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摩擦（英文）
摩擦（英文）

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2223-7690

摩擦（英文）/Journal FrictionCSCDCSTPCD北大核心EISCI
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    Review of tribological properties of nanoparticle-based lubricants and their hybrids and composites

    Ye Zar Ni HTWEAws.S.AL-JANABIYasmin WADZERHussin MAMAT...
    569-590页
    查看更多>>摘要：Due to their encouraging results,nanolubricants have been revolutionary in the field of lubrication.The degree,to which the new material may improve the tribology,energy savings,and durability,is a crucial consideration for any new additive to a conventional lubricant.The results of the earlier research on carbon,metal,metal oxide,and their composites and hybrid nanolubricants as well as their effects on tribology,are summarized in this review paper.The most popular measuring methodologies,the tribology results for lubricants with an oil base,biodegradable base,and a water base,as well as the reasons that explain these tribological advancements,are all included in this study.Finally,prospects for more study in this area are emphasized.
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    Hydration lubrication modulated by water structure at TiO2-aqueous interfaces

    Pingsu MAYuan LIUKe HANYu TIAN...
    591-605页
    查看更多>>摘要：The nature of solid-liquid interfaces is of great significance in lubrication.Remarkable advances have been made in lubrication based on hydration effects.However,a detailed molecular-level understanding is still lacking.Here,we investigated water molecule behaviors at the TiO2-aqueous interfaces by the sum-frequency generation vibrational spectroscopy(SFG-VS)and atomic force microscope(AFM)to elucidate the fundamental role of solid-liquid interfaces in lubrication.Combined contributions of water structures and hydration effects were revealed,where water structures played the dominant role in lubrication for TiO2 surfaces of varying hydrophilicity,while hydration effects dominated with the increasing of ion concentrations.Superior lubrication is observed on the initial TiO2 surfaces with strongly H-bonded water molecules compared to the hydrophilic TiO2 surfaces with more disordered water.The stable ordered water arrangement with strong hydrogen bonds and the shear plane occurring between the ordered water layer and subsequent water layer may play a significant role in achieving lower friction.More adsorbed hydrated molecules with the increasing ionic concentration perturb ordered water but lead to the enhancement of hydration effects,which is the main reason for the improved lubrication for both TiO2.This work provides more insights into the detailed molecular-level understanding of the mechanism of hydration lubrication.
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    Adsorption limitation investigation on olefins for Cu-BTC

    Xiao YANGYunbo WANGWeihua CAORuizheng JIANG...
    606-617页
    查看更多>>摘要：To utilize Cu-benzene-1,3,5-tricarboxylate(Cu-BTC)adsorbed lubricant oils in the self-lubricating field,the adsorption properties of Cu-BTC on different 1-olefins must be clarified.In this work,1-hexene,1-octene,1-nonene,1-decene,1-undecene,and 1-dodecene were studied by the Monte Carlo method and experimentally.The adsorption limit of Cu-BTC for n-olefins was determined as 1-undecene by the adsorption isotherms.This suggested a limit for even straight-chain molecules to the adsorption of Cu-BTC.The maximum ratio of the olefin length of the largest pore diameter(L/D)of Cu-BTC was approximately 1.57.Furthermore,theoretical calculations(radial distribution function(RDF))and experiments(infrared(IR)spectra)confirmed the interaction of n-olefin adsorbates and the Cu-BTC framework occurred between the-CH= of olefins and the Cu and O atoms of the Cu-BTC framework.This work adds to the understanding and investigation of the adsorption of liquid lubricants using Cu-BTC as a metal-organic framework(MOF).
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    Origin and evolution of false brinelling and fretting corrosion under rolling conditions

    Xin JIALu HUANGMiao SUNWenbin LI...
    618-631页
    查看更多>>摘要：Rolling bearings working in oscillating applications often suffer from false brinelling and fretting corrosion that limit their service life.At present,the study of oscillation-induced failures is primarily dominated by a large number of sliding and bench tests.However,most of the previous work are not able to fully describe the two closely related but different failure mechanisms.In this study,the origin and evolution of the two failures are thoroughly investigated under strictly controlled oscillating rolling conditions.The results show that failure evolves from false brinelling to fretting corrosion under dry friction conditions regardless of the oscillation amplitude.This process is accompanied by a large area peeling and serious oxidation,and the oxygen content increases from 2.50 wt%to 21.22 wt%.Oxidation is a crucial factor in the evolution of false brinelling into fretting corrosion.However,the distribution of microwear and oxygen content depend on the oscillation amplitude.Under lubrication conditions,the friction coefficient(COF)is smaller in the initial stage and led to local slip or transient instability of rolling elements.Therefore,the size of the wear marks and COF increased and appeared to be larger than those under a dry friction condition.However,grease can separate the contact surfaces,only surface deformation owing to false brinelling and slight damage at the roughness level occurred.The evolution of false brinelling and fretting corrosion is also closely related to residual stress.False brinelling often occurrs with residual stress accomulation,meanwhile,the residual stress increases from 120 to 300 MPa.When peeling occurs,residual stress is released.The failure pattern transformed from false brinelling to fretting corrosion and is accompanied by oxidation.So far,none of investigation is able to show satisfactory evolution of oscillating-induced failures,this study may contribute to more scientific understanding of rolling bearings against long-run reciprocating oscillating wear.
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    Multiphysical contact of functionally graded magneto-electro-elastic material with imperfect bonding interface

    Yijin SUIHaibo ZHANGJieliang ZHAOWenzhong WANG...
    632-654页
    查看更多>>摘要：Three-dimensional(3D)frictional contact model of functionally graded magneto-electro-elastic(FGMEE)material with a conducting spherical punch under electromagnetic fields is presented.Two types of imperfect bonding interface of layers,dislocation-like interface and force-like interface,are considered.Frequency response functions(FRFs)for multilayered MEE material with imperfect interface subjected to unit mechanical,electric,and magnetic loads are derived.The FRFs are used with the semi-analytical method(SAM)to solve present multiphysical contact problem.The present model is verified by comparing with literatures and the finite element method(FEM)and used to study the contact problem of FGMEE film imperfectly bonded on homogenous MEE half-space under electromagnetic fields.Parametric studies are conducted to reveal the effects of imperfect interfaces and also film properties including gradient index and thickness.
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    Construction of ternary PEG200-based DESs lubrication systems via tailoring tribo-chemistry

    Yuting LISongyu LANYazhou LIUCheng CAO...
    655-669页
    查看更多>>摘要：Designing novel lubricants with easily customized structures,devisable compositions,and simple and economic synthesis over traditional lubricants is critical to fulfilling complex applications,prolonging machine lifetime,and saving energy.Deep eutectic solvents(DESs),which show tunable composition,adjustable structure,easy fabrication,and environmental friendliness,are promising candidates for variable and complicated lubricants applications.To promote the use of DESs as lubricants,a series of PEG200-based DESs with active heteroatoms were fabricated to tailor the tribological performance via tribo-chemistry.Thereinto,PEG200/boric acid(BA)DES shows optimal lubrication performance by forming tribo-chemical reaction film composited of B2O3,iron oxides,and FeOOH,and PEG200/thiourea(TU)DES displays abrasive wear-reducing property by producing FeS tribo-chemical film.Given the excellent abrasive wear-resistance of PEG200/TU DES and friction reduction of PEG200/BA DES,ternary PEG200/BA/TU DESs,composited of PEG200/TU DES and PEG200/BA DES,are first exploited.The ternary DESs possess superior wettability and thermal stability,which render them potential lubricants.Tribological tests of the ternary DESs demonstrate that synergistic lubrication is achieved by forming a transfer film consisting of FexBy,BN,B2O3,and FeS.Wherein FexBy,BN,and B2O3 increase load bearing of the film,and FeS mitigates severe abrasive wear.The proposed design philosophy of novel DESs as lubricants opens up a unique realm that is unattainable by traditional DESs lubrication mechanisms and provides a platform to design next-generation DESs lubrication systems.
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    Friction and wear performance of polyether ether ketone(PEEK)polymers in three lubrication regimes

    Davide MASSOCCHINora LECISMarco LATTUADADavide SCAGLIA...
    670-682页
    查看更多>>摘要：This experimental study investigates the friction and wear of three coatings commonly used in industrial applications,particularly in hydrodynamic bearings.The three materials under investigation were Babbitt,polyether ether ketone(PEEK)reinforced with 15%carbon fibers,and PEEK reinforced with 20%carbon fibers.The first polymer material was extruded,while the other was produced by fused deposition modelling(FDM).The materials were subjected to sliding tests in a pin-on-disc configuration,with a steel ball serving as the counter surface.The tests were conducted at room temperature,with a load of 10 N and under three different lubrication conditions:dry,grease,and oil.The linear speed was set at 0.3 m/s for the dry and semi-solid lubrication tests,while for the oil tests,the speed was set at 0.25 m/s.The greases used had consistency grades of NGLI 000 and NGLI 2.An ISO VG 68 circulation oil was used for the oil lubrication tests.Additionally,thermodynamic analyses were performed under the most severe conditions(i.e.,dry)to investigate the steel-Babbitt and steel-PEEK contact.
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    On the electric behaviour of conductive grease inside the contact zone

    Yuxin ZHOUJinjie LIUXinming LIHe CHONG...
    683-697页
    查看更多>>摘要：Conductive grease has been considered as a potential solution in addressing electric erosion issue inside motor bearings.Understanding the conductive grease performance,especially the electric and tribological behaviour is crucial for its application.This paper combines bulk grease characterization and contact film study considering both electrical and tribological loading conditions.The results show that the electric performance for the selected conductive grease sample is electric field dependent,including both frequency and voltage amplitude.Its film impedance inside the contact area is closely related to the external electric field,running condition,and lubrication regime.The following film impedance calculation tells that not only bulk grease electric parameters,but the contact parameter,lubricant film contour and lubrication condition should be considered when performing the overall bearing electrical modelling.
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    A novel polyionic liquid with lubricity and viscosity-increasing dual functionalities as the additive in aqueous lubrication system

    Bo YUKun ZOURui WANGQiang CHEN...
    698-710页
    查看更多>>摘要：The polyionic liquid poly-PEGMA-r-METAC(PPM)with quaternary ammonium has been synthesized and evaluated as additive in aqueous lubricating fluids.The rheological behavior of aqueous lubricating fluids with PPM has been characterized to confirm PPM's function as a viscosity modifier.The tribological behavior of aqueous lubricating fluids with PPM has been investigated on SRV-V and MTM testing machines.It was found that PPM has excellent viscosity-increasing,lubricating,and anti-wear properties as an additive for aqueous,which can be attributed to the ability of PPM to form the protective film and boundary tribofilm generated from complex tribochemical reaction on rubbing surface.The obtained PPM with dual functions of anti-corrosion additives and viscosity index improver can play an important role in diverse lubrication regimes.
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    Tribological behavior of lubricant-impregnated porous polyimide

    Jinbang LINingning ZHOUJanet S.S.WONG
    711-725页
    查看更多>>摘要：Porous materials impregnated with lubricants can be used in conditions where limited lubricant is desirable.In this work,three porous polyimides(PPI)with different densities were prepared.Polyalphaolefin(PAO)impregnated PPI(iPPI)discs were rubbed against steel and sapphire balls.In operando observations of the iPPI-sapphire contacts show that oil is released under an applied load,forming a meniscus around contacts.Cavitation at the outlet is created at high sliding speeds.The amount of released oil increases with increasing PPI porosity.Contact moduli,E*,estimated based on the actual contact size show that trapped oil in iPPIs contributes to load support.At higher speeds,tribological rehydration of the contact occurs in low density iPPI,with that E* rises with speed.For high density PPIs,high speeds give a constantly high E* which is limited by the viscoelastic properties of the PPI network and possibly the rate of oil exudation.Friction of iPPI-steel contacts is governed by the mechanical properties of the PPI,the flow of the lubricant,and the roughness of the PPI surfaces.For low-and medium-density(highly porous,high roughness)PPIs,large amount of oil is released,and lubrication is mainly via lubricant restricted in the contact in the pores and possibly tribological rehydration.For high density(low porosity)PPI,with lower roughness,hydrodynamic lubrication is achieved which gives the lowest friction.Our results show that polymeric porous materials for effective lubrication require the optimization of its surface roughness,stiffness,oil flow,and oil retentions.
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