Phase diagram study and thermodynamic modeling of the Na₂O–Al₂O₃–ZrO₂ system

Abstract

The phase diagram of the Na2O‐Al2O3‐ZrO2 system was experimentally studied at 1500 to 1650°C by a classical equilibration/quenching method and differential thermal analysis (DTA) followed by X‐ray diffraction (XRD) phase analysis and electron probe micro‐analysis (EPMA). Sealed Pt crucible was utilized to prevent the volatile loss of Na2O during high temperature phase equilibrium experiments and the hydration upon quenching. The phase diagram of the Na2O‐Al2O3‐ZrO2 system was revealed for the first time. Based on the present experimental data and available binary modeling results in literature, the thermodynamic modeling of the ternary system was performed using the CALculation of PHAse Diagram (CALPHAD) method and the phase diagram of the entire the Na2O‐Al2O3‐ZrO2 system was constructed and the optimized thermodynamic properties for all solids and liquid phase within the ternary system were obtained.This article is protected by copyright. All rights reserved