DLC-Coated Thermoplastics: Tribological Analyses under Lubricated Rolling-Sliding Conditions
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Date
2022-12-01
Authors
Reitschuster, Stefan
Maier, Enzo
Lohner, Thomas
Stahl, Karsten
Bobzin, Kirsten
Kalscheuer, Christian
Thiex, Matthias
Šperka, Petr
Hartl, Martin
0000-0002-4994-3144Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
SPRINGER/PLENUM PUBLISHERS
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Abstract
The goal of this work is to evaluate the potential of diamond-like carbon (DLC) coatings on thermoplastic polymers for friction and wear reduction in highly stressed rolling-sliding contacts. Therefore, hydrogen-containing DLC coatings were deposited on the polymer surface by a low-temperature high power pulsed magnetron sputtering (HPPMS) physical vapor deposition (PVD) process. The rolling-sliding contact between coated polyamide 66 (PA66) or coated polyether ether ketone (PEEK) against case-hardened steel 16MnCr5 is investigated in a twin-disk tribometer at normal loads up to F-N = 1,000 N, sum velocities between 1 m/s <= v(sigma) <= 16 m/s and slip ratios up to s = 50%. Results show a friction reduction with the application of DLC on the considered polymers compared to uncoated polymers under specific lubrication conditions. High solid losses caused by the polymer's internal damping properties dominate the temperature behavior of the polymer, even when coated with DLC. Regarding the wear behavior, DLC coatings show potential especially under severe mixed lubrication conditions with high-solid load portion and sliding. The knowledge gained about coated polymers can be used to improve the overall tribological performance in terms of friction and wear of thermoplastic machine elements like gears.
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Citation
Tribology Letters. 2022, vol. 70, issue 4, p. 1-16.
https://link.springer.com/article/10.1007/s11249-022-01664-6
https://link.springer.com/article/10.1007/s11249-022-01664-6
Document type
Peer-reviewed
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Published version
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en