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Analysis of the tribological interaction of a polytetrafluoroethylene-lined radial lip oil seal, shaft and lubricant sample

Shabbir, Sarah; Garvey, Seamus D.; Dakka, Sam M.; Rothwell, Benjamin C.; Su, Rong; Leach, Richard; Weston, Nicola

Analysis of the tribological interaction of a polytetrafluoroethylene-lined radial lip oil seal, shaft and lubricant sample Thumbnail


Authors

Sarah Shabbir

Rong Su

Nicola Weston



Abstract

To investigate the tribological interaction and wear mechanisms of polytetrafluoroethylene-lined radial lip oil seals in service, a sleeve, seal and lubricant sample taken off a rotating rig are studied. The test was terminated at 72 h, after severe leakage in the final 15 h of the test. All three components are studied using a coherence scanning interferometer and environmental scanning electron microscopy to investigate wear after testing. Results show a wear band on the aerospace grade case-hardened sleeve, appearing as a 'polished in' area by the seal. A study of the filler content of the polytetrafluoroethylene coating uncover glass fibres, calcium carbonate, carbon and graphite layers present, assumed responsible for the wear to the sleeve. The polytetrafluoroethylene coating is a 300 μm coating, distinct from the bulk elastomer. This finding is confirmed after observing this layer on both, the tested and new seal lip. Wear of the seal lip is measured and facilitated by comparison to the identical new seal. Lastly, debris from the seal and sleeve wear are found in the lubricant sample.

Citation

Shabbir, S., Garvey, S. D., Dakka, S. M., Rothwell, B. C., Su, R., Leach, R., & Weston, N. (2022). Analysis of the tribological interaction of a polytetrafluoroethylene-lined radial lip oil seal, shaft and lubricant sample. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 236(1), 123-143. https://doi.org/10.1177/13506501211005876

Journal Article Type Article
Acceptance Date Mar 8, 2021
Online Publication Date Mar 29, 2021
Publication Date 2022-01
Deposit Date Apr 1, 2021
Publicly Available Date Apr 9, 2021
Journal Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
Print ISSN 1350-6501
Electronic ISSN 2041-305X
Publisher SAGE Publications
Peer Reviewed Peer Reviewed
Volume 236
Issue 1
Pages 123-143
DOI https://doi.org/10.1177/13506501211005876
Keywords Mechanical Engineering; Surfaces, Coatings and Films; Surfaces and Interfaces
Public URL https://nottingham-repository.worktribe.com/output/5427892
Publisher URL https://journals.sagepub.com/doi/10.1177/13506501211005876

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