Materials Transactions Online

Materials Transactions, Vol.46 No.08 (2005) pp.1760-1763
© 2005 The Japan Institute of Metals

Microstructual Characterization of Sputtered Pt--Ir Coatings on Ni-Base Single Crystal Superalloy

Aya Suzuki1,, Masanori Harada2, Yingna Wu1 and Hideyuki Murakami1

1Thermal Spray Group, Materials Engineering Laboratory, National Institute for Materials Science, Tsukuba 305-0047, Japan
2Undergraduate Student, Department of Materials Engineering, Graduate School of Engineering, the University of Tokyo, Tokyo 113-8656, Japan

Characterization of Pt--Ir alloy coatings on a Ni-base single crystal superalloy was carried out. Pt--Ir alloys with varied composition were sputter-deposited on TMS-82+, which were then subjected to annealing and Al-pack cementation treatments. It was found that all the as-deposited films consisted of Pt--Ir solid solutioned fcc single phase, while the annealing treatment at 1423 K for 1 h drastically changed the microstructure, depending on the composition of coated layers. On the other hand, concentration profiles of alloying elements were not drastically changed by the Al-pack cementation process. It was also revealed that Ir addition increases the surface hardness of all the as-deposited, annealed, and aluminized specimens.

(Received 2005/4/26; Accepted 2005/6/16; Published 2005/8/15)

Keywords: platinum--iridium, bond coat, aluminizing, Ni-base superalloy

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