低酸素分圧下での赤色粘土の焼成時における酸素の放出と鉄の化学状態変化

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  • Oxygen Evolution and Chemical State Changes of Iron during Firing of Red Clay Bodies at Low Oxygen Pressure.

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A red clay body containing 7mass% Fe2O3 was fired at PO2=0.1kPa and its bloating and blackening mechanisms were investigated.<br>Blackening started at around 1100°C and the Fe2+/total Fe ratio in the fired body was about 5%. The disappearance of open pores started at about 1200°C, and the sealed porosity began to increase above 1200°C. The Fe2+/total Fe ratio in the body fired at 1200°C was 16%, indicating that a considerable amount of oxygen had been released. Although the evolution of oxygen started at around 1100°C as judged from the results of chemical analysis of Fe, the evolution of oxygen was detected only at around 1080°C and at the soaking temperatures probably due to the high heating rate (5°C/min).<br>The results of thermodynamic calculations suggested that oxygen evolution was caused or at least assisted by the reaction of iron oxides with Al2O3 to form FeAl2O4, a stable spinel. It is, however, assumed that FeAl2O4 reacted with silicate compounds during sintering at high temperatures.

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