Method for producing heat-resistant synthetic quartz glass

Details Method for producing heat-resistant synthetic quartz glass Method for producing heat-resistant synthetic quartz glass

1996-10-16

1998-06-16

Czaja, Donald E.

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 176, 65 301, 65 63, 65 64, 65111, 65424, 65474, C03B 1901, C03B 1909, C03B 3700, C03C 1500

Patent

active

057662916

ABSTRACT:
A porous silica body with a density of 0.1 g/cm.sup.3 to 0.5 g/cm.sup.3 and a density variation of less than 30% is subjected to a first heat-treatment in an ammonia-containing atmosphere, a second heat-sintering in non-oxidizing atmosphere, and further heat-treatment at a temperature in the range of 1400.degree. C. to 2000.degree. C. under an increased pressure of 500 kg/cm.sup.2 or more in a non-oxidizing atmosphere.

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patent: 4414014 (1983-11-01), Bruning et al.
patent: 4938788 (1990-07-01), Segawa et al.
patent: 4961767 (1990-10-01), Schermerhorn et al.
patent: 5045508 (1991-09-01), Brow et al.
patent: 5126081 (1992-06-01), Willingham et al.
patent: 5410428 (1995-04-01), Yamagata et al.

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