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Abstract Polymeric composites show promising self-lubricating properties for low temperature applications, yet the lubrication mechanism still remains unresolved. Here, we report the friction and wear behaviors and mechanisms of a… Click to show full abstract
Abstract Polymeric composites show promising self-lubricating properties for low temperature applications, yet the lubrication mechanism still remains unresolved. Here, we report the friction and wear behaviors and mechanisms of a hybrid composite based on polyetheretherketone (PEEK) and polytetrafluoroethylene (PTFE) at temperatures ranging from 20 °C to −100 °C in vacuum with relatively large load of 10 N. The friction coefficient maintains lower than 0.1 over this wide temperature range with a minimum value at −70 °C due to the combined effects of transfer film formation and thermally activated sliding. As for self-lubricating spherical plain bearings lubricated by Nomex/PTFE fabric, we show direct evidence of transfer film formation on the outer surface of the inner ring after tribotest at −160 °C in nitrogen gas.
Journal Title: Tribology International
Year Published: 2020
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