Role of nanocrystalline feedstock in the tribological behaviour of alumina coatings deposited by detonation gun

Alumina coatings were prepared using detonation gun from commercial powder (CP) and high energy ball milled powder (MP) with 83nm crystallite size. The sliding wear rate and wear coefficient of friction were lower in the nanocrystalline powder coating. The coating from the as-received commercial pow...

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Bibliographic Details
Published in:International journal of refractory metals & hard materials 2012-11, Vol.35, p.108-114
Main Authors: Manojkumar, P.A., Gandhi, A.S., Kamaraj, M., Thomas Paul, V., Kumar, N., Tyagi, A.K.
Format: Article
Language:English
Subjects:
Aluminum oxide
Detonation gun coating
High energy ball milling
Nanocrystalline alumina
Sliding wear
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Summary:Alumina coatings were prepared using detonation gun from commercial powder (CP) and high energy ball milled powder (MP) with 83nm crystallite size. The sliding wear rate and wear coefficient of friction were lower in the nanocrystalline powder coating. The coating from the as-received commercial powder consisted of thick splats, and a paucity of nanoparticulate inter-splat regions whereas milled powder coating has thinner splat morphology with nanoparticulate inter-splat regions. The nanoparticulate material in the inter-splat regions and the finer microstructure of the MP coating is believed to be responsible for improved wear resistance. ► Nanocrystalline and microcrystalline powders were used for D-gun alumina coating. ► Nanocrystalline powder coating was tribologically superior. ► The coatings fracture along inter lamellar boundary rather than crystallite boundary. ► Finer microstructure and nano-particulate inter splat regions improved tribological properties.
ISSN:0263-4368
2213-3917
DOI:10.1016/j.ijrmhm.2012.04.018