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Process for preparing non-alumina silicate glass

A technology of aluminosilicate glass and alkali aluminosilicate, applied in the field of alkali-free aluminosilicate glass, can solve the problems of unusable glass and strong blackening tendency.

Inactive Publication Date: 2006-09-27
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example in the case of halogen lamp glass, the tendency to blacken due to tungsten deposition is so strong that the glass cannot be used in this application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] As Example 1, a glass having the same basic composition as that of the Comparative Example was prepared, which contained 0.04% by weight of Fe 2 o 3 , no Sb 2 o 3 . 0.5% by weight of BaO was added as barium nitrate, and 0.2% by weight of BaO was added as barium sulfate, which corresponds to 0.1% by weight of SO 3 . In addition, the same raw materials were used and melted at the same melting rate.

[0123] Its bubble count was reduced to <5 / kg glass, indicating effective fining. Except for a few larger bubbles, the desired effect of practically no more fine seeds and the reduction of fine bubbles to favor the formation of a few large bubbles that tend to rise and escape the melt is very good clarification Another sign of .

[0124] The tubes prepared according to Comparative Example and Example 1 were processed into halogen tungsten lamps, and subjected to a lighting test at 650°C. Lamps made from glass clarified with sulphate (example) than lamps made from glass...

Embodiment 2

[0128] As Example 2, a glass with the following basic composition (% by weight based on oxide) was prepared for adjusting the transmittance:

[0129] SiO 2 : 60.7;

[0130] B 2 o 3 : 0.3;

[0131] Al 2 o 3 : 16.5;

[0132] BaO: 7.85;

[0133] CaO: 13.5;

[0134] ZrO 2 :1.0;

[0135] Fe 2 o 3 : 0.04. 0.5% by weight of BaO was added as barium nitrate, 0.3% by weight of BaO was added as barium sulfate, which corresponds to 0.15% by weight of SO 3 . Melting point>1640°C, other corresponding to the above-mentioned preparation conditions. Here too, an excellent glass quality is achieved, ie <5 bubbles / kg glass.

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Abstract

The process of the invention produces alkali-free aluminosilicate glass having an Al2O3-content of more than 12% by weight with the addition of from 0.005% by weight to 0.6% by weight of sulfate for batch formulation.

Description

field of invention [0001] The invention relates to a process for the preparation of alkali-free aluminosilicate glasses, except for unavoidable impurities, the Al 2 o 3 The content (based on the weight % of the oxide) is greater than 12% by weight. Background technique [0002] The glass production process consists of the steps of frit formulation, also called frit charging, glass melting and its subsequent thermoforming. The term melting also includes clarification, homogenization and conditioning for further processing after the melting step. [0003] Refining in relation to melting means the removal of air bubbles from the melt. To achieve a very high degree of free gas and bubbles, the molten frit needs to be thoroughly mixed and degassed. Gases or gas bubbles in glass melts and their removal are described, for example, in "Manufacturing Defects in Glass Technology (Glastechnische Fabrikationsfehler)", by H. Jebsen-Marwedel and R. Brückner, third edition, 1980, publi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/083C03C3/091C03C3/093C03C3/097C03C1/00C03C3/085C03C3/087
CPCC03C1/004C03C3/085C03C3/093C03C3/091C03C3/083
Inventor F·奥特K·瑙曼恩O·贝克尔R·迪泽尔
Owner SCHOTT AG
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