| 摘要 |
<p>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 45-15 CAO 8-30 F 3.5-12 Na2O 3-15 K2O 0-20 NA2O + K2O 5-25 B2O3 0-6 A12O3 0-7 ZrO2 0-12</p> |
