Liquid phase formation in the system Al2O3-Y2O3-AlN. Pt.II: Thermodynamic assessment

The mixing parameters of liquid phase in the Al2O3-Y2O3-AlN system were assessed based on differential thermal analysis (DTA) and scanning electron microscopy combined with energy dispersive X-ray spectroscopy (SEM/EDX) investigations of selected compositions. Phase diagram of the Y2O3-AlN system was calculated. Liquidus surface of the Al2O3-Y2O3-AlN system was constructed and compared with experimental results on primary crystallisation fields. Calculated temperatures of invariant reactions were in agreement with DTA results. Vertical sections of the Al2O3-Y2O3-AlN system were calculated and compared with experimental data.