Abstract
Calcium-oxygen and magnesium-oxygen equilibria in liquid iron saturated with CaO-SiO2-Al2O3-MgO slags were studied at 1873 K using CaO, Al2O3, and MgO crucibles. The applicability of the first-order and second-order interaction coefficients between Ca and O and between Mg and O was studied by comparing the Ca-O and Mg-O equilibria observed in the present and previous experiments with the calculated ones from the respective interaction coefficients. As a result, the interaction coefficients obtained in the present work by using a new method were found to explain the measured solubilities of CaO and MgO. The phase stability region in Fe-Al-M (M=Ca, Mg)-O system was described at 1873 K.
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