| 摘要 |
PURPOSE:To produce pyroxene crystallized glass with a simple stage by molding the glass having the specific compsn. consisting essentially of SiO2 and Al2O3 to a prescribed shape and heating and cooling the same. CONSTITUTION:The glass which consists, by wt%, of 50-70% SiO2, 2-7% Al2O3 (60-80% SiO2+Al2O3), 0-10% CaO, 6-15% MgO (10-20% CaO+MgO), 4-15% Na2O, 0-3% Li2O, 0-5% K2O (0-15% Na2O+Li2O+K2O), 0.2-5% TiO2 0-10% ZnO, 0-5% B2O3 and 0-5% P2O5 and having the compsn. consisting of MgO/CaO>2/3 is fused and cleaned up in a melting furnace. Such glass is molded to the prescribed shape at about 1,300 deg.C and the molding is heated to 950-1,050 deg.C. The molding is held at said temp. for 120-240min and is slowly cooled, by which the molding is crystallized and the pyroxene crystallized glass is produced.
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