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

DOITrouver le DOI : https://doi.org/10.1007/s11085-015-9604-x
AuteurRechercher : ; Rechercher : ; Rechercher : 1; Rechercher :
Affiliation
  1. Conseil national de recherches Canada. Aérospatiale
FormatTexte, Article
SujetAluminum; 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
Résumé
A 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.
Date de publication
Dans
  • Oxidation of Metals (11 décembre 2015) : 1–18.
Langueanglais
Publications évaluées par des pairsOui
Numéro NPARC21277358
Exporter la noticeExporter en format RIS
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Identificateur de l’enregistrement3cd4d86a-862c-4342-9302-39d82356e66f
Enregistrement créé2016-03-09
Enregistrement modifié2020-04-22

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