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Oxidation Behavior of Pt–Ir Modified Aluminized Coatings on Ni-base Single Crystal Superalloy TMS-82+

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Abstract

The oxidation resistance of Pt–Ir modified aluminized coatings, prepared by magnetron sputtering, was investigated. Cyclic oxidation tests revealed that Pt–30 at%Ir and Pt–50 at%Ir modified aluminide coatings demonstrated a smaller mass change compared with Pt, Pt–80 at%Ir and Ir modified aluminide coatings. Cross-sectional analyses following cyclic oxidation tests showed that the TGO layer formed on the Pt modified aluminide coating surface is almost twice as thick as those on the Pt–30 at%Ir and Pt–50 at%Ir coatings. In addition, the Pt–30 at%Ir and Pt–50 at%Ir samples had a much smoother surface than the Pt modified coatings after cyclic oxidation, and the latter suffered from severe surface rumpling. However, when the Ir content exceeded 80 at% in Pt–Ir modified coatings, internal voids formed during cyclic oxidation. These results show that the addition of 30–50 at%Ir to Pt-modified aluminized coatings is most effective in enhancing oxidation resistance.

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Acknowledgments

A part of this work has been carried out under the auspices of JSPS Grants-in Aid for Scientific Research, Grant-No. 16360343. The authors would like to acknowledge Profs. D. Young, T. Narita, and B. Gleeson for fruitful discussions and suggestions. The authors also thank Dr. H. Harada for supplying substrate Ni-base single-crystal superalloy TMS-82+.

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Authors and Affiliations

  1. Coating Materials Group, Composites and Coatings Center, National Institute for Materials Science, 1-2-1, Sengen, Tsukuba Science City, Ibaraki, 305-0047, Japan

    Aya Suzuki, Yingna Wu, Akihiro Yamaguchi & Hideyuki Murakami

  2. Department of Materials Science and Metallurgy, University of Cambridge/Rolls-Royce University Technology Centre, Pembroke Street, Cambridge, CB2 3QZ, UK

    Aya Suzuki & Catherine M. F. Rae

  3. Department of Materials Science and Engineering, Graduate School of Engineering, Shibaura Institute of Technology, 3-7-5, Toyosu, Koutou-ku, Tokyo, 135-8548, Japan

    Akihiro Yamaguchi

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  1. Aya Suzuki
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  2. Yingna Wu
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  3. Akihiro Yamaguchi
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  4. Hideyuki Murakami
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  5. Catherine M. F. Rae
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Correspondence to Aya Suzuki.

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Suzuki, A., Wu, Y., Yamaguchi, A. et al. Oxidation Behavior of Pt–Ir Modified Aluminized Coatings on Ni-base Single Crystal Superalloy TMS-82+. Oxid Met 68, 53–64 (2007). https://doi.org/10.1007/s11085-007-9056-z

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  • DOI: https://doi.org/10.1007/s11085-007-9056-z

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