Effect of substrate oxidation on spreading of plasma-sprayed nickel on stainless steel

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DOIResolve DOI: http://doi.org/10.1016/j.surfcoat.2007.04.041
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TypeArticle
Journal titleSurface & Coatings Technology
Volume202
Issue1
Pages2333; # of pages: 11
SubjectPlasma spraying; Particle impact; Adsorbates; Surface oxidation; Splashing
AbstractPlasma-sprayed, molten nickel particles (∼60 μm diameter) were photographed during impact on oxidized 304L stainless steel surfaces that were maintained at either room temperature or at 350 °C. Steel coupons were oxidized by heating them at different temperatures. A fast chargecoupled device (CCD) camera captured time-integrated images of the spreading splat. A two-color pyrometer collected thermal radiation from particles and recorded the evolution of their temperature after impact. Molten nickel particles impacting on oxidized steel at room temperature fragmented significantly, while heating the surfaces produced splats with disk-like morphologies. Impact on steel that was highly oxidized induced the formation of finger-like splash projections at the splat periphery. Thermal contact resistance between splats and non-heated oxidized steel was calculated from splat cooling rates and found to decrease as the degree of oxidation increased. On heated, oxidized steel thermal contact resistance was much lower and did not change significantly with the degree of oxidation. It was concluded that thermal contact resistance was largely influenced by adsorbates on the steel surface that evaporated when the surface was heated or oxidized.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number49396
NPARC number15795089
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Record identifier935d433c-c961-41db-b71e-b64fabd4a9c0
Record created2010-07-09
Record modified2016-05-09
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