Solidus surface and phase equilibria for the Al{sub}2O{sub}3-ZrO{sub}2-La{sub}2O{sub}3 phase diagram alloys crystallization

摘要

A projection of the solidus surface for the Al{sub}2O{sub}3-ZrO{sub}2-La{sub}2O{sub}3 phase diagram was constructed for the first time. It consists of seven isothermal three-phase areas, which correspond to three invariant eutectic-type equilibria and four invariant peritectic-type equilibria, as well as of four linear surfaces for the end of binary eutectics crystallization. The highest temperature on the solidus surface is 2710 ℃, the lowest one is 1665℃. No ternary phases and appreciable solid solution areas were found. The diagram of phase equilibrium and the equilibrium alloy crystllization scheme for the Al{sub}2O{sub}3-ZrO{sub}2-La{sub}2O{sub}3 system were constructed from the data on bounding binary systems and liquidus and solidus surfaces.