Thermodynamic assessment of the Al2O3–ZrO2, CaO–Al2O3–ZrO2, and Al2O3–SiO2–ZrO2 systems

All available thermodynamic data and phase diagram data in the Al 2 O 3 –ZrO 2 , CaO–Al 2 O 3 –ZrO 2 , and Al 2 O 3 –SiO 2 –ZrO 2 systems at 1 bar total pressure were critically evaluated and assessed simultaneously to obtain a set of the optimized Gibbs energies of all phases in the systems. Due to the lack of reliable data on the mutual solubility of Al 2 O 3 and ZrO 2 , key phase diagram experiments in the Al 2 O 3 –ZrO 2 binary system were carried out by using a classical phase equilibrium and quenching technique followed by the EPMA phase analysis. Based on the optimized Gibbs energies, the reliable experimental phase diagram and thermodynamic property data of the Al 2 O 3 –ZrO 2 , CaO–Al 2 O 3 –ZrO 2 , and Al 2 O 3 –SiO 2 –ZrO 2 systems are well reproduced, and unknown phase diagram and thermodynamic properties are predicted.