Friction and wear of polyphenylene sulfide composites filled with micro and nano CuO particles in water-lubricated sliding |
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Authors: | M H Cho S Bahadur |
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Affiliation: | (1) Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA |
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Abstract: | The tribological behavior of polyphenylene sulfide (PPS) composites filled with micro and nano CuO particles in water-lubricated
sliding condition were studied. Pin-on-disk sliding tests were performed against a steel counterface of surface roughness
0.09–0.11 μm. The lubrication regimes were established from friction data corresponding to various combinations of loads and
sliding speeds. Later experiments were performed using the sliding speed of 0.5 m/s and contact pressure of 1.95 MPa, which
corresponded to boundary lubrication regime. Micro CuO particles as the filler were effective in reducing the wear of PPS
but nano CuO particles did not reduce wear. The steady state wear rate of PPS-30 vol.% micro CuO composite was about 10% of
that of unfilled PPS and the coefficient of friction in this case was the lowest. The examination of the topography of worn
pin surfaces of nano CuO-filled PPS by SEM revealed grooving features indicating three-body abrasion. The transfer films formed
on the counterfaces during sliding were studied by optical microscopy and AFM. The wear behavior of the composites in water-lubricated
sliding is explained using the characteristics of worn pin surfaces and transfer films on the counterface. |
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Keywords: | friction wear CuO filler nano particle polyphenylene sulfide transfer film AFM water lubrication bearing modulus |
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