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Superlubricity by polyimide-induced alignment

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Friction 2023年第9期11卷 1690-1707页

作者： Xinlei GAO Hao CHEN Hong YAN Chengrui HUANG Li WU Tingting WANG School of Materials Science and Engineering Hubei UniversityWuhan 430062China School of chemical and Environmental Engineering Wuhan Polytechnic UniversityWuhan 430023China State Key Laboratory of chemical Resource Engineering College of ChemistryBeijing University of Chemical TechnologyBeijing 100029China School of Chemistry and Environmental Engineering Wuhan Institute of TechnologyWuhan 430074China

We have investigated the lubrication alignment behavior of point–plane contact and plane–plane contact between the GCr15 steel and polyimide(PI)friction pair using nematic liquid crystals(LCs)as the *** this system,rubbing orients the macromolecular PI molecules,and the oriented PI molecules induce alignment of the LC molecules in contact with or close to the oriented PI *** LC molecules are aligned in the wear scar grooves of the PI film,and alignment extends to the GCr15-steel *** of the LC molecules is correlated with the strong interaction force between the PI and LC molecules,the stable coordination structure of the LCs and GCr15 steel,and the weak interaction between the LC *** performed simulations of the pretilt angle of PI and LCs and discussed the relationship between the pretilt angle and the friction *** to the small pretilt angle between PI and the LCs,the LC molecules orient almost parallel to the PI material,which is beneficial for superlubricity of this type of friction system.

关键词： superlubricity polyimide liquid crystal alignment

Shape controlled synthesis and tribological properties of CeVO_4 nanoparticles as lubricating additive

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Journal of Rare Earths 2011年第7期29卷 688-691页

作者：刘凤珍邵鑫尹贻彬赵利民邵珠伟刘雪华孟宪华 College of Materials Science and Engineering Liaocheng University State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Renewable Energy & Environment Materials Engineering Center Liaocheng University

Shape controlled structure of CeVO4 nanocrystals were successfully synthesized via a hydrothermal method from Na3VO4·12H2O and Ce（NO3）3·6H2O. The resulting products were characterized by X-ray powder diffraction （XRD）, electron microscopy （SEM） and other techniques. On the basis of the experimental results, CeVO4 nanoparticles exhibited the crystal tetragonal structure and the pH value of solu-tion had an important effect on the crystal structure and morphology of CeVO4 nanoparticles. Furthermore, the tribological properties of CeVO4 nanoparticles as additives in liquid paraffin were evaluated on a four-ball tester. The results indicated that the wear resistance was im-proved by the additive CeVO4 nanoparticles which exhibited very good antiwear and friction reduction performance in wear.

关键词： CeVO4 nanoparticles tribological properties additives liquid paraffin rare earths

Synthesis of tetrathiafulvalene C_(60)Br_n and their Langmuir films

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chinese Science Bulletin 1996年第7期41卷 571-573页

作者：肖玉方 lanzhou institute of chemical physics Chinese Academy of Sciences Lanzhou 730000 China

Buckminsterfullerene (C60) was found to be the third form of carbon in 1985. Themethod for the macroscale synthesis of C60 has been developed successfully. C60 has at-tracted great attention owing to its particular physical and chemical properties. Obeng et al. reported the molecular behavior of C60 at the air-water interface andfound that it was difficult to obtain good quality LB films. It arose from its rigidityand hydrophobicity. We found that C60Brn could form stable mononlayers at

关键词： tetrathiafulvalene C60 Langmuir.

Selective synthesis and growth mechanism of CeVO_4 nanoparticals via hydrothermal method

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Journal of Rare Earths 2011年第2期29卷 97-100页

作者：刘凤珍邵鑫尹贻彬赵利民孙巧珍邵珠伟刘雪华孟宪华 College of Materials Science and Engineering Liaocheng University State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of Sciences Renewable Energy & Eco-Materials Engineering Center Liaocheng University

Selective-controlled structure and shape of CeVO4 nanocrystals were successfully synthesized via a hydrothermal method from Na3VO4·12H2O and Ce（NO3）3·*** resulting products were characterized by X-ray powder diffraction （XRD）,field emission scanning electron microscopy （FESEM） and energy dispersive spectroscopy （EDS）.The influence of hydrothermal temperature,precursor solution concentration on the crystal and morphology of products were further *** results showed that the as-synthesized products exhibited pure single-crystal CeVO4 nanoparticles with tetragonal *** hydrothermal temperature and precursor solution concentration had important effects on the formation of CeVO4 ***,the growth mechanism of CeVO4 nanoparticles was explained with Ostwald ripening mechanism.

关键词： CeVO4 hydrothermal method temperature precursor solution concentration Ostwald ripening mechanism rare earths

二聚酸离子液体作为水基润滑添加剂的摩擦学性能研究

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摩擦学学报 2025年第12期44卷 1739-1751页

作者：张铭建陈云龙李维民程顺峰青岛农业大学生命科学学院山东青岛 266041 中国科学院兰州化学物理研究所固体润滑国家重点实验室甘肃兰州 730000 淄博高端合成润滑材料创新中心山东淄博 255000

以不同链长的二元脂肪酸作为阴离子，以二异丙醇胺作为阳离子，合成了4种羧酸铵型离子液体(CAILs)，并研究了其作为水-二乙二醇(WDG)添加剂的溶解性和摩擦学性能，随后采用光学显微镜(OM)、扫描电子显微镜(SEM)、聚焦离子束-透射电子显... 详细信息

以不同链长的二元脂肪酸作为阴离子，以二异丙醇胺作为阳离子，合成了4种羧酸铵型离子液体(CAILs)，并研究了其作为水-二乙二醇(WDG)添加剂的溶解性和摩擦学性能，随后采用光学显微镜(OM)、扫描电子显微镜(SEM)、聚焦离子束-透射电子显微镜(FIB-TEM)、石英晶体微天平(QCM)和X射线光电子能谱(XPS)对试验后的磨痕进行二维形貌的观察和化学组成的分析. 结果表明：4种离子液体在水-二乙二醇中有良好的溶解性(>4.0%，质量分数)和稳定性. 此外，4种离子液体都能增强WDG的减摩性能，但只有二聚酸离子液体(DC36-DIPA)增强了WDG的抗磨性能，同时提高了WDG的承载能力(500 N)，表现出最佳的摩擦学性能. OM、SEM、FIB-TEM、QCM和XPS结果表明：质量分数0.5% DC36-DIPA在钢-钢摩擦副表面生成了厚度约为60~70 nm、以铁氧化物为主要成分的摩擦膜，这层摩擦膜通过DC36-DIPA分子在金属表面的吸附以及润滑剂与摩擦副之间的摩擦化学反应而形成，起到减摩抗磨的作用.

关键词：离子液体吸附摩擦化学反应润滑机制

ROLLING CONTACT FATIGUE BEHAVIOR OF CERAMIC BALLS LUBRICATED BY LUBRICANTS WITH EXTREME PRESSURE ADDITIVES

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chinese Journal of Mechanical Engineering 2006年第2期19卷 195-199页

作者： ZHANG Feng S0NG Baoyu QU Jianjun LIU Weimin School of Mechatronics Engineering Harbin Institute of TechnologyHarbin 150001 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000 China

An experiment is conducted to investigate the effects of lubricant10#, which contains extreme pressure additives T304 and T305, on the rolling contact fatigue （RCF） life of the contact pairs of a Si3N4 ceramic ball and a steel rod. The experimental investigation is carried out using a ball-rod RCF test rig. The results show that the extreme pressure additives increase the anti-contact-fatigue performance of ceramic balls; When the content of the additives varies from 1% to 5%, the increasing gradient of the RCF life curve decreases; And the oil sample with 1% T305 additive corresponds to the maximal gradient of the RCF life curve, with the RCF life being increased by about 10.77 times. The fatigue surface of the ceramic ball is analyzed with scanning electron microscope （SEM） and X-ray electron dispersion analysis（EDAX）, and the physical model of extreme pressure additives＇ increasing the RCF life of the ceramic ball is proposed. It is found that the extreme pressure additives form a corrosive film and a transfer film on the surface of the ceramic ball, which decrease the surface tangential stress, and to increase the surface energy is the most effective means for increasing the RCF life.

关键词： Ceramic bearing Si3N4 ceramic Rolling contact fatigue Extreme pressure additive

Effect of functional groups on tribological properties of lubricants and mechanism investigation

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Friction 2023年第6期11卷 911-926页

作者： Hongxiang YU Haijie CHEN Zhiwen ZHENG Dan QIAO Dapeng FENG Zhenbin GONG Guojun DONG State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China

Nine organic compounds were utilized as model lubricants to investigate the impact of functional groups on tribological *** Acid with carboxyl showed the best lubrication properties,and fluid film and tribofilm were coexistent in its friction test,bringing a low friction coefficient and wear *** addition,the lubricant with low friction coefficient corresponded to high adsorption energy in density functional theory(DFT)*** the lubricant forming adsorption film with large surface energy displayed small wear rate in friction ***,adsorption energies positively correlated surface *** on the experimental results,the action mechanism of functional groups on tribological properties of lubricants was *** functional groups make lubricant molecules show different adsorption energies and surface *** molecules with high adsorption energy are more likely to adsorb on substrates and form a vertical monolayer,which can maintain a regular molecular brush structure during friction and bring a low friction *** lubricant molecules with high surface energy may be more prone having tribochemical reactions during friction and forming protective tribofilm,which leads to a low wear rate.

关键词： functional group tribological property adsorption energy surface energy action mechanism

NP油溶性离子液体添加剂的制备及其结构对摩擦学性能影响

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摩擦学学报 2025年第12期44卷 1707-1719页

作者：王玉荣谢经堂郭斌张朝阳于强亮蔡美荣郭峰青岛理工大学机械与汽车工程学院山东青岛 266520 中国科学院兰州化学物理研究所固体润滑国家重点实验室甘肃兰州 730000 新疆工程学院化学与环境工程学院新疆乌鲁木齐 830023 烟台先进材料与绿色制造山东省实验室山东烟台 264006

制备了2种新的磷酸季铵离子液体N22216P和N12121216P，研究了这2种离子液体(ILs)的溶解性能、黏温性能、热稳定性能和防腐性能，探究了室温和高温下它们作为PAO10润滑添加剂的摩擦学性能，并分析了ILs的结构对其润滑性能的影响. 结果发... 详细信息

制备了2种新的磷酸季铵离子液体N22216P和N12121216P，研究了这2种离子液体(ILs)的溶解性能、黏温性能、热稳定性能和防腐性能，探究了室温和高温下它们作为PAO10润滑添加剂的摩擦学性能，并分析了ILs的结构对其润滑性能的影响. 结果发现，质量分数为1%的N22216P和N12121216P表现出比1%商业添加剂T204更优异的润滑性能. 根据电接触电阻、石英晶体微天平测量、能谱和X射线光电子能谱表征结果，推测这2种ILs在摩擦过程中易吸附在基底表面形成吸附膜，这有助于在钢表面发生摩擦化学反应形成摩擦保护膜，从而起到减摩抗磨作用. 此外，还发现：室温和高温润滑下，具有较低空间位阻结构的ILs更易吸附在基底上形成更致密的吸附膜并进一步在钢表面发生反应形成更多的含有抗磨化合物的更致密的润滑膜，因此，空间位阻较小的N22216P具有更优异的润滑性能，这表明ILs作为基础油添加剂的润滑性能受空间位阻结构的影响.

关键词：润滑添加剂离子液体润滑性能磨损润滑机理

The rheological and tribological properties of calcium sulfonate complex greases

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Friction 2015年第1期3卷 28-35页

作者： Zeyun WANG Yanqiu XIA Zhilu LIU School of Chemistry and chemical Engineering Ningxia UniversityYinchuan750021China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing210094China

In this study,we synthesized two types of calcium sulfonate complex greases(barium soap and calcium soap)and investigated their physical,rheological,and tribological properties in *** test results showed that the evolution of their linear viscoelasticity functions with frequency were quite similar to those of traditional lubricating ***,these two calcium sulfonate complex greases had good friction-reducing and antiwear properties at room temperature and at 150°*** addition,by adding an organic molybdenum compound(MoDTC)to the base greases,we obtained a very low friction coefficient(0.065)for one of the greases(calcium soap)at 400 N and 500 N(maximum Hertzian pressures of 3.47 GPa and 3.74 GPa,respectively)at 150°C.X-ray photoelectron spectroscopy(XPS)analysis showed that the tribofilm was composed of some complex oxide species and CaCO3 that had formed on the worn surface.

关键词： calcium sulfonate complex greases tribological properties rheology viscoelasticity