Transparent glass-ceramics containing gahnite

Details Transparent glass-ceramics containing gahnite Transparent glass-ceramics containing gahnite

1986-09-08

1987-08-18

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 69, C03C 1002, C03C 3085

Patent

active

046877509

ABSTRACT:
This invention relates to the production of highly transparent glass-ceramic articles containing about 30-50% by volume gahnite having dimensions finer than about 300 .ANG. as essentially the sole crystal phase. The articles have compositions essentially free of Li.sub.2 O, Na.sub.2 O, CaO, SrO, and BaO and consist essentially, by weight, of about 1.5-5% R.sub.2 O, consisting of 0-3% K.sub.2 O and/or 0-3% Rb.sub.2 O and/or 0-3% Cs.sub.2 O, 13-22% ZnO, 16-28% Al.sub.2 O.sub.3, 45-65% SiO.sub.2, and 1.5-8% TiO.sub.2.

REFERENCES:
patent: 2920971 (1960-01-01), Stookey
patent: 3460987 (1969-08-01), McMillan et al.
patent: 3681097 (1972-08-01), Beall et al.
patent: 3681102 (1972-08-01), Beall
patent: 3839053 (1974-10-01), Rittler
patent: 3854963 (1974-12-01), Rittler
patent: 3951669 (1976-04-01), Malmendier et al.
patent: 4199340 (1980-04-01), Topping et al.
patent: 4526873 (1985-07-01), Beall et al.

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