| 摘要 |
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% SiO2, 12-35% CaO, 8-20% CaF2, 4-10.5% K2O, 0-5% Al2O3, 0-5% B2O3, 0-15% P2O5, 0-4% R2O3, wherein R represents Y3+ and rare earth metals in the lanthanide series, and 0-5% of optional constituents selected from the group consisting of MgO, SrO, BaO, Na2O, Nb2O5, ZrO2, and ZnO, and 0-10% of optional constituents selected from the group consisting of Nb2O5 and TiO2 and 0-2% Li2O as an optional constituent. The glass-ceramic may contain secondary phases of cristobalite (SiO2), fluorite (CaF2), xonotlite (Ca6Si6O17F2), and fluorapatite (Ca5(PO4)3F), and small amounts of other calcium silicate phases such as wollastonite (CaSiO3).
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