カルシウムフェライトの水熱合成
1975 年 91 巻 1043 号 p. 1-4
詳細
1975 年 91 巻 1043 号 p. 1-4
Phase relations in the CaO-Fe2O3-(FeO)-H2O system are investigated between 200°C and 700°C, and under water pressures of 100atrn, 300atm and 1, 000atm. The assemblage of Ca (OH) 2 and iron oxide (s) is stable under the water pressure of 1, 000atm and/or between200ºC and 500°C. CaO·Fe2O3 is stable above 600°C and below 300atm Only under 100atm, 2CaO·Fe2O3 and 4 CaO·FeO·4Fe2O3 are stable at 700°C and above 600°C, respectively. These results suggestthat calcium ferrites, which are important in the self-fluxed sinter, can be formed at lower temperatures under the hydrothermalcondition than in air.
