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  4. Running-in effects of lubricated polyether ether ketone on steel for different spreading and sorption tendencies
 
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2023
Journal Article
Title

Running-in effects of lubricated polyether ether ketone on steel for different spreading and sorption tendencies

Abstract
Polyether ether ketone is a highly resilient thermoplastic that can withstand as an unfilled or filled polymer tribological high loads in high-temperature applications, as it has a high glass and melting temperature. Currently, it attracts interest as a lubricated material for drive systems to minimize noise, as a lightweight solution improving the CO2 balance, or in combination with novel lubricants. We have produced friction and wear maps with pin-on-disk tests on steel axial bearing rings and investigated the interaction and running-in behavior with different lubricants, such as different polyalkylene glycols, polyalphaolefin, and various esters. In general, the behavior of polyether ether ketone is hardly influenced by the frictional heat when loaded at room temperature. It shows a lubricant-specific polymer transfer and surface softening. This running-in impact is enhanced if a loading strategy with initial high friction power is applied. The beneficial transfer forms on the track in mixed lubrication on the rough counterpart until an increasing adhesive contact limits this effect. The appearance of a minimal wear coefficient was found below the glass temperature with lubricants strongly sorbing in polyether ether ketones, such as polar polyalkylenglycol or trimellitic acid ester-based lubricants. Using the interfacial energy of the system to derive an energy term describing the tendency to form a stable transfer, systematic trends in the tribological behavior of polyether ether ketone and polyketone could be identified that can be projected on other systems.
Author(s)
Koplin, Christof  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Schlüter, Bernadette
Fraunhofer-Institut für Werkstoffmechanik IWM  
Jaeger, Raimund  orcid-logo
Fraunhofer-Institut für Werkstoffmechanik IWM  
Journal
Lubricants  
Project(s)
Untersuchung des Zusammenhangs zwischen Schmierstoff-Kunststoff-Wechselwirkungen und mechanischen sowie tribologischen Eigenschaften zur verbesserten Materialauswahl  
Funder
Bundesministerium für Wirtschaft und Klimaschutz -BMWK-
Open Access
DOI
10.3390/lubricants11030135
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • spreading

  • sorption

  • transfer

  • mixed lubrication

  • wear

  • polymer

  • run-in

  • surface hardness

  • lubricant substitution

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