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Super-low friction of ta-C coating in presence of oleic acid

Friction 2014年第2期2卷 156-163页

作者： Makoto KANO Jean Michel MARTIN Kentaro YOSHIDA maria isabel de barros bouchet Division of Mechanical&Material Engineering Kanagawa Industrial Technology Center705-1 Shimo-ImaizumiEbinaKanagawaJapan LTDS Ecole Centrale de Lyon 69380EcullyFrance

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,*** 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 *** 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 *** show that tribochemical reactions have *** groups terminate the ta-C surface whereas a-C:H is covered by a thin tribofilm and is terminated by oleic acid *** superlow regime in the case of ta-C is mainly attributed to the presence of the OH-termination.

关键词： epoxy composite short carbon fiber friction wear

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Mechanism of superlubricity of a DLC/Si_(3)N_(4) contact in the presence of castor oil and other green lubricants

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Friction 2022年第10期10卷 1693-1706页

作者： Yun LONG Yang WANG Volker WEIHNACHT Stefan MAKOWSKI Momoji KUBO Jean Michel MARTIN maria-isabel de barros bouchet Ecole Centrale de Lyon Laboratory of Tribology and System DynamicsUniversity of LyonEcully 69134France Institute for Materials Research Tohoku UniversitySendai 980-8577Japan department of Mechanical Systems Engineering Graduate School of EngineeringTohoku UniversitySendai 980-8579Japan Fraunhofer Institute for Material and Beam Technology(IWS) Dresden 01277Germany

To meet the surging needs in energy efficiency and eco-friendly lubricants,a novel superlubricious technology using a vegetable oil and ceramic materials is *** coupling different hydrogen-free amorphous carbon coatings with varying fraction of sp^(2) and sp^(3) hybridized carbon in presence of a commercially available silicon nitride bulk ceramic,castor oil provides superlubricity although the liquid vegetable oil film in the contact is only a few nanometres thick at *** a partial liquid film possibly separating surfaces in contact,local tribochemical reactions between asperities are essential to maintain superlubricity at low *** local pressure activates chemical degradation of castor oil generating graphitic/graphenic-like species on top of asperities,thus helping both the chemical polishing of surface and its chemical passivation by H and OH ***,the formation of the formation of–(CH_(2)–CH_(2))n–noligomers have been evidenced to have a major role in the friction *** simulation unveils that formation of chemical degradation products of castor oil on friction surfaces are favoured by the quantity of sp^(2)-hybridized carbon atoms in the amorphous carbon ***,tuning sp^(2)-carbon content in hydrogen-free amorphous carbon,in particular,on the top layers of the coating,provides an alternative way to control superlubricity achieved with castor oil and other selected green lubricants.

关键词： superlubricity diamond-like carbon(DLC) sp^(2)-hybridized carbon hydrogen passivation castor oil

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Mechanism of friction reduction of unsaturated fatty acids as additives in diesel fuels

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Friction 2013年第3期1卷 252-258页

作者： Jean Michel MARTIN Christine MATTA maria-isabel de barros bouchet Cyrielle FOREST Thierry Le MOGNE Thomas DUBOIS Michael MAZARIN Laboratory of Tribology and System Dynamics Ecole Centrale de Lyon69134 EcullyFrance TOTAL CReSBP2269360 Solaize CedexFrance

This paper investigates the effect of unsaturated fatty acid additives on the lubricating properties of a biodiesel,composed of a blend of fatty acid methyl esters(FAMEs)and a conventional diesel *** presence of fatty acids as additives for biodiesel improves their lubricating properties at elevated temperature *** formation of a protective lubricating tribochemical film on the steel contact surfaces has been *** temperature conditions and possibly oxygen are needed to form this film that reduces friction and limits *** analytical tools have revealed the insulating nature of the formed tribofilm and its chemical ***-induced reticulation is thought to play a major role in the growth of this insulating film.

关键词： biodiesel low friction fatty acids tribochemistry surface analysis

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