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

All available thermodynamic data and phase diagram data in the Al₂O₃–ZrO₂, CaO–Al₂O₃–ZrO₂, and Al₂O₃–SiO₂–ZrO₂ 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 Al₂O₃ and ZrO₂, key phase diagram experiments in the Al₂O₃–ZrO₂ 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 Al₂O₃–ZrO₂, CaO–Al₂O₃–ZrO₂, and Al₂O₃–SiO₂–ZrO₂ systems are well reproduced, and unknown phase diagram and thermodynamic properties are predicted.