We have succeeded for the first time anywhere in lowering the friction coefficient of a diamond-like-carbon (DLC) coating to less than 0.01 under boundary lubrication in engine oil [1–3]. This anomalous super-lubrication behavior has been observed for a hydrogen-free DLC-coated (ta-C) disc in an ester-containing oil but not for a hydrogenated DLC (a-C:H) coating. It is thought that some chemical adsorbent may form only on the ta-C sliding surface due to some tribochemical reactions. Our recent studies have suggested that the macro-scale reduction of friction is dependent on nanometer-scale tribological properties [4–6]. The superlow friction behavior seen in a pin-on-disc friction test was taken as the object of this investigation with an eye toward elucidating the mechanism of the anomalous friction reduction. Pin-on-disc tests were conducted by sliding a ta-C/ta-C pair in the presence of poly alpha-olefin based oil containing a modifier additive of glycerol monooleate ester (PAOES1 oil). Nanometer-scale tribological properties were investigated by using atomic force microscopy (AFM), the AFM phase-image technique, and nanoscratch measurements. Attention was focused on the differences in surface roughness, nanostructure and nanofriction coefficient between the sliding and non-sliding areas in an effort to find the origin of the super-lubrication behavior.
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World Tribology Congress III
September 12–16, 2005
Washington, D.C., USA
Conference Sponsors:
- Tribology Division
ISBN:
0-7918-4202-9
PROCEEDINGS PAPER
Super Low Friction Property of DLC Lubricated With Ester-Containing Oil: Part 2 — Nanometer-Scale Morphological, Structural and Frictional Properties Available to Purchase
Kenichi Ueoka,
Kenichi Ueoka
Nissan Arc, Ltd., Yokosuka, Japan
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Makoto Kano,
Makoto Kano
Nissan Motor Company, Ltd., Kanagawa, Japan
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Yoshiteru Yasuda,
Yoshiteru Yasuda
Nissan Motor Company, Ltd., Kanagawa, Japan
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Yusuke Okamoto,
Yusuke Okamoto
Nissan Motor Company, Ltd., Kanagawa, Japan
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Jean Michel Martin
Jean Michel Martin
Ecole Centrale de Lyon, Ecully Cedex, France
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Jiping Ye
Nissan Arc, Ltd., Yokosuka, Japan
Kenichi Ueoka
Nissan Arc, Ltd., Yokosuka, Japan
Makoto Kano
Nissan Motor Company, Ltd., Kanagawa, Japan
Yoshiteru Yasuda
Nissan Motor Company, Ltd., Kanagawa, Japan
Yusuke Okamoto
Nissan Motor Company, Ltd., Kanagawa, Japan
Jean Michel Martin
Ecole Centrale de Lyon, Ecully Cedex, France
Paper No:
WTC2005-63921, pp. 447-448; 2 pages
Published Online:
November 17, 2008
Citation
Ye, J, Ueoka, K, Kano, M, Yasuda, Y, Okamoto, Y, & Martin, JM. "Super Low Friction Property of DLC Lubricated With Ester-Containing Oil: Part 2 — Nanometer-Scale Morphological, Structural and Frictional Properties." Proceedings of the World Tribology Congress III. World Tribology Congress III, Volume 2. Washington, D.C., USA. September 12–16, 2005. pp. 447-448. ASME. https://doi.org/10.1115/WTC2005-63921
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