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

Download
  1. Get@NRC: Formation of inter-diffusion layer between NiCrAlY coating and Nb substrate during vacuum heat-treatment (Opens in a new window)
DOIResolve DOI: http://doi.org/10.2320/jinstmet.J2014017
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
ISSN0021-4876
Volume78
Issue9
Pages359363; # of pages: 5
SubjectCathodes; Deposition; Diffusion; Diffusion coatings; Nickel; Solid solutions; Arc deposition; NbCr<sub>2</sub>(HT) phase; NbNi<sub>3</sub> phase; Nickel chromium; Vacuum heat treatment; Heat treatment
AbstractThe formation of the inter-diffusion zone (IDZ) 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°C, 900°Cand 1000°C for 2 h. SEM, EPMA, EDS and XRD were performed to analyze the microstructure of the IDZ and the results were interpreted using the 1002°C isothermal ternary Nb-Ni-Cr phase diagram. It was found that at 800°C the IDZ has a single NbNi3layer; at 900°C the IDZ consists of an outer NbNi3layer, a thin intermediate NbCr2(HT) layer and an inner Nb7Ni6 layer; at 1000°C the IDZ has three well-developed layers: an outer NbNi3layer, an intermediate NbCr2(HT) layer and an inner Nb7Ni6 layer. A small amount of Cr exists in both NbNi3and Nb7Ni6phases as solid solution, and a large amount of Ni in NbCr2(HT) phase as solid solution.
Publication date
PublisherJ-Stage
AffiliationNational Research Council Canada; Aerospace
Peer reviewedYes
NPARC number21275469
Export citationExport as RIS
Report a correctionReport a correction
Record identifier5d04a9ed-206a-4ff3-a09e-647f6bf3ddd8
Record created2015-07-14
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)