Oxidation resistance and microstructure of Pt and PtIr diffusion coatings on Ni based single crystal superalloys by electroplating method

Dao Chi Tue; Hideyuki Murakami; Le Thi Hong Lien

doi:10.15625/2525-2518/57/6/13794

Author affiliations

Authors

Dao Chi Tue Center of Failure Analysis, Institute of Materials Science, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Hideyuki Murakami Research Center for Structural Materials, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki, 305-0047, Japan
Le Thi Hong Lien Center of Failure Analysis, Institute of Materials Science, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/57/6/13794

Keywords:

Platinum-Iridium, diffusion coating, electroplating, microstructure change, gas turbine

Abstract

In this study, Pt and PtIr diffusion coatings on Ni based single crystal superalloys were fabricated by an electroplating method followed by an annealing heat treatment process. The microstructure and phase constitution of the coatings were studied by SEM/EDS and XRD methods. The cyclic oxidation test at 1150^oC was conducted to investigate the oxidation resistance of the coatings. The results showed that the addition of Ir in the coating led to the formation of α(NiPt₂Al) phase and reduced the formation Kirkendall voids in the coating after 100 cycle oxidation test.

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