@inproceedings{36b78be637a6444084bfcd73e4f2a88d,
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.",
keywords = "Aluminizing, Bondcoat, Ir-Hf, Oxidation, Sputtering, Top-coat spallation",
author = "H. Murakami and K. Kamiya and A. Yamaguchi and Wu, {Y. N.} and S. Kuroda",
year = "2007",
month = jan,
day = "1",
doi = "10.4028/0-87849-432-4.1689",
language = "English",
isbn = "0878494324",
series = "Materials Science Forum",
publisher = "Trans Tech Publications Ltd",
number = "PART 3",
pages = "1689--1694",
booktitle = "Progress in Light Metals, Aerospace Materials and Superconductors",
edition = "PART 3",
note = "2006 Beijing International Materials Week, 2006 BIMW -International Conference on Aerospace Materials, ICAM 2006 ; Conference date: 25-06-2006 Through 30-06-2006",
}