Method of making low expansion crystallized glass-ceramics and t

Details Method of making low expansion crystallized glass-ceramics and t Method of making low expansion crystallized glass-ceramics and t

1979-10-09

1981-08-25

Vertiz, O. R.

Compositions: coating or plastic

Coating or plastic compositions

Marking

106 398, 65 33, C03C 322, C03C 304, C03C 320, C03B 3200

Patent

active

042857287

ABSTRACT:
Colored and/or transparent, low expansion, crystallized glass-ceramic articles are formed by a method of thermal in situ crystallization from thermally crystallizable glass melts having lithium-containing crystals as the predominant crystalline species. The crystallized glass-ceramics produced in accordance with the method are low expansion substances, illustratively in the range of -10 to +10.sub.x 10.sup.-7 per .degree.C. (0.degree.-300.degree. C.). Telescope mirror blanks can be made from these transparent low expansion crystallized glass-ceramics.

REFERENCES:
patent: 1532002 (1925-03-01), Thomson
patent: 3121605 (1964-02-01), Nunn
patent: 3157522 (1964-11-01), Stookey
patent: 3241985 (1966-03-01), Kuwayama
patent: 3282712 (1966-11-01), Tashiro et al.
patent: 3380818 (1968-04-01), Smith

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