2134/11366204.v1
Jamal Umer
Jamal
Umer
Nick Morris
Nick
Morris
Ramin Rahmani
Ramin
Rahmani
Sashi Balakrishnan
Sashi
Balakrishnan
Homer Rahnejat
Homer
Rahnejat
Nanoscale frictional characterisation of base and fully formulated lubricants based on activation energy components
Loughborough University
2019
Mechanical Engineering & Transports
friction
fluid cell LFM
fully formulated lubricant
base oil
activation energy
Eyring potential cage model
Mechanical Engineering
2019-12-16 11:12:45
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/Nanoscale_frictional_characterisation_of_base_and_fully_formulated_lubricants_based_on_activation_energy_components/11366204
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.