The influence of Al2O3 particle morphology on the coating formation and dry sliding wear behavior of cold sprayed Al–Al2O3 composites

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1016/j.surfcoat.2015.01.057
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Name affiliation
  1. National Research Council Canada. Automotive and Surface Transportation
FormatText
TypeArticle
Journal titleSurface & Coatings Technology
ISSN0257-8972
1879-3347
Volume270
Pages324–333
Subjectcold spray; dry sliding wear; in situ tribometry; Al–Al2O3; metal matrix composites
Abstract
Five Al–Al2O3 coatings were deposited by gas dynamic cold spray, using feedstocks containing 0, 10, and 50 wt.% of Al2O3 particles admixed into commercially pure Al powders. Two feedstocks were made using Al2O3 powders with an angular, blocky Al2O3 morphology, two feedstocks used Al2O3 powders with a spherical morphology, and the fifth consisted of 100% Al. The influence of Al2O3 concentration and morphology in the feedstock powders on the cold spray coating formation was measured in terms of Al2O3 recovery in the coatings, deposition efficiency, and microstructural analysis. The Al–Al2O3 coatings were then subjected to dry sliding wear experiments from which the friction, wear, and microevolution of third body structures in the wear track and transfer film were observed. The spherical Al2O3 morphology was associated with improved tribological behavior compared to the angular morphology when comparing similar coating concentrations of Al2O3.
Publication date
PublisherElsevier
LanguageEnglish
Peer reviewedYes
NPARC number21275331
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