Thermodynamic Modeling of the Al2O3-Ti2O3-TiO2 System and Its Applications to the Fe-Al-Ti-O Inclusion Diagram

All available thermodynamic and phase diagram data have been critically evaluated and optimized for the liquid slag phase and for all solid phases at 1 bar pressure from 298 K to above the liquidus temperatures for the systems Al2O3-TiO2, Al2O3-Ti2O3, and Al2O3-Ti2O3-TiO2, and a database of model parameters has been prepared. The Modified Quasichemical Model was employed for the molten oxide phase. The thermodynamic modeling predicts the existence of a liquid oxide Al2O3-Ti2O3-TiO2 phase at secondary steelmaking conditions. The database was used to calculate the inclusion diagram for Al-Ti deoxidation at 1600 degrees C.