High temperature characteristics of Ir–Ta coated and aluminized Ni-base single crystal superalloys |
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| Authors: | A Suzuki F Wu H Murakami H Imai |
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| Affiliation: | a Shibaura Institute of Technology, 3-9-14 Shibaura, Minato-ku, Tokyo, Japan;b High Temperature Materials 21 Project, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba Science City, Ibaraki, Japan;c Department of Materials Engineering, School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan |
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| Abstract: | 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. |
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| Keywords: | EB-PVD Ir– Ta coating Low activity Al pack cementation process Diffusion barrier Ni-base single-crystal superalloy |
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