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Microstructure and oxidation behavior of Al plus Cr co-deposited coatings on nickel-based superalloys

TitleMicrostructure and oxidation behavior of Al plus Cr co-deposited coatings on nickel-based superalloys
Publication TypeJournal Article
Year of Publication2017
AuthorsLin, RQ, Fu, C, Liu, M, Jiang, H, Li, X, Ren, ZM, Russell, AM, Cao, GH
Journal Coatings Technology
Volume310
Pagination273-277
Date Published01
Type of ArticleArticle
ISBN Number0257-8972
Accession NumberWOS:000393347400036
Keywordsalloy, chromium, coatings, codeposition, corrosion behavior, cr, diffusion coatings, hot-corrosion, Materials Science, method, Microstructure, modified aluminide coatings, oxidation, Pack cementation, physics, resistance, superalloys, thermal barrier coatings
Abstract

The microstructure and oxidation behavior were investigated in Al and Cr co-deposited diffusion coatings prepared by the pack cementation process. The composition (in wt.%) of the packs was 3NH(4)Cl-xAl-(25-x)Cr-72Al(2)O(3) with different Al levels (x = 0.5,1,2,4, and 10). After the heat-treatment process, the corresponding microstructure of the coatings was Cr + Cr2Ni3 + Al-rich phase, Cr + Cr2Ni3, Cr + NiAl + Ni3Al and NiAl + AlCr2, respectively. The isothermal oxidation tests were performed at 950 degrees C for up to 100 h in air, and the oxidation kinetic curves were obtained. It indicated that the coatings formed in the packs containing 1.2 wt.% Al had the lowest weight gain, while the weight gain of the coating formed in the packs having 4 wt.% Al was the largest. The presence of Cr in Al and Cr co-deposited coatings promotes Al2O3 generation. The formation mechanisms of Al + Cr co-deposited coatings and the effect of Cr in different types of coatings during the oxidation process were discussed. (C) 2016 Elsevier B.V. All rights reserved.

DOI10.1016/j.surfcoat.2016.12.096
Custom 1

Not AL

Short TitleSurf. Coat. Technol.
Alternate JournalSurf. Coat. Technol.