Glass-ceramics and color methods

Details Glass-ceramics and color methods Glass-ceramics and color methods

1992-07-24

1993-10-26

Group, Karl

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 69, 501 71, C03L 1014

Patent

active

052566005

ABSTRACT:
A method of varying the color in a glass-ceramic material having a beta-quartz solid solution as the predominant crystal phase which comprises controlling the Al.sub.2 O.sub.3 level between 19 and 20% by weight, the Fe.sub.2 O.sub.3 level between 700 and 900 ppm and the Co.sub.3 O.sub.4 level between not over 15 ppm and 140 ppm. An amber color is obtained with 20-40 ppm Co.sub.3 O.sub.4 and a burgundy color with 120-140 ppm Co.sub.3 O.sub.4. Co.sub.3 O.sub.4 in a compatible carrier may be added to molten glass as a forehearth additive.

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patent: 4940674 (1990-07-01), Beall et al.
patent: 5070043 (1991-12-01), Amundson, Jr. et al.
patent: 5070045 (1991-12-01), Comte et al.
patent: 5179045 (1993-01-01), Aitken et al.

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