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Bio-Design and Manufacturing 2024年第1期7卷 43-56页

作者： Yang Li Jibao Zheng Changning Sun Dichen Li State Key Laboratory for Manufacturing System Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710054China National Medical Products Administration(NMPA)Key Laboratory for Research and Evaluation of Additive Manufacturing Medical Devices Xi’an Jiaotong UniversityXi’an 710054China

Based on the building principle of additive manufacturing,printing orientation mainly determines the tribological properties of joint *** this study,we created a polyether-ether-ketone(PEEK)joint prosthesis using fused filament fabrication and investigated the effects of printing orientation on its tribological properties using a pin-on-plate tribometer in 25% newborn calf *** ultrahigh molecular weight polyethylene transfer film is formed on the surface of PEEK due to the mechanical capture of wear debris by the 3D-printed groove morphology,which is significantly impacted by the printing orientation of *** the printing orientation was parallel to the sliding direction of friction,the number and size of the transfer film increased due to higher steady *** transfer film protected the matrix and reduced the friction coefficient and wear rate of friction pairs by 39.13%and 74.33%,***,our findings provide a novel perspective regarding the role of printing orientation in designing knee prostheses,facilitating its practical applications.

关键词： 3D printing orientation transfer film Tribological properties Polyether-ether-ketone Knee prosthesis

Tribological properties of PTFE-based fabric composites at cryogenic temperature

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Friction 2024年第2期12卷 245-257页

作者： Mingkun XU Zidan WANG Lihe GUO Liming TAO Tianbao MA Tingmei WANG Qihua WANG Key Laboratory of Science and Technology on Wear and Protection of Materials Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Fabric composites are widely employed in self-lubricating bearing liners as solid lubrication *** the tribological behaviors of fabric composites have been extensively studied,the cryogenic tribological properties and mechanisms have been scarcely reported and are largely unclear to instruct material design for aerospace and other high-tech ***,the tribological properties of polytetrafluoroethylene(PTFE)-based hybrid-fabric composites were investigated at cryogenic and ambient temperatures in the form of pin-on-disk friction under heavy *** results suggest that the friction coefficients of the hybrid-fabric composites obviously increase with a decrease in wear when the temperature drops from 25 to−150°***,thermoplastic polyetherimide(PEI),as an adhesive for fabric composites,has better cryogenic lubrication performance than thermosetting phenol formaldehyde(PF)resin,which can be attributed to the flexible chemical structure of *** excellent lubrication performance of hybrid-fabric composites is attributed to the transfer film formed by PTFE fibers on the surface of fabrics.

关键词： cryogenic temperatures fabric composites friction and wear transfer film

Investigation on forward and backward transfer process during carbon fiber/epoxy composites dry-sliding against iron alloy

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Science China(Technological Sciences) 2022年第11期65卷 2564-2572页

作者： LU LongSheng LI ZeHong FANG HeZhengZi XIE YingXi WANG WenTao School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou 510641China

Carbon fiber reinforced polymer(CFRP)composites with high load-bearing capacity are currently ideal materials in tribological load *** of the unique features during the friction process of CFRP/metal is the in-situ formation of an ultrathin and uniform transfer film on the metal surface,and the related initial/transfer mechanism is very important but still *** studies mainly focus on the one-way transfer process of CFRP to the metal surface,that is,forward transfer;whereas another easily overlooked issue is that the metal material also transfers backward to the CFRP ***,we firstly prepared carbon fiber/epoxy resin composites(CF/EP)by the hot-pressing method and then carried out friction tests with iron alloy as the control *** underlying mechanism of the forward/backward transfer process is revealed by controlling the morphological evolution and iron content of the transfer film on worn CF/*** to the variation law of friction coefficient with time,the interfacial friction is divided into three different stages,among which the behaviours of“micro-convex contact”and“epoxy exfoliation”occur throughout the whole *** believe this work could provide a meaningful reference for studying the friction behaviour and mechanism,especially the forward and backward transfer between composites/metals,and further broaden its emerging applications in future energy,aerospace and rail transportation.

关键词： carbon fiber epoxy composite transfer film friction mechanism

Simultaneously enhanced heat dissipation and tribological properties of polyphenylene sulfide-based composites via constructing segregated network structure

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Journal of Materials Science & Technology 2022年第4期99卷 239-250页

作者： You Shi Yang Bai Yanzhou Lei Haoruo Zhang Shengtai Zhou Huawei Zou Mei Liang Yang Chen The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityChengdu 610065China

Self-lubricating polyphenylene sulfide(PPS)composites were fabricated by constructing a segregated network structure using the co-deposition *** carboxyl-functionalized multi-walled carbon nanotubes(CNTs)and silicon carbide(SiC)were successfully coated on the surface of PPS powders with the aid of self-polymerization of dopamine(PDA)and co-polymerization between PDA and polyethyleneimine(PEI),thereby forming PPS@PDA-CNTs-SiC hierarchical reinforcing *** showed that the thermal conductivity of PPS@PDA-CNTs-SiC(0.97 W/(m K))is about 120%higher than that of PPS/CNTs/*** friction coefficient(0.193)and specific wear rate(2.50×10^(-5)mm^(3)/(N m))of PPS@PDA-CNTs-SiC are 18.9%and 50%lower than those of PPS/CNTs/SiC,*** enhanced thermal conductivity of PPS@PDA-CNTs-SiC contributes to rapid dissipation of frictional heat at the sliding interface which protects the polymer substrate from being destroyed or peeled,thereby improving the tribological *** work provides new insights into expanding the application of self-lubricating polymer composites in the fields where efficient heat dissipation is also a primary concern.

关键词： Polyphenylene sulfide Segregated network Thermal conductivity Self-lubricating polymer composites transfer film

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

Tribology of self-lubricating high performance ATSP,PI,and PEEK-based polymer composites up to 300℃

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Friction 2023年第1期11卷 141-153页

作者： Kian BASHANDEH Pixiang LAN Andreas A.POLYCARPOU Department of Mechanical Engineering Texas A&M UniversityCollege StationTexas 77843USA ATSP Innovations Inc.Texas 77055USA

High-performance polymers(HPPs)are increasingly used in different industrial machinery components,particularly for rubbing parts that demand reliable and durable operation at extreme sliding conditions such as elevated temperature environments,where the use of conventional lubricants is not *** current study investigates the role of environmental temperature on the tribological properties of three advanced HPPs,namely aromatic thermosetting copolyester(ATSP),polyimide(PI),and polyether ether ketone(PEEK)based polymer *** experiments were carried out at different environmental temperatures from room temperature up to 300℃,and under dry sliding *** attention was given to the role of temperature on the development of transfer films and its subsequent effect on the tribological *** ATSP composite was recommended as the best performing material,based on the overall tribological performance at all examined operating temperatures.

关键词： aromatic thermosetting copolyester(ATSP) polyimide(PI) polyether ether ketone(PEEK) high temperature tribology transfer film

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

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

Effects of Friction Heat on the Tribological Properties of the Woven Self-lubricating Liner

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Chinese Journal of Mechanical Engineering 2009年第6期22卷 918-924页

作者： YANG Yulin 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. Yanskan Universiry Qinhuangdao 066004 China

In the dry-sliding process of the woven self-lubricating liner which is used in the self-lubricating spherical plain bearing, the friction heat plays an important role in the tribological performances of the liner. It has important value to study on the relationship between tribological performances of the liner and the friction heat. Unforttmately, up to now, published work on this relationship is quite scarce. Therefore, the effect of friction heat on the tribological performances of the liner was investigated in the present work. The tribological behaviors of the liner were evaluated by using the high temperature end surface wear tester. Scanning electron microscopy （SEM） was utilized to examine the morphologies of worn surfaces of the liner and study the failure modes. Differential scanning calorimetry （DSC） measurement and X-ray diffraction （XRD） analysis were performed to study the behaviors of the wear debris. The temperature rise on the worn surface was calculated according to classical models. SEM observation shows that the dominating wear mechanism for the liner is mainly affected by friction shear force, contact pressure and friction heat. Higher fusion heat for the wear debris than that for the pure polytetrafluroethylene （PTFE） indicates that the PTFE is the main portion of the wear debris, and, the PTFE in the wear debris shows a higher crystallisation degree owing to the effects of friction shear force and the friction heat. Combining the calculated temperature rise results with the wear rate of the liner, it can be concluded that the effects of temperature rise o n the tribological performances of the liner become more obvious when the temperature rise exceeds the glass transition temperature （Tg） of the PTFE. The wear resistance of the liner deteriorates dramatically when the temperature rise approaches to the melting point （Ton） of the PTFE. The tribological performances of the liner can be improved when the temperature rise exceeds Tg but is far l

关键词： woven fabric self-lubricating liner friction and wear friction heat differential scanning calorimetry thermal analysis transfer film

An investigation on the tribological behaviors of steel/copper and steel/steel friction pairs via lubrication with a graphene additive

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Friction 2021年第2期9卷 228-238页

作者： Junyuan MAO Guangyan CHEN Jun ZHAO Yongyong HE Jianbin LUO State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China College of Mechanical and Electrical Engineering Beijing University of Chemical TechnologyBeijing 100029China

In this study,the tribological behaviors of graphene as a lubricant additive for steel/copper and steel/steel friction pairs were *** the steel/copper friction pair,the graphene sheets remarkably decreased the coefficient of friction and wear scar depth under low loads,but these slightly increased under high *** steel/steel friction pair showed excellent tribological properties even under high *** plastic deformation on the copper surface reduced the stability of the graphene tribofilm because of a rough copper transfer film on the steel during the running-in *** results provide a better understanding of the mechanism of graphene as a lubricant additive.

关键词： steel/copper and steel/steel friction pairs tribological behaviors graphene additives transfer film