Transparent glass ceramic with small thermal expansion

Details Transparent glass ceramic with small thermal expansion Transparent glass ceramic with small thermal expansion

1974-10-03

1976-08-31

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Marking

106 398, 106 52, C03C 322, C03C 304

Patent

active

039778860

ABSTRACT:
Colorless, transparent glass ceramic with a linear thermal expansion which is smaller than 15 .times. 70.sup.-.sup.7 /.degree.C in the temperature range from 20.degree. to 300.degree.C, produced from a glass, which has been melted and shaped and thereafter subjected to a heat treatment for the controlled crystallization of innumerable, irregularly oriented, minute crystals of the structural type of .beta.-quartz, characterized in that it has, to at least 85% by weight, the following composition based on oxides:

REFERENCES:
patent: 3241985 (1966-03-01), Kuwayama
patent: 3252811 (1966-05-01), Beall
patent: 3282712 (1966-11-01), Tashiro
patent: 3499773 (1970-03-01), Petticrew
patent: 3537868 (1970-11-01), Kosaka
patent: 3573077 (1971-03-01), Beall
patent: 3585055 (1971-06-01), Beall
patent: 3642504 (1972-02-01), Petzold
patent: 3788865 (1974-01-01), Babcock et al.

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