Process for production of pure transparent quartz

Details Process for production of pure transparent quartz Process for production of pure transparent quartz

1995-10-10

1997-09-09

Czaja, Donald E.

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 301, 501 54, C03B 1900, C03C 1500

Patent

active

056651333

ABSTRACT:
Pure transparent quartz glass is provided by molding powdery amorphous silica into an article, converting the molded powdery amorphous silica into crystalline silica of high-temperature type cristobalite structure, and then fusing the crystalline silica, the quartz glass containing impurities respectively at a content of not higher than 1 ppm, and an OH group at a content of not higher than 20 ppm, and having a viscosity of 10.sup.12.0 poise or more at 1200.degree. C. The quartz glass is transparent and has high purity, and is excellent in high temperature viscosity characteristics. The quartz glass can be produced at a low cost.

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Introduction to Ceramics, by Kingery et al. pp. 71,764 1975.
Patent Abstracts of Japan, vol. 12, No. 444 (C-545), Nov. 22, 1988, JP-63-166730, Jul., 1988.
Patent Abstracts of Japan, vol. 13, No. 457 (C-644) (3805), Oct. 16, 1989, JP-1-176243,.
Database WPI, Derwent Publications, AN-89-360753, JP-1-270530, Oct. 27, 1989.

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