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Tribological behavior of nanocarbon materials with different dimensions in aqueous systems

Friction 2020年第1期8卷 29-46页

作者： Hongmei YANG Jiusheng LI Xiangqiong ZENG laboratory for advanced lubricating materials Shanghai Advanced Research InstituteChinese Academy of SciencesUniversity of Chinese Academy of SciencesShanghai 201210China

Due to the widespread use of nanocarbon materials(NCMs),more researchers are studying their tribological *** this work,the tribological behaviors of the following five types of NCMs with different geometric shapes were evaluated in a novel oil‐in‐water system:spherical fullerenes(C60,0D),tubular multi‐walled carbon nanotubes(MWCNT,1D),sheet graphene oxide(GO,2D),sheet graphene oxide derivative(Oct‐O‐GO,2D),and lamellar graphite(G,3D).Among these,GO with two types of oxidation degrees,i.e.,GO(1),GO(2),and Oct‐O‐GO(1)were synthesized and characterized using Fourier‐transform infrared spectroscopy,Raman spectroscopy,x‐ray diffraction,thermogravimetric analysis,scanning electron microscopy,and contact angle *** load‐carrying capacity of the NCM emulsions were evaluated using a four‐ball test machine,and the lubrication performances were investigated using a high‐frequency reciprocating friction and wear tester with a sliding distance of 1,800 mm under different loads(50 N and 100 N)at 0.5 *** results revealed that the Oct‐O‐GO(1)emulsion exhibited the best load‐carrying capacity,and the best friction‐reducing and anti‐wear properties compared to other ***,the anti‐wear advantage was more prominent under high load conditions,whereas the other emulsions exhibited a certain degree of abrasive or adhesive *** lubrication mechanism was determined through the analysis of worn surfaces using scanning electron microscopy/energy‐dispersive x‐ray spectroscopy,micro‐Raman spectroscopy,and x‐ray photoelectron *** results revealed that during frictional sliding,the ingredients in the emulsion can absorb and react with the freshly exposed metal surface to form surface‐active films to protect the surfaces from ***,it was found that the higher the amount of ingredients that contain alkyl and O‐H/C=O,the better was the lubrication performance in addition to an increase in the carbon residue in the tribofilm gener

关键词： nano‐carbon materials tribological behavior modified graphene oxide oil‐in‐water emulsion

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An overview of functional biolubricants

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Friction 2023年第1期11卷 23-47页

作者： Lumin YANG Xiaoduo ZHAO Zhengfeng MA Shuanhong MA Feng ZHOU State Key laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of materials Science and Optoelectronics Enginering University of Chinese Academy of SciencesBeijing 100049China Yantai Zhongke Research Institute of advanced materials and Green Chemical Engineering Yantai 264006China Shandong laboratory of Yantai advanced materials and Green Manufacture Yantai 264006China

At present,more and more diseases are associated with the lubrication dysfunction,which requires a systematic study of the complex lubrication behavior of tissues and organs in human *** biomacromolecular lubricants are essential for maintaining ultra-low coefficients of friction between sliding biological ***,when the surface lubrication performance of tissues or organs destroys heavily,it will bring friction/shear damage for sliding contact ***,the application of exogenous biological lubricating materials to improve the lubrication situation of damaged tissue or organ interfaces has attracted extensive attention of *** this review,based on a simple summary of lubrication mechanism at sliding biological interface,we systematically introduce the research progress of several kinds of representatively biolubrication materials,including eye drops,tissue anti-adhesion agents,joint lubricants,and medical device ***,the lubrication mechanism and individual advantage and shortcoming for each of these synthetic exogenous lubricated materials are ***,the important lubrication application functionality of these biolubricant materials in typically medical surgery scenes,such as dry eye syndrome,tissue adhesion,arthritis,and interventional medical devices,is ***,we look forward to the future development direction of artificial biolubricant materials.

关键词： biolubricants eye drops tissue anti-adhesion arthritis treatment medical devices

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Design and characterization of metallic glass/graphene multilayer with excellent nanowear properties

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Friction 2022年第11期10卷 1913-1926页

作者： Qing ZHOU Dawei LUO Dongpeng HUA Wenting YE Shuo LI Qiguang ZOU Ziqiang CHEN Haifeng WANG State Key laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China Songshan Lake materials laboratory Dongguan 523808China Institute of Physics Chinese Academy of SciencesBeijing 100190China

The excellent properties of metallic glass(MG)films make them perfect candidates for the use in miniature systems and ***,their high coefficients of friction(COFs)and poor wear resistance considerably limit their long-term performance in nanoscale *** report the fabrication of a MG/graphene multilayer by the repeated deposition of Cu_(50)Zr_(50) MG with alternating layers of *** microstructure of the multilayer was characterized by the transmission electron microscopy(TEM).Its mechanical and nanotribological properties were studied by nanoindentation and nanoscratch tests,respectively.A molecular dynamics(MD)simulation revealed that the addition of graphene endowed the MG with superelastic recovery,which reduced friction during *** comparison with the monolithic MG film,the multilayer exhibited improved wear resistance and a low COF in repeated nanowear tests owing to the enhanced mechanical properties and lubricating effect caused by the graphene *** work is expected to motivate the design of other novel MG films with excellent nanowear properties for engineering applications.

关键词： metallic glass(MG) multilayer nanowear properties molecular dynamics(MD)simulation

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Stable dispersibility of bentonite-type additive with gemini ionic liquid intercalation structure for oil-based drilling

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Friction 2023年第2期11卷 201-215页

作者： Chaoyang ZHANG Rui DONG Xingang WANG Yijing LIANG Ming ZHANG Qiangliang YU Zhongping TANG Huiying LV Liping WANG Meirong CAI Feng ZHOU Weimin LIU State Key laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100039China PetroChina Lanzhou lubricating Oil R&D Institute Lanzhou 730060China

In this study,the direct intercalation of gemini ionic liquids(ILs)with different alkyl chains into the bentonite(BT)interlayer as a high-performance lubricating additive for base oil 500SN was *** purpose of modifying BT with an IL is to improve the dispersion stability and lubricity of BT in lubricating *** dispersibility and tribological properties of IL–BT as oil-based additives for 500SN depend on the increase in interlamellar space in BT and improve as the chain length is *** importantly,the IL–BT nanomaterial outperforms individual BT in improving wear resistance,owing to its sheet layers were deformed and sprawled in furrows along the metal surface,thereby resulting in low surface *** of its excellent lubrication performance,IL-modified BT is a potential candidate for the main component of drilling *** can be used as a lubricating additive in oil drilling and oil well construction to reduce equipment damage and ensure the normal operation of equipments.

关键词： ionic liquid modified bentonite nanomaterial oil-based additive

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In-situ preparation of robust self-lubricating composite coating from thermally sprayed ceramic template

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Journal of advanced Ceramics 2023年第2期12卷 357-372页

作者： Zhichao WU Shuangjian LI Xiujuan FAN Florian VOGEL Jie MAO Xiaohui TU Institute of advanced Wear&Corrosion Resistant and Functional materials Jinan UniversityGuangzhou 510632China Institute of New materials Guangdong Academy of SciencesNational Engineering Laboratory of Modern Materials Surface Engineering TechnologyGuangzhou 510650China

The self-lubricating ceramic coatings that can control friction and wear have attracted researchers’widespread ***,the poor interfacial bonding between lubricants and ceramics and the deterioration of mechanical properties due to a tribological design limit their practical ***,a robust self-lubricating coating was fabricated by an in-situ synthesis of MoS_(2)/C within inherent defects of thermally sprayed yttria-stabilized zirconia(YSZ)*** edge-pinning by noncoherent endows hybrid coatings with excellent interfacial strength,increasing their hardness(HV)and cohesive ***,owing to the formation of a well-covered robust lubricating film at a frictional interface,a coefficient of friction(COF)can be reduced by 79.6%to 0.15,and a specific wear rate(W)drops from 1.36×10^(−3) to 6.27×10^(−7) mm^(3)·N^(−1)·m^(−1).Combining outstanding mechanical properties and tribological performance,the hybrid coating exhibits great application potential in controlling friction and ***,this strategy of introducing the target materials into the inherent defects of the raw materials to improve the relevant properties opens new avenues for the design and preparation of composite materials.

关键词： self-lubricating ceramic coatings thermal spray in-situ synthesis MoS_(2)/C friction and wear mechanical properties

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Mono-dispersed Ag nanoparticles decorated graphitic carbon nitride:An excellent lubricating additive as PPESK composite film

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Friction 2022年第5期10卷 717-731页

作者： Beibei CHEN Mengjie ZHANG Kan ZHANG Zhe DONG Jiaye LI Gai ZHAO School of materials and Science Engineering Institute for Advanced MaterialsJiangsu UniversityZhenjiang 212013China State Key laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Studies show that two dimensional(2D)nanomaterial and its hybrid have a great promise in tribology for the special laminar ***,the majority of performed investigations about 2D graphitic carbon nitride(g-C_(3)N_(4))nanosheets are most focused on energy storage,catalysis,adsorption,rarely *** the present study,g-C_(3)N_(4) supporting mono-dispersed Ag nanoparticle hybrid(g-C_(3)N_(4)/Ag)is prepared,and its microstructure and chemical composition are *** specifically,the tribological performance as the lubricating additive of poly phthalazinone ether sulfone ketone(PPESK)composite is investigated using the ball-on-disc friction ***,the corresponding enhancement mechanism is well proposed based on the experimental analysis and theoretical *** results show that Ag nanoparticles with a size of about 10-20 nm are homogeneously anchored on g-C_(3)N_(4) nanosheets,favoring for good compatibility between g-C_(3)N_(4)/Ag and *** is found that when 0.3 wt%of g-C_(3)N_(4)/Ag is added to PPESK,the friction coefficient and wear rate of PPESK decrease by 68.9%and 97.1%,*** reductions are mainly attributed to the synergistic self-lubricating effect of Ag nanoparticles and g-C_(3)N_(4) nanosheet,the formation of transfer film,as well as the limited effect of g-C_(3)N_(4)/Ag on the shear deformation of PPESK composite ***,it is found that the proposed g-C_(3)N_(4)/Ag-PPESK composite still keeps reasonable friction-reducing and wear-resistant properties under heavy loads and high rotating *** present study demonstrates that the proposed g-C_(3)N_(4)/Ag hybrid is an excellent lubricating additive for polymer composites.

关键词： g-C_(3)N_(4)/Ag hybrid poly phthalazine ether sulfone ketone(PPESK)composite film friction wear theoretical simulation

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Well-Dispersed Graphene Enhanced Lithium Complex Grease Toward High-Efcient Lubrication

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Chinese Journal of Mechanical Engineering 2023年第5期36卷 341-352页

作者： Kaiyue Lin Zhuang Zhao Yuting Li Zihan Zeng Xiaofeng Wei Xiaoqiang Fan Minhao Zhu Key laboratory of advanced Technologies of materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Tribology Research Institute School of Mechanical EngineeringSouthwest Jiaotong UniversityChengdu 610031China

Graphene as a lubricating additive holds great potential for industrial lubrication. However, its poor dispersity and compatibility with base oils and grease hinder maximizing performance. Here, the infuence of graphene dispersion on the thickening efect and lubrication function is considered. A well-dispersed lubricant additive was obtained via trihexyl tetradecyl phosphonium bis(2-ethylhexyl) phosphate modifed graphene ([P_(66614)][DEHP]-G). Then lithium complex grease was prepared by saponifcation with 12-OH stearic acid, sebacic acid, and lithium hydroxide, using polyalphaolefn (PAO20) as base oil and the modifed-graphene as lubricating additive, with the original graphene as a comparison. The physicochemical properties and lubrication performance of the as-prepared greases were evaluated in detail. The results show that the as-prepared greases have high dropping point and colloidal stability. Furthermore, modifed-graphene lithium complex grease ofered the best friction reduction and anti-wear abilities, manifesting the reduction of friction coefcient and wear volume up to 18.84% and 67.34%, respectively. With base oil overfow and afux, well-dispersed [P_(66614)][DEHP]-G was readily adsorbed to the worn surfaces, resulting in the formation of a continuous and dense graphene deposition flm. The synergy of deposited graphene-flm, spilled oil, and adhesive grease greatly improves the lubrication function of grease. This research paves the way for modulating high-performance lithium complex grease to reduce the friction and wear of movable machinery.

关键词： Graphene additive Lithium complex grease Dispersion Tribological properties

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Fabrication of high-stability Ni-PSF@PAO40 microcapsules and their lubricating properties in polyamide 6

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Friction 2022年第12期10卷 1985-1999页

作者： Wenli ZHANG Xiaowen QI Xiao YANG Yu DONG Bingli FAN Lei LIANG School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Key laboratory of Self-lubricating Spherical Plain Bearing technology of Hebei Province Yanshan UniversityQinhuangdao 066004China Aviation Key laboratory of Science and Technology on Generic Technology of Self-lubricating Spherical Plain Bearing Yanshan UniversityQinhuangdao 066004China School of Civil and Mechanical Engineering Curtin UniversityPerthWA 6845Australia Shanghai Research Institute of Synthetic Resins Co. Ltd.Shanghai 201702China

Novel Ni-PSF@PAO40 microcapsules(NPPMS)with high stability were prepared by using a combined processing method of electroless nickel plating and solvent *** results indicate that Ni is completely assembled on the surfaces of PSF/PAO40 microcapsules with the encapsulation capacity of NPPMS achieved at 50%.Organic solvents immersion shows that NPPMS have an excellent chemical *** thermal stability tests reveal that the softening temperature of NPPMS is increased up to over 400℃ while it becomes lower than 200℃ for PSF/PAO40 ***,NPPMS were embedded into polyamide 6(PA6)to prepare PA6/NPPMS *** cross-sectional morphology shows that NPPMS are intact in PA6 *** microhardness of PA6 is effectively improved with the incorporation of *** compared with neat PA6,the coefficient of friction(COF)for PA6/NPPMS composites with 10%NPPMS could be reduced by 87.7%(from 0.49 to 0.06)and the wear rate could be decreased by 96.8%(from 1.29×10^(-5) to 4.15×10^(-7) mm^(3)/(N·m)).Further studies confirmed that increasing test loads and test temperatures was beneficial to improve the lubrication performance of NPPMS despite the opposite trend occurred when increasing the sliding *** has been demonstrated that synergistic effects between PAO40 and Ni layer play an important role in improving the tribological properties of ***,NPPMS significantly improve the ability of microcapsules to resist a harsh environment,which has important scientific significance for expanding the use of microcapsules more practically in self-lubricating composites.

关键词： microcapsules electroless nickel high temperature resistant polyamide 6(PA6) friction and wear

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Ultralow-adhesion icephobic surfaces:Combining superhydrophobic and liquid-like properties in the same surface

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Nano Research 2023年第1期16卷 589-598页

作者： Mengling Ouyang Ruisheng Guo Yue Fan Yi Zhou Chengjiao Wu Liwei Chen Shilin Huang Xuelin Tian School of materials Science and Engineering State Key Laboratory of Optoelectronic Materials and TechnologiesKey Laboratory for Polymeric Composite&Functional Materials of Ministry of EducationGuangzhou Key Laboratory of Flexible Electronic Materials and Wearable DevicesSun Yat-sen UniversityGuangzhou 510006China

As a ubiquitous natural phenomenon,ice/frost formation on solid surfaces have adverse effects on many commercial and residential *** surfaces feature low ice adhesion strengths(lubricating surfaces are two prevailing categories of icephobic ***,their long-term stability is relatively poor,and the ice adhesion strengths are not low enough for passive removal of small ice crystals(e.g.,frosts)from the ***,we combine the superhydrophobic and liquid-like properties in one surface to obtain durable icephobic surfaces with extremely low ice adhesion strengths(about 0.035 kPa).Ices and frosts can be removed from the surface under the action of gravity or gas *** surfaces are prepared based on surface nanoconical structure and covalently-grafted liquid-like perfluorinated polyether(PFPE)coating,which show synergy effects on suppressing icing and frosting by promoting expulsion of subcooled condensate droplets from the nanotexture and decreasing ice adhesion *** icephobic surfaces show significantly better durability compared to lubricant-impregnated textured *** results provide a new avenue to design passive anti-icing/anti-frosting surfaces for a wide range of applications where surfaces are exposed to humid and low-temperature environments.

关键词： icephobic superhydrophobic liquid-like anti-frosting anti-icing

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Tribological performance of hydrogenated diamond-like carbon coating deposited on superelastic 60NiTi alloy for aviation selflubricating spherical plain bearings

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Chinese Journal of Aeronautics 2022年第12期35卷 309-320页

作者： Yefei ZHOU Zhihao CHEN Zhonghui HU Lei LI Qingxiang YANG Xiaolei XING College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China State Key laboratory of Metastable materials Science&Technology Yanshan UniversityQinhuangdao 066004China Aviation Key laboratory of Science and Technology on Generic Technology of Self-lubricating Spherical Plain Bearing Yanshan UniversityQinhuangdao 066004China AVIC the First Aircraft Institute Xi’an 710089China Northwest Institute for Nonferrous Metal Research Xi’an 710016China

It is imperative to develop a novel matching of metallic substrate and self-lubricating coating for aircraft spherical plain bearing in a wide range of service *** a new type of superelastic material,60NiTi alloy meets the performance requirements of aerospace bearing materials,but exhibits poor tribological performance,especially under the conditions of dry sliding friction.A Hydrogenated Diamond-Like Carbon(H-DLC)coating was deposited on the 60NiTi alloy to improve its tribological *** microstructure and mechanical behavior of the 60NiTi alloy and its H-DLC coating were *** show that improvement of friction and wear performance of the H-DLC coating deposited on the 60NiTi substrate is mainly achieved by graphitization at the friction interface and the transfer film produced on the counterpart *** increased friction load leads to intensification of graphitization at the friction interface and formation of continuous and compact transfer film on the surface of the counterpart ball.

关键词： 60NiTi Diamond-Like Carbon(DLC)coating Graphitization Transfer film Tribology

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