This work focuses on the tribochemistry of molybdenum dithiocarbamate (MoDTC) oil additive to improve friction behavior of diamond-like-carbon (DLC) coated systems lubricated in boundary regime. Raman microscopy has been used to investigate surface tribolayers formed on coated (hydrogenated a-C:H and non-hydrogenated ta-C) and steel surfaces when lubricated with model lubricants and commercial engine oils. The effect of the additive package and the type of DLC played a crucial role in the development and composition of the tribolayer and the friction performance. The additive package contained in the fully formulated (FF) oils limited the friction reduction capabilities of MoDTC additive for every material pair. Accelerated a-C:H coating wear related to MoDTC tribochemistry was found. For the first time, it has been shown that a distinctive MoS2-containing tribolayer can be formed on the ta-C surface, leading to a coefficient of friction lower than 0.04. The underlying mechanisms of MoDTC/surface interactions and their effect on friction and wear are discussed.
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January 2019
Research-Article
MoDTC Tribochemistry in Steel/Steel and Steel/Diamond-Like-Carbon Systems Lubricated With Model Lubricants and Fully Formulated Engine Oils
Cayetano Espejo,
Cayetano Espejo
Institute of Functional Surfaces,
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
e-mail: c.espejoconesa@leeds.ac.uk
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
e-mail: c.espejoconesa@leeds.ac.uk
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Benoît Thiébaut,
Benoît Thiébaut
TOTAL, Centre de Recherche de Solaize,
Chemin du Canal,
Solaize BP 22-69360, France
Chemin du Canal,
Solaize BP 22-69360, France
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Frédéric Jarnias,
Frédéric Jarnias
TOTAL, Centre de Recherche de Solaize,
Chemin du Canal,
Solaize BP 22-69360, France
Chemin du Canal,
Solaize BP 22-69360, France
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Chun Wang,
Chun Wang
Institute of Functional Surfaces,
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
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Anne Neville,
Anne Neville
Institute of Functional Surfaces,
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
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Ardian Morina
Ardian Morina
Institute of Functional Surfaces,
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
Search for other works by this author on:
Cayetano Espejo
Institute of Functional Surfaces,
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
e-mail: c.espejoconesa@leeds.ac.uk
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
e-mail: c.espejoconesa@leeds.ac.uk
Benoît Thiébaut
TOTAL, Centre de Recherche de Solaize,
Chemin du Canal,
Solaize BP 22-69360, France
Chemin du Canal,
Solaize BP 22-69360, France
Frédéric Jarnias
TOTAL, Centre de Recherche de Solaize,
Chemin du Canal,
Solaize BP 22-69360, France
Chemin du Canal,
Solaize BP 22-69360, France
Chun Wang
Institute of Functional Surfaces,
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
Anne Neville
Institute of Functional Surfaces,
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
Ardian Morina
Institute of Functional Surfaces,
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
School of Mechanical Engineering,
University of Leeds,
Leeds LS2 9JT, UK
1Corresponding author.
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 29, 2018; final manuscript received July 20, 2018; published online August 24, 2018. Assoc. Editor: Xiaolei Wang.
J. Tribol. Jan 2019, 141(1): 012301 (12 pages)
Published Online: August 24, 2018
Article history
Received:
January 29, 2018
Revised:
July 20, 2018
Citation
Espejo, C., Thiébaut, B., Jarnias, F., Wang, C., Neville, A., and Morina, A. (August 24, 2018). "MoDTC Tribochemistry in Steel/Steel and Steel/Diamond-Like-Carbon Systems Lubricated With Model Lubricants and Fully Formulated Engine Oils." ASME. J. Tribol. January 2019; 141(1): 012301. https://doi.org/10.1115/1.4041017
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