Running-In Behavior Of A H-Dlc/Al,
2021
Tribology Research Institute, State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China
Running-In Behavior Of A H-Dlc/Al, Pengfei Shi, Junhui Sun, Yunhai Liu, Bin Zhang, Junyan Zhang, Lei Chen, Linmao Qian
Friction
Diamond-like carbon (DLC) film has been developed as an extremely effective lubricant to reduce energy dissipation; however, most films should undergo running-in to achieve a super-low friction state. In this study, the running-in behaviors of an H-DLC/Al2O3 pair were investigated through a controllable single-asperity contact study using an atomic force microscope. This study presents direct evidence that illustrates the role of transfer layer formation and oxide layer removal in the friction reduction during running-in. After 200 sliding cycles, a thin transfer layer was formed on the Al2O3 tip. Compared with a clean tip, this …
Nanofriction Characteristics Of H-Bn With Electric Field Induced Electrostatic Interaction,
2021
Shanghai Collaborative Innovation Center for High Performance Fiber Composites, Donghua University, Shanghai 201620, China;College of Mechanical Engineering, Donghua University, Shanghai 201620, China
Nanofriction Characteristics Of H-Bn With Electric Field Induced Electrostatic Interaction, Kemeng Yu, Kun Zou, Haojie Lang, Yitian Peng
Friction
The nanofriction properties of hexagonal boron nitride (h-BN) are vital for its application as a substrate for graphene devices and solid lubricants in micro- and nano-electromechanical devices. In this work, the nanofriction characteristics of h-BN on Si/SiO2 substrates with a bias voltage are explored using a conductive atomic force microscopy (AFM) tip sliding on the h-BN surface under different substrate bias voltages. The results show that the nanofriction on h-BN increases with an increase in the applied bias difference (Vt-s) between the conductive tip and the substrate. The nanofriction under negative Vt-s is larger than that …
Transient Tribo-Dynamic Analysis Of Crosshead Slipper In Low-Speed Marine Diesel Engines During Engine Startup,
2021
State Key Laboratory of Mechanical System and Vibration, Shanghai Jiaotong University, Shanghai 200240, China;School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China
Transient Tribo-Dynamic Analysis Of Crosshead Slipper In Low-Speed Marine Diesel Engines During Engine Startup, Rui Li, Xianghui Meng, Jingjin Dong, Wenda Li
Friction
A crosshead slipper-guide system, which bears a significant thrust force, is an essential friction pair in low-speed marine diesel engines. Owing to the low moving speed of the crosshead slipper during engine startup, it is difficult to form good hydrodynamic lubrication between the crosshead slipper and guide. Therefore, a detailed analysis of the crosshead slipper during engine startup is needed. In this study, a new transient tribo-dynamic model for a crosshead slipper during the engine startup process is presented. The model consists of a mixed lubrication model of the crosshead slipper-guide and dynamic models of the piston assembly, crosshead assembly, …
Synergistic Modification Of The Tribological Properties Of Polytetrafluoroethylene With Polyimide And Boron Nitride,
2021
College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Synergistic Modification Of The Tribological Properties Of Polytetrafluoroethylene With Polyimide And Boron Nitride, Chaojie Xie, Kejian Wang
Friction
Polytetrafluoroethylene (PTFE) blended with polyimide (PI) and filled with boron nitride (BN) is prepared through cold pressing and sintering for composites with remarkable wear resistance and reduced coefficient of friction (COF). The characterizations show that BN and PI at different levels, improve the hardness, dynamic thermo-mechanical modulus, thermal conductivity, and tribological properties of PTFE. PI boosts the dispersion and bonding of BN in PTFE. In dry sliding friction of a block-on-ring tribometer, the wear rate and COF of 10:10:80 BN/PI/PTFE reduce to almost 1/300 and 80% of those of pure PTFE, respectively, as the wear mechanism transition from being adhesive …
Role Of Titanium Carbide And Alumina On The Friction Increment For Cu-Based Metallic Brake Pads Under Different Initial Braking Speeds,
2021
Laboratory of Special Ceramics and Powder Metallurgy, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Role Of Titanium Carbide And Alumina On The Friction Increment For Cu-Based Metallic Brake Pads Under Different Initial Braking Speeds, Tao Peng, Qingzhi Yan, Xiaolu Zhang, Yan Zhuang
Friction
To understand the effect of abrasives on increasing friction in Cu-based metallic pads under different braking speeds, pad materials with two typical abrasives, titanium carbide (TiC) and alumina (Al2O3), were produced and tested using a scale dynamometer under various initial braking speeds (IBS). The results showed that at IBS lower than 250 km/h, both TiC and Al2O3 particles acted as hard points and exhibited similar friction-increasing behavior, where the increase in friction was not only enhanced as IBS increased, but also enhanced by increasing the volume fraction of the abrasives. However, at higher …
Synergistic Lubricating Effect Of Graphene/Ionic Liquid Composite Material Used As An Additive,
2021
School of Mechanical and Transportation Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China
Synergistic Lubricating Effect Of Graphene/Ionic Liquid Composite Material Used As An Additive, Lincong Liu, Ming Zhou, Youtang Mo, Pengpeng Bai, Qilin Wei, Long Jin, Shengli You, Mingyue Wang, Liangchuan Li, Xin Chen, Xiao Li, Yu Tian
Friction
We prepared a graphene/ionic liquid (G/IL) composite material by the hybridization of G and an IL for use as a lubricating oil additive. The friction coefficient and wear volume of a base oil containing 0.04 wt% of the G/IL composite was reduced by 45% and 90%, respectively. Furthermore, the base oil containing the G/IL composite exhibited better lubricating properties than the base oil containing G, IL, or a mixture of IL and G at the same mass fraction. A synergistic lubrication mechanism was also revealed. The G/IL composite was adsorbed and deposited on the wear surface, forming a more ordered …
Structure And Tribocorrosion Behavior Of Crmosicnnanocomposite Coating With Low C Content In Artificial Seawater,
2021
National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Structure And Tribocorrosion Behavior Of Crmosicnnanocomposite Coating With Low C Content In Artificial Seawater, Yongqiang Fu, Fei Zhou, Maoda Zhang, Qianzhi Wang, Zhifeng Zhou
Friction
CrMoSiCN nanocomposite coatings with a low C content were prepared on Ti-6Al-4V using an unbalanced magnetron sputtering system, and their corresponding microstructures, mechanical properties, and tribocorrosion performance were evaluated in detail. The results revealed that the CrMoSiCN coating had a compact nanocomposite microstructure consisting of CrN and Mo2N nanocrystallites, (Cr, Mo)N solid solution, and Si-C-N amorphous phases. Moreover, the coating exhibited superior mechanical properties with a hardness of 28.6 GPa and an elastic modulus of 273 GPa, owing to the solid solution strengthening effect. The tribocorrosion test results showed that the dominant failure of the Ti-6Al-4V alloy was …
Cavitation Erosion Resistance Of 316l Stainless Steel Fabricated Using Selective Laser Melting,
2021
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China
Cavitation Erosion Resistance Of 316l Stainless Steel Fabricated Using Selective Laser Melting, Hongqin Ding, Qing Tang, Yi Zhu, Chao Zhang, Huayong Yang
Friction
Cavitation erosion degrades the performance and reliability of hydraulic machinery. Selective laser melting (SLM) is a type of metal additive manufacturing technology that can fabricate metal parts directly and provide lightweight design in various industrial applications. However, the cavitation erosion behaviors of SLM-fabricated parts have rarely been studied. In this study, SLM 316L stainless steel samples were fabricated via SLM technology considering the scanning strategy, scanning speed, laser power, and build orientation. The effect of the process parameters on the cavitation erosion resistance of the SLM-fabricated 316L stainless steel samples was illustrated using an ultrasonic vibratory cavitation system. The mass …
Simulation Of The Fatigue-Wear Coupling Mechanism Of An Aviation Gear,
2021
State Key Laboratory of Mechancial Transmissions, Chongqing University, Chongqing 400044, China
Simulation Of The Fatigue-Wear Coupling Mechanism Of An Aviation Gear, Boyu Zhang, Huaiju Liu, Caichao Zhu, Yibo Ge
Friction
The contact fatigue of aviation gears has become more prominent with greater demands for heavy-duty and high-power density gears. Meanwhile, the coexistence of tooth contact fatigue damage and tooth profile wear leads to a complicated competitive mechanism between surface-initiated failure and subsurface-initiated contact fatigue failures. To address this issue, a fatigue-wear coupling model of an aviation gear pair was developed based on the elastic-plastic finite element method. The tooth profile surface roughness was considered, and its evolution during repeated meshing was simulated using the Archard wear formula. The fatigue damage accumulation of material points on and underneath the contact surface …
High-Temperature Friction Behavior Of Amorphous Carbon Coating In Glass Molding Process,
2021
Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering, College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China
High-Temperature Friction Behavior Of Amorphous Carbon Coating In Glass Molding Process, Kangsen Li, Gang Xu, Xiaobin Wen, Jun Zhou, Feng Gong
Friction
In the glass molding process, the sticking reaction and fatigue wear between the glass and mold hinder the service life and functional application of the mold at the elevated temperature. To improve the chemical inertness and anti-friction properties of the mold, an amorphous carbon coating was synthesized on the tungsten carbide-cobalt (WC-8Co) substrate by magnetron sputtering. The friction behavior between the glass and carbon coating has a significant influence on the functional protection and service life of the mold. Therefore, the glass ring compression tests were conducted to measure the friction coefficient and friction force of the contact interface between …
Tribological Properties Of Multilayer Tetrahedral Amorphous Carbon Coatings Deposited By Filtered Cathodic Vacuum Arc Deposition,
2021
Department of Extreme Environmental Coatings, Surface Technology Division, Korea Institute of Materials Science , Gyeongnam-do 51508, Republic of Korea
Tribological Properties Of Multilayer Tetrahedral Amorphous Carbon Coatings Deposited By Filtered Cathodic Vacuum Arc Deposition, Young-Jun Jang, Jae-Il Kim, Wooyoung Lee, Jongkuk Kim
Friction
Tetrahedral amorphous carbon (ta-C) has emerged as an excellent coating material for improving the reliability of application components under high normal loads. Herein, we present the results of our investigations regarding the mechanical and tribological properties of a 2-μm-thick multilayer ta-C coating on high-speed steel substrates. Multilayers composed of alternating soft and hard layers are fabricated using filtered a cathodic vacuum arc with alternating substrate bias voltages (0 and 100 V or 0 and 150 V). The thickness ratio is discovered to be 1:3 for the sp2-rich and sp3-rich layers. The results show that the hardness …
Improvements In Tribological And Anticorrosion Performance Of Porous Ti-6al-4v Via Peo Coating,
2021
Materials Engineering, E.I.I., Universidad de Valladolid, Valladolid 47011, Spain;BioecoUVA Research Institute, Universidad de Valladolid, Valladolid 47011, Spain
Improvements In Tribological And Anticorrosion Performance Of Porous Ti-6al-4v Via Peo Coating, C. Garcia-Cabezón, M.L. Rodríguez-Méndez, V. Amigó Borrás, R. Bayón, C. Salvo-Comino, C. Garcia-Hernandez, F. Martin-Pedrosa
Friction
Medical implants manufactured using biomaterial Ti-6Al-4V exhibit some disadvantages. Its higher elastic modulus than that of natural bone can cause stress shielding problems. This can be avoided using Ti-6Al-4V with pores in the implant structure. However, poor corrosion and tribocorrosion behaviors are yielded because of the large area exposed to the medium. To mitigate both issues, coating technologies can be applied. The plasma electrolytic oxidation (PEO) process is a cost-effective process that has been used successfully in nonporous Ti alloys. In this study, two PEO coatings with different amounts of Ca/P are used. However, reports regarding their application in porous …
Simultaneous Energy Harvesting And Tribological Property Improvement,
2021
Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China
Simultaneous Energy Harvesting And Tribological Property Improvement, Xiaofan Wang, Jiliang Mo, Huajiang Ouyang, Zaiyu Xiang, Wei Chen, Zhongrong Zhou
Friction
In this study, piezoelectric elements were added to a reciprocating friction test bench to harvest friction-induced vibration energy. Parameters such as vibration acceleration, noise, and voltage signals of the system were measured and analyzed. The results show that the piezoelectric elements can not only collect vibration energy but also suppress friction-induced vibration noise (FIVN). Additionally, the wear of the friction interface was examined via optical microscopy (OM), scanning electron microscopy (SEM), and white-light interferometry (WLI). The results show that the surface wear state improved because of the reduction of FIVN. In order to analyze the experimental results in detail and …
Pin-On-Disc Study Of Dry Sliding Behavior Of Co-Free Hvof-Coated Disc Tested Against Different Friction Materials,
2021
Department of Industrial Engineering, University of Trento, Trento 32122, Italy
Pin-On-Disc Study Of Dry Sliding Behavior Of Co-Free Hvof-Coated Disc Tested Against Different Friction Materials, Matteo Federici, Cinzia Menapace, Alessandro Mancini, Giovanni Straffelini, Stefano Gialanella
Friction
The dry sliding behavior of three commercial friction materials (codenamed FM1, FM2, and FM3) tested against a Co-free cermet coating produced by high-velocity oxy-fuel (HVOF) on gray cast-iron discs is investigated. FM1 is a conventional low-metallic friction material, FM2 is developed for using against HVOF-coated discs, and FM3 is a Cu-free friction material with a low content of abrasives and a relatively high concentration of steel fibers. For the tribological evaluation, they are tested on a pin-on-disc (PoD) test rig against Co-free HVOF-coated discs, with particular attention to the running-in stage, which is fundamental for the establishment of a friction …
Impact Of Chosen Force Fields And Applied Load On Thin Film Lubrication,
2021
School of Mechanical, Materials, Mechatronics, and Biomedical Engineering, University of Wollongong, NSW 2522, Australia
Impact Of Chosen Force Fields And Applied Load On Thin Film Lubrication, Thi D. Ta, Hien D. Ta, Kiet A. Tieu, Bach H. Tran
Friction
The rapid development of molecular dynamics (MD) simulations, as well as classical and reactive atomic potentials, has enabled tribologists to gain new insights into lubrication performance at the fundamental level. However, the impact of adopted potentials on the rheological properties and tribological performance of hydrocarbons has not been researched adequately. This extensive study analyzed the effects of surface structure, applied load, and force field (FF) on the thin film lubrication of hexadecane. The lubricant film became more solid-like as the applied load increased. In particular, with increasing applied load, there was an increase in the velocity slip, shear viscosity, and …
Functionalization Of Alumina Particles To Improve The Performance Of Eco-Friendly Brake-Pads,
2021
Centre for Automotive Research and Tribology , Indian Institute of Technology Delhi, Hauz-Khas, New Delhi-110016, India
Functionalization Of Alumina Particles To Improve The Performance Of Eco-Friendly Brake-Pads, Vanvirsinh Chauhan, Jayashree Bijwe, Ashish Darpe
Friction
Abrasives, such as oxides of alumina (Al), silica (Si), zirconia (Zr), chromium (Cr) etc., are added to raise the friction level and also to remove the glaze on the disc so that surface will be rejuvenated continuously during braking and will contribute to maintain the desired friction level. However, these inorganic particles have less adhesion with the resin/binder and hence are easily dug out during wearing process contributing to higher wear. If efforts are made to enhance the filler-matrix adhesion, not only the wear of friction material (FM) should reduce, the particles may stay for a longer time on the …
Fast Laser Surface Texturing Of Spherical Samples To Improve The Frictional Performance Of Elasto-Hydrodynamic Lubricated Contacts,
2021
Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;AC2T research GmbH, Wiener Neustadt 2700, Austria;Polytechnic School, University of São Paulo-USP, São Paulo 05508-030, Brazil
Fast Laser Surface Texturing Of Spherical Samples To Improve The Frictional Performance Of Elasto-Hydrodynamic Lubricated Contacts, G. Boidi, P.G. Grützmacher, A. Kadiric, F.J. Profito, I.F. Machado, C. Gachot, D. Dini
Friction
Textured surfaces offer the potential to promote friction and wear reduction by increasing the hydrodynamic pressure, fluid uptake, or acting as oil or debris reservoirs. However, texturing techniques often require additional manufacturing steps and costs, thus frequently being not economically feasible for real engineering applications. This experimental study aims at applying a fast laser texturing technique on curved surfaces for obtaining superior tribological performances. A femtosecond pulsed laser (Ti:Sapphire) and direct laser interference patterning (with a solid-state Nd:YAG laser) were used for manufacturing dimple and groove patterns on curved steel surfaces (ball samples). Tribological tests were carried out under elasto-hydrodynamic …
A Molecular Dynamics Study On The Tribological Behavior Of Molybdenum Disulfide With Grain Boundary Defects During Scratching Processes,
2021
School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
A Molecular Dynamics Study On The Tribological Behavior Of Molybdenum Disulfide With Grain Boundary Defects During Scratching Processes, Boyu Wei, Ning Kong, Jie Zhang, Hongbo Li, Zhenjun Hong, Hongtao Zhu, Yuan Zhuang, Bo Wang
Friction
The effect of grain boundary (GB) defects on the tribological properties of MoS2 has been investigated by molecular dynamics (MD) simulations. The GB defects-containing MoS2 during scratching process shows a lower critical breaking load than that of indentation process, owing to the combined effect of pushing and interlocking actions between the tip and MoS2 atoms. The wear resistance of MoS2 with GB defects is relevant to the misorientation angle due to the accumulation of long Mo-S bonds around the GBs. Weakening the adhesion strength between the MoS2 and substrate is an efficient way to improve …
Micro/Atomic-Scale Vibration Induced Superlubricity,
2021
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China;China Fortune Land Development Industrial Investment Co., Ltd., Beijing 100027, China
Micro/Atomic-Scale Vibration Induced Superlubricity, Shuai Shi, Dan Guo, Jianbin Luo
Friction
With the rapid development of industry, the inconsistency between the rapid increase in energy consumption and the shortage of resources is becoming significant. Friction is one of the main causes of energy consumption; thus, the emergence of superlubricity technology can substantially improve the energy efficiency in motion systems. In this study, an efficient method to control superlubricity at the atomic-scale is proposed. The method employs vibrational excitation, which is called vibration induced superlubricity (VIS). The VIS can be easily and steadily achieved by employing external vibration in three directions. The simple method does not depend on the type of sample …
Temperature-Mediated Tribological Characteristics Of 40crnimoa Steel And Inconel 718 Alloy During Sliding Against Si3N4 Counterparts,
2021
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;Center of Materials Science and Opto-Electronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Temperature-Mediated Tribological Characteristics Of 40crnimoa Steel And Inconel 718 Alloy During Sliding Against Si3N4 Counterparts, Liuyang Bai, Shanhong Wan, Gewen Yi, Yu Shan, Sang The Pham, Anh Kiet Tieu, Yan Li, Rendong Wang
Friction
A comparative evaluation of the friction and wear behaviors of 40CrNiMoA steel and Inconel 718 alloy sliding against Si3N4 counterparts was conducted over a large temperature range from room temperature (RT) to 800 ℃. The temperature-dependent tribological properties associated with the resulting chemical mitigation and structural adaptation of the solid sliding surface were clarified by surface/interface characterizations. The results revealed desirable performance in reducing friction and wear at elevated temperatures, which was associated with the resulting oxide composite film's adaptive lubricating capability, whereas severe abrasive wear occurred at room/ambient temperatures. The oxidative-abrasive differentials for the two alloys …
