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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.44  No.9 (2003)  >  pp.1675-1678

MATERIALS TRANSACTIONS
<<Previous article Vol.44  No.9 (2003)   pp.1675 - 1678 Next article>>

Cyclic Oxidation Behavior of Iridium-Modified Aluminide Coatings for Nickel-Base Single Crystal Superalloy TMS-75

Feng Wu1), Hideyuki Murakami2) and Hiroshi Harada1)
1) High Temperature Materials 21 Project, Materials Engineering Laboratory, National Institute for Materials Science (NIMS)
2) Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo


The oxidation behavior of iridium-modified aluminide (Ir–Al) coating obtained by a two-step process was investigated. A pure Ir layer was first electrodeposited on the nickel-base single crystal superalloy TMS-75, and then the Ir-coated TMS-75 was treated by a conventional low activity pack-cementation aluminizing process. The oxidation resistance of the Ir–Al coated TMS-75 and the simply aluminized TMS-75 was evaluated by a cyclic oxidation test at 1373 K in air. The results showed that the Ir–Al coated TMS-75 had better thermal cyclic oxidation resistance than the simply aluminized TMS-75. The existence of Ir in the Ir–Al coatings may promote the formation of dense and adherent Al2O3 scale and thus retard the degradation of β-(Ir, Ni)Al phase during oxidation process.


Keyword:
electrodeposition, low activity aluminium-pack cementation process, iridium-modified coating, nickel-base superalloy

Received: April 24, 2003
Accepted: June 18, 2003 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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