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water-based lubrication of niobium nitride

Friction 2022年第6期10卷 842-853页

作者： Kaifei MIAO Jia WANG Qiang ZHAO Kaiwen WANG Mao WEN Kan ZHANG State Key Laboratory of Superhard Materials Department of Materials ScienceKey Laboratory of Automobile MaterialsMOEJilin UniversityChangchun 130012China Department of Materials Science and Engineering Jilin Jianzhu UniversityChangchun 130118China

water-based lubrication has attracted wide attention as an oil-free lubrication method owing to its greener and cleaner lubrication ***,due to operating in the water environment,most moving parts would inevitably suffer from abrasion,rusting,and aging *** a novel solid-water composite system with ultra-low friction and wear will open new possibilities for innovative lubrication material research and ***,we first revealed the water-based lubrication behavior of a high-hardness niobium nitride coating(NbN).In a three-phase contact environment(water,air,and NbN),oxidation and hydrolytic reactions of NbN result in the formation of"colloidal solutions",containing Nb_(2)O_(5)colloidal particles between the *** the double electric layer repulsion and weak shear action of the"colloidal solution",NbN achieves ultra-low friction and wear;the corresponding values are as low as 0.058 and 1.79×10^(-10)mm^(3)·N^(-1)·m^(-1),*** addition,other VB transition metal nitrides(VB TMNs)exhibit the same low friction feature as NbN in the three-phase contact environment;the friction coefficients are even lower than those in an oil-based *** water-based lubrication of VB TMNs provides a new reliable scheme for optimizing solid-water composite lubrication systems without additives and is expected to be applied in environments with high humidity or insufficient water coverage.

关键词： NbN water-based lubrication ultra-low friction ultra-low wear

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Plastic-elastic Model for water-based lubrication Considering Surface Force

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 208-218页

作者： Shuowen Zhang Mingbo Zhao Chenhui Zhang State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

water-based lubrication is an effective method to achieve superlubricity,which implies a friction coefficient in the order of 10−3 or *** numerical,analytical,and experimental studies confirm that the surface force effect is crucial for realizing water-based *** enhance the contribution of the surface force,soft and plastic materials can be utilized as friction pair materials because of their effect in increasing the contact area.A new numerical model of water-based lubrication that considers the surface force between plastic and elastic materials is developed in this study to investigate the effect of plastic flow in water-based *** the complexity of residual stress accumulation in lubrication problems,a simplified plastic model is proposed,which merely calculates the result of the dry contact solution and avoids repeated calculations of the plastic *** results of the two models show good *** deformation reduces the local contact pressure and enhances the function of the surface force,thus resulting in a lower friction coefficient.

关键词： Numerical model water-based lubrication Mixed lubrication Plastic model Superlubricity

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Lubricating properties of oil-in-water emulsion with low oil concentration:Competitive wetting effect

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Science China(Technological Sciences) 2013年第2期56卷 369-375页

作者： LIU ShuHai TAN GuiBin College of Mechanical and Transportation Engineering China University of Petroleum-Beijing

Oil-in-water （O/W） emulsions are widely used in metal working such as hot rolling and cutting. Three kinds of O/W emulsions with low oil concentration were prepared which include conventional emulsion （CE）, miniemulsion （MNE） and microemulsion （ME）. The lubricating properties of O/W emulsions with low oil concentration were investigated using the tribological testers and the thin film interferometry based on the relative optical interference intensity method. The tribological test results under boundary lubrication show that the friction coefficient and the total losing weight can be clearly seen： CE 〈 MNE 〈 ME. The lubricating film thicknesses under elastohydrodynarnic lubrication and thin film lubrication show that a relationship of the film formation abilities： CE 〉 MNE 〉 ME. Competitive wetting behavior of water and oil on solid surface was confirmed to play an important role in the film formation and tribological behaviors of O/W emulsion.

关键词： oil-in-water (O/W) emulsion water-based lubrication tribological properties lubricating film thickness competitivewetting

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Modification on the tribological properties of ceramics lubricated by water using fullerenol as a lubricating additive

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Science China(Technological Sciences) 2012年第9期55卷 2656-2661页

作者： LIU YuHong WANG XiaoKang LIU PengXiao ZHENG JunPeng SHU ChunYing PAN GuoShun LUO JianBin State Key Laboratory ofTribology Tsinghua UniversityBeijing 100084China Key Laboratory of Molecular Nanostructure and Nanotechnology Institute of ChemistryCASBeijing 100190China

It is necessary to modify the running-in process for the application of ceramics using water as a lubricant in real conditions because ceramics sliding in water are characterized by a running-in period with severe friction and ***,a kind of highly water-soluble nanoparticle,was synthesized and then used to ameliorate the tribological properties of Si 3 N 4 sliding against Al 2 O 3 in pure *** the addition of fullerenol,the running-in period was shortened from 30 min to 100 s at a speed of 250 mm/*** speed threshold above which ultralow friction can be obtained in a short time was expanded from 450 mm/s to 80 mm/***,the load-carrying ability of water film was *** role of fullerenol was discussed based on observation of the wear scar by an optical interferometer and XPS characterization of the tribo-film on the wear track.

关键词： water-based lubrication running.in ceramics water-soluble nanoparticle

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