Oxidation resistance of electroplated Pt-Ir alloy coatings on Ni-based single crystal superalloys followed by diffusion annealing treatment

Yoshito Yasui, Hideyuki Murakami, Mikiyo Yoshida, Akihiro Sato, Akira Tateno, Seiji Kuroda, Hachiro Imai

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Abstract

Oxidation resistance of electroplated Pt and Pt-Ir alloy coatings followed by simple annealing heat treatments was investigated. The so-called 2nd generation Ni-based single crystal superalloy TMS-82 + and 4th generation TMS-138 were used as substrate materials. The cyclic oxidation tests and corresponding surface observations suggested the comparable oxidation resistance of Pt-coated TMS-82 + and Pt-Ir-coated TMS-138. However, cross-sectional microstructural analysis revealed that Pt-coated TMS-82 + exhibited the accelerated formation of voids, indicating the beneficial effect of Ir addition in terms of suppressed void formation. This study also revealed the importance of cross sectional analysis for thoroughly evaluating specimens subjected to the cyclic oxidation tests, and confirmed that oxidation resistance of the electroplated coatings was dependent on the quality of films deposited, which was drastically affected by the substrate surface finishing and substrate composition.

Original languageEnglish
Pages (from-to)913-918
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume73
Issue number12
DOIs
Publication statusPublished - 2009 Dec 1

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Keywords

  • Electrodeposition
  • Microstructural change
  • Nickel-based superalloy
  • Oxidation
  • Platinum-iridium

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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