Process for forming two different indices of refraction in a gla

Details Process for forming two different indices of refraction in a gla Process for forming two different indices of refraction in a gla

1976-11-30

1978-01-17

Bashore, S. Leon

Glass manufacturing

Processes

Devitrifying glass or vitrifying crystalline glass

65111, 65114, 65115, 65117, 65DIG7, C03C 1500, C03B 2500, C03B 3100

Patent

active

040690318

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.

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