Effects of Cr–Si diffusion barrier layer on the oxidation resistance of NiCrAlY coating system with aluminized top layer

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DOIResolve DOI: http://doi.org/10.1007/s11085-015-9604-x
AuthorSearch for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleOxidation of Metals
ISSN0030-770X
Pages118; # of pages: 18
SubjectAluminum; Aluminum coatings; Coatings; Diffusion; Diffusion coatings; Multilayers; Oxidation; Oxidation resistance; Plasma spraying; Silicon; Co-deposited layer; Inward diffusion; Multi-layer-coating; NiCrAlY coating; Plasma sprayed; Si diffusion; Si layer; Spallation resistance; Diffusion barriers
AbstractA multilayer coating, which consisted of a Cr–Si co-deposited layer as the diffusion barrier, a plasma sprayed NiCrAlY middle layer, and an aluminized top layer, was developed. During the aluminizing treatment, Cr in the NiCrAlY layer was released as the γ/γ′ structure of this layer transformed to the β phase. The released Cr was inhibited by the inner Cr–Si layer to diffuse into the substrate, and a Cr layer eventually formed over the Cr–Si layer. The Cr layer impeded the inward diffusion of Al due to the low solubility of Al in the Cr layer so that more Al atoms remain in the coating and contributed to the oxidation resistance of the coating. The multilayer coating exhibited better oxidation and spallation resistance than coatings without a Cr–Si layer, at least at 1050 °C for up to 1000 h.
Publication date
PublisherSpringer International Publishing
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace
Peer reviewedYes
NPARC number21277358
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Record identifier3cd4d86a-862c-4342-9302-39d82356e66f
Record created2016-03-09
Record modified2016-05-09
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