Cristobalite reinforcement of high silica glass

Details Cristobalite reinforcement of high silica glass Cristobalite reinforcement of high silica glass

1990-05-16

1991-10-01

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

65 2, 164 39, 432262, 501 8, C03C 1014, C03B 3700

Patent

active

050533592

ABSTRACT:
A high-density silica glass article with excellent thermal shock characteristics is formed from a high purity vitreous silica containing an aluminum compound as a crystallization aid and having a dense concentration of cristobalite muclei. The aluminum compound is aluminum oxide, aluminum hydroxide, an aluminum salt, or other aluminum-oxide precursor.
A refractory silica glass crucible made according to the invention has remarkable advantages in a Czochralski crystal-growing process. The entire crucible can be crystallized during the initial melt down in the Cz furnace to provide a cristobalite inner surface which effectively resists attack by the molten silicon to minimize contamination problems during crystal growing.
Another embodiment of the invention relates to a unique drawn silica glass with good flexural strength having fibrous oriented veins of cristobalite embedded in a matrix of vitreous silica and having remarkable resistance to deformation at temperatures of 1500.degree. C. and higher as are encountered in certain ferrous casting and investment casting processes.

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"Glass:Science and Technology", vol. 1, 1983, pp. 122-123, 128-129,147,182,415,442 and 443.
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