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

Feng Wu; Hideyuki Murakami; Hiroshi Harada

doi:10.2320/matertrans.44.1675

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

Feng Wu^*, Hideyuki Murakami, Hiroshi Harada

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

26 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 language	English
Pages (from-to)	1675-1678
Number of pages	4
Journal	Materials Transactions
Volume	44
Issue number	9
DOIs	https://doi.org/10.2320/matertrans.44.1675
Publication status	Published - 2003 Sept
Externally published	Yes

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

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10.2320/matertrans.44.1675

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

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.",

keywords = "Electrodeposition, Iridium-modified coating, Low activity aluminium-pack cementation process, Nickel-base superalloy",

author = "Feng Wu and Hideyuki Murakami and Hiroshi Harada",

year = "2003",

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doi = "10.2320/matertrans.44.1675",

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publisher = "Japan Institute of Metals (JIM)",

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T1 - Cyclic Oxidation Behavior of Iridium-Modified Aluminide Coatings for Nickel-Base Single Crystal Superalloy TMS-75

AU - Wu, Feng

AU - Murakami, Hideyuki

AU - Harada, Hiroshi

PY - 2003/9

Y1 - 2003/9

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.

KW - Electrodeposition

KW - Iridium-modified coating

KW - Low activity aluminium-pack cementation process

KW - Nickel-base superalloy

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

Abstract

Keywords

ASJC Scopus subject areas

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