Sol-gel method for making ultra-low expansion glass

Details Sol-gel method for making ultra-low expansion glass Sol-gel method for making ultra-low expansion glass

Filed on

1987-05-29

Date issued

1988-11-22

Examiner

Dixon, Jr., William R.

Patent Class

Compositions: ceramic

SubClass

Ceramic compositions

SubSubClass

Glass compositions, compositions containing glass other than...

Other Related Categories

501 54, 501 55, 2523132, 2523156, 423 78, 423338, C03C 306

Type

Patent

Status

active

Patent number

047866187

Description

ABSTRACT:
Ultra-low thermal expansion TiO.sub.2 --SiO.sub.2 glasses are prepared using a sol-gel process wherein a stable alkali silicate solution comprising colloidal TiO.sub.2 and having a pH above 9 is gelled to form a semisolid silicate gel, the gel comprising homogeneously dispersed colloidal TiO.sub.2 but being essentially free of agglomerated TiO.sub.2 particles, washing the gel with aqueous media to remove alkali therefrom, and finally drying and consolidating the gel to a clear, void-free TiO.sub.2 --SiO.sub.2 glass which is substantially free of compositional inhomogeneities and has a thermal expansion coefficient below that of pure fused silica.

REFERENCES:
patent: 3597252 (1971-08-01), Schroder et al.
patent: 3678144 (1972-07-01), Shoup
patent: 4576921 (1986-03-01), Lane

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