Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1991-10-07
1993-06-15
Group, Karl
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
501 7, 501 63, 501 68, 501 69, 501 70, 501 71, C03C 1004
Patent
active
052197999
ABSTRACT:
This invention relates to glass-ceramic articles containing lithium disilicate crystals as the predominant crystal phase and consisting essentially, in weight percent, of 8-19% Li.sub.2 O, 0-5% Na.sub.2 O, 0-7% K.sub.2 O, 0-8% Na.sub.2 O+K.sub.2 O, 0-10% CaO, 0-6% SrO, 0-6% BaO, 2-12% Na.sub.2 O+K.sub.2 O+CaO+SrO+BaO, 0-7% ZnO, 0-11% Al.sub.2 O.sub.3, 1.5-11% ZnO+Al.sub.2 O.sub.3, with a molar ratio (Na.sub.2 O+K.sub.2 O) (ZnO+Al.sub.2 O.sub.3) between 0.075-1.25, 65-80% SiO.sub.2, and as a nucleating agent 1.5-7% P.sub.2 O.sub.5 and/or 0.0001-0.1% Pd. Glass-ceramics having certain compositions within those ranges are self-glazing.
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Beall George H.
Echeverria Lina M.
Morrissey Joseph W.
Pierson Joseph E.
Corning Incorporated
Group Karl
Janes, Jr. C. S.
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