Abstract

Abstract In this investigation, commercial Al2O3 and Y2O3 nanopowders were used to produce a composite powder feedstock that was plasma sprayed on graphite substrates. An Al2O3/Y3Al5O12 (YAG) eutectic crystalline structure was expected in the coating due to the high enthalpy, large temperature gradient, and rapid solidification of the plasma spraying process, but microstructure and phase analysis of as-sprayed deposits revealed only a small amount of crystalline grains in an amorphous coating matrix. After heat treating, the expected structure was obtained and found to have excellent microstructure and microhardness stability at high temperatures.

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