Formation of inter-diffusion layer between NiCrAlY coating and Nb substrate during vacuum heat-treatment

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DOIResolve DOI: http://doi.org/10.2320/matertrans.M2014350
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TypeArticle
Journal titleMaterials Transactions
ISSN1345-9678
Volume56
Issue3
Pages367371; # of pages: 5
SubjectCathodes; Coatings; Deposition; Diffusion; Electrodes; Heat treatment; Nickel; Solid solutions; Arc deposition; NbCr2(HT) phase; NbNi<sub>3</sub> phase; Nickel chromium; Vacuum heat treatment; Diffusion coatings
AbstractThe formation of the inter-diffusion layer between NiCrAlY coating and Nb substrate during vacuum heat treatment was investigated. A NiCrAlY coating was applied on Nb substrate by cathode arc deposition. Vacuum heat treatments were carried out at 800, 900, and 1000°C for 2 h. SEM, EPMA, EDS, and XRD were performed to analyze the microstructure of the inter-diffusion layer and the results were interpreted using the 1002°C isothermal ternary Nb-Ni-Cr phase diagram. It was found that at 800°C the inter-diffusion layer has a single NbNi3 layer; at 900°C the inter-diffusion layer consists of an outer NbNi3 layer, a thin intermediate NbCr2(HT) layer, and an inner Nb7Ni6 layer; at 1000°C the interdiffusion layer has three well-developed layers of an outer NbNi3 layer, an inner Nb7Ni6 layer, and an intermediate layers comprising NbCr2(HT) and NbNi3. A small amount of Cr exists in both the NbNi3 and the Nb7Ni6 phases as solid solution, and a large amount of Ni in the NbCr2(HT) phase as solid solution.
Publication date
PublisherThe Japan Institute of Metals and Materials
LanguageEnglish
AffiliationNational Research Council Canada; Aerospace
Peer reviewedYes
NPARC number21275673
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Record identifier1fba46ee-b0c6-4326-aa4a-ab856ce7812d
Record created2015-07-14
Record modified2016-05-09
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