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Science China(Technological Sciences) 2016年第5期59卷 689-698页

作者： XIE HongMei JIANG Bin WANG QingHang XIA XiangSheng PAN FuSheng College of Materials Science and Engineering National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China Institute of Condensed Matter Physics College of Physics and Electronic Engineering Yangtze Normal University Chongqing 408100 China Chongqing Academy of Science and Technology Chongqing 401123 China No.59 Institute of China Ordnance Industry Chongqing 400039 China

The tribological properties of combinative addition of nano-MoS2 and nano-SiO2 to the base oil have been investigated with a reciprocating ball-on-plate tribotester for magnesium alloy-steel contacts. The results demonstrate that the optimum mass ratio of nano-SiO2 to nano-MoS2 is 0.25：0.75. The optimum combinative addition into the base oil reduces the friction coefficient by 43.8% and the surface roughness （Sa） by 31.7% when compared to that found with the base oil. Meanwhile, the combinative addition of nano-MoS2 and nano-SiO〉 in comparison with single nanoparticles addition, is more pronounced in terms of the lubrication film stability. The excellent tribological properties of the SiO2/MoS2 combinations are attributed to the formation of physical adsorption films and tribochemical products during the rubbing process and the micro-cooperation of various nano- particles with different shapes and lubrication mechanisms.

关键词： nano-MoS2 nano-Si02 lubricant additive tribological properties magnesium alloy

Synthesis and surface modification of the nanoscale cerium borate as lubricant additive

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Journal of Rare Earths 2011年第11期29卷 1095-1099页

作者：孔令同胡华王天友黄定海付建建 Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and EngineeringTianjin University State Key Laboratory of Engines Tianjin University

Nanoparticle of cerium borate with a size of about 50 nm was synthesized via sol-gel precipitation method under micro-emulsion by oleic acid,using Na2B4O7 and Ce（NO3）3 aqueous solution as raw materials,and the morphology and microstructure of as-prepared particles were characterized by means of scanning electron microscopy（SEM） equipped with an energy-dispersive X-ray spectrometer（EDS）,X-ray diffraction（XRD）,infrared spectroscopy（IR）,and thermogravimetric analysis（TGA）.Two methods to disperse the particles into base oil were employed,and the results derived from the four-ball tribotester indicated that the friction coefficient of the base oil by the addition of the nanoscale cerium borate particles diminished greatly,and the anti-wear properties also depended on the dispersion methods.

关键词： cerium borate lubricant additive nanoparticle sol-gel precipitation dispersion methods rare earths

Leaf-surface wax of desert plants as a potential lubricant additive

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Friction 2015年第3期3卷 208-213页

作者： Yanqiu XIA Xiaochun XU Xin FENG Guoxiong CHEN School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing 102206China Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of SciencesLanzhou 730000China

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 *** 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 *** 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 ***,in particular,showed high-performance wear resistance and friction-reducing *** excellent tribological properties were attributed to the wax composition of leaf-surface fatty acids,alcohol,and esters.

关键词： leaf-surface wax Ammopiptanthus mongolicus lubricant additive friction and wear

Preparation and Tribological Properties of Cu-doped Muscovite Composite Particles as lubricant additive

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Chemical Research in Chinese Universities 2017年第3期33卷 430-435页

作者： DU Pengfei CHEN Guoxu SONG Shiyuan ZHU Dachuan WU Jiang CHEN Peng CHEN Hanlin Department of Oil Application & Management Engineering Logistical Engineering University PLA Chongqing 401311 P. R. China College of Materials Science and Engineering Sichuan University Chengdu 610064 P. R. China Chongqing Energy College Chongqing 402260 P. R. China

Cu-doped muscovite（Mu） composite particles, abbreviated as Mu/Cu, were prepared via liquid phase reduction method. The morphologies, phase composition and elementary distribution of the as-prepared Mu/Cu and raw muscovite particles were characterized by means of scalmmg electron microscope（SEM）, X-ray diffraction（XRD） and energy dispersive spectrometry（EDS）. The tirbological properties of Mu/Cu and Mu as lubricant additives in lithium grease were evaluated on a block-ring tribomachine. The roughness, 2D and 3D morphologies and elementary distribution of block worn surface were analyzed to explore the tribogical mechanism. The results show that muscovite are evenly coated by the cubic Cu nanoparticles in composite particles. Both Mu/Cu and Mu can effectively improve the tirbological properties of lithium grease and Mu/Cu exhibits better tribological performance than Mu. The friction coefficient of Mu/Cu is decreased by 69.2% as compared to that of lithium grease. The layer structure of muscovite is synergistic with Cu nanoparticles in contribution to the formation of lubricant film mainly consisting of O, Si, Fe, Cu as well as Al elements on the block worn surface thereby further reducing the friction and wear.

关键词： Muscovite Cu nanoparticle lubricant additive Friction-reducing and anti-wear

Characterizing a lubricant additive for 1,3,4-tri-(2-octyldodecyl) cyclopentane: Computational study and experimental verification

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Friction 2016年第3期4卷 257-265页

作者： Jingyan NIAN Yifan SI Zhiguang GUO Ping GAO Weimin LIU State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 ChinaHubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei University Wuhan 430062 China

In order to increase the life of spacecraft, it is important to improve the comprehensive lubrication performance. Multiple alkylated cyclopentane (MAC) lubricants are presently gaining wide acceptance for actual space applications; adding extreme pressure additive is a strategy to improve lubrication performance. In this study, taking 1,3,4-tri-(2-octyldodecyl) cyclopentane as base oil, tricresol phosphate (traditional additive) and tri-(2-octyldodecyl) phosphate (developmental additive) have been screened computationally for compatibility, shear film forming and energy dissipation. Theoretical results indicate that (a) tricresol phosphate additive is not suited for addition to 1,3,4-tri-(2-octyldodecyl) cyclopentane lubricant due to limited compatibility; (b) tri-(2-octyldodecyl) phosphate is an excellent lubricant additive due to its perfect compatibility, ease of forming a shear film on the surface of friction pairs, higher strength, and low energy dissipation; and (c) lubrication occurs through the solid-liquid composite lubrication mechanism. These theoretical results were confirmed experimentally.

关键词： 1,3,4-tri-(2-octyldodecyl) cyclopentane lubricant additive computational screening lubrication mechanism experimental verification

Study of tribological properties and lubrication mechanism of surfactant-coated anthracite sheets used as lubricant additives

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Friction 2021年第3期9卷 524-537页

作者： Hailong LIU Yajing HUANG Yaozhu WANG Xiaomin ZHAO Danqing CHEN Guohua CHEN College of Chemical Engineering Huaqiao UniversityXiamen 361000China College of Materials Science and Engineering Huaqiao UniversityXiamen 361000China

Anthracite sheets were coated by sorbitol fatty acid ester(span80)through ball-milling *** tribological properties of the span80-coated anthracite sheets as the additive in polyalpha olefin were evaluated through a series of friction tests using a four ball *** results revealed that the span80-coated anthracite sheets exhibited excellent dispersion stability in base *** addition,compared with base oil,the average coefficient of friction,wear scar diameter,and wear volume of modified oil at a mass fraction of 0.03%span80-coated anthracite sheets decreased by 45.39%,60.13%,and 95.95%,*** oil containing span80-coated anthracite sheets achieved good friction-reducing and anti-wear effects over a wide range of applied loads,temperatures,or rotating *** experiments were performed as *** results obtained using span80-coated anthracite sheets were superior to those obtained using pure *** lubrication mechanism was attributed to the synergistic action of the crystalline and amorphous carbon in anthracite sheets as they formed a protective film and played a mitigative role on the surface of friction pair,which mitigated the wear extent of the friction pair.

关键词： anthracite tribological properties lubricant additive protective film-mending effect

Tribological properties of novel palygorskite nanoplatelets used as oil-based lubricant additives

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Friction 2021年第2期9卷 332-343页

作者： Kunpeng WANG Huaichao WU Hongdong WANG Yuhong LIU Lv YANG Limei ZHAO School of Mechanical Engineering Guizhou UniversityGuiyang 550025China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Layered palygorskite(PAL),commonly called attapulgite,is a natural inorganic clay mineral composed of magnesium *** this study,an aqueous miscible organic solvent treatment method is adopted to prepare molybdenum-dotted palygorskite(Amo-PMo)nanoplatelets,which greatly improved the specific surface area of PAL and the dispersion effect in an oil-based lubricant *** layered structure and size were confirmed using transmission electron microscopy(TEM)and atomic force *** a tribological test lubricated with three additives(PAL,organic molybdenum(SN-Mo),and Amo-PMo),it was found that the sample of 0.5 wt%Amo-PMo exhibited the best tribological properties with a coefficient of friction of ***,the resulting wear scar diameter and wear volume of the sliding ball surface were 63%and 49.6%of those lubricated with base oil,*** excellent lubricating performance and self-repairing ability were mainly attributed to the generated MoS2 adsorbed on the contact surfaces during the tribochemical reaction,thereby effectively preventing the direct collision between asperities on sliding solid ***,as-prepared Amo-PMo nanoplatelets show great potential as oil-based lubricant additives,and this study enriches the existing application of PAL in industry.

关键词： palygorskite(PAL) layered material lubricant additive wear tribofilm

Lubricating performances of graphene oxide and onion-like carbon as water-based lubricant additives for smooth and sand-blasted steel discs

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Friction 2020年第1期8卷 47-57页

作者： Fenghua SU Guofu CHEN Ping HUANG School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510641China

Graphene oxide(GO)nanosheets and onion‐like carbon(OLC)nanoparticles were synthesized from natural graphite powder and candle soot,respectively,and characterized by transmission electron microscopy and Raman *** lubricating performances of GO and OLC as lubricant additives in water were comparatively evaluated using a ball‐on‐disc *** effects of sand blasting of a steel disc on its morphology and tribological property were *** results show that the two nanomaterials,GO and OLC,when used as lubricant additives in water effectively reduce the friction and wear of the sliding discs,which is independent of the disc surface *** applying heavy loads,it is observed that GO exhibits superior friction‐reducing and anti‐wear abilities compared to those of OLC—a trace amount of GO can achieve a lubricating ability equivalent to that of an abundant amount of ***,it is observed that sand blasting cannot improve the wear resistance of the treated steel disc,even though the hardness of the disc increased after the *** possible anti‐wear and friction‐reducing mechanisms of the GO and OLC as lubricant additives in water are discussed based on results for the wear surfaces obtained by scanning electron microscopy,Raman spectroscopy,and X‐ray photoelectron spectroscopy。

关键词： graphene oxide onion‐like carbon lubricant additive friction and wear

Investigation on tribological behaviors of MoS2 and WS2 quantum dots as lubricant additives in ionic liquids under severe conditions

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Friction 2020年第4期8卷 674-683页

作者： Kuiliang GONG Wenjing LOU Gaiqing ZHAO Xinhu WU Xiaobo WANG State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Qingdao Center of Resource Chemistry&New Materials Qingdao 266000China

Despite excellent tribological behaviors of ionic liquids (ILs) as lubricating oils, their friction-reducing and anti-wear properties must be improved when they are used under severe conditions. There are only a few reports exploring additives for ILs. Here, MoS2 and WS2 quantum dots (QDs, with particle size less than 10 nm) are prepared via a facile green technique, and they are dispersed in 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIm]PF6), forming homogeneous dispersions exhibiting long-term stabilities. Tribological test results indicate that the addition of MoS2 and WS2 QDs in the IL can significantly enhance the friction-reducing and anti-wear abilities of the neat IL under a constant load of 500 N and a temperature of 150 °C. The exceptional tribological properties of these additives in the IL are ascribed to the formation of protective films, which are produced not only by the physical absorption of MoS2 and WS2 QDs at the steel/steel contact surfaces, but also by the tribochemical reaction between MoS2 or WS2 and the iron atoms/iron oxide species.

关键词： MoS2 and WS2 quantum dots ionic liquids lubricant additive friction reduction and anti-wear severe conditions

Research progresses of nanomaterials as lubricant additives

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Friction 2024年第7期12卷 1347-1391页

作者： Zhengquan JIANG Yankun SUN Bokang LIU Laigui YU Yuping TONG Mingming YAN Zhongzheng YANG Yongxing HAO Linjian SHANGGUAN Shengmao ZHANG Weihua LI School of Materials Science and Engineering North China University of Water Resources and Electric PowerZhengzhou 450045China Institute of Special Friction and Lubricating Materials North China University of Water Resources and Electric PowerZhengzhou 450045China Nanomaterials Engineering Research Center Henan UniversityKaifeng 475001China School of Mechanical Engineering North China University of Water Resources and Electric PowerZhengzhou 450045China

Friction and wear are unavoidable in mechanical *** use of lubricants with nano-additives can effectively reduce friction and wear,which is of great significance to saving energy and protecting the *** present,great progress has been made in the scientific research and industrial application of nano-additives for *** paper mainly introduces the types of nano-additives for lubricants(such as carbon nanomaterials,nano-metals,nano-oxides,sulfides,complexes,polymers,etc.),the tribological properties of lubricants with different components of nano-additives,and the lubrication mechanisms of the nano-additives(including tribofilm formation,rolling ball bearing effect,repairing effect,polishing effect,and synergistic effect).It also deals with the dispersion of nano-additives in lubricants and the influences of their particle size and microstructure on the tribological properties of *** review outlines the performance requirements of nano-additives in different lubrication states,discusses the use of nano-additives in challenging working conditions,and identifies various industrial oil nano-additives with reference to the appropriate options in diverse working ***,the existing problems of nano-additives and their application prospects are *** review,hopefully,would help to shed light on the design and synthesis of novel high-performance nano-additives and promote their application in engineering.

关键词： nanomaterials lubricant additive lubrication mechanism research progress