Affiliation:
1. Power and Industrial Systems R&D Center, Toshiba Corporation, 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki, Kanagawa, 210-0862
Abstract
The object of this study is overlay coatings of MCrAlY alloy sprayed by a vacuum plasma spray (VPS) process for the protection against high-temperature corrosion and oxidation in the field of gas turbine components. Reaction diffusion behaviors at the interface between the MCrAlY coatings and the substrate, which have an important effect on coating degradation, have not always been clarified. Three kinds of substrate, equiaxis IN738LC, directional solidified CM247LC and single-crystal CMSX-2, and the four kinds of vacuum plasma sprayed MCrAlY coating have been selected for these experiments. The experimental results showed that the reaction diffusion layers consisted of aluminum compound layer and aluminum depleted layer, excepting that the aluminum depleted layer could not be observed in the case of CoNiCrAlY and NiCoCrAlY coatings. It also indicated that the diffusion thickness could be observed to follow a parabolic time dependence. The order of reaction diffusion rate was NiCrAlY > CoCrAlY > CoNiCrAlY > NiCoCrAlY independent of the substrates. A convenient computer-aided system was developed for analyzing the reaction diffusion behaviors at the interface between coating and substrate. It was also clear that the estimated results of long time diffusion behaviors by simulation analysis was in good agreement with experiments.
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering
Reference17 articles.
1. Bettridge
D. F.
, and UbankR. G., 1986, “Quality Control of High-Temperature Protective Coatings,” Materials Science and Technology, Vol. 2, pp. 232–242.
2. Duvall, D. S., and Ruckle, D. L., 1982, “Ceramic Thermal Barrier Coatings for Turbine Engine Components,” ASME Paper 82-GT-322.
3. Engstrom
A.
, MorralJ. E., and AgrenJ., 1997, “Computer Simulations of Ni-Cr-Al Multiphase Diffusion Couples,” Acta Mater., Vol. 45-3, pp. 1189–1199.
4. Heumann
T.
, 1952, “Zur Berechnung von Diffusions koeffizienten bei Ein- und Mehrphasiger Diffusion in Festen Legierungen,” Zeit. Physik. Chem., Vol. 201, pp. 168–189.
5. Ishiwata, Y., Saitoh, M., and Itoh, Y., 1995, “Coating Design and Evaluation of High-Temperature Strength,” Proceedings, of 1995 Yokohama International Gas Turbine Congress, 95-Yokohama-IGCT-71, pp. 199–106.
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