| 摘要 |
The instant invention is directed to the production of highly crystalline glass-ceramic articles demonstrating high intrinsic mechanical strength and toughness containing crystals of canasite and/or agrellite and/or fedorite as the predominant crystal phase. The articles have overall compositions consisting essentially, expressed in terms of weight percent on the oxide basis, of about -SiO2 45-75 -CaO 8-30 -F 3.5-12 -Na2O 3-15 -K2O 0-20 -Na2O + K2O 5-25 -B2O3 0-6 -Al2O3 0-7 -ZrO2 0-12. -
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