Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1991-01-28
1991-12-03
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
C03C 1016
Patent
active
050700448
ABSTRACT:
The instant invention is directed to the production of opaque glass-ceramic articles containing canasite crystals as the predominate crystal phase exhibiting strong bright colors. The desired color is obtained through the addition of a colorant system to the precursor glass composition utilized for the production the canasite glass-ceramic.
Opaque glass ceramic articles exhibiting bright colors ranging from purple-to-blue-to-green are obtained through the addition of a colorant system consisting essentially, expressed in weight percent, of about 0.02%-1.5% total of at least one member selected from the group consisting of Cr.sub.2 O.sub.3 and Co.sub.3 O.sub.4, with the maximum amount of either member being about 1.0%.
Another embodiment is directed towards the production of opaque glass-ceramic articles exhibiting strong bright colors yellow-to-orange-to-red-to-brown colors. The desired color is obtained through the addition, under mildly reducing conditions, of a colorant system consisting essentially, expressed in weight percent, of about 0.1%-1.0% of at least one member selected from the group consisting of CdS, Se and CdO, with the maximum presence of each member being about 1.5%.
A final embodiment is directed towards the production of opaque glass-ceramic articles exhibiting a strong bright black coloration. The desired color is obtained through the addition, under reducing conditions of a colorant system consisting essentially of about 0.01%-1.0% of NiO.
REFERENCES:
patent: 4386162 (1983-05-01), Beall
Bell Mark L.
Corning Incorporated
Janes Jr. Clinton S.
Schaeberle Timothy M.
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