Initial Aluminizing Steps of Pure Nickel from Al Micro-Particles

G. Bonnet; M. Mollard; B. Rannou; J. Balmain; Fernando Pedraza-Diaz; X. Montero; M. Galetz; Michael Schütze

doi:10.4028/www.scientific.net/DDF.323-325.381

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 323-325Initial Aluminizing Steps of Pure Nickel from Al...

Initial Aluminizing Steps of Pure Nickel from Al Micro-Particles

Abstract:

Novel, unconventional type of high temperature coating systems can be elaborated by depositing Al micro-particles on nickel base substrates, using an appropriate binder, and converting them into a thermal barrier type coating by a two-step heat treatment under argon. Final result is a coating structure consisting of a quasi-foam top coat, constituted by spherical hollow alumina particles, surmounting a β-NiAl diffusion layer able to form during high-temperature oxidation a protective alumina scale. In this work, pure nickel was employed as a model material to evaluate the effects of moderate temperatures (550-700°C), dwelling times and Al particle size on the final characteristics of the coatings. Almost no diffusion occurred below 600°C. In contrast, a Ni₂Al₃ layer very quickly formed at 650 or 700°C. The rapidity of coating formation was attributed to the appearance of a liquid phase at the coating/substrate interface. The increase of dwelling time did not provide any significant thickness increase as the Al particles got practically emptied after 2h. In addition, the use of different micro-sized particles resulted in similar Al diffusion coatings under the investigated conditions.

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Periodical:

Defect and Diffusion Forum (Volumes 323-325)

Pages:

381-386

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.323-325.381

Citation:

Cite this paper

Online since:

April 2012

Authors:

G. Bonnet, M. Mollard, B. Rannou, J. Balmain, Fernando Pedraza-Diaz, X. Montero, M. Galetz, Michael Schütze

Keywords:

Aluminium Diffusion Coatings, Micro-Particles, Nickel, Slurry

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