Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1999-04-05
2000-10-10
Group, Karl
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
501 4, 501 5, 65 333, C03C 1016
Patent
active
061301787
ABSTRACT:
The present invention is directed at a glass-ceramic having high strength and toughness and containing miserite as a predominant crystal phase. The glass-ceramic has a composition calculated in terms of a weight percent on the oxide basis comprising 40-68% SiO.sub.2, 12-35% CaO, 8-20% CaF.sub.2, 4-10.5% K.sub.2 O, 0-5% Al.sub.2 O.sub.3, 0-5% B.sub.2 O.sub.3, 0-15% P.sub.2 O.sub.5, 0-4% R.sub.2 O.sub.3, wherein R represents Y.sup.3+ and rare earth metals in the lanthanide series, and 0-5% of optional constituents selected from the group consisting of MgO, SrO, BaO, Na.sub.2 O, Nb.sub.2 O.sub.5, ZrO.sub.2, and ZnO, and 0-10% of optional constituents selected from the group consisting of Nb.sub.2 O.sub.5 and TiO.sub.2 and 0-2% Li.sub.2 O as an optional constituent. The glass-ceramic may contain secondary phases of cristobalite (SiO.sub.2), fluorite (CaF.sub.2), xonotlite (Ca.sub.6 Si.sub.6 O.sub.17 F.sub.2), and fluorapatite (Ca.sub.5 (PO.sub.4).sub.3 F), and small amounts of other calcium silicate phases such as wollastonite (CaSiO.sub.3).
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Andrus Ronald L.
Beall George H.
Pinckney Linda R.
Wolcott Christine C.
Corning Incorporated
Gheorghiu Anca C.
Group Karl
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