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

: Fabrichnaya, O.; Pavlyuchkov, D.; Neher, R.; Herrmann, M.; Seifert, H.J.


Journal of the European Ceramic Society 33 (2013), No.13-14, pp.2457-2463
ISSN: 0955-2219
Journal Article
Fraunhofer IKTS ()
alumina; aluminium nitride; CALPHAD method; phase diagram; Yttria

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.