In order to obtain nano-structured ceramics composite coating for high temperature application, pre-mixed Al2O3/Y2O3 powders were plasma-sprayed in this study. Plasma spraying of spray-dried Al2O3/Y2O3 powder resulted in the formation of amorphous coating of metastable Al2O3-Y2O3 solid solution. After the heat treatment, α-Al2O3/YAG nano-structured composite coating was successfully obtained via eutectic reaction between Al2O3 and Y2O3. It was possible to control the sizes of Al2O3 and YAG particles widely by heat treatment with proper condition. Hardness of the coatings showed close relationship with their microstructure.

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