ASSESSMENT OF CALCIUM-OXYGEN EQUILIBRIUM IN LIQUID-IRON

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 1 873 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 -3 600, 5.7 x 10(5) and 2.9 x 10(6) in the range of {[mass% Ca] + 2.51 [mass% O]} <0.005 and -990, 4.2 x 10(4) and 2.1 x 10(5) in the range of {[mass% Ca] + 2.51 [mass% O]} greater-than-or-equal-to 0.005, respectively, and the validity of these values was discussed.