Low expansion transparent glass-ceramic

Details Low expansion transparent glass-ceramic Low expansion transparent glass-ceramic

1995-06-02

1997-01-07

Group, Karl

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 7, 501 63, 501 70, C03C 1014

Patent

active

055916821

ABSTRACT:
A low expansion glass-ceramic which has a coefficient of thermal expansion (.alpha..times.10.sup.-7 /.degree.C.) within the range of from -5 to +5 within a temperature range of from -60.degree. C. to +160.degree. C., has a remarkably reduced variation of 10 ppm or below in relative length of .DELTA.1/1, has an excellent optical homogeneity owing to reduced melting temperature in the base glass, and has an improved transparency is obtained by restricting the ratio in weight of P.sub.2 O.sub.5 to SiO.sub.2 within the range of from 0.08 to 0.20, and adding Li.sub.2 O, MgO, ZnO, CaO and BaO of specific content ranges as essential ingredients in a base glass of a SiO.sub.2 -P.sub.2 O.sub.5 -Al.sub.2 O.sub.3 -Li.sub.2 O system containing TiO.sub.2 and ZrO.sub.2 as nucleating agents, and As.sub.2 O.sub.3 as an optional ingredient.

REFERENCES:
patent: 3928229 (1975-12-01), Neuroth
patent: 4755488 (1988-07-01), Nagashima
patent: 4835121 (1989-05-01), Shibuya et al.
patent: 5064460 (1991-11-01), Aitken
patent: 5336643 (1994-08-01), Goto et al.

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