| 摘要 |
The instant invention is directed toward the production of an alkali metal-free glass-ceramic body wherein the predominant, and preferably sole, crystal phase is a calcium fluorophlogopite. The body is strong, chemically durable, exhibits excellent electrical properties, and has a base composition consisting essentially, expressed in weight percent on the oxide basis, of about CaO: 5-20 MgO: 15-25 Al2O3: 5-20 SiO2: 35-60 F: 5-15 which is nucleated with 0.5-3.5% BaO+SrO, consisting of 0-3.5% BaO and 0-2.5% SrO, or, if BaO and/or SrO are absent, with 8-15% TiO2. The preferred products exhibit a white, translucent appearance and excellent resistance to staining.
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