Tribological behavior and film-forming mechanism of a polytetrafluoroethylene/polyester fabric composite

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Juan Wang ◽  
Xiongrong Huang ◽  
Wei Wang ◽  
Haosheng Han ◽  
Hongyu Duan ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
High Speed ◽  
Tribological Behavior ◽  
Elemental Content ◽  
Wear Depth ◽  
Content Type ◽  
Pet Fabric ◽  
Forming Mechanism ◽  
Fabric Composite ◽  
Film Forming

Purpose The purpose of this study is to determine the tribological behavior and wear mechanism of a polytetrafluoroethylene (PTFE)/polyester (PET) fabric composite for application as a self-lubricating liner suitable for high-speed and low-load friction conditions. Design/methodology/approach The effects of different loads and sliding speeds on the friction coefficients and wear characteristics of the composite were studied using reciprocating friction tests. Scanning electron microscopy, extended depth-of-field microscopy, and energy-dispersive X-ray spectrometry was used to analyze the worn surface morphology, wear depth and elemental content of the lubrication films, respectively. Findings The friction coefficient curves of the composites presented a long-term steady wear stage under different sliding conditions. With increasing sliding speed, the friction coefficient and wear depth of the composite slowly increased. The film-forming mechanism of the composite revealed that the PTFE/PET ply yarn on the composite surface formed complete PTFE lubrication films at the initial sliding stage. Originality/value The PTFE/PET fabric composite maintained good friction stability and high-speed adaptability, which demonstrates that the composite has broad application prospects as a highly reliable self-lubricating bearing liner with a long lifespan.

scholarly journals Characterization and Tribological Behavior of TiAlN/TiAlCN Multilayer Coatings

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
Zhefeng Lei ◽  
Xiaodong Zhu ◽  
Yanhuai Li ◽  
Zhongxiao Song ◽  
Haiping Liu ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Flow Rate ◽  
Bonding Strength ◽  
High Speed ◽  
Tribological Behavior ◽  
Multilayer Coating ◽  
High Speed Steel ◽  
Multilayer Coatings ◽  
Low Wear ◽  
N2 Flow Rate

Effects of partial pressure of methane on deposition rate, hardness, bonding strength and friction coefficient of TiAlN/TiAlC0.37N0.63 multilayer coating were investigated. The TiAlN coating was deposited at a N2 flow rate of 70 sccm, and TiAlC0.37N0.63 coating were deposited at a N2 flow rate of 35 sccm and a CH4 flow rate of 35 sccm. TiAlN/TiAlC0.37N0.63 multilayer coatings with different modulation periods but the same total thickness of 3.56 μm were deposited on high speed steel (HSS) substrates using multi-arc ion plating technology. Microhardness and tribological measurement show that the multilayer coating with a modulating ratio of 1:1 and a modulation period of 68 nm had a hardness of 2793.9 HV0.10, an excellent bonding strength of 52 N, and the minimum friction coefficient of 0.46 and a relatively low wear rate.

Dry sliding of composites with PBT matrix and micro glass beads on steel

2014 ◽  
Vol 66 (3) ◽  
pp. 424-433 ◽  
Author(s):  
Constantin Georgescu ◽  
Lorena Deleanu ◽  
Mihail Botan
Keyword(s):  
Friction Coefficient ◽  
Tribological Behavior ◽  
Early Stage ◽  
Normal Load ◽  
Glass Beads ◽  
Polybutylene Terephthalate ◽  
Sem Images ◽  
Neat Polymer ◽  
Content Type ◽  
Sliding Distance

Purpose – This research aims to characterize the tribological behavior of polybutylene terephthalate (PBT) and PBT composites with micro glass beads (MGB) on steel, in dry conditions and on a block-on-ring tester, pointing out the influence of sliding distance and speed. The tribology of PBT and its composites is still in an early stage because this thermoplastic polyester requires accurate technological and thermal treatment. Design/methodology/approach – The composites were produced by ICEFS Savinesti Romania and contain PBT grade Crastin6130NC010 (as supplied by Du Pont), 0.5 […] 1.0 per cent (weight) Relamyd B-2Nf (polyamide grade produced by ICEFS, for a better dispersion of MGB), 1 per cent (weight) black carbon for technological and tribological reasons and different micro glass beads (MGB) concentrations (10.0 and 20.0 per cent weight). Tests were done for different sliding distances (2,500, 5,000 and 7,500 m) and speeds (0.5, 1.0 and 1.5 m/s) and a normal load of 5 N. Findings – The friction coefficient and the wear parameter (as mass loss of polymeric blocks) pointed out a good tribological behavior for these composites. Scanning electron microscope (SEM) images revealed particular aspects of PBT local transfer on steel. Also, 10 per cent MGB in PBT reduces wear, especially for longer distances (75,000 m) and higher speeds (0.5 and 0.75 m/s); the friction coefficient is only slightly increased up to 0.23, being less influenced by the speed and the sliding distance as compared to neat polymer. Originality/value – PBT and PBT composites could become challengers for replacing materials in applications similar to tested ones. Even the neat polymer exhibits a good tribological behavior. The composites have a lower sensibility to higher speeds and sliding distances for the applied load.

scholarly journals Study on the Tribological Behavior of Wear and Friction Coefficient on AISI M35 High-Speed Steel with and without DLC Coating

2022 ◽  
Vol 25 ◽  
Author(s):  
Paulo Sérgio Martins ◽  
José Rubens Gonçalves Carneiro ◽  
Elhadji Cheikh Talibouya Ba ◽  
Vitor Ferreira Vieira ◽  
Diego Boaventura Amaral ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
High Speed ◽  
Tribological Behavior ◽  
High Speed Steel ◽  
Dlc Coating ◽  
Wear And Friction

Tribological properties of pyrolytic carbon in high-speed tests

2020 ◽  
pp. 71-75
Author(s):  
V. A. Khorev ◽  
V. I. Rumyantsev ◽  
G. A. Ponomarenko ◽  
A. S. Osmakov ◽  
V. N. Fischev
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
High Speed ◽  
Tribological Behavior ◽  
Pyrolytic Carbon ◽  
Extreme Conditions ◽  
Friction Units ◽  
The Difference

The friction units of modern power turbines require the use of special materials with a stable and low coefficient of friction in extreme conditions. The most successfully used for these purposes are antifriction carbon-graphite materials, in particular isotropic pyrolytic carbon. It is established that isotropic pyrolytic carbon has a lower friction coefficient and wear rate than ATG-S antifriction graphite. Based on the analysis of the microstructure and fractograms of wear traces, it was suggested that the difference in the tribological behavior of materials is caused by various mechanisms of material destruction. It is also shown that isotropic pyrolytic carbon tends to decrease the wear rate and friction coefficient with increasing density. Ill. 7. Ref. 10. Tab. 1.

Tribological behavior of hybrid PTFE/Kevlar fabric composites with different weave densities

2016 ◽  
Vol 68 (2) ◽  
pp. 278-286 ◽  
Author(s):  
HuLin Li ◽  
Zhongwei Yin ◽  
Dan Jiang ◽  
YongJin Li
Keyword(s):  
Tribological Behavior ◽  
Three Dimensional ◽  
Bearing Steel ◽  
Tribological Performance ◽  
Elemental Content ◽  
Wear Volume ◽  
Dry Sliding ◽  
Content Type ◽  
Transfer Films ◽  
Fabric Composites

Purpose – The purpose of this paper is to achieve attractive fabric composites with excellent tribological performance and investigate the wear mechanisms of these fabric composites sliding against bearing steel pins under dry sliding process. Design/methodology/approach – Five different weave density composites were prepared, and the tribological behaviors of these composites were studied at different testing conditions. Scanning electron microscopy, laser microscopy (three-dimensional profile measurements) and energy-dispersive X-ray spectrometry were used to analyze the worn surface morphology, wear volume and elemental content of the transfer films, respectively. Findings – The composite weave density serves an important influence on tribological behavior. Generally, the wear rate of each composite increased with increasing weave density, and the friction coefficient of each composite decreased with increasing weave density. Originality/value – Nanoparticle-filled hybrid polytetrafluoroethylene/Kevlar fabric composites with proper weave density have exhibited superior tribological properties in dry sliding conditions. The results that obtained in this paper may offer a reference for others who intend to achieve attractive fabric composites with excellent tribological performance.

Tribological behaviors of precipitates reinforced Cr-Ni-Mo-V steel lubricated by water or water-silica mixture

2018 ◽  
Vol 70 (8) ◽  
pp. 1431-1436 ◽  
Author(s):  
Shuaishuai Zhu ◽  
Baosen Zhang ◽  
Zhixin Ba ◽  
Xiangyang Mao ◽  
Weijie Fei ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
High Speed ◽  
Brake Disc ◽  
Wear Properties ◽  
Fatigue Wear ◽  
Industrial Firms ◽  
Content Type ◽  
Liquid Cell ◽  
Braking Process ◽  
Worn Surface

Purpose This paper aims to investigate the friction and wear properties of Cr-Ni-Mo-V steel against 440C stainless steel under both water and water–silica mixture lubricant. Design/methodology/approach The Cr-Ni-Mo-V steel specimens were taken from a forged steel brake disc with the process of quenching at 900°C and tempering at 600°C. The tribological testing was performed using a contact configuration of ball-on-flat with a liquid cell according to the ASTM standard. Detailed examinations on the worn surface were analyzed using a scanning electron microscope. Findings The results indicate that the friction coefficient and friction damage of the steel sliding under water–silica mixture are higher than those under water. The friction coefficient decreases with increasing load and increases with the sliding speed for the two lubricants. The mass wear rate presents a rising trend with both sliding load and speed. The wear mechanisms of the Cr-Ni-Mo-V steel sliding under the two lubricants are oxidation wear, abrasive wear and fatigue wear. Research limitations/implications Because of the chosen tribological testing approach, the research results could not describe the tribological performance of the brake disc accurately during actual braking process of the high-speed train. Therefore, researchers are encouraged to test the proposed propositions further. Originality/value This study shows that the tribology behavior of the Cr-Ni-Mo-V steel with water or water–silica mixture lubrications helps the industrial firms and academicians to work on the wear of the brake disc in rainwater or wet environment.

An experimental study on the tribological performance of water-lubricated journal bearings with three different materials

2020 ◽  
Vol 72 (10) ◽  
pp. 1159-1165
Author(s):  
Yanfeng Han ◽  
Lei Yin ◽  
Guo Xiang ◽  
Guangwu Zhou ◽  
Haizhou Chen ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Peer Review ◽  
Tribological Behavior ◽  
Operating Conditions ◽  
Butadiene Rubber ◽  
Test Rig ◽  
Vibration Acceleration ◽  
Content Type ◽  
Rubber Bearing

Purpose The tribological behavior, i.e. friction coefficient and wear rate, and vibration characteristics of the water-lubricated bearing was investigated. The water-lubricated bearing is made of three different materials, i.e. polyether-ether-ketone (PEEK), polyimide (PI) and nitrile-butadiene rubber (NBR). Design/methodology/approach The tribological behavior was investigated experimentally on a specially designed test rig. Three vibration sensors were used to record the vibration of the bearing. Findings The results indicated that the variation of friction coefficient with rotation speed agrees well with the trend of Stribeck curve. The tested friction coefficient of rubber bearing is higher than that of the other two bearings whether it is in the state of mixed-lubrication or hydrodynamic lubrication, and which causing a larger wear rate in rubber bearing. The PEEK bearing exhibits the best tribological properties due to it has smaller friction coefficient and wear rate. However, it can be found that the rubber bearing gives the minimum vibration acceleration, which means that the rubber bearing has the most potential to improve the stability of water-lubricated bearing rotor system. Originality/value In this study, a group of experiment studies conducted on a specially designed test rig. The comprehensive performance, including friction coefficient, vibration acceleration and wear rate, of water-lubricated bearing with three different materials, i.e. PEEK, PI and NBR, was compared systematically. The experiment research may offer a reference for the selection of material in water-lubricated bearing in specific operating conditions. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-10-2019-0447/

Relationship between arrangement patterns and tribological properties of copper-aluminum-graphite materials

2016 ◽  
Vol 68 (2) ◽  
pp. 170-175
Author(s):  
Fei Gao ◽  
Jia Miao ◽  
Xiaoming Han ◽  
Rong Fu ◽  
Jiguang Chen
Keyword(s):  
Friction Coefficient ◽  
High Speed ◽  
Pure Copper ◽  
Test Machine ◽  
Third Body ◽  
Content Type ◽  
Artificial Graphite ◽  
Evolution Characteristics ◽  
Copper Aluminum ◽  
Graphite Sheets

Purpose – Since the multi-component of powder metallurgy was dispersed, and each component sheared flow and tiered under the action of friction force, it was difficult to disclose the evolution characteristics of each component. Meanwhile, third body mixing with particles of each component covered on the friction surface, which further increased the difficulty of understanding evolution of each component and the corresponding third body in the friction process. To solve this problem, this paper aims to propose a mechanical assembled method which compact several component sheets in order. Design/methodology/approach – Pure copper, aluminum and artificial graphite sheets with thickness 0.5, 1 and 2 mm, respectively, were assembled into a jig by mechanical compact method. The relationship between arrangement patterns of the components and its friction coefficient was studied by using fixed speed friction test machine, the speed range from 200 to 2,000 r/min and the pressure range from 0.25 to 0.64 MPa. Findings – The testing results showed that when the distribution of same components was congregated, friction coefficient dropped from 0.6 to 0.4. While the distribution of different components was dispersed, friction coefficient dropped from 0.6 to 0.25. The friction coefficient decline was caused by performances changes of third body fluidity. The sufficiently mixed third body made third body adhesion weaker and increased third body fluidity. That provoked friction coefficient decreasing obviously at high speed. On the contrary, with the high congregation of same components, strong third body adhesion led to a rougher surface which contributed to a higher friction coefficient. Originality/value – By means of the mechanical-assembled multi-layer components to reveal the influence mechanism of every component on friction properties, will provide a new test approach for tribology.

Fretting friction properties of laser surface texture microfilaments

2019 ◽  
Vol 72 (3) ◽  
pp. 427-431
Author(s):  
Ke Li ◽  
Xiuping Dong ◽  
Mingji Huang ◽  
Ping Chen
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Surface Texture ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Textured Surface ◽  
Wear Depth ◽  
Content Type ◽  
Texture Density ◽  
Metal Rubber

Purpose This paper aims to improve the wear resistance of metal rubber microfilaments and the service life. The effect of surface texture by laser processing on the fretting friction properties of metal rubber microfilaments was studied. Design/methodology/approach The LQL-F20A laser marking machine was used to fabricate a ring groove array with equal spacing and dense arrangement on the surface of metal rubber microfilaments. The test was carried out with a self-made micro-dynamic frictional tester. The topography of the microfilaments was observed by scanning electron microscopy and analyzed. Findings It has shown that laser surface texturing can improve the wear performance of microfilaments. Under the same experimental conditions, the microfilaments of textured surface has a smaller depth of wear than un-textured specimen. The wear resistance increases with the increase of texture density. The friction coefficient of textured specimen is significantly reduced compared with un-textured specimen, and the surface texture density of microfilaments has little influence on the friction coefficient after stabilization. In the stage of stable fretting wear, the wear depth will be more with the increase of the load. Originality/value There is little research on metal rubber microfilaments tribological properties. In this paper, the effect of laser texturing of microfilaments on micro-dynamic friction properties was studied by friction machine to provide a reference for the application of metal rubber in aerospace, medical and other fields.

The investigation of tribological behavior of carbon fiber-reinforced composite materials

2018 ◽  
Vol 72 (2) ◽  
pp. 211-216
Author(s):  
İsmail Kaya ◽  
Zeynep Parlar
Keyword(s):  
Friction Coefficient ◽  
Carbon Fiber ◽  
Fiber Orientation ◽  
Tribological Behavior ◽  
Epoxy Composite ◽  
Sliding Velocity ◽  
Fiber Reinforced ◽  
Content Type ◽  
Carbon Fiber Reinforced ◽  
Sliding Distance

Purpose The tribological behavior of composites varies on matrices materials, the reinforcement material and the direction of reinforcement materials. The purpose of this study is to examine the effects of fiber orientation on the tribological properties of carbon fiber–reinforced epoxy composite. Design/methodology/approach The experiments were carried out with a pin-on-ring tribometer. The tests were executed according to three different parameters: load, sliding velocity and direction of reinforcement. Loads measuring 92 N and 150 N were applied at sliding velocities of 1 and 2 m/s, in parallel, antiparallel and normal directions of fiber reinforcements. The frictional force was read every 500 m of sliding distance. To calculate specific wear rate, the mass of the samples was measured before and after each experiment. Moreover, temperature was measured every 1000 m of sliding distance via three-point infrared thermometer, to examine the effect of temperature variations. The sample surfaces were also examined in optic microscope after the experiments. Higher friction coefficient values were obtained in the normal direction-oriented carbon fiber specimen. Findings Comparing the friction coefficient values, antiparallel and parallel direction-oriented carbon fiber specimens gave lower friction coefficient values. The increase of sliding velocity and normal load resulted in the increase of surface temperature and this lead to the increase of friction coefficient. Originality/value This study shows the effects of fiber orientation on the tribological behavior of carbon fiber–reinforced epoxy composite. According to fiber orientations, relatively moving counter surfaces of this material shows different tribological behaviors.

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