An Improved Tribological Polymer-Coating System for Metal Surfaces |
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Authors: | Jing Zhang Andreas A Polycarpou James Economy |
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Affiliation: | (1) Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 W Green St., Urbana, IL 61801, USA;(2) Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 W Green St., Urbana, IL 61801, USA; |
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Abstract: | Aromatic thermosetting polyester (ATSP)- and polytetrafluoroethylene (PTFE)-blended composites have been shown to exhibit
improved tribological performance with low wear and low friction. In this article, pure ATSP films were coated on aluminum
substrates and tested as a potential protective tribological coating. The tribological performance of this coating was tested
against steel, using pure sliding sphere-on-disk experiments. A fluoroadditive powder (solid lubricant) was also added to
further enhance the ATSP film wear and friction properties. For comparison, a commercially available PTFE-based coating was
tested under the same conditions. Results show that the ATSP/fluoroadditive film has comparable coefficient of friction to
the commercial coating, but significantly lower wear. Surface analysis techniques were employed to investigate the low-friction
and low-wear mechanisms seen with the ATSP/fluoroadditive. Specifically TOF-SIMS depth-profiling showed that there is a high
density of fluorine element within the wear track and penetrates well below the surface of the wear track. |
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