Research on the Tribological Properties of SF Polymer Water-Lubricated Bearings

2010 ◽  
Vol 150-151 ◽  
pp. 102-107 ◽  
Author(s):  
Zhu Xin Wu ◽  
Lin Liu Zheng ◽  
Fa Xiao Fan
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Load Capacity ◽  
Low Friction ◽  
Swelling Properties ◽  
Shipbuilding Industry ◽  
Simulation Testing ◽  
New Type ◽  
Water Swelling ◽  
High Load Capacity

In the paper, the SF polymer water lubricated bearings is taken as the research objects. Both material testing and bearing simulation testing are carried out to research the tribological properties of bearings including water swelling properties, friction coefficient, and wear-resistant properties mainly. The results show that the SF material, which is a new type of material used in water lubricated tail bearing, has the characteristics of low friction coefficient, high load capacity, good wear-resistance, excellent self-lubricating properties, and low water swelling, which has a broad application in the shipbuilding industry.

scholarly journals Multilayered-Sheet Hot Stamping and Application in Electric-Power-Fitting Products

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 215 ◽  
Author(s):  
Bin Zhu ◽  
Zhoujie Zhu ◽  
Yongmin Jin ◽  
Kai Wang ◽  
Yilin Wang ◽  
...  
Keyword(s):  
Contact Pressure ◽  
Load Capacity ◽  
Hot Stamping ◽  
High Strength ◽  
Optimal Number ◽  
Electrical Connection ◽  
Number Of Layers ◽  
Stamping Process ◽  
New Type ◽  
High Load Capacity

Traditional electric transmission line fittings, which are always manufactured from thick metal slabs, possess the disadvantage of heavy weight. In this study, a new type of electrical-connection-fitting, clevis-clevis component made of high-strength steel is developed to reduce weight, and a new hot-stamping process for multilayered sheets is proposed to manufacture the component efficiently. First, the structure of the new clevis-clevis component is designed, and the corresponding tool is developed. Second, a flat-tool heat transfer experiment is conducted. The influence of the number of layers and contact pressure on the cooling rate of each sheet is investigated. The optimizing number of layers and contact pressure for the multilayered-sheet, hot-stamping process are obtained. The optimal number of layers is two, and the optimal contact pressure is more than 20 MPa. The final microstructure of each sheet is fully martensitic, and the strength is about 1500 MPa. Finally, U-shaped, double-layer-sheet hot stamping is implemented to produce a typical electrical-connection-fitting, clevis-clevis component. The bearing capacity of a four-layered clevis-clevis is tested through numerical and experimental methods. The new connection-fitting clevis-clevis component exhibits a high load capacity of 280 kN. Compared with that of the traditional component, the weight of the new component is reduced by 60%.

Assessment of Tribological Properties of Low Friction Thin Layers Produced by Vacuum Methods

2019 ◽  
Vol 293 ◽  
pp. 125-140
Author(s):  
Agnieszka Paradecka ◽  
Krzysztof Lukaszkowicz ◽  
Jozef Sondor
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Chemical Analysis ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Structural Changes ◽  
Thin Layers ◽  
Low Friction ◽  
Topographic Analysis ◽  
Steel Substrates

Low friction thin layers are an excellent alternative for conventional coatings. They provide increased life of the elements, to which they were applied, due to enhancing the hardness or chemical and electrochemical resistance. They help to avoid the cracks, oxidation, as well as possible structural changes during the element's work. However, they primarily improve tribological properties by increasing wear resistance and reducing the friction. This also applies to components operating under variable conditions such as load, speed, temperature. The presented article analyzes the properties of various low-friction thin layers deposited by vacuum methods on the steel substrates. DLC, TiC, MoS2, CrCN thin layers were chosen, as they achieve the lowest possible coefficient of friction. In the framework of this work the measurements of adhesion of the investigated layers to the substrate as well as the friction coefficient, chemical analysis, microstructure and topographic analysis of the low-friction layers were carried out.

New Type of Transmission Screw Nuts With Structure of Steel-Backing/Self-Lubrication Composite Lining

2012 ◽  
Author(s):  
Yousong Sun ◽  
Xianhui Zhou ◽  
Yongqi Cheng ◽  
Liangmo Wei ◽  
Chunmei Li
Keyword(s):  
Friction Coefficient ◽  
Carbon Fiber ◽  
Transmission Efficiency ◽  
The Other ◽  
Carbon Fabric ◽  
Low Friction ◽  
Metal Metal ◽  
New Type ◽  
Composite Lining ◽  
Carbon Fiber Epoxy

Transmission screw nuts with structure of steel-backing/self-lubrication composite lining have the advantages of high bearing capacity and low friction coefficient. Two materials and fabricating methods of linings were developed for the new screw nuts. Lubrication grooves on the female thread surfaces of the nuts were made during fabricating. One material was based on Carbon-Fabric/Epoxy (CFR/EP) and the lining was fabricated by pasting. The other was based on Carbon-Fiber/Epoxy (CF/EP) and the lining was fabricated by injecting. Experiments showed that in comparison with bronze nuts, the friction coefficients of CFR/EP and CF/EP nuts were reduced by 54% and 36% respectively, and the transmission efficiency increased by 50% and 29% respectively. The bearing capacities of the composite nuts were also increased. Differing from all metal-metal screws, the static frictions of the new screws were lower than the dynamic. It would have great effects on screw dynamic characteristics and need further researches.

Study on Tribological Properties of n-SiO2/FeS Solid Lubrication Composite Coating

2011 ◽  
Vol 694 ◽  
pp. 914-918
Author(s):  
Yu Qiang Zhao ◽  
Yan Zang ◽  
Yu Lin Qiao ◽  
Shan Lin Yang
Keyword(s):  
Friction Coefficient ◽  
Composite Coating ◽  
Tribological Properties ◽  
Treatment Process ◽  
Solid Lubrication ◽  
Vacuum Impregnation ◽  
Comprehensive Treatment ◽  
Low Friction ◽  
Duplex Coating ◽  
Lubrication Mechanisms

The n-SiO2/FeS solid lubrication composite coating is prepared by means of the comprehensive treatment process of gridded laser quenching, low temperature ion sulfuration and vacuum impregnation technology. The tribological properties of n-SiO2/FeS solid lubrication composite coating are investigated under the condition of dry sliding, and the lubrication mechanisms are also preliminary discussed. The experiment results reveal that the friction coefficient of the coating is in the range of 0.065~0.10 when tested in 4067 minutes. Furthermore, its wear rate is only 6% of FeS solid lubrication duplex coating. This is testified that the n-SiO2/FeS solid lubrication composite coating is durable with low friction coefficient and wear resistance.

A Study on the Tribological Properties of DLC Films Deposited with Different Reaction Gases

2005 ◽  
Vol 903 ◽  
Author(s):  
Yong Ki Cho ◽  
Gang San Kim ◽  
Kyoung Il Moon ◽  
Sang Gweon Kim ◽  
Sung Wan Kim
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Hydrogen Content ◽  
Automobile Industry ◽  
High Strength ◽  
Optical Microscope ◽  
Low Friction ◽  
Pulsed Dc ◽  
Graphite Structure ◽  
Steel Substrates

AbstractDiamond like carbon (DLC) coatings have attracted great attention for use in various applications in automobile industry and machinery because they have excellent properties such as low friction coefficient and ultra high strength. The low friction coefficient of DLC comes from anti-adhesion with other materials, smooth surface, lubrication of graphite structure at the contacting point of films, and the hydrogen content of the films. Many researches have been focused on the microstructure effects on the tribological properties of DLC films but few have been reported on the effect of hydrogen content. In this study, the effect of hydrogen content on the friction coefficient of DLC films has been investigated.DLC films have been deposited on D2 steel by plasma enhanced CVD (Pulsed DC PECVD) method with different precursor gas of C2H2and CH4and different gas pressure. The effects of gas composition on the hydrogen content in DLC films and the resulting tribological properties have been reviewed. Si interlayer was deposited on D2 to improve adhesion of DLC on steel substrates. The characteristics of microstructure were evaluated by Raman spectroscope and composition was measured by RBS and EDS. The tribological behaviors of DLC films were investigated using ball on disk tribometer. The hardness of films was examined by nano-indenter. The failure mechanism of DLC deposited on steel substrates was examined using optical microscope and SEM/EDS. The results showed that the friction coefficient of DLC films deposited with C2H2was 0.06 and that of the film with CH4was 0.15. The friction coefficient improved with decreasing hydrogen content in DLC films.

Tribological Properties Between a-C:H Coatings and SiO2 at High Temperature

2020 ◽  
Author(s):  
Noritsugu Umehara ◽  
Kota Konishi ◽  
Motoyuki Murashima ◽  
Takayuki Tokoroyama
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Wear Track ◽  
Severe Damage ◽  
Friction Test ◽  
Low Friction ◽  
Disk Friction

Abstract Tribological properties of a-C:H coatings has been investigated in various friction conditions. It is clear that temperature and mating materials give effects on tribological properties. In this study, we especially focus on the effect of mating material on its tribological properties of a-C:H coatings. Ball-on-disk friction test is conducted between a-C:H coating and 5 kinds of mating material, which is SiC, SiC(O)_800 (SiC oxidized at 800°C), SiC(O)_1050°C, SiC(O)_1300°C, and Quartz glass. It is found that a-C:H coatings shows low friction coefficient and low specific wear rate when O/Si ratio of the element content of mating material is 2, in other words, mating material is SiO2. In the wear scar of a-C:H coating after friction test with SiC, severe damage was confirmed. It is considered that a-C:H coating and SiO2 show low adhesion even at high temperature, which leads low friction and wear. Compared SiC(O) with Quartz, the friction coefficients with a-C:H coatings are respectively 0.013 and 0.038. Even though SiC(O) and Quartz are both SiO2, the tribological properties are different. On the wear track of SiC(O), transferred things from a-C:H coating are confirmed.

Tribological Properties of Nano-Sized Molybdenum Disulfide Particles

2005 ◽  
Author(s):  
Xianguo Hu ◽  
Yucheng Wu ◽  
Guangcheng Yuan ◽  
Peng Huang ◽  
Hefeng Jing
Keyword(s):  
Friction Coefficient ◽  
Metal Surface ◽  
Tribological Properties ◽  
Surface Composition ◽  
Load Capacity ◽  
Nano Particles ◽  
Lubricating Oil ◽  
Protective Film ◽  
Extreme Pressure ◽  
Sem Images

This paper summarizes the tribological properties of MoS2 nano-particles with about 30 nm under different frictional conditions. By four-ball tribometer, the results showed that as the nano-MoS2 content is over 0.5 wt% the extreme pressure of lubricating oil is higher than to 30% than that of lubricating oil with same content of common MoS2. The nano-MoS2 particles can decrease the friction coefficient of lubricating oil obviously. However the results showed that their friction reductions have not obvious difference by the ring-on-block tribometer. The analyses of surface composition conducted by XPS and SEM images showed that the nanoparticles form a protective film (WO3) allowing an increase in the load capacity of rubbed pairs. The main advantage of the nanoparticles is ascribed to the release and furnishing of the nanoparticles from the valley onto the rubbing metal surface and their confinement at the interface.

Carbon based coatings for applications in friction couples with bearing steel and aluminium alloy

2017 ◽  
Vol 1 (87) ◽  
pp. 12-20
Author(s):  
M. Makówka ◽  
B. Wendler
Keyword(s):  
Tribological Properties ◽  
Steel Substrate ◽  
Bearing Steel ◽  
Friction Couple ◽  
Low Friction ◽  
Alsi Alloy ◽  
Pin On Disc ◽  
New Type ◽  
Steel Substrates ◽  
Carbon Based

Purpose: Low friction nc-WC/a-C:H coatings deposited by means of magnetron sputtering provide very good tribological properties in friction couple against hard steels and good adhesion to steel substrates. Nevertheless, it was necessary to elaborate a new type of coatings because the nc-WC/a-C:H one had no use in friction couple against aluminium alloys. Design/methodology/approach: In the paper the WC/a-C:H and (Si, Cr)C/a-C:H coatings were investigated. The coatings were investigated by means of SEM, EDS, in order to obtain thickness, surface morphology and chemical composition of coatings. Tribological properties of deposited coatings were elaborated by means of 'pin-on-disc' method in friction couple against 100Cr6 bearing steel and AlSi alloy. Findings: It was stated that (Si, Cr)C/a-C:H coatings have very good tribological properties in friction couple against bearing steel and AlSi alloy (friction coefficient <0,1). In case of WC/a-C:H coatings, good tribological properties were achieved in friction couple with bearing steel. Both coatings have very low wear rate in investigated friction couples. Research limitations/implications: The (Si,Cr)C/a-C:H coating have a worse quality of adhesion to quenched and tempered Vanadis 23 HS steel substrate in comparison with the nc-WC/a-C:H coating. Resolving this disadvantage can increase potential of application of (Si, Cr)C/a-C:H coatings. Practical implications: Newly developed (Si, Cr)C/a-C:H coating has a greater application potential for modification of surfaces of elements working in friction couples against hardened steels and light alloys like AlSi. Originality/value: There are numerous publications where low friction carbon based coatings were described mostly as a coatings deposited on elements working in friction couples against hard steels. Undertaken tests showed that the newly developed (Si,Cr)C/a- C:H coating can have a broad spectrum of applications in friction couples against different counterbodies, including light Al alloys.

Development of Linkage-Cam Reducers and Series Design

2010 ◽  
Vol 20-23 ◽  
pp. 309-312
Author(s):  
Hong Ling Hou ◽  
Yong Qiang Zhao ◽  
Guo Hai Zhang ◽  
Bao Ming Wang
Keyword(s):  
Structural Design ◽  
3D Model ◽  
High Efficiency ◽  
Load Capacity ◽  
High Load ◽  
Operating Principle ◽  
Design Model ◽  
Series Design ◽  
New Type ◽  
High Load Capacity

It is introduced the new linkage-cam combination mechanism that has been designed and analyzed performance in the paper. Based on it and gear one teeth theory, the new type linkage-cam reducer has been successfully developed and have done structural design, model trial and industry testing ,the result is shown that the linkage-cam reducer have big drive ratio, enough high load capacity, high efficiency and so on, which provide a new type reducer for domestic reducer. Based on the operating principle and structure of linkage-cam reducers, series parameters are worked out and finally determined 9 types and 10 drive ratios. The specify type linkage-cam reducers are created 3D model，which makes series design slight simply, moreover providing fundamental basis for their application and popularization.

Low friction coefficient nanocomposite CrAlSiN/gradient-CrAlSiCN coatings for high speed/dry machining applications

2021 ◽  
pp. 1-24
Author(s):  
Puneet Chandran ◽  
Krishna Valleti ◽  
Venu Gopal Anne
Keyword(s):  
Friction Coefficient ◽  
Adhesion Strength ◽  
Tool Life ◽  
Tribological Properties ◽  
High Speed ◽  
Nanocomposite Coating ◽  
Dry Machining ◽  
Wear Properties ◽  
Low Friction ◽  
Dlc Coating

Abstract Providing advanced coating solutions for high speed dry machining applications is gaining importance by the day especially with the increasing employment of difficult-to-machine materials in niche areas. Taking into account the recent demands in developing such coatings, in the present study, a novel low friction coefficient nanocomposite coating: CrAlSiN/G-CrAlSiCN (G: Gradient) was developed which can be used in high speed or dry machining applications. Initially, CrAlSiN nanocomposite coating and carbon incorporated CrAlSiN coating were deposited separately using the cylindrical cathodic arc PVD technique. The as deposited films were comprehensively analyzed to determine their adhesion strength, phase composition, sliding wear properties (friction coefficient), hardness and tool life. Preliminary observations revealed that the films did not show evidence of diamond-like carbon (DLC) formation (from Raman analysis). Further, an increase in the carbon content led to a steep decrease in the adhesion strength. This result persuaded a study on developing a novel coating with gradient carbon architecture which would retain the properties of a nanocomposite whilst supporting the nanocomposite under-layer by reducing the coefficient of friction. In comparison to the CrAlSiN nanocomposite coating and a standard DLC coating, the novel gradient carbon coating showed superior tribological properties along with a better tool life. This study marks the first such attempt at studying the influence of carbon incorporation to the CrAlSiN nanocomposite coating on improving the overall mechanical and tribological properties of the coating architecture (CrAlSiN/G-CrAlSiCN) for dry machining applications.

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