Critical evaluation and thermodynamic assessment of the Al2O3-TiO2-CaO ternary system

Knowledge about the thermodynamic equilibria of the Al2O3-TiO2-CaO system is important for the design of refractory and ceramic materials. The Al2O3-TiO2, Al2O3-CaO nd CaO-TiO2 binary systems were reoptimized and the Al2O3-TiO2-CaO ternary system was assessed by CALPHAD (CAlculation of PHAse Diagram) approach due to the reliability of phase diagram and thermodynamic property data. The liquid phase was described by the ionic two-sublattice model with the formula (Al+3,Ti+2,Ti+3,Ca+2)P(O- ,AlO 1.5 ,Va,O,TiO 2 ) Q . A set of self- consistent thermodynamic parameters for the Al2O3-TiO2-CaO ternary system was finally obtained, reproducing well the phase diagram and thermodynamic properties, predicting the Ca4Ti3O10 primary crystallization field. The present thermodynamic description is of interest for the design of refractory and ceramic materials as well as the development of thermodynamic databases for multicomponent aluminosilicate system.