Abstract
The solubility and activity of oxygen in Fe−Al and Fe−Ti melts at 1600°C were measured. The activity was measured electrochemically using the following galvanic cells: Cr-Cr2O3(s) ⋎ ThO2(Y2O3) ⋎ Fe-Al-O(l), Al2O3(s) Cr-Cr2O3(s) ⋎ ThO2(Y2O3) ⋎ Fe-Ti-O(l, saturated with oxide) Cr-Cr2O3(s) ⋎ ZrO2(CaO) ⋎ Fe-Ti-O(l, saturated with oxide) Aluminum and titanium decrease the solubility of oxygen in liquid iron to a minimum of 6 ppm at 0.09 wt pct Al and 40 ppm at 0.9 wt pct Ti, respectively. The value of the interaction coefficients e0(Al) and e0(Ti) are −433 and −222, respectively. the activity coefficient of aluminum at infinite dilution in liquid iron is 0.021, while that of titanium is 0.038. The value of the aluminum equilibrium constant, the solubility product at infinite dilution, is 5.6×10−14 at 1600°C. The ThO2(Y2O3) electrolyte exhibited insignificant electronic conductivity at 1600°C down to oxygen partial pressures of 10−15 atm, which corresponds to about 0.3 ppm O in unalloyed iron.
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