Glass manufacturing – Processes – Glass preform treating
Patent
1997-02-22
2000-01-11
Green, Anthony
Glass manufacturing
Processes
Glass preform treating
65 173, 65 176, 65 22, 65 301, 65DIG8, 264653, 264654, 264660, 264666, 264674, 264681, 501 53, 501 54, 501 55, C03B 2000
Patent
active
060123044
ABSTRACT:
A number of unique processes are disclosed for manufacture of sintered high-purity quartz glass products in which a shaped silica body or preform is made from an aqueous slurry of micronized silica particles by gel casting, slip casting or electrophoretic deposition. The silica particles may comprise a major portion by weight of crystalline silica. In one embodiment of the invention the sintered quartz glass is transparent, substantially bubble-free and suitable for scientific or optical uses. In another embodiment the porous silica preform is fired in steam to increase the hydroxyl content and then nitrided in a nitrogen-hydrogen reducing atmosphere. A minute amount of chemically-combined nitrogen in the high-purity quartz glass is sufficient to provide a tremendous improvement in physical properties and an incredible increase in the resistance to devitrification.
REFERENCES:
patent: 3535890 (1970-10-01), Hansen
patent: 3763294 (1973-10-01), Nicastro
patent: 3775077 (1973-11-01), Nicastro
patent: 3837825 (1974-09-01), Loxley
patent: 5389582 (1995-02-01), Loxley et al.
Blackmer John F.
Loxley Ted A.
Peters Klaus-Markus
Green Anthony
Greene Vincent A.
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