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Synergistic nano-tribological interaction between zinc dialkyldithiophosphate(ZDDP)and methyl oleate for biodiesel-fueled engines

引用

Friction 2021年第3期9卷 612-626页

作者： siti hartini hamdan Chiew Tin LEE Mei Bao LEE William Woei Fong CHONG Cheng Tung CHONG Suhaila Mohd SANIP Bio-Engineering Technology Department University Kuala Lumpur Malaysian Institute of Chemical&Bioengineering Technology(UniKL MICET)Alor Gajah 78000Malaysia School of Mechanical Engineering Faculty of EngineeringUniversiti Teknologi Malaysia(UTM)Johor Bahru 81310Malaysia Automotive Development Centre(ADC) Universiti Teknologi Malaysia(UTM)Johor Bahru 81310Malaysia China-UK Low Carbon College Shanghai Jiao Tong UniversityShanghai 201306China Faculty of Engineering and Physical Sciences University of Southampton Malaysia(UoSM)Iskandar Puteri 79200Malaysia

In biodiesel-fueled compression-ignition(CI)engines,dilution by unburned biodiesel has been found to have adverse effects on the boundary lubrication properties of additives in fully formulated engine *** dilution of engine lubricants could be even more pronounced for CI engines running on higher blend concentrations of *** the nanoscopic nature of the interaction,this study seeks to determine the nano-tribological properties of an engine lubricant additive(e.g.,zinc dialkyldithiophosphate(ZDDP))when diluted with a fatty acid methyl ester(e.g.,methyl oleate).Using lateral force microscopy(LFM)together with a fluid imaging technique,the lowest nanoscopic friction forces and coefficient of friction values(0.068-0.085)were measured for ZDDP when diluted with 70 vol%of methyl *** values are also observed to be lower than those measured for neat ZDDP and neat methyl oleate,respectively,under similar ***,interpreting the data with the Eyring thermal activation energy approach,it could then be elucidated that the lower frictional losses observed for the contact lubricated with this volumetric mixture are a result of the lower potential energy barrier and activation energy required to initiate *** energy values are approximated to be 2.6%and 28.9%(respectively)lower than that of the contact lubricated with neat *** was also found that the mixture,at this volumetric concentration,possesses the highest possible pressure activation energy(load-carrying capacity)along with the lowest possible shear activation energy(shearing),potentially indicating optimum tribological conditions for boundary ***,the findings of this study suggest that an optimum concentration threshold exists in which a synergistic nano-tribological interaction between additives and fatty acid methyl esters can be attained,potentially reducing boundary frictional losses of lubricated *** findings could prove to be ess

关键词： boundary lubrication lateral force microscopy thermal activation energy methyl ester boundary additives

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