Abstract
Friction tests have been carried out on bearing steel friction pairs coated with a-C:H and ta-C under lubricated conditions with 1-hexadecene and pure oleic acid, respectively. Main results show that ta-C leads to the super-low regime with oleic acid (friction coefficient below 0.01) and that a-C:H is quite well lubricated by 1-hexadecen. Surface analyses by coupling X-ray photoelectron spectroscopy (XPS) and secondary ion mass spectrometry (SIMS) have been carried out in the case of oleic acid with ta-C and a-C:H coatings. Results show that tribochemical reactions have occurred. OH groups terminate the ta-C surface whereas a-C:H is covered by a thin tribofilm and is terminated by oleic acid monolayers. The superlow regime in the case of ta-C is mainly attributed to the presence of the OH-termination.
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Makoto KANO. He was graduated from the Master course of Metal Engineering of Tokyo Institute of Technology in 1981. He had worked for Nissan Motor Co., Ltd from 1981. He received the PhD degree in the mechanical engineering from Tokyo University in 1996. He moved to Kanagawa Industrial Technology Center in 2006. Recent research is focused on reducing friction of sliding parts in automotive engines using DLC coating with the environmentally friendly lubricant.
Kentaro YOSHIDA. He received his MS degree in Chemical Engineering in 2000 from Tokyo Institute of Technology, Tokyo, Japan. After then, he worked for the Environmental Laboratory at the Toshiba CO., LTD from 2000. He joined the Material Technology Division at Kanagawa Industrial Technology Center from 2006. His research interests include the tribology of hard coatings and tribo-chemical reaction phenomena with lubricants.
Jean Michel MARTIN. He is a Professor Emeritus at Ecole Centrale de Lyon (University of Lyon, France) since 2011. He obtained his PhD in 1978 from University of Lyon. He is an honorary member of the University Institute of France (IUF). He has more than 35 years of extensive experience in fundamental and applied research in tribology of thin films, diamondlike coatings, boundary lubrication, antiwear and extreme-pressure additives, and surface analysis, who discovered superlubricity of pure MoS2 in ultrahigh vacuum and superlubricity of DLC coatings with OH-containing lubricants, implemented new additive formulations for metalforming and engine applications, and developed new analytical techniques for tribofilm analyses (XPS/AES/ToF-SIMS, XANES, etc.). He has published more than 160 papers in tribology, surface analysis and lubricant engineering and possesses 14 patents.
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Kano, M., Martin, J.M., Yoshida, K. et al. Super-low friction of ta-C coating in presence of oleic acid. Friction 2, 156–163 (2014). https://doi.org/10.1007/s40544-014-0047-1
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DOI: https://doi.org/10.1007/s40544-014-0047-1