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Development of an Oxidation Resistant Coating on Nb-Based Ultra-High Temperature Alloy

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Abstract:

A coating with a duplex layer structure, outer β-NiAl and inner σ-Re-Cr-Ni layers, was formed on the third generation Nb-5Mo-15W-16Si- 5Hf-5C alloy by using successively Re-pack cementation, electroplating of Re-Ni film, and Cr/Al pack cementation. The duplex layer coating changed during high temperature oxidation to form a coating with a four layer structure: an outermost Ni2Al3, an outer Ni, an inner σ-Re-Cr-Ni, and an innermost χ-Re-Nb. The Re-pack cementation was carried in an alumina crucible where the specimen was buried in Re metal powder, in vacuum at 1573K to form a Re film, and then a Re-Ni film was electroplated onto the Re-pack treated alloy. The coated alloy formed a protective α-Al2O3 scale when oxidized at 1573K in air for 14.4ks. It was concluded that the σ-Re-Cr-Ni phase can act as a diffusion-barrier against both inward Al diffusion and outward diffusion of alloying elements from the alloy substrate to the β-NiAl.

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Periodical:

Materials Science Forum (Volumes 522-523)

Pages:

309-316

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.522-523.309

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Online since:

August 2006

Authors:

Kosuke Saito, Shigenari Hayashi, Toshio Narita, Isao Iwanaga, Ryohei Tanaka

Keywords:

Coating, Diffusion Barrier, High Temperature Oxidation, Nb-Based Alloys

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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