Nano-dispersed α-Al2O3/YAG composite coatings were successfully obtained by plasma spraying of the granulated Al2O3/Y2O3 powder, and the post heat treatment. The as-sprayed coating was composed of an amorphous phase, metastable Y-Al-O solid solution. After the heat treatment around 1473K, two crystalline phases, α-Al2O3 and YAG, precipitated, so that the fine dispersed Al2O3/YAG composite coatings were formed. The sizes of the precipitates could be widely controlled by time and temperature of the heat treatment. Hardness and wear property were evaluated in this nano-structured CMC coating.

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