Method of manufacturing synthetic silica glass
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsMasatoshi Takita, Takaaki Shimizu
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Abstract
A method for manufacturing synthetic silica glass by reacting methyl silicate and aqueous ammonia, dispersing the silica particles produced in water, solidifying the silica by the addition of methyl silicate and heating, dehydrating, de-solventing, decarburizing and sintering the solid silica to produce a glass product. The sintered glass may be pulverized to produce a powder. The inventive method is easily carried out and avoids the high energy costs of the prior art. The glass product obtained exhibits excellent high temperature viscosity.
Claims9
A method for manufacturing synthetic silica glass comprising the steps of:
- (a) reacting methyl silicate and aqueous ammonia to produce silica particles;
- (b) dispersing the silica particles in water to obtain a dispersion solution having a pH of from about 9 to 13;
- (c) adding methyl silicate to the solution in an amount such that the silica contained in the additive methyl silicate accounts for 5 to 20% by weight of the overall silica;
- (d) heating, dehydrating, de-solventing, and decarburizing the solid silica;
- and
- (e) sintering the solid silica at a temperature of about 1400.degree. C. or higher.
Dependencies are inferred from the claim text.