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

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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Tribological behaviour of fused deposition modelling printed short carbon fibre reinforced nylon composites with surface textures under dry and water lubricated conditions

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friction 2022年第12期10卷 2045-2058页

作者： Ming LUO Siyu HUANG Ziyan MAN Julie M.CAIRNEY Li CHANG School of Aerospace Mechanical and Mechatronic EngineeringThe University of SydneySydney NSW 2006Australia Australian Centre for Microscopy and Microanalysis The University of SydneySydney NSW 2006Australia

Fused deposition modelling(FDM)printed short carbon fibre reinforced nylon(SCFRN)composites were *** friction and wear behaviour of printed materials were systematically investigated under both dry sliding and water lubricated *** results showed that with short fibre enhancements,the printed SCFRN achieved a lower friction coefficient and higher wear resistance than nylon under all tested ***,under water lubricated conditions,the printed SCFRN exhibited a low,stable friction coefficient due to the cooling and lubricating effects of ***,the specific wear rate of the printed specimens could be higher than that obtained under dry sliding conditions,especially when the load was relatively *** square textured surface was designed and created in the printing process to improve materials’tribological *** was found that with the textured surface,the wear resistance of the printed SCFRN was improved under dry sliding conditions,which could be explained by the debris collection or cleaning effect of surface ***,such a cleaning effect was less noticeable under lubricated conditions,as the liquid could clean the surface *** the other hand,surface textures could increase the surface area exposed to water,causing surface softening due to the higher water absorption *** a result,the samples having surface textures showed higher wear rates under lubricated *** work has provided new insights into designing wear resistant polymer materials using three-dimensional(3D)printing technologies,subjected to different sliding conditions.

关键词： fused deposition modelling(FDM) short carbon fibre reinforced nylon(SCFRN)composites transfer film friction and wear

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Efficacy of hierarchical pore structure in enhancing the tribological and recyclable smart lubrication performance of porous polyimide

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friction 2023年第6期11卷 1014-1026页

作者： Hongwei RUAN Yaoming ZHANG Fuzhi SONG Qihua WANG Chao WANG Tingmei WANG Key Laboratory of Science and Technology on wear and Protection of Materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China

Herein,a porous oil-containing material with hierarchical pore structure was successfully prepared through microtexturing large pores on the surface of porous polyimide(PPI)with single-level small *** to the conventional oil-containing material,the hierarchically porous oil-containing material exhibited high oil-content,and retained excellent mechanical properties and high oil-retention because of the synergistic effects of large pores and small ***,the lubricant stored in the hierarchically porous polyimide could release to the interface under thermal-and-mechano-stimuli,and the released lubricant could be reabsorbed into the hierarchically porous polyimide via the capillary-force offered by the porous *** on the high oil-content and recyclable oil release/reabsorption,the hierarchically porous oil-containing polyimide exhibited excellent lubrication performance(coefficient of friction was 0.057).Furthermore,the composite could perform 1,069 cycles of smart lubrication(1 h per cycle),which significantly extended the service life of the hierarchically porous oil-containing smart lubrication material.

关键词： recyclable smart lubrication hierarchical pore structure oil-content and oil-retention friction and wear

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Bioinspired PcBN/hBN fibrous monolithic ceramic:High-temperature crack resistance responses and self-lubricating performances

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Journal of Advanced Ceramics 2022年第9期11卷 1391-1403页

作者： Shu-na CHEN Hengzhong FAN Yunfeng SU Jicheng LI Junjie SONG Litian HU Yongsheng ZHANG 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 100049China

The high strength and toughness of natural materials are mainly determined by a combination of mechanisms operating at different length scales,which can be used as a strategy to reduce the intrinsic brittleness of *** by the architectures of bamboo,the polycrystalline cubic boron nitride/hexagonal boron nitride(PcBN/hBN)fibrous monolithic ceramics with a long fiber arrangement structure was constructed with PcBN fiber cells and hBN cell boundaries,and its crack resistance responses and tribological performances were *** composite ceramic failed in a non-brittle manner with the rising resistance curve(R-curve)behavior,which was attributed to multiscale crack effects in the hierarchical *** maximum crack growth toughness was extremely high(approximately 21 MPa×m^(1/2)),corresponding to a 270%increase over the crack initiation *** fracture resistance could be retained even above 1000℃.Moreover,the composite ceramic exhibited low and stable friction coefficients(approximately 0.33)when paired with a Si_(3)N_(4)pin at high temperature(1000℃),owing to the lubrication function of hBN cell boundaries with weak van der Waals forces and a small amount of liquid B_(2)O_(3)*** a result,a synergistic improvement of mechanical and tribological properties at high temperature(1000℃)was realized by combining bionic structure and tribological *** provides important theoretical and technical support for expanding the application of self-lubricating composite ceramics in harsh environments.

关键词： self-lubricating composite ceramic bioinspired structure resistance curve(R-curve) high-temperature property friction and wear

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Superior Slurry Erosion Behavior of a Casting NiCoCrFeNb0.45 Eutectic High Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2020年第8期33卷 1111-1116页

作者： Jinling Lu Zhenjiang Wang Wei Wang Kexuan Zhou Feng He Zhijun Wang Faculty of Water Resources and Hydroelectric Engineering Xi’an University of TechnologyXi'an 710048China State Key Laboratory of Solidifi cation Processing Northwestern Polytechnical UniversityXi'an 710072China

The flow passage components in hydraulic machinery will be eroded rapidly when running in sand *** wear resistance of materials commonly used in hydraulic machinery needs to be improved to prevent the failure of hydraulic *** wear-resistant materials are urgently needed to improve the service life of hydraulic *** high entropy alloy(EHEA)is a new kind of alloys with in situ lamellar ***0.45 EHEA has combined excellent strength and *** this study,slurry erosion tests of NiCoCrFeNb0.45 EHEA were carried out with different impact angles and impact velocities using a rotary jet erosion test *** NiCoCrFeNb0.45EHEA exhibited significant slurry erosion resistance compared with medium carbon steel 1045 and stainless steel 04 Cr13 Ni5 *** erosion rate of EHEA is much *** with medium carbon steel and stainless steel,the erosion of EHEA is completed via the accumulation and removal of platelets after plowing and work hardening,accompanied by partial micro-cutting.

关键词： Eutectic high entropy alloy friction and wear Slurry erosion

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Sliding wear of the Hybrid Kevlar/PTFE Fabric Reinforced Phenolic Composite Filled with Nano-titania

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Chinese Journal of Mechanical Engineering 2011年第1期24卷 154-159页

作者： YANG Yulin HUANG Shijun ZU Dalei ZHANG Ruijun QI Xiaowen Key Laboratory of Fundamental Science of Mechanical Structure and Material Science under Extreme Condition for National Defence Yanshan University Qinhuangdao 066004 China State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China

The Kevlar/polytetrafluroethylene（Kevlar/PTFE） fabric composite can be used as a self-lubricating liner of the self-lubricating *** types of nano-particles can improve the tribological performance of the polymer-based ***,up to now,published work on the effect of nano-particles on the tribological performance of the fabric composite which can be used as a self-lubricating liner is quite ***,for the purpose of exploring a way to significantly improve the tribological performance of the fabric composite,the tribological performance of the Kevlar/PTFE fabric composite filled with nano-titania is evaluated by using the block-on-ring wear *** scanning electron microscopy is utilized to observe the morphologies of worn surfaces of the fabric composites and the *** tensile properties of the composites are evaluated on the universal material testing *** test results show that the addition of nano-titania at a proper mass fraction of the matrix resin improves the wear resistance and the tensile strength,decreases the friction coefficient,and makes the wear volume of the composite reach a relative steady state more quickly;plastic deformation and microcutting are important for the wear of the fabric composite;a lubricating layer is formed on the worn surface of the composite during sliding,and the lubricating layer is critical for the tribological performance of the composite;the formation and properties of the lubricating layer are influenced by the nano-titania *** proposed study on the effect of nano-titania on the tribological performance of the Kevlar/PTFE fabric composite,especially on the evolution of the worn surface of the composite,provides the basis for further understanding of the influence mechanism of the nano-particles on the tribological performance of the composite and explores a method of improving the tribological performance of the composite.

关键词： hybrid Kevlar/PTFE fabric composite self-lubricating liner nano-titania friction and wear lubricating layer

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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

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Effect of Electrical Current on the Tribological Behavior of the Cu-WS_2-G Composites in Air and Vacuum

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Chinese Journal of Mechanical Engineering 2013年第2期26卷 384-392页

作者： QIAN Gang FENG Yi LI Bin HUANG Shiyin LIU Hongjuan DING Kewang School of Materials Science and Engineering Hefei University of Technology

As the traditional graphite-based composites cannot meet the requirement of rapid developing modern industry, novel sliding electrical contact materials with high self-lubricating performance in multiple environments are eagerly required. Herein a copper-based composite with WS2 and graphite as solid lubricant are fabricated by powder metallurgy hot-pressed method. The friction and wear behaviors of the composites with and without current are investigated under the condition with sliding velocity of 10 m/s and normal load of 2.5N/cm 2 in both air and vacuum. Morphologies of the worn surfaces are observed by optical microscope and compositions of the lubricating films are analyzed by XPS. Surface profile curves and roughness of the worn surfaces are obtained by 2205 surface profiler. The results of wear tests show that the friction coefficient and wear volume loss of the composites with current are greater than that without current in both air and vacuum due to the adverse effects of electrical current which damaged the lubricating film partially and roughed the worn surfaces. XPS results demonstrate that the lubricating film formed in air is composed of oxides of Cu, WS2 , elemental S and graphite, while the lubricating film formed in vacuum is composed of Cu, WS2 and graphite. Because of the synergetic lubricating action of oxides of Cu, WS2 and graphite, the composites show low friction coefficient and wear volume loss in air condition. Owing to the fact that graphite loses its lubricity which makes WS2 become the only lubricant, severe adhesive and abrasive wear occur and result in a high value of wear rate in vacuum condition. The formation of the lubricating film on the contact interface between the brush and ring is one of the factors which can greatly affect the wear performance of the brushes. The low contact voltage drop of the composites in vacuum condition is attributed to the high content of Cu in the surface film. This study fabricated a kind of new sli

关键词： Cu-WS2-G composites electrical current air and vacuum environments friction and wear contact voltage drop

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Performances and failure mechanism of semi-metallic friction materials doping rare earths

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Journal of Rare Earths 2010年第S1期28卷 464-468页

作者：许越王晓静白婧卢立国 School of Chemistry and Environment Beijing University of Aeronautics and Astronautics

In order to improve performance of semi-metallic friction material,the specimens doped with rare earth(cerous nitrate) were *** effects of rare earth(cerous nitrate) and post heat treatment on properties of friction materials were discussed,and failure mechanism of friction materials was also *** result showed that the existing of cerous nitrate could stabilize friction coefficient,lower wear rate and increase impact strength,and when the content of the cerous nitrate was 3.0 wt.%,the semi-metallic friction material possessed optimal *** different post heat treatments had an influence on the friction coefficient,wear rate and linear thermal expansion coefficient of semi-metallic friction *** worn surface and fractured surface were observed and analyzed by scanning electronic microscopy(SEM).It was identified that the semi-metallic friction materials doped with cerous nitrate acted abrasive wear and adhesive wear at the low temperature,and abrasive wear,adhesive wear and fatigue wear of materials appeared at the high *** fracture of materials might be the result of matrix cracking interacting with interface separation.

关键词： rare earths post heat treatment friction and wear failure mechanism

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wear and transfer characteristics of carbon fiber reinforced polymer composites under water lubrication

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中国有色金属学会会刊:英文版 2004年第Z1期14卷 332-340页

作者： JIA Jun-hong CHEN Jian-min ZHOU Hui-di CHEN Lei State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China

The tribological characteristics of carbon fiber reinforced polymer composites under distilled-water-lubricated-sliding and dry-sliding against stainless steel were comparatively investigated. Scanning electron microscopy (SEM) was utilized to examine composite microstructures and modes of failure. The typical chemical states of elements of the transfer film on the stainless steel were examined with X-ray photoelectron spectroscopy (XPS). wear testing and SEM analysis show that all the composites hold the lowered friction coefficient and show much better wear resistance under water lubricated sliding against stainless steel than those under dry sliding. The wear of composites is characterized by plastic deformation, scuffing, micro cracking, and spalling under both dry-sliding and water lubricated conditions. Plastic deformation, scuffing, micro cracking, and spalling, however, are significantly abated under water-lubricated condition. XPS analysis conforms that none of the materials produces transfer films on the stainless steel counterface with the type familiar from dry sliding, and the transfer of composites onto the counterpart ring surface is significantly hindered while the oxidation of the stainless steel is speeded under water lubrication. The composites hinder transfer onto the steel surface and the boundary lubricating action of water accounts for the much smaller wear rate under water lubrication compared with that under dry sliding. The easier transfer of the composite onto the counterpart steel surface accounts for the larger wear rate of the polymer composite under dry sliding.

关键词： friction and wear transfer film water lubrication carbon fiber polymer composite

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