Equilibrium between Titanium and Oxygen in Liquid Fe-Ti Alloy Coexisted with Titanium Oxides at 1873K

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The equilibrium between Ti and O has been investigated in molten Fe–Ti alloy saturated with various kinds of titanium oxides at 1873 K. The present results have been thermodynamically analyzed applying Wagners formalism as well as Darkens quadratic formalism with the excess Gibbs free energy change of mixing described by Redlich–Kister type polynomial. The equilibrium constants and the interaction parameters of Wagners formalism were given as follows at 1873 K in the present work.Ti2O3(s)=2Ti+3O (0.5<mass%Ti<6.2)log K=−10.17, eOTi=−0.34‘Ti3O5’(s)=3Ti+5O (0.0004<mass%Ti<0.36)log K=−16.86, eOTi=−0.34The Henry constant of Ti in liquid Fe–Ti alloy was assessed as follows at 1873 K.γ°Ti(l)=0.0090The interaction parameters of Redlich-Kister type polynomial for molten Fe–Ti–O alloy were given by the following values at 1 873 K in the present work.0ΩFe–Ti=−73360/J0ΩTi–O=−1035900/JThe estimated results based on Wagners formalism as well as Darkens quadratic formalism polynomials were well agreed with the experimental results which were observed between Ti and O equilibrium contents in molten Fe–Ti alloy.
社団法人日本鉄鋼協会の論文
2006-07-15