Wear of hydrogenated DLC in MoDTC-containing oils
File(s)
Published version
Author(s)
Ueda, Mao
Kadiric, Amir
Spikes, Hugh
Type
Journal Article
Abstract
This paper describes a study of the effect on MoDTC-promoted a-C:H DLC wear of adding various surface-active additives used in engine lubricants, including ZDDP, an ashless EP additive, Ca detergents, dispersants, an OFM and a PAMA, to an MoDTC solution. Tribofilms formed on wear tracks on steel were analysed using SLIM, TEM, STEM-EDX, Raman spectroscopy and XPS. Relevant mechanisms by which these additives reduce the impact of MoDTC on DLC wear have also been suggested. DLC wear in PAO+Mo can be reduced by the presence of other surface-active additives in three ways. Firstly, asperity contact between DLC and steel can be mitigated by forming thick antiwear tribofilms. Secondly, other additives can increase the ratio of MoS2:MoO3, reducing the amount of wear-enhancing MoO3 in the tribofilm. Thirdly, the amount of MoDTC tribofilm including MoO3 can be reduced by the competitive adsorption of other surface-active additives. This study has practical implications for ways in which DLC surfaces can be protected by lubricant formulation.
Date Issued
2021-06
Date Acceptance
2021-03-09
Citation
Wear, 2021, 474-475, pp.1-10
ISSN
0043-1648
Publisher
Elsevier BV
Start Page
1
End Page
10
Journal / Book Title
Wear
Volume
474-475
Copyright Statement
© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
License URL
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Identifier
https://www.sciencedirect.com/science/article/pii/S0043164821002581?via%3Dihub
Grant Number
EP/P030211/1
Subjects
Mechanical Engineering & Transports
0910 Manufacturing Engineering
0912 Materials Engineering
0913 Mechanical Engineering
Publication Status
Published
Article Number
203869
Date Publish Online
2021-03-13