embodiments.

[0081] Unless otherwise specified, the raw materials used in the examples and comparative examples of the present application can be obtained commercially. Unless otherwise specified, the methods used are conventional methods in the art.

[0082] Related test methods:

[0083] (1) Determine T according to the method of ASTM-C338 s Value; T is measured according to ASTM C-965 200 and T 35000 ; Determine T with reference to ASTM C-829 x ;

[0084] (2) Use the Japan Orihara FSM-6000LE surface stress meter to measure the surface stress intensity CS value and surface stress depth DOL value of the glass;

[0085] (3) Determine the Vickers hardness value of glass with reference to standard GB / T4340.4-2022.

[0086] Examples 1-7

[0087] Examples 1-7 are glasses made from different raw material ratios, the difference being the different amounts of the components used, as shown in Table 1 (unit: wt %).

[0088] Comparative Example 1

[0089] Comparative Example 1 is based on Example 1, except that the amount (weight percentage) of each component is different, as shown in Table 1 (unit: wt %).

[0090] Table 1

[0091]

[0092] As shown in Table 1, the mass percentage of boron oxide in Comparative Example 1 is 1%, which does not meet the component ratio requirements of the present invention.

[0093] The preparation process of Examples 1-7 is the same as that of Comparative Example 1, and specifically comprises the following steps:

[0094] S10. Calculate the required raw materials based on the designed glass composition, mix them thoroughly, and pour them into a platinum-rhodium crucible. Add a clarifier (sodium chloride) at 0.5 wt% of the raw materials. Heat at 1600°C to 1640°C for 7 hours and mix thoroughly. Remove the crucible and pour the molten glass into a preheated mold to form a block. Place the formed glass block in a muffle furnace and anneal at 600°C for 2 hours. Cool it to room temperature and remove it.

[0095] S20, cutting the glass intermediate product obtained in step S10; controlling the thickness of the cut glass intermediate product to be 0.02-0.6 mm;

[0096] S30, keeping the glass intermediate product cut in step S20 at 300° C. for 30 minutes, then placing the glass intermediate product after the insulation treatment in molten salt for chemical strengthening treatment, controlling the chemical strengthening temperature to 400° C. and the chemical strengthening time to 4 hours; the molten salt includes 1 wt% NaNO3 and 99 wt% KNO3.

[0097] The parameters in the preparation process of Examples 1-7 and Comparative Example 1 are shown in Table 2.

[0098] Set A = 0.36 × SiO2 + 0.78 × Al2O3 - 0.53 × B2O3;

[0099] Set B = 0.42 × SiO2 - 0.47 × (B2O3 - Al2O3) - 1.03 × (Na2O - K2O) - 2.58 × (MgO - CaO);

[0100] It should be noted that "SiO2", "Al2O3", "B2O3", "Na2O", "K2O", "MgO" and "CaO" in the above relationship formula respectively refer to the weight percentage of the corresponding components in each embodiment or comparative example.

[0101] Table 2

[0102]

[0103] The properties of the glasses prepared in Examples 1-7 and Comparative Example 1 were measured, as shown in Table 3.

[0104] Table 3

[0105]

[0106] By analyzing Table 2 and Table 3, it can be seen that the glass prepared according to the formula of the present invention, that is, the glass prepared in Examples 1-7, has a melting temperature T 200 ≤1585℃; Forming temperature T35000 ≤1090℃; softening point T S ≤818℃, upper limit of crystallization temperature T x ≤1003℃, △T=(T 35000 -T x )>80°C, glass stability factor 2.55≤M≤3.09. The strengthening temperature is 400°C to 430°C, and the strengthening time is 0.25 hour to 4 hours. When the thickness of the produced glass is 6 mm, the performance parameters of the produced glass in most embodiments simultaneously meet the requirements of CS value>910MPa, DOL value ≥41μm, and Vickers hardness value>710HV.

[0107] In Comparative Example 1, the weight percentage of boron oxide is 1% and the value of A is 35.35, which does not meet the requirements of the present invention. 200 =1593℃, T 35000 =1099℃, T S =812℃, T x =1045℃, △T=(T 35000 -T x ) = 54 ° C, the glass crystallization stability factor M = 2.12. Compared with Examples 1-7, the glass in Comparative Example 1 is more difficult to produce and shape.

[0108] Further analysis of Table 2 and Table 3 shows that the various performances of Examples 3-7 are significantly better, and the performances of surface stress intensity, stress layer depth and hardness are more balanced and better.

[0109] Examples 8-11

[0110] Examples 8-11 are based on Example 1, with the difference that: in step S20, the thickness of the glass is different; and in step S30, the chemical strengthening time is different, as shown in Table 4 for details.

[0111] Table 4

[0112]

[0113] By analyzing Table 4, it can be seen that when the glass prepared in Examples 8 to 11 has a thickness of only 0.02 mm, the CS value is greater than 400 MPa, the DOL value is greater than or equal to 10 μm, and the Vickers hardness value is greater than or equal to 590 HV.

[0114] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention specification under the technical concept of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A glass, characterized in that: The glass comprises the following components by weight: Silicon dioxide: 63.1wt%~65wt%; Alumina: 14wt%~17wt%; Boron oxide: 3.5wt%~5.5wt%; Sodium oxide: 12wt%~13.7wt%; Potassium oxide: 1.2wt%~2wt%; Magnesium oxide: 0.4wt%~1.7wt%; Calcium oxide: 0.1wt%~0.8wt%; The weight relationship of the silicon dioxide, aluminum oxide and boron oxide, calculated in weight percentage, satisfies: 30.72≤0.36×SiO2+0.78×Al2O3-0.53×B2O3≤34.81; Furthermore, the weight relationship of the silicon dioxide, aluminum oxide, boron oxide, sodium oxide, potassium oxide, magnesium oxide and calcium oxide, calculated in weight percentage, satisfies: 15.3≤0.42×SiO2-0.47×(B2O3-Al2O3)-1.03×(Na2O-K2O)-2.58×(MgO-CaO)≤22.57; The glass T 200 、T 35000 、T x and T S The following relationship is satisfied: 2.6≤(T 200 -T 35000 ) / (T x -T S )≤2.68; In the formula, the T 200 The temperature at which the viscosity of glass is 200 poise is T 35000 The temperature corresponding to the viscosity of glass being 35,000 poise is T x is the upper limit temperature of glass crystallization, T S The softening temperature of glass.

2. The glass according to claim 1, wherein The glass T 200 ≤1585℃; And / or, the glass T 35000 ≤1090℃; And / or, the glass T x ≤1003℃; And / or, the glass T S ≤818℃.

3. The glass according to claim 2, wherein The glass T 35000 and the T of the glass x The difference is greater than 80℃.

4. The glass according to claim 1, wherein When the thickness of the glass is 0.6 mm, the stress strength CS value of the glass is greater than 910 MPa; And / or, when the thickness of the glass is 0.6 mm, the stress layer depth DOL value of the glass is ≥ 41 μm; And / or, when the thickness of the glass is 0.6 mm, the Vickers hardness value of the glass is greater than 710 HV.

5. The glass according to claim 1, wherein When the thickness of the glass is 0.02 mm, the stress strength CS value of the glass is greater than 400 MPa; And / or, when the thickness of the glass is 0.02 mm, the stress layer depth DOL value of the glass is ≥10 μm; And / or, when the thickness of the glass is 0.02 mm, the Vickers hardness value of the glass is ≥590 HV.

6. A method for preparing the glass according to any one of claims 1 to 5, characterized in that: The preparation method of the glass comprises the following steps: S10, mixing, melting, clarifying, homogenizing, shaping, and annealing the components of the raw materials according to a proportion to obtain a glass intermediate; S20, cutting the glass intermediate product obtained in step S10; S30, chemically strengthening the glass intermediate product cut in step S20 to obtain the glass.

7. The method for preparing glass according to claim 6, wherein: In the step S20 , the thickness of the cut glass intermediate product is controlled to be 0.02 mm to 0.6 mm.

8. The method for preparing glass according to claim 6, wherein: In step S30, the chemical strengthening specifically includes the following steps: The glass intermediate product cut in step S20 is kept at 270° C. to 320° C. for 25 to 40 minutes, and then placed in molten salt for chemical strengthening treatment, wherein the chemical strengthening temperature is controlled to be 400° C. to 430° C., and the chemical strengthening time is controlled to be 0.25 to 4 hours; The molten salt includes 0-1 wt% of NaNO3 and 99 wt%-100 wt% of KNO3.

9. A display device, characterized in that: The display device uses the glass according to any one of claims 1 to 4.

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