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Synthesis and cyclic oxidation behavior of a (Ni, Pt) Al coating on a desulfurized Ni-base superalloy

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Abstract

The influences of sulfur impurities and Pt incorporation on the scale adhesion behavior of aluminide coatings were studied and compared. Low-sulfur NiAl coatings were prepared on a desulfurized, yttrium-free, single-crystal Ni-based superalloy by a modified version of a conventional aluminizing procedure based on chemical vapor deposition. The sulfur level in the resulting NiAl coatings was measured to be less than ∼0.5 ppmw by glow-discharge mass spectroscopy. Platinum-modified aluminide coatings were synthesized by first electroplating a thin layer of Pt (∼7 µm) on the superalloy, followed by the same low-sulfur aluminizing procedure. The measured sulfur content in the (Ni, Pt)Al coating was substantially higher than that of the low-sulfur NiAl coating due to contamination during the Pt electroplating process. A very adherent α-Al2O3 scale formed on the grain surfaces of the low-sulfur NiAl coating during cyclic oxidation testing at 1150 °C, but scale spallation eventually occurred over many of the NiAl grain boundaries. In contrast, despite the higher level of sulfur in the (Ni Pt)Al coating, a very adherent scale was formed over both the coating grain surfaces and grain boundaries during thermal cycling. These results suggest that Pt additions can mitigate the detrimental influence of sulfur on scale adhesion.

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Author notes

  1. Y. Zhang (Graduate Student)

    Present address: the Department of Materials Science and Engineering, University of Tennessee, 37996, Knoxville, TN

Authors and Affiliations

  1. Walbar Metals, 01960, Peabody, MA

    Y. Zhang (Graduate Student)

  2. Department of Materials Science and Engineering, Stevens Institute of Technology, 07030, Hoboken, NJ

    W. Y. Lee (Associate Professor)

  3. the Oak Ridge National Laboratory, 37831, Oak Ridge, TN

    J. A. Haynes (Research Staff Member), I. G. Wright (Research Staff Member) & K. M. Cooley (Engineering Technician)

  4. the Department of Materials Science and Engineering, University of Tennessee, 37996, Knoxville, TN

    P. K. Liaw (Professor)

Authors
  1. Y. Zhang
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  4. I. G. Wright
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  5. K. M. Cooley
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Zhang, Y., Lee, W.Y., Haynes, J.A. et al. Synthesis and cyclic oxidation behavior of a (Ni, Pt) Al coating on a desulfurized Ni-base superalloy. Metall Mater Trans A 30, 2679–2687 (1999). https://doi.org/10.1007/s11661-999-0308-1

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  • DOI: https://doi.org/10.1007/s11661-999-0308-1

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