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

Abstract

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°C.