Assessment of Calcium-Oxygen Equilibrium in Liquid Iron

Abstract

The first-order (e_O^Ca) and the second-order (r_O^Ca, r_O^{Ca, O}) interaction parameters between calcium and oxygen in liquid iron were determined at 1873 K by using the previous data obtained in slag-metal equilibrium experiments, on the basis of the reciprocal and conversion relationships between mass percent and mole fraction scales. The Values for e_O^Ca, r_O^Ca and r_O^{Ca, O} were obtained as -3600, 5.7×10⁵ and 2.9×10⁶ in the range of {[mass%Ca]+2.51[mass%O]}<0.005 and -990, 4.2×10⁴ and 2.1×10⁶ in the range of {[mass%Ca]+2.51[mass%O]}≥0.005, respectively, and the validity of these values was discussed.