Isothermal oxidation behaviour of a gradient NiCoCrAlSiY coating deposited by arc ion plating on a Ni-based single crystal superalloy
C.Z. Xu, S.M. Jiang, Z.B. Bao, J. Gong, C. Sun
Corrosion Science
A gradient NiCoCrAlSiY coating consisting of Al-enriched outer zone and Cr-enriched internal zone was prepared using arc ion plating method and subsequent annealing treatment. Isothermal oxidations were performed at 1000 C and 1100 C in static air. The results confirmed an enhanced performance for the gradient NiCoCrAlSiY coating in contrast to the conventional NiCoCrAlSiY, due to the high-Al content and the in-situ Cr(Re, W)-rich diffusion barrier which exists in the gradient coating. The degradation mechanisms for the two coatings and the formation mechanism for the diffusion barrier are discussed.
Keywords:
Metal coatings , Superalloy ,SEM , Oxidation
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