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Title: Multiscale boundary frictional performance of diamond like carbon coatings
Authors: Humphrey, Edward
Morris, Nicholas J.
Rahmani, Ramin
Rahnejat, Homer
Keywords: DLC
Fractal surfaces
Contact mechanics
Issue Date: 2019
Publisher: Elsevier BV
Citation: HUMPHREY, E. ... et al., 2019. Multiscale boundary frictional performance of diamond like carbon coatings. Tribology International, In Press.
Abstract: This paper investigates the frictional performance of a PECVD hydrogenated undoped DLC coating and the alternative super-finished gear steel surface pairs. A tribometer replicates the conditions found in the conjunction of a performance racing transmission spur gear pair. In mixed and boundary regimes of lubrication the DLC contact is shown to have a lower coefficient of friction despite having comparable surface topography when measured using optical interferometry. To determine the mechanisms responsible for improved friction of DLC coated tribo-pairs atomic force microscopy is used. It is shown that the nanoscale surface topography of the investigated PECVD DLC coated pairs reduces the real asperity contact area formed at the same load carrying capacity. This highlights a contributing mechanism for improved friction with the DLC coating.
Description: This paper is in closed access until 30th Dec 2019.
Sponsor: The authors would like to express their gratitude to the Engineering and Physical Science Research Council (EPSRC) for the financial support extended to this research through the Doctoral Training Program (DTP).
Version: Accepted for publication
DOI: 10.1016/j.triboint.2018.12.039
URI: https://dspace.lboro.ac.uk/2134/36541
Publisher Link: https://doi.org/10.1016/j.triboint.2018.12.039
ISSN: 0301-679X
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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