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• W3199743527 abstract "The tribological response of PTFE-based composites for mechanical seals can be significantly affected by the nature of the counterface. In this work, glass fibre (GF) and carbon fibre (CF) reinforced PTFE-matrix composites were slid, in a pin-on-disc configuration, against AISI 304 stainless steel, either uncoated or coated with plasma sprayed Cr 2 O 3 . When mated with uncoated steel, GF-PTFE composites tended to wear down more, but also produced a thicker and more continuous tribofilm than did CF-PTFE ones. The pulverized glass debris adsorbed humidity and formed a cohesive “skeleton” to keep the PTFE debris in place, thus resulting in comparatively lower friction coefficients of ≈0.20–0.27. On the other hand, the polished Cr 2 O 3 surface, with smooth plateaus and numerous valleys of various sizes, facilitated the retention of transfer material. Therefore, it produced less friction than uncoated steel, both against GF-PTFE and CF-PTFE, although the CF-PTFE pin showed a limited capacity to develop a tribofilm. CF-PTFE, however, suffered more severe wear than did GF-PTFE against Cr 2 O 3 , because the carbon fibres fractured more frequently. The bulk temperature of the composites never increased by more than 12 °C during the tests, and the rise in temperature depended more on the friction coefficient than on the thermal conductivity and diffusivity of the mated surfaces. • Debris from glass fibre/PTFE develops cohesive tribofilms that limit friction. • C-fibre/PTFE releases coarser debris that does not form equally cohesive tribofilms. • However, glass fibre/PTFE wears more than C-fibre/PTFE against uncoated steel. • Tribofilms are better retained by the negatively skewed surface profile of polished Cr 2 O 3 . • Low-friction tribocouples produce lower contact temperatures even when made of more thermally insulating materials." @default.
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• W3199743527 date "2021-12-01" @default.
• W3199743527 modified "2023-10-02" @default.
• W3199743527 title "Sliding wear behaviour of fibre-reinforced PTFE composites against coated and uncoated steel" @default.
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• W3199743527 doi "https://doi.org/10.1016/j.wear.2021.204097" @default.
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