溶鉄中の硫黄と酸素の活量

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The equilibria of reactions between liquid iron and H_2S-H_2O-H_2-Ar gas mixture were examined using a resistance furnace in order to make clear the interaction between sulphur and oxygen in liquid iron. The gas mixture was sufficiently preheated by adjusting its total flow rate, and hence thermal diffusion was avoided. Soundly solidified specimens were obtained when the gas mixture was diluted with argon. However, adding too much of argon and water vapor decreased the values of P_<H_2S>/P_<H_2> thermodynamically calculated. Therefore, experiments were performed on the basis of the condition, under which H_2S-H_2-Ar gas mixture was in thermal equilibrium. As a fundamental study, measurements were carried out for liquid iron equilibrated with H_2S-H_2 and H_2O-H_2 gas mixtures using the same resistance furnace. The interaction parameters e^<(S)>_O and e^<(O)>_S at 1500, 1550 and 1600℃ were obtained by combining the results for Fe-O-S system with those obtained in the present study for both Fe-O and Fe-S systems.
社団法人日本鉄鋼協会の論文
1982-09-01