Development of an iridium–tantalum modified aluminide coating as a diffusion barrier on nickel-base single crystal superalloy TMS-75

Wu, Feng; Murakami, Hideyuki; Suzuki, Aya

doi:10.1016/s0257-8972(03)00009-4

Cited by 61 publications

(33 citation statements)

References 12 publications

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“…Figs. 2 and 3 [11] show the (a) cross-sectional microstructure and (b) corresponding concentration profiles of solute elements in 'TMS-75 þ Al', before the oxidation test (Fig. 2) and after 30 oxidation cycles (Fig.…”

Section: Methodsmentioning

confidence: 99%

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High temperature characteristics of Ir–Ta coated and aluminized Ni-base single crystal superalloys

Suzuki

Murakami

et al. 2004

Science and Technology of Advanced Materials

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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. q

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Section: Methodsmentioning

confidence: 99%

“…Our preliminary investigation has shown that alminized Ir -Tacoated specimens have both good resistance against oxidation and ability to work as a diffusion retarder [11,12].…”

Section: Introductionmentioning

confidence: 99%

High temperature characteristics of Ir–Ta coated and aluminized Ni-base single crystal superalloys

Suzuki

Murakami

et al. 2004

Science and Technology of Advanced Materials

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“…[9][10][11][12] For further improvement in protection performances, application of Ir based alloys to the bond-coats has been proposed. [13][14][15][16][17][18][19] At the same time, a Re modified aluminide coating has been shown to exhibit notable performance as a diffusion barrier. [20] Despite such promising performances of Ir in structural and coating application fields, only limited information is available for atomic diffusivity in Ir based alloys.…”

Section: Introductionmentioning

confidence: 99%

Interdiffusion in the Ir-Rich Solid Solutions of Ir-Pt, Ir-Rh, and Ir-Re Binary Alloys

Sekido

Hoshino²,

Fukuzaki³

et al. 2011

J. Phase Equilib. Diffus.

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Interdiffusivity in the Ir-rich solid solutions of Ir-X (X = Pt, Rh and Re) binary alloys was investigated in the temperature range of 2073-2373 K. The interdiffusion coefficients within the solute concentration range up to 10 at.% were evaluated through conventional diffusion-couple experiments. The composition dependence of the interdiffusion coefficient was negligible in the Ir-Rh and Ir-Re solid solutions. On the other hand, some composition dependence was evident in the interdiffusion coefficient of the Ir-Pt solid solution, which increased with increasing Pt content. In comparison with the tracer self-diffusivity of pure Ir, the interdiffusivity in the Ir-Rh and Ir-Pt solid solutions was higher, but that in Ir-Re was lower within the temperature range studied.

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“…In addition, IrAl intermetallics have been found to have potential as alumina formers. 11) In our group, Ir-aluminide 12,13) and Ir-Ta modified aluminide coatings, 14) deposited through magnetron sputtering, electron beam physical vapor deposition (EB-PVD) or electroplating followed by aluminizing, have been evaluated in terms of their microstructure, mechanical properties and oxidation behaviors. In the present study, Pt-Ir, Pt/Pt-Ir and Ni/Pt-Ir systems were prepared through electrodeposition.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Electroplated Platinum–Iridium Alloys on the Nickel-Base Single Crystal Superalloy

Suzuki

Murakami

et al. 2005

Mater. Trans.

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As a high temperature protective layer, platinum-iridium alloys were electroplated on the nickel-base single crystal superalloy TMS-82+ from amidosulfuric acid solutions by the direct current method. It was found that Ir content in the films was always lower than the ratio of concentration ([Ir 3þ ]/([PtCl 6 2À ] + [Ir 3þ ])) in the electrolytes, indicating that preferential deposition of Pt occurred in this study. The asdeposited Pt-Ir films formed an fcc single phase structure with a granular surface. When Ir content exceeded 3 at%, Pt-Ir films exhibited the h111i preferred growth orientation. It was also found that pre-deposition of Ni and Pt promoted the deposition rate and changed composition of overlaying Pt-Ir films.

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Development of an iridium–tantalum modified aluminide coating as a diffusion barrier on nickel-base single crystal superalloy TMS-75

Cited by 61 publications

References 12 publications

High temperature characteristics of Ir–Ta coated and aluminized Ni-base single crystal superalloys

High temperature characteristics of Ir–Ta coated and aluminized Ni-base single crystal superalloys

Interdiffusion in the Ir-Rich Solid Solutions of Ir-Pt, Ir-Rh, and Ir-Re Binary Alloys

Characterization of Electroplated Platinum–Iridium Alloys on the Nickel-Base Single Crystal Superalloy

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Development of an iridium–tantalum modified aluminide coating as a diffusion barrier on nickel-base single crystal superalloy TMS-75

Cited by 61 publications

References 12 publications

High temperature characteristics of Ir–Ta coated and aluminized Ni-base single crystal superalloys

High temperature characteristics of Ir–Ta coated and aluminized Ni-base single crystal superalloys

Interdiffusion in the Ir-Rich Solid Solutions of Ir-Pt, Ir-Rh, and Ir-Re Binary Alloys

Characterization of Electroplated Platinum&ndash;Iridium Alloys on the Nickel-Base Single Crystal Superalloy

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Characterization of Electroplated Platinum–Iridium Alloys on the Nickel-Base Single Crystal Superalloy