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

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

扫码查看
原文链接
  • NSTL
© 2022Nickel 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.

Composite coatingElectrodepositionNiAl-Al2O3OxidationSelf-healing coating

Troncy R.、Boccaccini L.、Bonnet G.、Pedraza F.、Montero X.、Galetz M.C.

展开 >

LaSIE La Rochelle Université UMR CNRS 7356

DECHEMA-Forschungsinstitut

2022

10.1016/j.surfcoat.2022.128579

Surface & Coatings Technology

Surface & Coatings Technology

ISTP
ISSN：0257-8972
年,卷(期)：2022.441
  • 50