| 摘要 |
PURPOSE:To improve strength by sintering Al2O3-SiO2 ceramics contg. impurities such as Na2O and K2O regulated to a very small amt. basing on the total amt. of Al2O3 and SiO2 and reheating the sintered body. CONSTITUTION:Powdery starting material consisting of 60-71.8wt.% Al2O3, 40-28.2wt.% SiO2 and (<=2,500ppm, in total, of impurities such as Na2O and K2O is calcined, pulverized, molded and sintered at 1,500-1,700 deg.C in the air. This sintered body is reheated at 1,500 deg.C for 4-96hr to obtain Al2O3-SiO2 ceramics having improved strength at ordinary temp. and high temp. of <=1,300 deg.C. |
