Reaction diffusion behaviors for interface between Ni-based super alloys and vacuum plasma sprayed MCrAlY coatings

Journal Article · Thu Jul 01 04:00:00 EDT 1999 · Journal of Engineering for Gas Turbines and Power

DOI:https://doi.org/10.1115/1.2818497· OSTI ID:678026

Itoh, Y; Tamura, M ^[1]

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1. Toshiba Corp., Kawasaki, Kanagawa (Japan)

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, expecting 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.

• Sponsoring Organization: USDOE
• OSTI ID: 678026
• Journal Information: Journal of Engineering for Gas Turbines and Power, Journal Name: Journal of Engineering for Gas Turbines and Power Journal Issue: 3 Vol. 121; ISSN JETPEZ; ISSN 0742-4795
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
COBALT BASE ALLOYS
CORROSION PROTECTION
GAS TURBINES
HEAT RESISTING ALLOYS
INTERFACES
IRON BASE ALLOYS
NICKEL BASE ALLOYS
SPRAYED COATINGS
YTTRIUM ALLOYS