Abstract
Liquid iron-titanium-oxygen equilibria has been established by equilibrium measurements between liquid iron-titanium alloys and synthesized titanium oxide crucibles and by the thermodynamic data reported previously by the authors.
The results obtained are summerized as follows:
1) It has been shown to be necessary to consider solid solubility of iron into, and nonstoichiometric be-haviour of deoxidation products for the estimation of titanium deoxidation equilibria and activity coefficient of titanium and interaction parameter between titanium and oxygen in liquid iron.
2) Relation between titanium content and deoxidation products has been found to be as follows;
[%Ti]<0.01; titanium oxides (0/Ti=1.7-1.87, [%Fe]<13)
[%Ti] =0.013-0.25; Ti3O3 ([%Fe]<1.2)
[%Ti] =0.25-4.8; Ti2O3
[Ti]>4.8; TiO
Besides, deoxidation products have been found to change its composition in its existing range in 0/Ti ratio and/or iron content corresponding titanium content in liquid iron.
3) Interaction parameters and activity coefficient have been deduced;
e(Ti)O=0.31, e(O)Ti=-0.93, γ0Ti=0.016, e(Ti)Ti=0.042
4) A simplified equation for oxygen solubility is;
log[%O]=-0.60log[Ti%]-3.22, at 1600°C, and 0.013-4.25[%Ti].
