Abstract
The solidus surface for the Al2O3-ZrO2-Er2O3 phase is projected for the first time onto the concentration triangle. It consists of five isothermal three-phase fields that correspond to four invariant eutectic equilibria, one invariant transformation equilibrium, and six ruled binary eutectic solidus surfaces. The highest solidus temperature in the system is 2710 °C, which is the melting point of pure ZrO2, and the lowest is 1720°C, which is the melting point of the ternary eutectic AL + F + Er3A5. Neither ternary phases nor visible solid solution areas based on components and binary compounds are found in the system. Based on the data on bounding binary systems, liquidus, and solidus surfaces, the phase equilibrium diagram and reaction scheme for equilibrium crystallization of Al2O3-ZrO2-Er2O3 alloys are constructed.
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