Effect of Hf addition on high temperature properties of Ir-containing alloy coatings

H. Murakami, K. Kamiya, A. Yamaguchi, Y. N. Wu, S. Kuroda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

In the present study, high temperature properties of Ir-modified and Ir-Hf-modified aluminide coatings on Ni-based single crystal superalloy TMS-82+ were discussed. They were prepared by depositing pure Ir and Ir-Hf alloys on TMS-82+ using magnetron sputtering and EB-PVD, followed by a conventional Al-pack cementation process. The effects of Hf addition on the oxidation resistance and top-coat spallation resistance were investigated. Cyclic oxidation test at 1423K for 1h as one heating cycle revealed that while there is a small difference in oxidation kinetics and spallation lives between Ir and Ir-Hf coatings, drastic difference in surface morphology was observed. After 50 oxidation cycles the Ir-modified aluminide coating showed surface rumpling whereas the Ir-Hf modified aluminide coatings kept the flat surface. It was also revealed that excessive addition of Hf promoted the internal oxidation, resulting in the deterioration of substrates. These results agree with the conventional Pt-modified aluminide coatings and Ni-Al-Hf alloys.

Original languageEnglish
Title of host publicationProgress in Light Metals, Aerospace Materials and Superconductors
Pages1689-1694
Number of pages6
EditionPART 3
Publication statusPublished - 2007 Dec 1
Event2006 Beijing International Materials Week, 2006 BIMW -International Conference on Aerospace Materials, ICAM 2006 - Beijing, China
Duration: 2006 Jun 252006 Jun 30

Publication series

NameMaterials Science Forum
NumberPART 3
Volume546-549
ISSN (Print)0255-5476

Other

Other2006 Beijing International Materials Week, 2006 BIMW -International Conference on Aerospace Materials, ICAM 2006
CountryChina
CityBeijing
Period06/6/2506/6/30

    Fingerprint

Keywords

  • Aluminizing
  • Bondcoat
  • Ir-Hf
  • Oxidation
  • Sputtering
  • Top-coat spallation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Murakami, H., Kamiya, K., Yamaguchi, A., Wu, Y. N., & Kuroda, S. (2007). Effect of Hf addition on high temperature properties of Ir-containing alloy coatings. In Progress in Light Metals, Aerospace Materials and Superconductors (PART 3 ed., pp. 1689-1694). (Materials Science Forum; Vol. 546-549, No. PART 3).