Equilibrium between Carbon and Oxygen in Liquid Iron and Carbon-Monoxide under High Pressure

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The oxygen content in liquid iron containing 1〜3 %C and in equilibrium with carbon-monoxide at 16, 8, 4 and 1 atm. was studied at 1, 500℃, and the following results were obtained : (1) When K_1' (=P_<CO>/%C×%C) is calculated from the analytical value of oxygen which is determined by vacuum fusion method, the dependence of K_1' on %C varies with P_<CO>; that is, when P_<CO>=1 atm., K_1' is almost constant in the present range of carbon concentration. On the other hand, in the case of P_<CO>=16 atm., K_1' increases with increasing %C. (2) These circumstances are considered to be due to some systematic errors in the analytical values of oxygen. The error amounts to 5〜10 ppm, and is considered to originate from oxide film on the surface of specimen. (3) After the correction for the systematic error, the values of K_1' are 1, 700 and 3, 000 at 2 and 3 %C, respectively, which are larger than the value of about 500 in a low carbon melt by other workers. (4) The activity coefficient of oxygen in the liquid iron, f_O, increases with increasing carbon concentration corresponding to e_O^<(C)>=0.05.
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