Glass-ceramics and process for making same

Details Glass-ceramics and process for making same Glass-ceramics and process for making same

1976-05-10

1977-04-12

Garvin, Patrick P.

Compositions: coating or plastic

Coating or plastic compositions

Marking

106 52, C03C 304, C03C 322

Patent

active

040173178

ABSTRACT:
Thermally crystallizable glasses of the Na.sub.2 O--Ta.sub.2 O.sub.5 --SiO.sub.2 and the Na.sub.2 O--Li.sub.2 O--Ta.sub.2 O.sub.5 -SiO.sub.2 systems, and glass-ceramics made therefrom which are highly transparent, have high indices of refraction, and excellent strength properties. By varying the heat treatment schedule for crystallization of a glass to a glass-ceramic, a specific high index of refraction coming within a prescribed range may be imparted to the finished transparent glass-ceramic. A transparent glass-ceramic having two or more different indices of refraction may also be produced.

REFERENCES:
patent: 3006776 (1961-10-01), Geffchen
patent: 3113877 (1963-12-01), Janakuamo-Rao
patent: 3114066 (1963-12-01), Allen et al.
patent: 3529980 (1970-09-01), Bromen et al.
patent: 3573939 (1971-04-01), Beall

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