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

Feng Wu, Hideyuki Murakami, Hiroshi Harada

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1675-1678
Number of pages4
JournalMaterials Transactions
Volume44
Issue number9
DOIs
Publication statusPublished - 2003 Jan 1
Externally publishedYes

Fingerprint

Iridium
heat resistant alloys
iridium
Nickel
Superalloys
Single crystals
nickel
coatings
Coatings
Oxidation
oxidation
oxidation resistance
single crystals
Oxidation resistance
aluminum coatings
cementation
degradation
Degradation
air
Air

Keywords

  • Electrodeposition
  • Iridium-modified coating
  • Low activity aluminium-pack cementation process
  • Nickel-base superalloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Cyclic Oxidation Behavior of Iridium-Modified Aluminide Coatings for Nickel-Base Single Crystal Superalloy TMS-75. / Wu, Feng; Murakami, Hideyuki; Harada, Hiroshi.

In: Materials Transactions, Vol. 44, No. 9, 01.01.2003, p. 1675-1678.

Research output: Contribution to journalArticle

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N2 - 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.

AB - 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.

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