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| 1 | Lubricating a bright future:Lubrication contribution to energy saving and low carbon emission显示文摘Both the academic society and the industry are hunting for new energy forms for the future.However,the world should not forget the conventional technologies that contribute to the sustainable society by technical innovations.Among them,lubrication plays a significant role in energy saving and in low CO2emission by increasing the fuel efficiency and by prolonging the service life of machines.With the advance of novel synthetic approaches,and nanoscience and technologies,novel lubrication oils and additives and their formulations are being developed to reduce friction and wear,and novel surface treatment routes and surface coatings are invented and provide more efficient lubrication.These technologies create tremendous chances for machines to work more efficiently with low energy consumption.Here we review the recent progresses and challenges associated with some novel lubrication techniques that include novel surface treatment(such as texturing,high-performance nanocomposite coatings,adapting coating),tribology design(solid and liquid lubrication),energy-conserving engine oil and novel lubricants and formula(such as ionic liquids,low S,P content additives)which are to be adopted to enhance the fuel efficiency to achieve energy saving and low carbon emission.There is increased demand to replace fossil lubricants by degradable green lubricants.Specially designed coatings can reduce drag significantly during navigation of both airplanes and ships.All these aspects will be also reviewed in the paper. | CAI MeiRong GUO RuiSheng ZHOU Feng LIU WeiMin | 2013 | Science China(Technological Sciences)2013，56，12： | 22 |
| 2 | Leaf-surface wax of desert plants as a potential lubricant additive显示文摘Using an MFT-R4000 tester at room temperature,the leaf-surface wax of two desert plants,Ammopiptanthus mongolicus(AM)and Reaumuria soongorica(RS),was extracted and evaluated for its potential as a lubricant additive in polyalphaolefin(PAO)for steel-steel contact.Gas chromatography-mass spectrometry analysis was performed to identify the composition of the AM leaf-surface wax,and scanning electron microscopy and X-ray photoelectron spectroscopy were used to investigate its friction mechanisms.The results suggest that the leaf-surface wax could successfully reduce the friction and wear of steel-steel sliding pairs compared with PAO containing molybdenum dithiocarbamate additives.AM,in particular,showed high-performance wear resistance and friction-reducing properties.Its excellent tribological properties were attributed to the wax composition of leaf-surface fatty acids,alcohol,and esters. | Yanqiu XIA Xiaochun XU Xin FENG Guoxiong CHEN | 2015 | Friction2015，3，3： | 9 |
| 3 | Tribological and economic evaluation of recycled mineral lubricating oils显示文摘Seven kinds of used mineral lubricating oils,including hydraulic oils,film bearing oils,steam turbine oil and gear oils,were recycled by reclamation and adding additives.Physical and chemical properties of the recycled oils were measured and their lubrication performances were evaluated by the original and modified four-ball testers.Worn surfaces were analyzed by energy dispersive X-ray spectroscopy and Raman microscope.The recycling costs of burning,re-refined and refortified were estimated.Results showed that physical and chemical properties of the refortified oils were improved effectively and became in the industrial access standard.With the different friction materials under different loads,refortified oils provided excellent lubrication performances,much better than those of fresh oils.Because of additives replenished,the different lubrication films could form on the worn surfaces.A rough financial calculation revealed that the refortification process could produce the most economic value among the three methods. | LIU JianFang GU KaLi DUAN HaiTao ZHAO Yuan LI Jian | 2013 | Science China(Technological Sciences)2013，56，12： | 4 |
| 4 | Theory and contents of frictional mechanics显示文摘In this paper,we first discuss the development of the field of tribology,and highlight some of the main problems encountered in this area,such as lack of systematicness,loose correlation,and inadequate focus on the microscopic perspective.Then,we provide basic formulas of frictional mechanics while considering the friction effect on classical mechanics formulae.In order to carry out the frictional mechanics analysis,we first classify the interface.According to the size analysis of surface films,the manufacturing roughness of the surface,the contact width,and the roller radius of the rolling contact bearing,frictional mechanics has the features of interface mechanics,while interfaces are classified based on the presence or absence of a medium.Based on the classification,we further analyze the pressure and frictional stress of sliding and rolling friction problems without a medium,such as a slider,wedge key,and V belt.We also analyze problems with a medium,such as journal and rolling contact bearings.By comparing these results with those of classical mechanics without considering friction,we see that(1)friction causes deviations in the result for classical mechanics which does not consider friction,and(2)if the frictional stress and normal pressure affect each other,their interaction should be considered simultaneously.Finally,we summarize the friction problems,namely,sliding and rolling,with and without a medium,and deformed and non-deformed.From our analysis,we propose two conclusions.First,the frictional mechanics problem is a deviation of the classical mechanics problem,and secondly,frictional stress and normal pressure influence each other. | Ping HUANG Qianqian YANG | 2014 | Friction2014，2，1： | 3 |
| 5 | Effective sugar-derived organic gelator for three different types of lubricant oils to improve tribological performance显示文摘In this study,the gelling ability and lubrication performance of N-octadecyl-D-gluconamides(NOG)in liquid paraffin(LP),pentaerythritol oleate(PE-OA),and polyethylene glycol(PEG)oils were systemically investigated.The NOG,which could gelate the investigated oils,was successfully synthesized by a one-step method.The prepared gel lubricants were completely thermoreversible and exhibited improved thermal stability,according to the thermogravimetry analysis(TGA)reports.Rheological tests confirmed that the NOG gelator could effectively regulate the rheological behavior of the base oils.Tribological evaluation suggested that NOG,as an additive in the three types of base oils,could remarkably reduce the friction and wear in steel contacts.A plausible mechanism for the improved performances was proposed based on the mechanical strength of the gels and the formation of the boundary-lubricating film on the worn surface.The results indicated that NOG is a potential gelator for preparing gel lubricants with excellent tribological properties and environment-friendly characteristics. | Ruochong ZHANG Xuqing LIU Zhiguang GUO Meirong CAI Lei SHI | 2020 | Friction2020，8，6： | 2 |
| 6 | 添加纳米SnO_(2)颗粒纳米润滑油的摩擦学性能显示文摘将等质量分数(1%,2%,3%)纳米SnO_(2)颗粒和油酸加入到聚α-烯烃(PAO)基础油中制备纳米润滑油,采用往复滑动摩擦磨损试验研究了纳米润滑油在钢球-黄铜块摩擦副中的摩擦学性能,并与非纳米润滑油进行了对比,探讨了其减摩抗磨机理。结果表明:当使用含质量分数不低于2%纳米SnO_(2)颗粒的纳米润滑油润滑时,摩擦副的平均摩擦因数、黄铜表面磨痕宽度和深度均低于对应未添加纳米SnO_(2)颗粒润滑油润滑时;当纳米SnO_(2)颗粒的质量分数为2%时,纳米润滑油具有最佳的减摩抗磨性能,相比于PAO基础油润滑,摩擦副的平均摩擦因数、黄铜表面磨痕宽度和深度分别降低了31%,42%,50%;纳米润滑油优异的减摩抗磨性能归因于油酸形成的润滑膜和纳米SnO_(2)颗粒形成的保护层。 | 吴帆 王丙旭 胡明 杨金林 胡子瑞 崔威威 张宇 | 2022 | 机械工程材料2022，46，9： | 1 |
| 7 | Synergistic nano-tribological interaction between zinc dialkyldithiophosphate(ZDDP)and methyl oleate for biodiesel-fueled engines显示文摘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 lubricants.Such dilution of engine lubricants could be even more pronounced for CI engines running on higher blend concentrations of biodiesel.Given 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 oleate.These values are also observed to be lower than those measured for neat ZDDP and neat methyl oleate,respectively,under similar conditions.Subsequently,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 sliding.These energy values are approximated to be 2.6%and 28.9%(respectively)lower than that of the contact lubricated with neat ZDDP.It 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 lubrication.Thus,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 conjunctions.Such findings could prove to be essential in effectively formulating synergistic additive concentrations for engine lubricants used in biodiesel-fueled CI engines. | Siti Hartini HAMDAN Chiew Tin LEE Mei Bao LEE William Woei Fong CHONG Cheng Tung CHONG Suhaila Mohd SANIP | 2021 | Friction2021，9，3： | 0 |
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