Equilibrium between Aluminum and Oxygen in Fe-36%Ni Alloy and Liquid Iron at 1973K

Abstract

The deoxidation equilibrium for aluminum in liquid iron and Fe-36%Ni alloy were carried out under pressure controlled H₂/H₂O gas at 1973K.
Within the composition range of [%O]<0.008 and [%Al]<0.018, the values for the interaction parameter between aluminum and oxygen in liquid iron and Fe-36%Ni alloy were determined as -9.5±5.9 and -26.2±8.7, respectively. The values of the equilibrium constant for the deoxidation reaction:
Al₂O₃(s)=2Al(1 wt% in metal)+3O(1 wt% in metal)
for liquid iron and Fe-36%Ni alloy were obtained to be -12.5±0.3 and -12.6±0.3 in logarithmic scale, respectively.