Fe-Cr 용선 내 P의 열역학에 관한 연구

Abstract

Several aspects concerning the thermodynamics of the activity coefficient of phosphorus have been discussed. The phosphate capacity of CaO-SiO2-CaF2 slag has been determined by the present study. The phosphorus distribution ratio has been measured for CaO-SiO2-CaF2 slag. The carbon solubility in Fe-Cr-Csat melts has been measured for the solubility relationship among phosphorus, chromium and carbon. The results indicate that the phosphorus distribution ratio doesn’t change as the chromium content increased. Using Wagner’s interaction parameter formalism, the first- and second-order interaction parameters between Cr and P in liquid iron were determined as a function of temperature given by the following equations.

The thermodynamic relations between chromium and phosphorus were studied by measuring the effect of chromium on phosphorus in Fe-Cr-Csat melts at the temperature range from 1350℃ to 1450℃. The experimental results were thermodynamically analyzed using Wagner’s interaction parameter formalism to determine the first- and the second-order interaction parameters between chromium and phosphorus in Fe-Cr-Csat melts containing up to 25mass% Cr as follows. The Estimations were carried out using two types of the activity coefficient of phosphorus as discussed.