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Hot corrosion behavior of Pt-Ir modified aluminide coatings on the nickel-base single crystal superalloy TMS-82+

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Abstract

Platinum-iridium films (Ir = 0, 32, 46, 83, 100 at.%) were deposited on the nickel-base single crystal superalloy through magnetron sputtering. After annealing and aluminizing, the Pt-Ir modified aluminide coatings mainly consisted of PtAl2 and β-(Ni,Pt,Ir)Al phases. Hot corrosion resistance of Pt-Ir modified aluminide coatings with the different Ir contents were evaluated by exposure at 1173 K in the presence of the 90%Na2SO4 + 10%NaCl (wt%) salt deposits. The corrosion kinetics curves of the specimens were plotted up to 100 h heating time. The phase constitution, morphology of corrosion products, and element concentrations along the cross section were also measured. The lowest mass gain (0.299 mg/cm2, after 100 h) was observed for Pt-46Ir aluminide coating because the dense and continuous protective Al2O3 scale formed. Phase transformation from β-(Ni,Pt)Al to γ′-(Ni,Pt)3Al, characteristics of the scale, and protection by Pt/Ir enriched layer had the important effects on the hot corrosion behavior of modified aluminide coatings.

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Authors and Affiliations

  1. Coating Materials Group, Composites and Coatings Center, National Institute for Materials Science (NIMS), Tsukuba, 305-0047, Japan

    Y. N. Wu

  2. Coating Materials Group, Composites and Coatings Center, National Institute for Materials Science (NIMS), Tsukuba, 305-0047, Japan

    A. Yamaguchi

  3. Graduate School of Engineering, Division of Materials Science and Engineering, Shibaura Institute of Technology, Tokyo, 135-8548, Japan

    A. Yamaguchi

  4. Coating Materials Group, Composites and Coatings Center, National Institute for Materials Science (NIMS), Tsukuba, 305-0047, Japan

    H. Murakami & S. Kuroda

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  1. Y. N. Wu
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  2. A. Yamaguchi
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  3. H. Murakami
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  4. S. Kuroda
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Correspondence to Y. N. Wu.

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Wu, Y.N., Yamaguchi, A., Murakami, H. et al. Hot corrosion behavior of Pt-Ir modified aluminide coatings on the nickel-base single crystal superalloy TMS-82+. Journal of Materials Research 22, 206–216 (2007). https://doi.org/10.1557/jmr.2007.0022

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