単結晶Ni基超合金の高温耐食耐酸化コーティング設計の基礎研究

概要

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A computer-aided interactive system for coating desing has been developed, which enables to analyze coveniently the reaction diffusion of bonded materials. The object of this study is the overlay coatings of MCrAlY alloy sprayed by a low-pressure-plasma spray (LPPS) process for protection against high-temperature corrosion and oxidation in the Geld of gas turbine components. However, the reaction diffusion behavior at the interface between the MCrAlY coating and the substrate, which has an important effect on coating degradation, has not been fully clarified. Four kinds of low-pressure-plasma sprayed MCrAlY alloys, namely CoCrAlY, NiCrAlY, CoNiCrAIY and NiCoCrAlY, and single-rystal CMSX-2 were selected for the experiments. The experimental results showed that the reaction diffusion layers consisted of aluminum compound layer and low aluminum layer. In case of the NiCoCrAlY and CoNiCrAlY coatings, the aluminum compound layer could not be observed clearly. It was also indicated that each diffusion thickness could be expressed by the parabolic time dependence. The order of reaction diffusion rate was NiCrAlY > CoCrAlY > CoNiCrAlY > NiCoCrAlY. It was also clarified by the simulation analysis that the diffusion distance during heating process can not be ignored in comparison with the total diffsion distance, and the estimation of long time diffusion was made.
社団法人日本材料学会の論文
1997-06-15