阅读说明：本技术 玻璃用组合物、铝硅酸盐玻璃及其制备方法和应用 (Composition for glass, aluminosilicate glass, and preparation method and application thereof ) 是由 李青 李赫然 李刚 胡恒广 张广涛 闫冬成 于 2019-10-14 设计创作，主要内容包括：本发明涉及玻璃制造领域,公开了一种玻璃用组合物、铝硅酸盐玻璃及其制备方法和应用。该玻璃用组合物的总重量为基准,以氧化物计,所述玻璃用组合物含有58-64wt％的SiO<Sub>2</Sub>、18-23wt％的Al<Sub>2</Sub>O<Sub>3</Sub>、0-1.6wt％的B<Sub>2</Sub>O<Sub>3</Sub>、0.001-0.3wt％的ZrO<Sub>2</Sub>、0.0005-1.8wt％的金属氧化物M以及12-24wt％的金属氧化物N；所述金属氧化物M选自BeO、Sc<Sub>2</Sub>O<Sub>3</Sub>和Y<Sub>2</Sub>O<Sub>3</Sub>中的一种或多种,所述金属氧化物N选自MgO、CaO和SrO中的一种或多种。本发明提供的铝硅酸盐玻璃将玻璃料性、成型稳定性控制在较窄的限定范围内,利于玻璃板大型化、轻薄化生产控制,同时有利于对玻璃退火后弯曲度的控制,使玻璃高良率得到的保证。(The invention relates to the field of glass manufacturing, and discloses a composition for glass, aluminosilicate glass, and a preparation method and application thereof. The composition for glass contains SiO 58-64 wt% calculated by oxide based on the total weight of the composition for glass 2 18-23 wt% of Al 2 O 3 0-1.6 wt% of B 2 O 3 0.001 to 0.3 wt% of ZrO 2 0.0005 to 1.8 wt% of a metal oxide M and 12 to 24 wt% of a metal oxide N; the metal oxide M is selected from BeO and Sc 2 O 3 And Y 2 O 3 The metal oxide N is selected from one or more of MgO, CaO and SrO. The aluminosilicate glass provided by the invention controls the glass material property and the forming stability in a narrow limited range, is beneficial to controlling the large-scale and light-weight production of glass plates, is beneficial to controlling the bending degree of the annealed glass, and ensures the high yield of the glass.)

1. A composition for glass, characterized in that the composition for glass contains 58 to 64 wt% of SiO in terms of oxide based on the total weight of the composition for glass₂18-23 wt% of Al₂O₃0-1.6 wt% of B₂O₃0.001 to 0.3 wt% of ZrO₂0.0005 to 1.8 wt% of a metal oxide M and 12 to 24 wt% of a metal oxide N; the metal oxide M is selected from BeO and Sc₂O₃And Y₂O₃The metal oxide N is selected from one or more of MgO, CaO and SrO.

2. The composition for glass according to claim 1, wherein the composition for glass contains 59 to 62 wt% of SiO in terms of oxide based on the total weight of the composition for glass₂18-21 wt% of Al₂O₃0.001-1.5 wt% of B₂O₃0.001 to 0.2 wt% of ZrO₂0.1 to 1.5 wt% of metal oxide M and 16 to 19 wt% of metal oxide N.

3. The composition for glass as defined in claim 1, wherein the total iron content of the glass composition is 100-330ppm based on the total weight of the composition for glass;

preferably, of the total iron, Fe³⁺The iron content was 80 wt.% based onThe following steps of (1);

preferably, the content of alkali metal oxide in the composition for glass is 350ppm or less in terms of oxide based on the total weight of the composition for glass;

preferably, the SO in the composition for glass is based on the total weight of the composition for glass₃The content of (B) is less than 350 ppm;

preferably, the content of halogen in the composition for glass is 0.004-0.5 wt% calculated by elementary halogen based on the total weight of the composition for glass;

preferably, the halogen is F and/or Cl.

4. The composition for glass according to any one of claims 1 to 3, wherein the metal oxide M contains 0 to 100 wt% of BeO based on the total weight of the metal oxide M;

preferably, the metal oxide M contains 0 to 100 wt.% Sc, based on the total weight of the metal oxide M₂O₃；

Preferably, the metal oxide M contains 0 to 100 wt% of Y based on the total weight of the metal oxide M₂O₃。

5. The composition for glass according to any one of claims 1 to 3, wherein the metal oxide N contains SrO in an amount of 33 to 48 wt% based on the total weight of the metal oxide N;

preferably, the mass ratio of MgO to CaO is between 0.8 and 2.

6. A method of making an aluminosilicate glass, the method comprising: the composition for glass according to any one of claims 1 to 5 is subjected to melting treatment, molding treatment, annealing treatment and machining treatment in this order.

7. The aluminosilicate glass produced by the method of claim 6.

8. The aluminosilicate glass of claim 7, wherein the aluminosilicate glass has a viscosity of 10¹³The annealing point temperature corresponding to poise is 770-820 ℃;

preferably, the aluminosilicate glass has a melting temperature T corresponding to a viscosity of 200 poise₂₀₀＜1710℃；

Preferably, the aluminosilicate glass has a density < 2.65g/cm³；

Preferably, the aluminosilicate glass has a coefficient of thermal expansion of (33-41) × 10 in the range of 50-350 ℃^-7/℃；

Preferably, the aluminosilicate glass has a viscosity of 10000 poise and a corresponding forming temperature T_1wHas a viscosity of 4 × 10 with the aluminosilicate glass⁷Poise time corresponding to forming temperature T_4kwDifference value T of_1w-T_4kw295 ℃ and 365 ℃.

9. The aluminosilicate glass of claim 7, wherein the curvature is 0.15% or less when the aluminosilicate glass is 0.5mm thick;

preferably, the aluminosilicate glass has a thermal conductivity > 1.2W/(mk);

preferably, the Young modulus of the aluminosilicate glass is more than or equal to 78 GPa;

preferably, the aluminosilicate glass has a light transmission > 70% at a wavelength of 308 nm.

10. Use of a composition for glass according to any of claims 1 to 5 or an aluminosilicate glass according to any of claims 7 to 9 for the preparation of a substrate and/or a carrier for a flat panel display.

Technical Field

The invention relates to the field of glass manufacturing, and particularly relates to a composition for glass, aluminosilicate glass, and a preparation method and application thereof.

Background

In the development process of the display industry, Low Temperature Polysilicon (LTPS) technology enables display products to have the characteristics of higher resolution, faster response speed, lighter and thinner appearance, larger display area, and the like.

In the manufacturing process of the display panel, the substrate glass is more prone to deformation and warpage due to heat treatment, and thus the product is poor, and therefore the substrate glass is required to have the characteristics of high temperature resistance, low heat shrinkage and stable high-temperature process. In order to achieve the above purpose, the existing substrate glass mostly adopts high-alumina low-borosilicate glass which is substantially alkali-free, the high-alumina low-borosilicate glass has low thermal shrinkage and glass strain point, but the melting and forming difficulty of the high-alumina low-borosilicate glass is high, especially the glass thinning forming is realized by adjusting the glass frit property through composition, and the bending degree after the glass thinning is difficult to control.

Disclosure of Invention

The invention aims to solve the problems that the existing aluminosilicate glass is difficult to melt and form, difficult to form large plates, easy to bend in the production process and the like, and provides a composition for glass, aluminosilicate glass and a preparation method and application thereof.

In order to achieve the above object, a first aspect of the present invention provides a composition for glass containing 58 to 64 wt% of SiO, calculated as an oxide, based on the total weight of the composition for glass₂18-23 wt% of Al₂O₃0-1.6 wt% of B₂O₃0.001 to 0.3 wt% of ZrO₂0.0005 to 1.8 wt% of a metal oxide M and 12 to 24 wt% of a metal oxide N; the metal oxide M is selected from BeO and Sc₂O₃And Y₂O₃The metal oxide N is selected from one or more of MgO, CaO and SrO.

Preferably, the composition for glass contains 59 to 62 wt% of SiO in terms of oxide based on the total weight of the composition for glass₂18-21 wt% of Al₂O₃0.001-1.5 wt% of B₂O₃0.001 to 0.2 wt% of ZrO₂0.1 to 1.5 wt% of metal oxide M and 16 to 19 wt% of metal oxide N.

Preferably, the total iron content of the glass composition is 100-330ppm based on the total weight of the glass composition.

Preferably, of the total iron, Fe³⁺The iron content is 80 wt% or less.

Preferably, the content of the alkali metal oxide in the composition for glass is 350ppm or less in terms of oxide based on the total weight of the composition for glass.

Preferably, the SO in the composition for glass is based on the total weight of the composition for glass₃The content of (B) is 350ppm or less.

Preferably, the halogen content of the composition for glass is 0.004-0.5 wt% calculated by elementary halogen based on the total weight of the composition for glass.

Preferably, the halogen is F and/or Cl.

Preferably, the metal oxide M contains 0 to 100 wt% BeO based on the total weight of the metal oxide M.

Preferably, the metal oxide M contains 0 to 100 wt.% Sc, based on the total weight of the metal oxide M₂O₃。

Preferably, the metal oxide M contains 0 to 100 wt% of Y based on the total weight of the metal oxide M₂O₃。

Preferably, the metal oxide N contains SrO in an amount of 33 to 48 wt% based on the total weight of the metal oxide N.

Preferably, the mass ratio of MgO to CaO is between 0.8 and 2.

In a second aspect, the present invention provides a method of making an aluminosilicate glass, the method comprising: the composition for glass of the present invention is subjected to melting treatment, molding treatment, annealing treatment and machining treatment in this order.

In a third aspect, the present invention provides an aluminosilicate glass prepared by the above method.

Preferably, the aluminosilicate glass has a viscosity of 10¹³The annealing point temperature corresponding to the poise time is 770-820 ℃.

Preferably, the aluminosilicate glass has a melting temperature T corresponding to a viscosity of 200 poise₂₀₀＜1710℃。

Preferably, the aluminosilicate glass has a density < 2.65g/cm³。

Preferably, the aluminosilicate glass has a coefficient of thermal expansion of (33-41) × 10 in the range of 50-350 ℃^-7/℃。

Preferably, the aluminosilicate glass has a viscosity of 10000 poise and a corresponding forming temperature T_1wHas a viscosity of 4 × 10 with the aluminosilicate glass⁷Poise time corresponding to forming temperature T_4kwDifference value T of_1w-T_4kw295 ℃ and 365 ℃.

Preferably, when the thickness of the aluminosilicate glass is 0.5mm, the bending degree is less than or equal to 0.15 percent.

Preferably, the aluminosilicate glass has a thermal conductivity > 1.2W/(mk).

Preferably, the Young's modulus of the aluminosilicate glass is more than or equal to 78 GPa.

Preferably, the aluminosilicate glass has a light transmission > 70% at a wavelength of 308 nm.

In a fourth aspect, the invention provides the use of the composition for glass or aluminosilicate glass of the invention in the preparation of a flat panel display substrate and/or carrier.

According to the invention, through reasonably adjusting the components of the glass composition, the glass material property and the forming stability of the aluminosilicate glass can be controlled within a narrow limited range, which is beneficial to controlling large-scale and light-thin production of glass plates, and on the other hand, the heat conductivity coefficient of the glass is optimized, which is beneficial to controlling the curvature of the annealed glass, so that the high yield of the glass is ensured.

Detailed Description

The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In a first aspect, the present invention provides a composition for glass comprising 58 to 64 wt% of SiO in terms of oxide, based on the total weight of the composition for glass₂18-23 wt% of Al₂O₃0-1.6 wt% of B₂O₃0.001 to 0.3 wt% of ZrO₂0.0005 to 1.8 wt% of a metal oxide M and 12 to 24 wt% of a metal oxide N; m is selected from BeO and Sc₂O₃And Y₂O₃And N is selected from one or more of MgO, CaO and SrO.

In a preferred embodiment of the present invention, the composition for glass contains 59 to 62 wt% of SiO in terms of oxide based on the total weight of the composition for glass₂18-21 wt% of Al₂O₃0.001-1.5 wt% of B₂O₃0.001 to 0.2 wt% of ZrO₂0.1 to 1.5 wt% of metal oxide M and 16 to 19 wt% of metal oxide N.

In the composition for glass of the present invention, SiO₂Is a glass network forming body, is a main component of a glass system, and is also a framework of a glass network structure. It can improve thermal stability and reduce thermal expansion coefficient. Therefore, taken together, SiO is calculated as the oxide based on the total weight of the composition for glass₂The content of (B) is 58-64 wt%; preferably, SiO₂The content of (B) is 59-62 wt%. Specifically, for example, the amount of the organic solvent may be 58 wt%, 58.5 wt%, 59 wt%, 59.5 wt%, 60 wt%, 60.3 wt%, 60.8 wt%, 61 wt%, 61.5 wt%, 62 wt%, 63 wt%, 63.2 wt%, 64 wt%, or any two of these valuesAny value within the range of (a).

In the composition for glass of the present invention, Al₂O₃The glass is a network intermediate, is another key index for improving the heat resistance, the mechanical strength and the bending resistance of the high-aluminum low-boron alkali-free glass, participates in a glass network, plays a role of a former, and can improve the compactness of a glass structure so as to improve the density and the physical and chemical properties. Therefore, in consideration of the fusion molding, thermal shrinkage and mechanical strength of the glass, Al is contained in terms of oxides based on the total weight of the composition for glass₂O₃The content of (A) is 18-23 wt%; preferably, Al₂O₃The content of (B) is 18-21 wt%. Specifically, for example, it may be 18 wt%, 18.5 wt%, 19 wt%, 19.2 wt%, 19.4 wt%, 19.5 wt%, 19.6 wt%, 20 wt%, 20.3 wt%, 20.8 wt%, 21 wt%, 22 wt%, 22.3 wt%, 22.5 wt%, 23 wt%, or any two of these values.

In the composition for glass of the present invention, the metal oxide M (selected from BeO and Sc)₂O₃、Y₂O₃One or more of) is a component for reducing the melting temperature, the forming viscosity and the expansion coefficient of the glass substrate, and can improve the heat conductivity coefficient, the 308 nanometer ultraviolet transmittance, the Young modulus and the like of the glass substrate, wherein the improvement of the heat conductivity of the BeO on the glass is several times of that of alumina, the heat conductivity coefficient of the glass can be obviously improved, the annealing quality of large glass is improved, and the bending degree of the glass substrate after the glass is annealed is reduced. However, as the content of the metal oxide M increases, some properties are not improved any more, and the production cost is increased significantly. Therefore, in general, the content of the metal oxide M is 0.0005 to 1.8% by weight in terms of oxide, based on the total weight of the composition for glass; preferably, the content of the metal oxide M is 0.005 to 1.5 wt%; more preferably, the content of the metal oxide M is 0.1 to 1.5 wt%. Specifically, for example, it may be 0.0005 wt%, 0.001 wt%, 0.005 wt%, 0.01 wt%, 0.05 wt%, 0.1 wt%, 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.7 wt%, 1 wt%, 1.2 wt%, 1.3 wt%, 1.5 wt%, 1.8 wt%, and any two values of these valuesAny number within the constituted range.

In the composition for glass of the present invention, preferably, the metal oxide M contains 0 to 100 wt% of BeO based on the total weight of the metal oxide M; more preferably, the metal oxide M contains 1-80 wt% of BeO; further preferably, the metal oxide M contains 1-60 wt% of BeO. Specifically, for example, it may be any of 0 wt%, 10 wt%, 20 wt%, 28.57 wt%, 30 wt%, 33.33 wt%, 37.5 wt%, 40 wt%, 50 wt%, 53.33 wt%, 60 wt%, 66.67 wt%, 70 wt%, 76.92 wt%, 80 wt%, 83.33 wt%, 90 wt%, 100 wt%, and a range formed by any two of these values.

In the composition for glass of the present invention, it is preferable that the metal oxide M contains Sc in an amount of 0 to 100 wt% based on the total weight of the metal oxide M₂O₃(ii) a More preferably, the metal oxide M contains 0.1 to 80 wt.% Sc₂O₃(ii) a Further preferably, the metal oxide M contains 0.1 to 60 wt.% Sc₂O₃. Specifically, for example, it may be 0 wt%, 10 wt%, 13.33 wt%, 20 wt%, 26.67 wt%, 30 wt%, 33.33 wt%, 37.5 wt%, 40 wt%, 41.67 wt%, 42.86 wt%, 50 wt%, 60 wt%, 70 wt%, 80 wt%, 90 wt%, 100 wt%, or any number in the range of any two of these values.

In the composition for glass of the present invention, preferably, the metal oxide M contains 0 to 100 wt% of Y based on the total weight of the metal oxide M₂O₃(ii) a More preferably, the metal oxide M contains 0.01 to 50 wt% of Y₂O₃(ii) a Further preferably, the metal oxide M contains 0.01 to 30 wt% of Y₂O₃. Specifically, for example, it may be 0 wt%, 6.67 wt%, 10 wt%, 16.67 wt%, 20 wt%, 23.08 wt%, 25 wt%, 28.57 wt%, 30 wt%, 33.33 wt%, 40 wt%, 50 wt%, 60 wt%, 70 wt%, 80 wt%, 90 wt%, 100 wt%, or any number in the range of any two of these values.

In a preferred embodiment of the invention, beryllium oxide is introduced as basic beryllium carbonate, which decomposes at high temperature to generate gas, and can promote bubble discharge of the glass melt and increase the fluidity of the melt, so that the components in the melt are uniformly dispersed.

In the composition for glass of the present invention, B₂O₃Is a good fluxing agent, and under the condition of high-temperature melting, B₂O₃The high-temperature viscosity can be reduced, the low-temperature viscosity of the glass can be improved, and the glass can be prevented from crystallizing, but the Young modulus of the substrate glass can be reduced by the boron oxide. Therefore, in general, B is calculated as oxide based on the total weight of the composition for glass₂O₃The content of (B) is 0-1.6 wt%; preferably, B₂O₃The content of (B) is 0.001-1.5 wt%; more preferably, B₂O₃The content of (B) is 0.001-1.1 wt%. Specifically, for example, it may be 0 wt%, 0.001 wt%, 0.005 wt%, 0.01 wt%, 0.05 wt%, 0.1 wt%, 0.3 wt%, 0.5 wt%, 0.6 wt%, 1 wt%, 1.2 wt%, 1.5 wt%, 1.6 wt%, or any number in the range of any two of these values.

In the composition for glass, the material property of the glass is regulated and controlled by metal oxide N (one or more selected from MgO, CaO and SrO), wherein SrO has the best fluxing effect, can obviously reduce the melting temperature of the glass and prevent the glass from generating crystallization, but the content is too high, the density of the glass is larger, the thermal expansion coefficient is increased, and the chemical stability is poor; if the content of CaO is too low, the viscosity of the high-temperature glass cannot be reduced efficiently, the content is too high, the glass is easy to crystallize, the forming temperature range is reduced, and the thermal expansion coefficient is also greatly increased; the existence of MgO brings lower expansion coefficient and density and higher chemical resistance, strain point and elastic modulus to adjust various performance indexes of the substrate glass. Therefore, in general, the content of the metal oxide N is 12 to 24 wt% in terms of oxide, based on the total weight of the composition for glass; preferably, the content of metal oxide N is 14 to 22 wt%; more preferably, the content of the metal oxide N is 16 to 19 wt%. Specifically, for example, it may be 12 wt%, 13 wt%, 15 wt%, 16.2 wt%, 16.9 wt%, 17 wt%, 17.1 wt%, 17.5 wt%, 17.9 wt%, 18 wt%, 18.3 wt%, 19 wt%, 20 wt%, 22 wt%, 24 wt%, or any two of these values.

In the composition for glass of the present invention, preferably, the metal oxide N contains SrO in an amount of 33 to 48 wt% based on the total weight of the metal oxide N; more preferably, the metal oxide N contains 36-42 wt% SrO. Specifically, for example, it may be 34 wt%, 34.9 wt%, 35 wt%, 35.3 wt%, 36 wt%, 37 wt%, 38 wt%, 38.3 wt%, 39 wt%, 40 wt%, 40.2 wt%, 40.9 wt%, 41 wt%, 41.2 wt%, 42 wt%, 43 wt%, 44 wt%, 44.4 wt%, 45 wt%, 45.9 wt%, 46 wt%, 48 wt%, or any number in the range of any two of these values.

In the composition for glass of the present invention, preferably, the mass ratio of MgO to CaO is 0.8 to 2; more preferably, the mass ratio of MgO to CaO is between 0.9 and 1.75. Specifically, for example, the numerical value may be 0.8, 0.82, 0.83, 0.9, 0.91, 0.95, 1%, 1.02, 1.04, 1.1, 1.2, 1.22, 1.3, 1.33, 1.4, 1.44, 1.5, 1.55, 1.6, 1.7, 1.75, 1.8, 1.9, 2, or any two of these values.

In the composition for glass of the present invention, ZrO₂The intermediate oxide can improve the chemical stability of the glass, reduce the expansion coefficient of the glass, increase the content, is difficult to melt and is easy to crystallize. Thus, in general, ZrO is calculated as oxides based on the total weight of the composition for glass₂The content of (B) is 0.001-0.3 wt%; preferably, ZrO₂The content of (B) is 0.001-0.2 wt%. Specifically, for example, it may be 0.001 wt%, 0.002 wt%, 0.003 wt%, 0.005 wt%, 0.01 wt%, 0.02 wt%, 0.03 wt%, 0.05 wt%, 0.1 wt%, 0.2 wt%, 0.3 wt%, or any value in a range of any two of these values.

SiO introduced into high-aluminum low-boron alkali-free glass system₂Using high-purity quartz sand, whichLarge dosage and high production cost, and the total iron content and Fe content of the main impurity-ferric oxide in the high-purity quartz sand are introduced into the glass³⁺The influence on the light transmittance of 308nm is most obvious, so that in order to enhance the market competitiveness of products and reduce the production cost, the total iron content in the glass composition is 100-330ppm based on the total weight of the composition for glass; preferably, the total iron content of the glass composition is 160-250ppm, based on the total weight of the composition for glass.

In the composition for glass of the present invention, preferably, Fe is contained in the total iron³⁺The iron content is less than 80 wt%; more preferably, of the total iron, Fe³⁺The iron content is less than 70 wt%; further preferably, of the total iron, Fe³⁺The iron content is 65 wt% or less.

In the composition for glass of the present invention, the content of the alkali metal oxide in the composition for glass is preferably 350ppm or less in terms of oxide based on the total weight of the composition for glass.

In the composition for glass of the present invention, it is preferable that SO in the composition for glass is contained in an amount of SO based on the total weight of the composition for glass₃The content of (B) is 350ppm or less.

In the composition for glass of the present invention, preferably, the composition for glass contains a fining agent. The content of the refining agent is not particularly limited, and the content of the refining agent is less than or equal to 0.5 wt% calculated by oxide based on the total weight of the composition for glass, and the chemical refining agent is preferably selected from one or more of strontium sulfate, calcium sulfate, strontium nitrate and stannous oxide.

In the composition for glass of the present invention, preferably, the content of halogen in the composition for glass is 0.004 to 0.5 wt% in terms of elemental halogen based on the total weight of the composition for glass.

Preferably, the halogen is F and/or Cl.

In a second aspect, the present invention provides a method of making an aluminosilicate glass, the method comprising: the composition for glass of the present invention is subjected to melting treatment, molding treatment, annealing treatment and machining treatment in this order.

In the method of the present invention, for the specific definition of the composition for glass, reference is made to the corresponding description above, and details are not repeated here.

The method for producing the aluminosilicate glass is not particularly required, and for example, the method may include: the raw materials of the composition for glass are fully and uniformly mixed, and are kept warm for 7 to 24 hours in a platinum rhodium crucible at 1630-. And then pouring the melted glass liquid on a stainless steel mold for molding, annealing at the temperature of 800 ℃, and then carrying out mechanical processing to obtain the aluminosilicate glass.

The mechanical processing treatment is not particularly limited, and various mechanical processing methods commonly used in the art may be used, and for example, the product obtained by the annealing treatment may be cut, ground, polished, or the like.

In a third aspect, the present invention provides an aluminosilicate glass prepared by the above method.

The thickness of the above aluminosilicate glass may vary within a wide range, and may be a thickness of a high-alumina low-boron alkali-free glass known to those skilled in the art, for example, a thickness of 0.05 to 1.2mm, or a selection range may be appropriately expanded according to the thickness requirement of the glass substrate.

The aluminosilicate glass of the present invention preferably has a viscosity of 10¹³The annealing point temperature corresponding to poise is 770-820 ℃; more preferably, the viscosity is 10¹³The annealing point temperature at poise is 780-815 ℃.

In the float glass forming process, the control of the temperature drop curve is one of the key technologies for producing high-quality glass, the change of the temperature drop curve in the thinning area directly influences the change of the transverse thickness distribution of the glass ribbon, the temperature drop speed after the glass ribbon is drawn out of the thinning area directly determines the warping formation and the glass cutting quality, the natural temperature reduction process of the glass ribbon in the forming area is closely related to the material property of the glass, the reasonable control of the material property temperature is favorable for ensuring the glass quality,the design and manufacturing cost of the forming and annealing equipment are reduced, therefore, the aluminosilicate glass of the invention preferably has a forming temperature T corresponding to a viscosity of 10000 poises_1wAnd a viscosity of 4 × 10⁷Poise time corresponding to forming temperature T_4kwThe difference value of 295-365 ℃; more preferably, the forming temperature T corresponds to a viscosity of 10000 poise_1wAnd a viscosity of 4 × 10⁷Poise time corresponding to forming temperature T_4kwThe difference value of the temperature difference is 300-360 ℃; further preferably, the molding temperature T corresponds to a viscosity of 10000 poise_1wAnd a viscosity of 4 × 10⁷Poise time corresponding to forming temperature T_4kwThe difference is 305-355 ℃.

The aluminosilicate glass of the present invention preferably has a melting temperature T corresponding to a viscosity of 200 poise₂₀₀(iii) less than 1710 ℃; more preferably, the melting temperature T corresponds to a viscosity of 200 poise₂₀₀(iii) less than 1700 ℃; further preferably, the melting temperature T corresponds to a viscosity of 200 poise₂₀₀＜1690℃。

The aluminosilicate glass of the present invention preferably has a density of < 2.65g/cm³(ii) a More preferably, the aluminosilicate glass has a density of < 2.63g/cm³(ii) a Further preferably, the aluminosilicate glass has a density < 2.62g/cm³。

The aluminosilicate glass of the present invention preferably has a thermal expansion coefficient of (33-41) × 10 in the range of 50-350 DEG C^-7/. degree.C., more preferably (35-40) × 10^-7Further preferred is (35-39) × 10/. degree.C^-7/℃。

By utilizing the principle that the physical characteristics of adjacent areas of the flat glass are consistent or similar, two adjacent glass strips are cut on the flat glass, the upper surfaces of the two pieces of glass are oppositely overlapped with the upper surfaces or the lower surfaces of the two pieces of glass are oppositely overlapped with the lower surfaces, the heads and the tails of the two pieces of glass are kept consistent, and the curvature is calculated by measuring the maximum gap between the two pieces of glass. The bending degree is an important functional index considering the glass, and the bending degree of the aluminosilicate glass is preferably less than or equal to 0.15 percent when the thickness of the aluminosilicate glass is 0.5 mm; more preferably, the aluminosilicate glass has a tortuosity < 0.12% at a thickness of 0.5 mm; further preferably, the aluminosilicate glass has a bow of < 0.1% at a thickness of 0.5 mm.

The aluminosilicate glass of the present invention preferably has a thermal conductivity > 1.2W/(mk); more preferably, the aluminosilicate glass has a thermal conductivity > 1.3W/(mk); further preferably, the aluminosilicate glass has a thermal conductivity > 1.35W/(mk).

The aluminosilicate glass of the invention preferably has the Young modulus of more than or equal to 78 GPa; more preferably, the aluminosilicate glass has a Young's modulus > 80 GPa; further preferably, the aluminosilicate glass has a Young's modulus > 82 GPa.

The aluminosilicate glass of the invention preferably has a light transmission of more than 70% at a wavelength of 308 nm; more preferably, the aluminosilicate glass has a light transmission > 72% at a wavelength of 308 nm; further preferably, the aluminosilicate glass has a light transmission > 75% at a wavelength of 308 nm.

The float production process has high glass quality, high yield, homogeneous glass temperature band, sufficient glass annealing stress and capacity of drawing ultrathin electronic display glass continuously and fast. The process comprises the following steps of melting glass raw materials at high temperature in an electric boosting melting furnace with oxy-fuel combustion, clarifying, stirring, homogenizing and cooling the glass raw materials through a platinum channel, then flowing the glass liquid into a tin bath, spreading, flattening and thinning the glass liquid on the tin liquid surface under the combined action of the gravity of the glass liquid, the surface tension and the tension of a transition roller table, and forming the glass liquid into a glass belt with smooth upper and lower surfaces; and (4) conveying the glass to an annealing furnace for annealing through a transition roller table, and cutting to obtain a float glass product. According to the invention, the content of each component in the aluminosilicate glass is adjusted, so that the melting temperature and the high-temperature viscosity are reduced, the glass forming is facilitated, the ultraviolet transmittance is improved, and the heat conduction coefficient is improved; meanwhile, the boron oxide is reduced and the beryllium oxide is increased, so that a good fluxing effect is achieved, the Young modulus is improved, the bending caused by dead weight in the substrate conveying process is avoided, the 308 nanometer ultraviolet transmittance is increased, and the light weight of the glass substrate is realized.

In a fourth aspect, the invention provides the use of the composition for glass or aluminosilicate glass of the invention in the preparation of a flat panel display substrate and/or carrier.