Paper Title:
Effect of Hf Addition on High Temperature Properties of Ir-Containing Alloy Coatings
  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.

  Info
Periodical
Materials Science Forum (Volumes 546-549)
Edited by
Yafang Han et al.
Pages
1689-1694
DOI
10.4028/www.scientific.net/MSF.546-549.1689
Citation
H. Murakami, K. Kamiya, A. Yamaguchi, Y. N. Wu, S. Kuroda, "Effect of Hf Addition on High Temperature Properties of Ir-Containing Alloy Coatings", Materials Science Forum, Vols. 546-549, pp. 1689-1694, 2007
Online since
May 2007
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$32.00
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