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The Tribological Behaviour of Carbon Fibre Reinforced Polyaryletherketones (PAEKs) through their Glass Transitions.
Dyson, C.J. Fox, M.F. Hopkins, B.
Dyson, C.J.
Fox, M.F.
Hopkins, B.
Publication Date
2016
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© 2016 The Authors and SAGE Publications Ltd. Reproduced in accordance with the publisher's self-archiving policy.The final, definitive version of this paper has been published in the Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology by SAGE Publications Ltd.
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openAccess
Accepted for publication
2015-10-13
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Abstract
Advanced engineering polymers of the Polyaryletherketone (PAEK) family with carbon fibre reinforcement are finding application in engineering systems as tribological bearing surfaces under severe operating conditions that cyclically move the polymer into and beyond the glass transition temperature region. To support such an application, the friction in high speed and low load PAEK-steel sliding contacts was investigated both unlubricated and lubricated with a trinonyl trimellitate ester, a base fluid for high temperature industrial lubricants. Four polymers in the PAEK family, PEEK, PEK, PEKEKK and PEKK, with 30%wt of carbon fibre whiskers were tested against an AISI 4140 steel disc. When unlubricated, low friction depended upon the formation of a PAEK transfer film on the steel disc and when this became unstable in the glass transition region the friction increased to much higher levels with associated polymer surface damage. Frictional heating due to the high sliding speed dominated the differences in glass transition behaviour between the four PAEKs. When lubricated, the lubricant film controlled friction and there was no significant effect of the glass transition of any of the PAEKs. The irreversible nature of the glass transition in PAEKs in such tribological applications, due to high surface damage at high temperature, means that it is essential to ensure effective lubrication in both fluid film and boundary lubrication.
Version
Accepted manuscript
Citation
Dyson CJ, Priest M, Fox MF and Hopkins B (2016) The Tribological Behaviour of Carbon Fibre Reinforced Polyaryletherketones (PAEKs) through their Glass Transitions. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology. 230(10):1183-1196.
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Article