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Transient processes of MoS 2 tribofilm formation under boundary lubrication
Author(s) -
Rai Y.,
Neville A.,
Morina A.
Publication year - 2016
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.1342
Subject(s) - rubbing , raman spectroscopy , lubrication , materials science , boundary lubrication , molybdenum , dithiocarbamate , composite material , metallurgy , optics , physics
A tribochemistry study that involves the application of Raman spectroscopy surface analysis has been undertaken to understand the time‐dependent tribochemical reactions, for lubrication by Molybdenum dialkyl‐dithiocarbamate (MoDTC) occurring in boundary lubricated conditions. Under the conditions of rubbing and high temperature, time‐resolved Raman spectroscopy results show the intermediate steps that lead to the MoDTC additive to be tribochemically structured on the wear scar of the contacting surface. A MoS 2 tribofilm with a lattice layer structure is observed on the wear scar whenever the lowest friction was achieved. An apparent shift of the A 1g and E 2g Raman modes, indicating qualitative and quantitative information on the MoS 2 tribofilm formed, is observed to be related to low friction. Detailed analyses of Raman spectra obtained on wear scars at different test durations and temperatures indicate that both temperature and rubbing are needed for the formation of low friction MoS 2 tribofilm. Copyright © 2016 John Wiley & Sons, Ltd.