Effect of supersonic fine particles bombarding on oxidation behavior of MCrAlY coating

MCrAlY bonding coating was deposited on GH99 high-temperature alloy using atmospheric plasma spraying(APS). The influence of supersonic fine particles bombarding on microstructure and thermally grown oxide of MCrAlY coating was investigated, and the interface, phase constituents and the evolution of the coating exposed at 1 100℃ for different times was evaluated by SEM, XRD and glow discharge spectroscopy.The experimental results showed that the oxide particles were fine through supersonic treating, then Al₂O₃ scale formed quickly onMCrAlY surface, and Ni and Cr were prevented from oxidizing.For this reason, the formation of Ni(Cr,Al)₂O₄ can be avoided and flaw decreases, so that the high-temperature oxidation resistance of coating is improved.