| 摘要 |
PURPOSE:To obtain a sintered soft porcelain body which has elegant translucency and is whitish at low cost by sintering a molded body which has composition incorporating SiC2, Al2O3, CaO, P2O5, K2O, Fe2O3 and TiO2, etc., at the specified weight ratio at prescribed temp. in the oxidative atmosphere. CONSTITUTION:Raw materials such as feldspar, limestone, clay, kaolin, sericite and silica stone are mixed. A mixture is produced which has composition of by weight % 55-48% SiO2, 25-20% Al2O3, 18-12% CaO, 9-5% P2O5, 4-2% K2O and 2-0.1% (Na2O+MgO), 1-0.2% Fe2O3 and 0.7-1% TiO2 which are the impurities mixed from the used raw materials. Then a sintered soft porcelain body incorporating gray feldspar as main constitutional mineral is obtained by grinding, kneading and molding the mixture and thereafter sintering this molded body at 1150-1250 deg.C sintering temp. in the oxidative atmosphere. Thereby this sintered soft porcelain body can be produced at low cost industrially and easily because bone ash, etc., expensive in a price are not utilized. |
