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Transparent glass ceramic with low expansion coefficient and production method of product thereof

A low expansion coefficient, glass-ceramic technology, applied in the field of glass-ceramic products, to achieve the effect of high elastic modulus

Inactive Publication Date: 2019-09-10
广东科迪微晶玻璃实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no production method for various extra-large and extra-thick glass products produced by transparent glass-ceramics, such as a 4-ton heavy, 2.2-meter-diameter, and 0.35-meter-thick astronomical reflecting telescope mirror blank.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The low expansion coefficient transparent glass-ceramic of present embodiment is made up of the weight percent of following each component: Li 2 O: 3.7%; A 2 lO 3 : 22%; SiO 2 : 60.3%; CaO: 1.8%; MgO: 0.7%; ZnO: 2.2%; BaO: 1.0%; K 2 O: 0.5%; Na 2 O: 0.5%; TiO 2 : 1.8%; ZrO 2 : 2.0%; P 2 o 5 : 2.0%; As 2 o 3 : 0.5%; Sb 2 o 3 : 0.5%; NaCl: 0.5%.

[0027] The method for producing extra-large and extra-thick glass products from transparent glass-ceramics with low expansion coefficient in this embodiment, the process flow includes:

[0028] (1) Ingredients according to the formula provided; (2) Mixing; (3) Melting: 4.8M 2 Heat-exchanging fuel oil or natural gas pool furnace melting, temperature 1560 ° C; (4) cooling: 1440 ° C ~ 1520 ° C; (5) pouring molding, temperature 1370 ° C ~ 1440 ° C, 20 minutes to complete the large glass (Φ2.2 meters, thickness 0.35 meters, weight 4 tons) this glass does not crystallize above 1330°C, and does not crystallize during the ...

Embodiment 2

[0031] The low expansion coefficient transparent glass-ceramic of the present embodiment is made up of the weight percent of following each component: Li 2 O: 4.0%; A 2 lO3 : 20.5%; SiO 2 : 66%; CaO: 2.5%; MgO: 0.3%; ZnO: 0.4%; BaO: 0.5%; K 2 O: 0.5%; Na 2 O: 0.5%; TiO 2 : 1.8%; ZrO 2 : 1.0%; P 2 o 5 : 0.5%; As 2 o 3 : 0.5%; Sb 2 o 3 : 0.4%; NaCl: 0.6%.

[0032] The production method of low expansion coefficient transparent glass-ceramics blown and rolled products of this embodiment, its technological process comprises:

[0033] (1) Ingredients according to the formula provided; (2) Mixing; (3) Melting, 4.8M 2 Heat-exchanging oil or natural gas pool furnace melting, temperature 1560°C-1600°C; (4) cooling, 1470°C-1520°C; (5) molding (blowing, pressing, drawing, calendering) 1400°C-1440°C mold and equipment or overflow molding or pressing molding; (6) annealing, 630 / 1h self-cooling; (7) heat treatment: At this time, the glass color is light brown and transparent...

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PUM

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Abstract

The invention discloses a transparent glass ceramic with low-expansion coefficient and a production method of a product thereof. The glass ceramic comprises the following components in percentage by weight: Li2O: 3.0-4.2%; A2lO3: 19.5-22.5%; SiO2: 60.0-68.0%; CaO: 0.4-3.5%; MgO: 0.0-1.0%; ZnO: 0.0-6.1%; BaO: 0.0-2.0%; B2O3: 0.0-2.5%; R2O: 0.3-0.7%; TiO2: 1.6-2.5%; ZrO2: 1.0-2.0%; P2O5: 0.5-5.0%; As2O3: 0.2-0.5%; Sb2O3: 0.3-0.6%; and NaCl: 0.3-0.6%. The transparent glass ceramic with low expansion coefficient prepared by the formula has high elastic modulus, is suitable for hot forming of super-thick super-large products, has the characteristic of no deformation of precision grinding, polishing and cold processing, and for example is suitable for blow molding of hot forming of thick products such as astronomical reflecting telescope mirror blanks with the weight of 4 tons, the diameter of 2.2 meters and the thickness of 0.35 meter, is suitable for hot forming and precision grinding coldprocessing of resonant cavity working bodies of cesium atomic clocks with no deformation, and is suitable for cutting, grinding and cold processing of ultrathin plates, or manufacturing of 5G mobilephone back plates of ultrathin and high-strength transparent glass ceramics by an overflow method and the like.

Description

technical field [0001] The invention belongs to the technical field of glass-ceramic products, in particular to a production method of transparent glass-ceramic with low expansion coefficient and its products. Background technique [0002] There are many types of glass-ceramics, and glass products with different uses can be produced by different composition ratios and different processes. Most of the glass-ceramics disclosed in patent documents are architectural decorative materials, biological materials, handicraft products or small heating products, etc. At present, there is no production method for various extra-large and extra-thick glass products produced by transparent glass-ceramics, such as 4 tons in weight, 2.2 meters in diameter, and 0.35 meters in thickness. Contents of the invention [0003] The technical problem to be solved by the present invention is to improve the formula of the existing glass-ceramics, and provide a material composition and a production m...

Claims

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Application Information

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IPC IPC(8): C03C3/11C03B32/02C03C10/12C03C10/14
CPCC03B32/02C03C3/11C03C10/0009C03C10/0027
Inventor 赵天佑蔡来吉杨镇胜周漫娟
Owner 广东科迪微晶玻璃实业有限公司
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