Silicon-Oxygen Equilibrium in Liquid Iron

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Abstract
The equilibrium of silicon and oxygen dissolved in liquid iron was studied at temperatures of 1570°C, 1625°C and 1680°C respectively. Fe-Si alloys were melted in pure silica crucibles in the H2-H2O gas mixtures for 10-20h. Silicon in liquid iron increased its activity coefficient even with a low-silicon concentration, while it reduced the activity coefficient of oxygen. The products of silicon and oxygen were nearly constant in the range of 0-3.0% silicon. These data obtained were summarized as follows: 3. The interaction parameter of silicon in liquid iron, e'Si: 4. The effect of silicon on the activity coefficient of oxygen in liquid iron, e(Si)0: 5. The activity coefficient of silicon in liquid iron with a very low silicon concentration (in mole-fraction), γ°Si:

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