Process for preparing stabilized high cristobalite

Details Process for preparing stabilized high cristobalite Process for preparing stabilized high cristobalite

1987-10-13

1989-04-04

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501133, 501154, 423327, 423329, C03C 1014

Patent

active

048187291

ABSTRACT:
A process for preparing a stabilized high cristobalite from a gel comprising ultramicroscopic particles of SiO.sub.2, Na.sub.2 O, and Al.sub.2 O.sub.3 where the ratio of moles of Na.sub.2 O to Al.sub.2 O.sub.3 is from about 0.95 to about 1.1, and the molar ratio of SiO.sub.2 to Al.sub.2 O.sub.3 is between about 10 and about 40. After the gel is formed, it is heated at 800-1400.degree. C. for a time sufficient to form stabilized high cristobalite.

REFERENCES:
patent: 3445252 (1969-05-01), MacDowell
patent: 3700471 (1972-10-01), Duke
patent: 4050946 (1977-09-01), Li
patent: 4073655 (1978-02-01), Li
patent: 4395388 (1983-07-01), Kaduk

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