Assessment of thermodynamic parameters in the system ZrO₂–Y₂O₃–Al₂O₃

Abstract

Abstract The thermodynamic parameters have been assessed for the systems of ZrO2–Y2O3, ZrO2 –Al2O3 and ZrO2–Y2O3–Al2O3 using the Calphad technique. The solid solutions are described by the compound energy formalism. A two-sublattice ionic liquid model is used to describe the liquid phase. The phase diagrams of the ZrO2–Y2O3 and ZrO2–Al2O3 and Y2O3–Al2O3 systems are in fairly good agreement with phase equilibrium data. Isothermal sections of the phase diagram of the ZrO2–Y2O3–Al2O3 system at subsolidus conditions are calculated. Introducing ternary interactions in the liquid phase results in a better fit to experimental data of the liquidus surface and isoplethal sections.