Flexible glass having high elastic modulus and preparation method therefor

Abstract

Disclose in the present invention are flexible glass having a high elastic modulus and a preparation method therefor. The flexible glass is prepared from the following raw materials in percentage by weight: 55.0-60.0% of SiO2, 16.0-21.0% of Al2O3, 13.3-19.0% of B2O3, 2.8-13.0% of CaCO3, 2.2-3.4% of MgO, 0.3-1.8% of SrCO3, 0.1-4.4% of Ba(NO3)2, 0.8-2.0% of BeCO3, and additionally, on the basis of the total weight of the raw materials, 0.2-0.4 wt% of SnO. The raw materials are uniformly mixed and poured into a platinum crucible, melted clear at 1580-1700°C, then poured into a stainless steel mold for molding, transferred to an annealing furnace at 550-650°C for annealing and cooling, and subjected to thinning and strengthening processing.

Description

Flexible glass with high elastic modulus and preparation method thereof Technical Field

[0001] The invention belongs to the technical field of glass manufacturing and relates to flexible glass and a preparation method thereof. Background Art

[0002] With the development of emerging fields such as curved and flexible displays, market interest in foldable electronic devices and flexible displays is growing. Furthermore, the application of flexible glass is making information display devices increasingly thinner and lighter, especially in the field of foldable screens. To meet the development needs of these new fields, ultra-thin flexible glass must be bendable, lightweight, and machinable, while also possessing high elastic modulus, high hardness, high transmittance, and resistance to chemical corrosion. Currently, flexible glass faces a contradiction between achieving high-frequency bending and repeated flexing while maintaining high mechanical strength.

[0003] The elastic modulus of glass primarily depends on the chemical strength and structure of the internal particles. Stronger chemical bonds reduce deformation and increase the elastic modulus. The bond strength between particles is related to radius and the number of valence electrons. A smaller radius and a greater number of valence electrons lead to stronger bonds and a higher elastic modulus. The influence of composition and structure on fracture toughness is complex and conflicting. A suitable solution for balancing the elastic modulus, mechanical strength, and fracture toughness of glass has yet to be found.

[0004] Summary of the Invention

[0005] The purpose of the present invention is to make up for the deficiencies of the prior art and provide a flexible glass with a high elastic modulus and a method for preparing the same. The present invention improves the elastic modulus of the glass while ensuring its fracture toughness by adjusting the glass components, that is, improving the elastic modulus of the glass from the perspective of glass composition and structure, thereby resolving the contradiction between flexible glass being able to achieve small curvature bending and repeated bending and having high mechanical strength.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] A flexible glass with a high elastic modulus, characterized by being made of the following raw materials in percentage by weight:

[0008] SiO255.0~60.0%, Al2O316.0~21.0%, B2O313.3~19.0%, CaCO32.8~13.0%, MgO 2.2~3.4%, SrCO3 0.3~1.8%, Ba(NO3)20.1~4.4%, BeCO30.8~2.0%.

[0009] 0.2-0.4 wt% of SnO is added based on the total weight of the raw materials.

[0010] Furthermore, the flexible glass with a high elastic modulus is characterized by being made of the following raw materials in weight percentage: SiO2 55.0-60.0%, Al2O3 16.0-21.0%, B2O3 13.3-19.0%, CaCO3 2.8-13.0%, MgO 2.2-3.4%, SrCO3 0.3-1.8%, Ba(NO3)2 0.1-4.4%, BeCO3 0.8-2.0%, and SnO in an amount of 0.2-0.4wt% of the total weight of the raw materials.

[0011] A method for preparing flexible glass with a high elastic modulus, characterized by comprising the following steps:

[0012] (1) weighing raw materials according to the above weight percentages, then placing all the raw materials in a mortar and mixing them evenly to prepare a glass batch;

[0013] (2) Pour the mixed glass batch into a platinum crucible, then place it in a high-temperature furnace and melt it at 1580-1700°C for 3-6 hours;

[0014] (3) After the batch material is melted and clarified, it is poured into a stainless steel mold and formed, and then transferred to an annealing furnace at 550-650°C for 40-60 minutes to eliminate the residual stress in the glass structure;

[0015] (4) After annealing, the glass is cooled to room temperature in the furnace. After cooling to room temperature, conventional thinning, strengthening and processing are carried out to obtain a flexible glass with a high elastic modulus.

[0016] Furthermore, the melting temperature in step (2) is 1580-1700°C.

[0017] Furthermore, the annealing temperature in step (3) is 550-650°C.

[0018] Due to its extremely thin thickness, flexible glass can exhibit poor bending properties during the drawing process during the manufacturing process. This can lead to cracks and breakage during cutting and bending, resulting in a low flexibility index. Chemical thinning and strengthening processes can reduce these defects, while chemical strengthening can further enhance the bending properties of flexible glass.

[0019] Advantages of the present invention: The present invention mainly adjusts the proportion of the batch materials and introduces Be 2+ To improve the elastic modulus of glass, while ensuring its fracture toughness, improve the elastic modulus of glass, and then improve the bending performance of glass, and formulate an ultra-thin flexible glass with a good bending radius.

[0020] Implementation Method

[0021] Example 1 A flexible glass with a high elastic modulus,

[0022] (1) Weigh the following raw materials according to mass percentage: SiO2 57.5%, Al2O3 19.0%, B2O3 15.0%, CaCO3 4.0%, MgO 2.5%, SrCO3 0.5%, Ba(NO3)2 0.5%, BeCO3 1.0%, and add SnO 0.2 wt% of the total weight of the raw materials;

[0023] (2) Then, all the raw materials are put into a mortar and mixed evenly to prepare a glass batch;

[0024] (3) Pour the mixed glass batch into a platinum crucible, then place it in a resistance high temperature box and melt it at 1680°C for 3.5 hours;

[0025] (4) After the ingredients are melted and clarified, they are poured into a mold and, after forming, transferred to an annealing furnace at a temperature of 600°C for 40 minutes to eliminate residual stress in the glass structure;

[0026] (5) After annealing, the glass is cooled to room temperature in the furnace. After cooling to room temperature, conventional thinning, strengthening, and processing are performed to obtain an ultra-thin flexible glass. Example

[0027] (1) Weigh the following raw materials according to the following mass percentages: SiO2 55.0%, Al2O3 16.0%, B2O3 16.0%, CaCO3 6.0%, MgO 3.0%, SrCO3 1.0%, Ba(NO3)2 1.5%, BeCO3 1.5%, and add SnO 0.2 wt% of the total weight of the raw materials;

[0028] (2) Then, all the raw materials are put into a mortar and mixed evenly to prepare a glass batch;

[0029] (3) Pour the mixed glass batch into a platinum crucible, then place it in a resistance high temperature box and melt it at 1600°C for 5.5 hours;

[0030] (4) After the ingredients are melted and clarified, they are poured into a mold and, after forming, transferred to an annealing furnace at a temperature of 600°C for 50 minutes to eliminate residual stress in the glass structure;

[0031] (5) After annealing, the glass is cooled to room temperature in the furnace. After cooling to room temperature, conventional thinning, strengthening, and processing are performed to obtain an ultra-thin flexible glass.

[0032] Example

[0033] (1) Weigh the following raw materials according to mass percentage: SiO2 55.0%, Al2O3 17.0%, B2O3 14.0%, CaCO3 7.0%, MgO 2.8%, SrCO3 1.2%, Ba(NO3)2 1.8%, BeCO3 1.2%, and add SnO 0.2 wt% of the total weight of the raw materials;

[0034] (2) Then, all the raw materials are put into a mortar and mixed evenly to prepare a glass batch;

[0035] (3) Pour the mixed glass batch into a platinum crucible, then place it in a resistance high temperature box and melt it at 1650°C for 4.5 hours;

[0036] (4) After the ingredients are melted and clarified, they are poured into a mold and, after forming, transferred to an annealing furnace at a temperature of 630°C for 40 minutes to eliminate residual stress in the glass structure;

[0037] (5) After annealing, the glass is cooled to room temperature in the furnace. After cooling to room temperature, conventional thinning, strengthening, and processing are performed to obtain an ultra-thin flexible glass.

[0038] Table 1 Example batch material percentage

[0039] Table 2 below shows the flexible glass on the market as a control group.

[0040] Table 2

[0041] Table 3 below is a comparison of the performance results of the embodiment and the comparison group

[0042] Table 3

[0043] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. It should be pointed out that for ordinary technicians in this field, several improvements and changes can be made without departing from the creative concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A flexible glass with a high elastic modulus, characterized in that Made from the following raw materials in weight percentage: SiO255.0~60.0%, Al2O316.0~21.0%, B2O313.3~19.0%, CaCO32.8~13.0%, MgO2.2~3.4%, SrCO30.3~1.8%, Ba(NO3)20.1~4.4%, BeCO30.8~2.0%, 0.2-0.4wt% SnO is added based on the total weight of the raw materials.

2. A flexible glass with a high elastic modulus according to claim 1, characterized in that It is made of the following raw materials in weight percentage: SiO2 55.0-60.0%, Al2O3 16.0-21.0%, B2O3 13.3-19.0%, CaCO3 2.8-13.0%, MgO 2.2-3.4%, SrCO3 0.3-1.8%, Ba(NO3)2 0.1-4.4%, BeCO3 0.8-2.0%, and 0.2-0.4wt% SnO of the total weight of the raw materials.

3. A method for preparing a flexible glass with a high elastic modulus according to claim 1 or 2, characterized in that The steps include: (1) weighing raw materials according to the above weight percentages, then putting all the raw materials into a mortar and mixing them evenly to prepare a glass batch; (2) pouring the mixed glass batch into a platinum crucible, and then placing it in a high-temperature furnace and melting it at 1580-1700° C. for 3-6 hours; (3) After the batch material is melted and clarified, it is poured into a stainless steel mold for molding, and then transferred to an annealing furnace at 550-650°C for annealing for 40-60 minutes to eliminate residual stress in the glass structure; (4) After annealing, the glass is cooled to room temperature in the furnace. After cooling to room temperature, conventional thinning, strengthening and processing are carried out to obtain a flexible glass with a high elastic modulus.

4. A flexible glass with a high elastic modulus according to claim 3, characterized in that: The melting temperature in step (2) is 1580-1700°C.

5. A flexible glass with a high elastic modulus according to claim 3, characterized in that The annealing temperature in step (3) is 550-650°C.

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