2005•Acta Scientiarum Naturalium Universitatis SunyatseniRequires access

Oxidation protection of NiCoCrAIY coatings on γ-TiAl

王启民, 郭明虎, Peiling Ke, Gong Jun, 孙超, 闻立时

Abstract

Abstract: The effect of NiCoCrAlY overlay coatings on the oxidation resistance of γ-TiAl was studied at 900℃ in static air. To hinder the interdiffusion of the elements, the Al/Al2 O3 layer was added between the coating and the alloy. The results show that the TiAl alloy exhibits poor oxidation resistance. NiCoCrAlY coating can not effectively protect the γ-TiAl substrate from high temperature oxidation because of the serious interdiffusion between the coating and the substrates. With Al/Al2O3 diffusion barrier, the NiCoCrAlY coating exhibits excellent oxidation protection on γ-TiAl alloy.

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Key concepts: Materials science, Coating, Alloy, Metallurgy, Diffusion barrier, Layer (electronics), Diffusion, Substrate (aquarium)