The liquidus surface on the Al2O3–HfO2–Y2O3 phase diagram is constructed for the first time. No ternary compounds and appreciable solid solution regions based on components and binary compounds are found in the ternary system. The liquidus surface is completed by eight primary crystallization fields. Four four-phase invariant eutectic equilibria, one four-phase invariant transformation equilibrium, and three three-phase invariant eutectic equilibria are found. Since HfO2 interacts with other phases eutectically, the materials combine the unique properties of HfO2-based T and F phases with the properties of other phases in the Al2O3–HfO2–Y2O3 system.
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Translated from Poroshkovaya Metallurgiya, Vol. 48, 11–12 (470), pp. 103–111, 2009.
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Lakiza, S.M., Tishchenko, Y.S., Sus, A.O. et al. The Al2O3–HfO2–Y2O3 phase diagram. II. Liquidus surface. Powder Metall Met Ceram 48, 693–699 (2009). https://doi.org/10.1007/s11106-010-9187-7
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DOI: https://doi.org/10.1007/s11106-010-9187-7