Method of making fused silica articles

Details Method of making fused silica articles Method of making fused silica articles

1994-07-05

1996-08-20

Czaja, Donald E.

Glass manufacturing

Processes

Sol-gel or liquid phase route utilized

65 173, 65 174, 65 175, 65 176, 65 321, C03B 802, C03B 2000

Patent

active

055474829

ABSTRACT:
This invention is directed to the production of essentially defect-free high purity fused silica glass articles, the method comprising the following steps: (a) forming a green body from silica particulates or a porous body of amorphous silica; (b) sintering said body in a chamber by raising the temperature of the chamber to above 1720.degree. C., while purging the chamber with helium or applying a vacuum to the chamber; and (c) consolidating the sintered body in a chamber by raising the temperature within the chamber to at least 1750.degree. C., introducing an inert gas into the chamber at a pressure less than about 6.9 MPa (1000 psig), and cooling the chamber while maintaining the pressurized atmosphere to a temperature at least below the annealing point of the glass. In the most preferred practice, a green body of silica particulates will be prepared via a sol-gel process.

REFERENCES:
patent: 3261676 (1966-07-01), Morelock
patent: 4336048 (1982-06-01), van der Steen et al.
patent: 4728351 (1988-03-01), Meerman
patent: 4789389 (1988-12-01), Schermerhorn et al.
patent: 4857092 (1989-08-01), Meerman
patent: 4961767 (1990-10-01), Schermerhorn et al.

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