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Nanoscale frictional characterisation of base and fully formulated lubricants based on activation energy components

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journal contribution
posted on 16.12.2019 by Jamal Umer, Nick Morris, Ramin Rahmani, Sashi Balakrishnan, Homer Rahnejat
Tribofilms are activated using precision sliding strip microscale tribometry with a base and a fully formulated lubricant with a ZDDP anti-wear additive. The employed tribometry uses combined pressure, shear and temperature activation. The chemical compositions of the formed tribofilms are ascertained through use of Photoelectron X–ray Spectroscopy (XPS). Nanoscale frictional measurements of the tribofilms are reported using fluid cell lateral force microscopy (LFM). The measured coefficient of interfacial boundary shear strength is used with analytical contact mechanics to relate the in-situ conditions to the activation energy components of the Eyring potential cage model. The paper shows that combined LFM and the Eyring model can explain the variations in the frictional characteristics of formed tribofilms.

Funding

Engineering and Physical Sciences Research Council (EPSRC)

BP through Centre for Doctoral Training in Embedded Intelligence (CDT-ei)

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Tribology International

Volume

144

Publisher

Elsevier

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

11/12/2019

Publication date

2019-12-12

Copyright date

2019

ISSN

0301-679X

Language

en

Depositor

Dr Ramin Rahmani . Deposit date: 13 December 2019

Article number

106115

Licence

Exports