Liquidus surface for the Al₂O₃―TiO₂―Y₂O₃ phase diagram

Abstract

The liquidus surface of the Al₂O₃―TiO₂―Y₂O₃ phase diagram is constructed of the first time. The liquidus surface is consists there are eleven fields of primary crystallization of the phases of TiO₂, H-, C-crystalline modifications Y₂O₃ and α-AT, β-AT, AL, YT₂, F, Y₃A₅, YA and Y₂A phases. Six four-phase invariant eutectic equilibria, one four-phase invariant transformation equilibrium, and five threephase invariant eutectic equilibria are found. The maximum temperature on the surface of the liquidus in the system studied is 2440 ºC and it corresponds to the melting point of Y₂O₃ compound. The minimum temperature on the surface of the liquidus in the system is 1550 °C and it corresponds to three-phase eutectic Е₆.