US 4,363,647 A · Method of making fused silica-containing material

Abstract

This invention is directed to the production of fused silica-containing glass articles of large cross section or diameter wherein at least a surface layer thereof exhibits very high optical quality. The method involves depositing via flame hydrolysis/oxidation reaction a layer of fused silica-containing soot onto a supporting bait, essentially immediately thereafter applying a source of heat concentrated uniformly across the breadth of the soot deposit, but focused only over a relatively small area thereof, to raise the temperature within that area sufficiently to uniformly consolidate the soot in that area into a non-porous glass, and then cooling the glass to room temperature.

Claims10

Dependent claims

A method for preparing a fused silica-containing glass article of very high optical quality and having a large cross section or diameter, which comprises the steps of:

(a) depositing via flame hydrolysis/oxidation reaction a layer of fused silica-containing soot upon a supporting bait;
(b) essentially immediately thereafter applying a source of heat concentrated uniformly across the breadth of the soot deposit, but focused only over a relatively small area thereof, to raise the temperature thereof sufficiently to uniformly consolidate said small area of soot deposited into an essentially non-porous glass;
and then
(c) cooling said glass to room temperature.

1 more element

Dependencies are inferred from the claim text.

Method of making fused silica-containing material

Life of this patent

Method of making fused silica-containing material

Life of this patent

Abstract

Claims10