High temperature characteristics of Ir-Ta coated and aluminized Ni-base single crystal superalloys

A. Suzuki, F. Wu, H. Murakami, H. Imai

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High temperature oxidation and .hot corrosion properties of Ir-Ta coated and aluminized Ni-base superalloys are presented. An Ir-Ta binary alloy, proposed as a novel metallic bond coat material, was coated on a Ni-base single crystal superalloy TMS-75 using electron beam physical vapor deposition, followed by a conventional low activity Al pack cementation process. Cyclic oxidation tests and hot corrosion tests revealed that these Ir-Ta coated and aluminized specimens showed reasonably good oxidation and hot corrosion resistance. In addition, it was found that the formation of TCP phases is suppressed by the presence of the Ir-Ta enriched layer. These results indicated that the Ir-Ta alloy system is promising as a new metallic bond coat material for high temperature structural materials.

Original languageEnglish
Pages (from-to)555-564
Number of pages10
JournalScience and Technology of Advanced Materials
Issue number5-6
Publication statusPublished - 2004 Sep 1



  • Diffusion barrier
  • EB-PVD
  • Ir-Ta coating
  • Low activity Al pack cementation process
  • Ni-base single-crystal superalloy

ASJC Scopus subject areas

  • Materials Science(all)

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