| 摘要 |
PURPOSE:To produce a crystallized glass having high strength and good workability, by forming glass powder composed of specific amounts of SiO2, CaO and MgO, heating at a temperature within the glass powder sintering temperature zone and heat-treating at a crystal precipitation temperature. CONSTITUTION:Powder of glass having a particle size of finer than 200 mesh and composed of 40-60(wt)% SiO2, 30-45% CaO and 1-17% MgO (the sum of the main components is >=90wt% of the glass), and containing <=10% impurities selected from Al2O3, B2O3, Na2O, K2O, Li2O, BaO, SrO, ZnO, TiO2, ZrO2, Nb2O3, Ta2O5 and CaF2, is compression molded. The molded glass is heated at a temperature within the glass powder sintering temperature zone, and then heat-treated in a crystal-precipitation temperature zone. A crystallized glass containing a number of dense wollastonite crystals dispersed in the glass matrix as at least one of the precipitated crystals can be produced easily by this process. The obtained glass has high mechanical strength and good machinability and is suitable as an artificial bone, dental material and industrial material.
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