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Article Dans Une Revue Surface and Coatings Technology Année : 2022

Synthesis of self-healing NiAl-Al2O3 composite coatings by electrochemical way

Résumé

Nickel aluminide diffusion coatings act like an aluminium reservoir to form protective alumina scales at high temperatures. However, interdiffusion phenomena play a critical role in the metallurgical integrity of these coatings. This work explores a new type of self-healing coating for high temperature oxidation applications. Micro-reservoirs consisting of an aluminium-rich intermetallic core (Al3Ni2) and an aluminium oxide shell are embedded in a nickel aluminide matrix (NiAl). This new type of coating has been synthesized by an electrochemical chemical route to trap the micro-reservoirs in an electrodeposited nickel matrix followed by aluminization via a slurry route. Under high temperature oxidation conditions, the micro-reservoirs allow to form a diffusion barrier and to release Al into the coating matrix. These two simultaneous phenomena make it possible to maintain a sufficient amount of aluminium and ensure the unique formation of α-alumina at the surface of the coatings, hence to possibly increase the lifespan of the aluminium diffusion coatings.

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Matériaux
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hal-04458173 , version 1 (22-07-2024)

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R. Troncy, L. Boccaccini, G. Bonnet, X. Montero, M.C. Galetz, et al.. Synthesis of self-healing NiAl-Al2O3 composite coatings by electrochemical way. Surface and Coatings Technology, 2022, 441, pp.128579. ⟨10.1016/j.surfcoat.2022.128579⟩. ⟨hal-04458173⟩
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