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Articles 1 - 30 of 612
Full-Text Articles in Tribology
Effect Of Lubricant Type On Deep Drawing Ratio And Drawing Force During Cylindrical Cup Deep Drawing, Walid M. Shewakh
Effect Of Lubricant Type On Deep Drawing Ratio And Drawing Force During Cylindrical Cup Deep Drawing, Walid M. Shewakh
Emirates Journal for Engineering Research
Cylindrical cup deep drawing technology is used in various manufacturing processes. For example, it is used in the automotive industry to manufacture auto parts. It is also used in the manufacture of household items. Lubricants are used in metal forming, especially deep drawing, to reduce friction between the tool and the workpiece. As a result, lubrication reduces forming energy and forming steps, increases the drawing ratio and tool life, while preventing galling, seizure and surface damages to the products. In this paper, the main purpose was to increase the deep drawing ratio and reduce the drawing force by angling the …
Tailored Surface Textures To Increase Friction—A Review, Henara L. Costa, Jörg Schille, Andreas Rosenkranz
Tailored Surface Textures To Increase Friction—A Review, Henara L. Costa, Jörg Schille, Andreas Rosenkranz
Friction
Surface textures with micro-scale feature dimensions still hold great potential to enhance the frictional performance of tribological systems. Apart from the ability of surface texturing to reduce friction, surface textures can also be used to intentionally increase friction in various applications that rely on friction for their adequate functioning. Therefore, this review aims at presenting the state-of-the-art regarding textured surfaces for high-friction purposes. After a brief general introduction, the recent trends and future paths in laser surface texturing are summarized. Then, the potential of surface textures to increase friction in different applications including adhesion, movement transmission and control, biomimetic applications, …
Role Of Nanoparticles In Achieving Macroscale Superlubricity Of Graphene/Nano-Sio2 Particle Composites, Panpan Li, Li Ji, Hongxuan Li, Lei Chen, Xiaohong Liu, Huidi Zhou, Jianmin Chen
Role Of Nanoparticles In Achieving Macroscale Superlubricity Of Graphene/Nano-Sio2 Particle Composites, Panpan Li, Li Ji, Hongxuan Li, Lei Chen, Xiaohong Liu, Huidi Zhou, Jianmin Chen
Friction
Recent studies have reported that adding nanoparticles to graphene enables macroscale superlubricity to be achieved. This study focuses on the role of nanoparticles in achieving superlubricity. First, because graphene nanoscrolls can be formed with nanoparticles as seeds under shear force, the applied load (or shear force) is adjusted to manipulate the formation of graphene nanoscrolls and to reveal the relationship between graphene-nanoscroll formation and superlubricating performance. Second, the load-carrying role of spherical nano-SiO2 particles during the friction process is verified by comparison with an elaborately designed fullerene that possesses a hollow-structured graphene nanoscroll. Results indicate that the incorporated nano-SiO …
Optimization Of Pore Structure And Wet Tribological Properties Of Paper-Based Friction Materials Using Chemical Foaming Technology, Chang Li, Jie Fei, Enzhi Zhou, Rui Lu, Xiaohang Cai, Yewei Fu, Hejun Li
Optimization Of Pore Structure And Wet Tribological Properties Of Paper-Based Friction Materials Using Chemical Foaming Technology, Chang Li, Jie Fei, Enzhi Zhou, Rui Lu, Xiaohang Cai, Yewei Fu, Hejun Li
Friction
Paper-based friction materials are porous materials that exhibit anisotropy; they exhibit random pore sizes and quantities during their preparation, thereby rendering the control of their pore structure difficult. Composites with different pore structures are obtained by introducing chemical foaming technology during their preparation to regulate their pore structure and investigate the effect of pore structure on the properties of paper-based friction materials. The results indicate that the skeleton density, total pore area, average pore diameter, and porosity of the materials increase after chemical foaming treatment, showing a more open pore structure. The addition of an organic chemical foaming agent improves …
Numerical Study On Butterfly Wings Around Inclusion Based On Damage Evolution And Semi-Analytical Method, Ye Zhou, Caichao Zhu, Xiaojin Chen, Wei Ye
Numerical Study On Butterfly Wings Around Inclusion Based On Damage Evolution And Semi-Analytical Method, Ye Zhou, Caichao Zhu, Xiaojin Chen, Wei Ye
Friction
Butterfly wings are closely related to the premature failure of rolling element bearings. In this study, butterfly formation is investigated using the developed semi-analytical three-dimensional (3D) contact model incorporating inclusion and material property degradation. The 3D elastic field introduced by inhomogeneous inclusion is solved by using numerical approaches, which include the equivalent inclusion method (EIM) and the conjugate gradient method (CGM). The accumulation of fatigue damage surrounding inclusions is described using continuum damage mechanics. The coupling between the development of the damaged zone and the stress field is considered. The effects of the inclusion properties on the contact status and …
Reclined Trend Of Alkyl Chain Of Sodium Dodecylbenzenesulfonate Molecules Induced By Friction, Xianzhang Wang, Yuan Liu, Liran Ma, Xuefeng Xu, Yu Tian
Reclined Trend Of Alkyl Chain Of Sodium Dodecylbenzenesulfonate Molecules Induced By Friction, Xianzhang Wang, Yuan Liu, Liran Ma, Xuefeng Xu, Yu Tian
Friction
Surfactants tend to adsorb on the surface/interface mostly in a directional manner. The alkyl chain orientation and conformation order for molecular monolayers of sodium dodecylbenzenesulfonate (SDBS) at low concentrations are studied by using the sum frequency generation vibrational spectroscopy (SFG-VS). The molecular arrangement of the surfactants adsorbed at the solid/liquid interface is further investigated. It is found that the arrangement of the SDBS at the interface becomes relatively ordered with increasing bulk concentration. Meanwhile, the orientation angle reduces gradually, and the molecules tend to be upright state. In addition, the effect of friction on the conformation order and orientation angle …
Macroscale Superlubricity Achieved Via Hydroxylated Hexagonal Boron Nitride Nanosheets With Ionic Liquid At Steel/Steel Interface, Zhiwen Zheng, Xiaolong Liu, Guowei Huang, Haijie Chen, Hongxiang Yu, Dapeng Feng, Dan Qiao
Macroscale Superlubricity Achieved Via Hydroxylated Hexagonal Boron Nitride Nanosheets With Ionic Liquid At Steel/Steel Interface, Zhiwen Zheng, Xiaolong Liu, Guowei Huang, Haijie Chen, Hongxiang Yu, Dapeng Feng, Dan Qiao
Friction
Macroscale superlubricity is a prospective strategy in modern tribology to dramatically reduce friction and wear of mechanical equipment; however, it is mainly studied for point-to-surface contact or special friction pairs in experiments. In this study, a robust macroscale superlubricity for point-to-point contact on a steel interface was achieved for the first time by using hydroxylated modified boron nitride nanosheets with proton-type ionic liquids (ILs) as additives in ethylene glycol aqueous (EGaq). The detailed superlubricity process and mechanism were revealed by theoretical calculations and segmented experiments. The results indicate that hydration originating from hydrated ions can significantly reduce the …
Robustness Of Structural Superlubricity Beyond Rigid Models, Shizhe Feng, Zhiping Xu
Robustness Of Structural Superlubricity Beyond Rigid Models, Shizhe Feng, Zhiping Xu
Friction
Structural superlubricity is a theoretical concept stating that the friction force is absent between two rigid, incommensurate crystalline surfaces. However, elasticity of the contact pairs could modify the lattice registry at interfaces by nucleating local slips, favoring commeasure. The validity of structural superlubricity is thus concerned for large-scale systems where the energy cost of elastic distortion to break the lattice registry is low. In this work, we study the size dependence of superlubricity between single-crystal graphite flakes. Molecular dynamics simulations show that with nucleation and propagation of out-of-plane dislocations and strained solitons at Bernal interfaces, the friction force is reduced …
Polyethylene Glycol Derived Carbon Quantum Dots Nanofluids: An Excellent Lubricant For Diamond-Like Carbon Film/Bearing Steel Contact, Fu Wang, Lunlin Shang, Guangan Zhang, Zhaofeng Wang
Polyethylene Glycol Derived Carbon Quantum Dots Nanofluids: An Excellent Lubricant For Diamond-Like Carbon Film/Bearing Steel Contact, Fu Wang, Lunlin Shang, Guangan Zhang, Zhaofeng Wang
Friction
Polyethylene glycol derived carbon quantum dots nanofluids were synthesized via a slow thermal oxidation process. The size of carbon quantum dots was ca. 2 nm and had a decreasing trend with the increase of oxidation time. When used as lubricant in a diamond-like carbon film/bearing steel interface, the nanofluids achieved an ultra-low friction coefficient (μ ≈ 0.02), much lower than that of original polyethylene glycol (μ = 0.12). The worn surface analyses revealed that the nanofluids could effectively inhibit the tribo-oxidation of steel counterpart that occurred under original polyethylene glycol lubrication, and hence reduced the abrasion component of friction. Especially, …
Ionic Liquids As Boundary Additives In Water-Based And Pao Lubricants, Wahyu Wijanarko, Hamid Khanmohammadi, Nuria Espallargas
Ionic Liquids As Boundary Additives In Water-Based And Pao Lubricants, Wahyu Wijanarko, Hamid Khanmohammadi, Nuria Espallargas
Friction
Ionic liquids have been widely discussed as potential lubricants, however, their properties make them also very good potential candidates as lubricant additives (e.g., friction modifiers and anti-wear). In this work, the tribological study of two ionic liquids (tributylmethylphosphonium dimethylphosphate (PP), and 1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl)trifluorophosphate (BMP)) as lubricant additives has been performed on stainless steel (AISI 316L) exposed to polar (water-glycol) and non-polar (polyalphaolefin) based lubricants under boundary lubricating conditions. The performance of these ionic liquids as lubricant additives has been compared to a classical organic friction modifier (dodecanoic acid (C12)). The water–glycol lubricant formulated with the two ionic liquids showed friction …
High Temperature Induced "Glaze" Layer Formed In Hvof-Sprayed Nicrwmocucbfe Coating And Its Wear Reduction Mechanism, Yijing Wang, Xiaoqin Zhao, Enkang Hao, Zhenyu Bu, Yulong An, Huidi Zhou, Jianmin Chen
High Temperature Induced "Glaze" Layer Formed In Hvof-Sprayed Nicrwmocucbfe Coating And Its Wear Reduction Mechanism, Yijing Wang, Xiaoqin Zhao, Enkang Hao, Zhenyu Bu, Yulong An, Huidi Zhou, Jianmin Chen
Friction
The in-situ formation of oxides on alloy surface induced by high temperature can effectively reduce wear and resist oxidation. In consideration of the solid solution strengthening effect and great oxidation resistance of additional elements at elevated temperature, the NiCrWMoCuCBFe coating was prepared by high velocity oxygen flame (HVOF) spraying technology, and its tribological behavior was scrutinized from 25 to 800 °C. By means of high temperature Vickers hardness tester and high temperature X-ray diffractometer, the mechanical properties and microstructures of NiCrWMoCuCBFe coating were measured. And the effect of the mechanical properties and microstructures of the coating on tribological performance was …
An Investigation Into The Velocity-Dependence Of The Coefficient Of Friction Between Concrete And Maraging Steel, Trace A. Duncan
An Investigation Into The Velocity-Dependence Of The Coefficient Of Friction Between Concrete And Maraging Steel, Trace A. Duncan
Theses and Dissertations
This work investigates the velocity-dependent coefficient of friction between concrete and 300 Maraging steel over short displacements. A modified torsional Hopkinson bar is utilized for rotating thin-walled steel rings in contact with a concrete disk under static precompression. Rotational velocity is varied between tests to determine the velocity dependence of the friction coefficient. Normal force is varied between certain tests to determine the pressure dependence of the friction coefficient between the concrete and steel. Three different types of concrete are tested to deduce any composition effect on the friction coefficient. Dry and greased conditions’ impact on the friction coefficient are …
An Advanced Efficient Model For Adhesive Wear In Elastic–Plastic Spherical Contact, Haibo Zhang, Izhak Etsion
An Advanced Efficient Model For Adhesive Wear In Elastic–Plastic Spherical Contact, Haibo Zhang, Izhak Etsion
Friction
A finite element (FE) model combining submodel technique is presented for the adhesive wear in elastic–plastic spherical contact. It consists of a global model, showing the potential location of fracture under combined normal and tangential loading, and a refined mesh submodel covering only the region near the potential fracture. This allows to describe the morphology of wear particle more accurately than that in a previously developed model by the authors. A range of normal loading is studied to show its effect on the shape and volume of wear particles. Two main regimes of mild and severe wear (along with a …
Unlocking The Secrets Behind Liquid Superlubricity: A State-Of-The-Art Review On Phenomena And Mechanisms, Tianyi Han, Shuowen Zhang, Chenhui Zhang
Unlocking The Secrets Behind Liquid Superlubricity: A State-Of-The-Art Review On Phenomena And Mechanisms, Tianyi Han, Shuowen Zhang, Chenhui Zhang
Friction
Superlubricity, the state of ultralow friction between two sliding surfaces, has become a frontier subject in tribology. Here, a state-of-the-art review of the phenomena and mechanisms of liquid superlubricity are presented based on our ten-year research, to unlock the secrets behind liquid superlubricity, a major approach to achieve superlubricity. An overview of the discovery of liquid superlubricity materials is presented from five different categories, including water and acid-based solutions, hydrated materials, ionic liquids (ILs), two-dimensional (2D) materials as lubricant additives, and oil-based lubricants, to show the hydrodynamic and hydration contributions to liquid superlubricity. The review also discusses four methods to …
Preparation And Wear Properties Of High-Vanadium Alloy Composite Layer, Fangfang Wang, Liujie Xu, Shizhong Wei, Xi Wang, Chong Chen, Yucheng Zhou
Preparation And Wear Properties Of High-Vanadium Alloy Composite Layer, Fangfang Wang, Liujie Xu, Shizhong Wei, Xi Wang, Chong Chen, Yucheng Zhou
Friction
A high-vanadium alloy composite layer was prepared on the surface of a carbon steel using cast composite technology, and the wear properties of the composite layer were investigated. The results showed that the microstructure of the composite layer was composed of primary vanadium carbides (VC), flake martensite, residual austenite, and fine VC. The hardness of the cast alloy layer was 63 HRC. The abrasive wear resistance and impact wear resistance were increased by 60% and 26%, respectively, compared with those of high-chromium cast iron. The excellent wear resistance of the cast alloy layer is attributed to the high-hardness primary vanadium …
Bio-Inspired Smart Surface To Achieve Controllable Locomotion Through Adjustable Anisotropic Friction, Zhongying Ji, Shiyu Qin, Shuanhong Ma, Xin Jia, Xiaolong Wang, Feng Zhou
Bio-Inspired Smart Surface To Achieve Controllable Locomotion Through Adjustable Anisotropic Friction, Zhongying Ji, Shiyu Qin, Shuanhong Ma, Xin Jia, Xiaolong Wang, Feng Zhou
Friction
Anisotropic friction generated by microstructured surfaces is crucial for performing functions such as directional locomotion and adhesion in biological systems. Hence, an epoxy-based shape memory polymer (SMP) incorporating Fe3O4 nanoparticles is used in this study to create a smart surface with oriented structures to mimic anisotropic friction and exploit human-developed controllable locomotion systems. Applying the specific properties of the epoxy-based SMP, fast switching friction can be achieved by adjusting the topography and stiffness of the microstructures on the surface. In addition, the photothermogenesis effect of Fe3O4 nanoparticles induces changes in the asymmetric topography and …
Robust Scalable Reversible Strong Adhesion By Gecko-Inspired Composite Design, Xiaosong Li, Pengpeng Bai, Xinxin Li, Lvzhou Li, Yuanzhe Li, Hongyu Lu, Liran Ma, Yonggang Meng, Yu Tian
Robust Scalable Reversible Strong Adhesion By Gecko-Inspired Composite Design, Xiaosong Li, Pengpeng Bai, Xinxin Li, Lvzhou Li, Yuanzhe Li, Hongyu Lu, Liran Ma, Yonggang Meng, Yu Tian
Friction
Bio-inspired reversible adhesion has significant potential in many fields requiring flexible grasping and manipulation, such as precision manufacturing, flexible electronics, and intelligent robotics. Despite extensive efforts for adhesive synthesis with a high adhesion strength at the interface, an effective strategy to actively tune the adhesion capacity between a strong attachment and an easy detachment spanning a wide range of scales has been lagged. Herein, we report a novel soft-hard-soft sandwiched composite design to achieve a stable, repeatable, and reversible strong adhesion with an easily scalable performance for a large area ranging from ~1.5 to 150 cm2 and a high …
Role Of Capillary Adhesion In The Friction Peak During The Tacky Transition, Tianyan Gao, Jiaxin Ye, Kaisen Zhang, Xiaojun Liu, Yan Zhang, Kun Liu
Role Of Capillary Adhesion In The Friction Peak During The Tacky Transition, Tianyan Gao, Jiaxin Ye, Kaisen Zhang, Xiaojun Liu, Yan Zhang, Kun Liu
Friction
The friction peak that occurs in tire–road sliding when the contact changes from wet to dry was previously attributed to capillary cohesion, van der Waals attraction, and surface roughness, but the detailed mechanisms have yet to be revealed. In this study, friction and static contact experiments were conducted using a custom-built in situ optical microtribometer, which allowed us to investigate the evolution of the friction, normal load, and contact area between a polydimethylsiloxane (PDMS) film and a silicon nitride ball during water volatilization. The friction coefficient increased by 100%, and the normal force dropped by 30% relative to those in …
Optimization Of Several Surface Treatment Processes For Alleviating Fretting Damage Of A Locking Pin, Jifan He, Zhenbing Cai, Yanping Ren, Jinfang Peng, Jianhua Liu, Minhao Zhu
Optimization Of Several Surface Treatment Processes For Alleviating Fretting Damage Of A Locking Pin, Jifan He, Zhenbing Cai, Yanping Ren, Jinfang Peng, Jianhua Liu, Minhao Zhu
Friction
The operational safety and reliability of a variable gauge train are affected by the anti-fretting wear performance of the locking mechanism. The main purpose of this study is to optimize the surface treatment process for a locking pin material under actual service conditions to alleviate fretting damage. Based on the two basic principles of surface strengthening and friction reduction, a substrate (AISI 4135 steel) surface was treated by laser quenching (LQ), plasma nitriding (PN), and bonded MoS2 coating. Systematic fretting wear tests were conducted, and the wear behavior and damage mechanism of various treated surfaces were comprehensively investigated. The …
Laser Pattern-Induced Unidirectional Lubricant Flow For Lubrication Track Replenishment, Chenglong Liu, Feng Guo, Patrick Wong, Xinming Li
Laser Pattern-Induced Unidirectional Lubricant Flow For Lubrication Track Replenishment, Chenglong Liu, Feng Guo, Patrick Wong, Xinming Li
Friction
Effective oil replenishment to the lubrication track of a running bearing is crucial to its sustainable operation. Reliable practical solutions are rare despite numerous theoretical studies were conducted in the last few decades. This paper proposes the use of surface effect, wettability gradient, to achieve the goal. This method is simple and can be nicely implemented using femtosecond laser ablation. A periodic comb-tooth-shaped pattern with anisotropic wetting capability is devised and its effect on the anisotropic spreading behaviour of an oil droplet is studied. Results show that the comb-tooth-shaped pattern enables the rearrangement of oil distribution, thereby escalating oil replenishment …
Tribological Performance And Scuffing Behaviors Of Several Automobile Piston Rings Mating With Chrome-Plated Cylinder Liner, Zeyu Ma, Ruoxuan Huang, Xiaoshuai Yuan, Yan Shen, Jiujun Xu
Tribological Performance And Scuffing Behaviors Of Several Automobile Piston Rings Mating With Chrome-Plated Cylinder Liner, Zeyu Ma, Ruoxuan Huang, Xiaoshuai Yuan, Yan Shen, Jiujun Xu
Friction
The friction and wear properties, as well as the scuffing resistance, of different piston-ring coatings mating with a chrome-plated cylinder liner were investigated. Interrupted wear tests under the lubricant starvation condition were conducted to examine the wear behavior of Cr-diamond coating (GDC) and diamond-like coating (DLC). The results indicated that the DLC coating had outstanding tribological properties (small coefficient of friction and wear loss) at 150 °C, while the GDC coating exhibited better performance at an elevated temperature (240 °C). The DLC coating had a better scuffing resistance; no material adhesion occurred for 70 min under the unlubricated condition. The …
Load Dependent Microstructural Evolution In An As-Cast 26% Cr High Chromium Cast Iron During Unlubricated Sliding, U. Pranav Nayak, Sebastian Suárez, Valentin Pesnel, Frank Mücklich, María Agustina Guitar
Load Dependent Microstructural Evolution In An As-Cast 26% Cr High Chromium Cast Iron During Unlubricated Sliding, U. Pranav Nayak, Sebastian Suárez, Valentin Pesnel, Frank Mücklich, María Agustina Guitar
Friction
In the current study, an as-cast 26% Cr high chromium cast iron (HCCI) alloy was subjected to dry-sliding linear wear tests, under different loads. The loads were selected based on analytically computing the critical load (PC) i.e., the load necessary to induce plastic deformation. The PC was calculated to be 15 N and accordingly, a sub-critical load (5 N) and an over-critical load (20 N) were chosen. The influence of increasing the load during the wear test was investigated in terms of the matrix microstructural behaviour and its ability to support the surrounding carbides. The morphological aspects …
Motion And Crosslinked Polyethylene Wear In Reverse Total Shoulder Arthroplasty, Christopher Millward
Motion And Crosslinked Polyethylene Wear In Reverse Total Shoulder Arthroplasty, Christopher Millward
Electronic Thesis and Dissertation Repository
The reverse total shoulder arthroplasty (RTSA) has quickly grown to become the most commonly used shoulder arthroplasty design; however, reports have shown evidence of RTSA failures related to polyethylene wear and damage. Therefore, the present work investigated the wear of crosslinked polyethylene (XLPE) in environments similar to that of an in vivo RTSA. Additionally, a computational model was developed based on a previous study of the shoulder motions obtained from a selection of typical patients with RTSA. This model quantified the amount of glenohumeral motion that an RTSA may be subjected to in vivo and provided an approximate value for …
Water Lubrication Of Graphene Oxide-Based Materials, Shaoqing Xue, Hanglin Li, Yumei Guo, Baohua Zhang, Jiusheng Li, Xiangqiong Zeng
Water Lubrication Of Graphene Oxide-Based Materials, Shaoqing Xue, Hanglin Li, Yumei Guo, Baohua Zhang, Jiusheng Li, Xiangqiong Zeng
Friction
Water is as an economic, eco-friendly, and efficient lubricant that has gained widespread attention for manufacturing. Using graphene oxide (GO)-based materials can improve the lubricant efficacy of water lubrication due to their outstanding mechanical properties, water dispersibility, and broad application scenarios. In this review, we offer a brief introduction about the background of water lubrication and GO. Subsequently, the synthesis, structure, and lubrication theory of GO are analyzed. Particular attention is focused on the relationship between pH, concentration, and lubrication efficacy when discussing the tribology behaviors of pristine GO. By compounding or reacting GO with various modifiers, amounts of GO-composites …
Mechanochemical Reactions Of Gan–Al2O3 Interface At The Nanoasperity Contact: Roles Of Crystallographic Polarity And Ambient Humidity, Jian Guo, Jian Gao, Chen Xiao, Lei Chen, Linmao Qian
Mechanochemical Reactions Of Gan–Al2O3 Interface At The Nanoasperity Contact: Roles Of Crystallographic Polarity And Ambient Humidity, Jian Guo, Jian Gao, Chen Xiao, Lei Chen, Linmao Qian
Friction
Mechanochemical reactions of the GaN–Al2O3 interface offer a novel principle for scientific and technological merits in the micro-/nano-scale ultra-precision surface machining. In this work, the mechanochemical reactions on Ga- and N-faced GaN surfaces rubbed by the Al2O3 nanoasperity as a function of the environmental humidity were investigated. Experimental results indicate that the N-face exhibits much stronger mechanochemical removal over the relative humidity range of 20%–80% than the Ga-face. Increasing water molecules in environmental conditions significantly promotes the interfacial mechanochemical reactions and hence accelerates the atomic attrition on N-face. The hypothesized mechanism of the selective …
Capillary Electroosmosis Properties Of Water Lubricants With Different Electroosmotic Additives Under A Steel-On-Steel Sliding Interface, Bohua Feng, Zhiqiang Luan, Tao Zhang, Jiawei Liu, Xiaodong Hu, Jiju Guan, Xuefeng Xu
Capillary Electroosmosis Properties Of Water Lubricants With Different Electroosmotic Additives Under A Steel-On-Steel Sliding Interface, Bohua Feng, Zhiqiang Luan, Tao Zhang, Jiawei Liu, Xiaodong Hu, Jiju Guan, Xuefeng Xu
Friction
The process of lubricant penetration into frictional interfaces has not been fully established, hence compromising their tribological performance. In this study, the penetration characteristics of deionized water (DI water) containing an electroosmotic suppressant (cetyltrimethylammonium bromide (CTAB)) and an electroosmotic promoter (sodium lauriminodipropionate (SLI)), were investigated using steel-on-steel friction pairs. The results indicated that the lubricant with electroosmotic promoter reduced the coefficient of friction and wear scar diameter, whereas that with an electroosmotic suppressant exhibited an opposite behavior compared with DI water. The addition of SLI promoted the penetration of the DI water solution, thus resulting in the formation of a …
Influence Of The Cage On The Migration And Distribution Of Lubricating Oil Inside A Ball Bearing, He Liang, Yu Zhang, Wenzhong Wang
Influence Of The Cage On The Migration And Distribution Of Lubricating Oil Inside A Ball Bearing, He Liang, Yu Zhang, Wenzhong Wang
Friction
The migration and distribution of lubricant oil in a rolling bearing strongly affect the elastohydrodynamic lubrication performance between the balls and rings. However, oil re-lubrication is highly dependent on the bearing design, which is different from the ball-on-disc model. This study directly observed the distribution of the lubricant film in a custom-made model-bearing rig, with an outer ring replaced by a glass ring to allow full optical access. The influence of the cage type and surface properties were presented. The physical origin of the re-lubrication mechanism, including capillary flow and mechanical redistribution, was discussed.
Constructing A Biomimetic Robust Bi-Layered Hydrophilic Lubrication Coating On Surface Of Silicone Elastomer, Luyao Gao, Xiaoduo Zhao, Shuanhong Ma, Zhengfeng Ma, Meirong Cai, Yong-Min Liang, Feng Zhou
Constructing A Biomimetic Robust Bi-Layered Hydrophilic Lubrication Coating On Surface Of Silicone Elastomer, Luyao Gao, Xiaoduo Zhao, Shuanhong Ma, Zhengfeng Ma, Meirong Cai, Yong-Min Liang, Feng Zhou
Friction
Silicone elastomers-based materials have been extensively involved in the field of biomedical devices, while their use is extremely restricted due to the poor surface lubricity and inherent hydrophobicity. This paper describes a novel strategy for generating a robust layered soft matter lubrication coating on the surface of the polydimethylsiloxane (PDMS) silicone elastomer, by entangling thick polyzwitterionic polyelectrolyte brush of poly (sulfobetaine methacrylate) (PSBMA) into the sub-surface of the initiator-embedded stiff hydrogel coating layer of P(AAm-co-AA-co-HEMA–Br)/Fe, to achieve a unified low friction and high load-bearing properties. Meanwhile, the stiff hydrogel layer with controllable thickness is covalently anchored on the surface of …
Effects Of Annealing Treatment On Tribological Behavior Of Tungsten-Doped Diamond-Like Carbon Film Under Lubrication (Part 2): Tribological Behavior Under Modtc Lubrication, Shaojun Zhang, Lina Zhu, Yanyan Wang, Jiajie Kang, Haidou Wang, Guozheng Ma, Haipeng Huang, Guang’An Zhang, Wen Yue
Effects Of Annealing Treatment On Tribological Behavior Of Tungsten-Doped Diamond-Like Carbon Film Under Lubrication (Part 2): Tribological Behavior Under Modtc Lubrication, Shaojun Zhang, Lina Zhu, Yanyan Wang, Jiajie Kang, Haidou Wang, Guozheng Ma, Haipeng Huang, Guang’An Zhang, Wen Yue
Friction
Molybdenum dialkyldithiocarbamate (MoDTC) is widely used as a friction modifier in engine lubricating oil. Under MoDTC lubrication, the friction and wear behaviors of tungsten-doped diamond-like carbon (W-DLC) films annealed at 100–400 °C were discussed and evaluated using scanning electron microscopy (SEM), atomic force microscopy (AFM), and Raman spectroscopy. Under (polymerized alpha olefin) PAO + MoDTC lubrication, the coefficient of friction of all samples decreased, but the wear rates of the W-DLC films annealed at 300 °C increased significantly. By interacting with zinc dialkyldithiophosphate (ZDDP), the wear rates of W-DLC films annealed at different temperatures declined significantly owing to the formation …
Photorheological Fluids Of Azobenzene Polymers For Lubrication Regulation, Shuangxi Tang, Shayu Li, Liran Ma, Yu Tian
Photorheological Fluids Of Azobenzene Polymers For Lubrication Regulation, Shuangxi Tang, Shayu Li, Liran Ma, Yu Tian
Friction
Fluid viscosity is ubiquitous property and is of practical importance in intelligent fluids, industrial lubrication, and pipeline fluid transportation. Recently, there has been a surging interest in viscosity regulation. Here, we have developed a group of photorheological fluids by utilizing azobenzene polymers with a light-induced microstructure transformation. In this work, a photosensitive polymer with 4,4'-bis-hydroxyazobenzene as the main chain was designed and synthesized as a pivotal functional material. The sufficiently large structural difference under ultraviolet and near-infrared light makes it possible to regulate the viscosity of a polyethylene glycol solution. The viscosity of the photosensitive rheological fluids under ultraviolet light …