Research on Tribological Properties and Viscoelasticity of EPDM Rubber in the Main Drive Sealing System of Shield Machine

2021 ◽  
pp. 1-9
Author(s):  
Qi Sun ◽  
Shijie Wang ◽  
Xiaoren Lv
Keyword(s):  
Carbon Black ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Adhesive Wear ◽  
Carbon Black Content ◽  
Stick Slip ◽  
Wear Process ◽  
New Compounds ◽  
Shield Machine ◽  
The Relationship

Abstract The tribological properties and wear mechanisms of EPDM with different carbon black contents under dry friction conditions are studied on an UMT Tribolab friction and wear tester. The variation of carbon black content in EPDM does not lead to the formation of new compounds. However, it significantly improves the shore hardness and tribological properties of EPDM. In addition, significant stick-slip phenomenon occurs during the wear process of EPDM with different carbon black content. During the wear process of EPDM, there are both adhesive wear and abrasive wear, and adhesive wear is the main wear form. Therefore, the results reveal the relationship between carbon black content and tribological properties of EPDM, which can contribute to improve the tribological properties of EPDM.

Effects of Concentration of Alkaline Treated SF on the Tribological Properties of POM Composites Filled with LDPE and Sisal Fibers

2011 ◽  
Vol 415-417 ◽  
pp. 94-99
Author(s):  
Ding Han Xiang ◽  
Wen Juan Li ◽  
Jiao Ling Ma
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Impact Test ◽  
Adhesive Wear ◽  
Wear Test ◽  
Alkaline Treatment ◽  
Mechanical And Tribological Properties ◽  
Naoh Solution ◽  
Sisal Fibers ◽  
Test Impact

Polyoxymethylene (POM) composites filled with low-density polyethylene (LDPE) and sisal fibers (SF) were prepared by extrusion and injection molding. Sisal fibers were treated by various concentrations of NaOH solution to improve the poor compatibility between SF and matrix. Fourier transform infrared spectroscopy (FTIR) analysis and scanning electron microscope (SEM) test were used to confirm the surface treatment. The effects of SF alkaline treatment on the mechanical and tribological properties of POM composites were determined by using tensile test, impact test and friction and wear test. The worn surfaces of composites were investigated by SEM. Results showed that the composite filled with 12.5% NaOH treated SF exhibited the optimal mechanical and tribological properties among the all composites. The major wear mechanism of the composites was adhesive wear and abrasive grain wear.

Effects of Weaves on the Tribological Properties of Hybrid Kevlar/PTFE Fabric Composites

2010 ◽  
Vol 139-141 ◽  
pp. 125-128 ◽  
Author(s):  
Yu Lin Yang ◽  
Da Peng Gu ◽  
Wei Deng
Keyword(s):  
Tensile Strength ◽  
Tribological Properties ◽  
Laser Scanning ◽  
Confocal Laser Scanning Microscope ◽  
Friction Reduction ◽  
Confocal Laser ◽  
Wear Process ◽  
Fabric Composites ◽  
Fabric Surface ◽  
The Relationship

Three weaves (plain, twill 1/3 and satin 8/3) of hybrid kevlar/PTFE fabric composites were selected for investigating the influence of weaves on the tribological properties. Pin-on-flat linear reciprocating wear studies were done on the three kinds of composites on a CETR Tester under pressure 20 MPa and frequency 13 Hz. The relationship between the tensile strength and the tribolog- ical performance of fabric composites was also examined. It was observed that though the friction coefficient of satin 8/3 was the lowest, the specific wear rate was also the highest. Plain weave, however, performed worse in friction-reduction while resulting best in antiwear performance. The tensile strength does not have an influence on the wear performance. So the different tribological performance of the three weaves of fabric composites may attribute to the different PTFE proportion in the fabric surface and adhesive wear. A model of wear process of fabric composites was proposed and supported by the Confocal Laser Scanning Microscope (CLSM) studies.

scholarly journals Effect of Two-Stage Cooling on the Microstructure and Tribological Properties of Steel–Copper Bimetals

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 492
Author(s):  
Yuanyuan Kang ◽  
Guowei Zhang ◽  
Zhaojie Wang ◽  
Hong Xu ◽  
An Wan
Keyword(s):  
Friction And Wear ◽  
Copper Layer ◽  
Air Cooling ◽  
Two Stage ◽  
Solidification Temperature ◽  
Wear Process ◽  
Lubricating Film ◽  
Forced Air ◽  
Solid Liquid ◽  
The Relationship

In this paper, the solid–liquid composite method is used to prepare the steel–copper bimetal sample through two-stage cooling process (forced air cooling and oil cooling). The relationship between the different microstructures and friction properties of the bimetal copper layer is clarified. The results show that: the friction and wear parameters are 250 N, the speed is 1500 r/min (3.86 m/s), the friction coefficient fluctuates in the range of 0.06–0.1, and the lowest point is 0.06 at 700 °C. The microstructure of the copper layer was α-Cu, δ, Cu3P, and Pb phases, and Pb was free between α-Cu dendrites. When the solidification temperature is 900 °C, the secondary dendrite of α-Cu develops. With the decrease temperature, the growth of primary and secondary dendrites gradually tends to balance at 700 °C. During the wear process, Pb forms a self-lubricating film uniformly distributed on the surface of α-Cu, and the Cu3P and δ phases are distributed in the wear mark to increase α-Cu wear resistance.

Friction and wear performance of a copper-based bond emery wheel for rail grinding

2020 ◽  
Vol 62 (12) ◽  
pp. 1205-1214
Author(s):  
Lu-cheng Cai ◽  
Xiao-song Jiang ◽  
Yu-cheng Guo ◽  
Da-ming Sun ◽  
Xing-long Wang ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Adhesive Wear ◽  
Grinding Wheel ◽  
Wear Performance ◽  
Wear Process ◽  
Delamination Wear ◽  
Grinding Performance ◽  
Rail Grinding ◽  
Hot Pressing Sintering ◽  
Oxidation Wear

Abstract In this paper, a copper-based bond emery wheel was prepared by vacuum hot pressing sintering through powder metallurgy. The effects of various bond contents on the grinding performance of the copperbased bond grinding wheel were studied using a self-made experimental device; the friction coefficients between the friction pairs and roughness of the grinded rail surface were also obtained. The results show that the grinding wheel had the best grinding performance when the content of the copper-based bond was at 35 wt.-%, the friction coefficient 0.29, the grinding ratio 81.34, and the surface roughness 7.191 μm, which meet the roughness requirements of rail grinding. The microstructure of the rail surface and debris after grinding were studied by scanning electron microscope and energy spectrum analysis. Adhesive wear, abrasive wear, oxidation wear and delamination wear occurred during the friction and wear process. The grinding behavior of grinding wheels was analyzed in accordance with the experimental results.

Tribological Properties of Spherical Plain Bearings with Self-Lubricating PTFE Woven Liners

2011 ◽  
Vol 338 ◽  
pp. 607-610 ◽  
Author(s):  
Ming Qiu ◽  
Zhi Lun Gao ◽  
Guo Feng Wang ◽  
Long Chen
Keyword(s):  
Abrasive Wear ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Adhesive Wear ◽  
Dry Sliding ◽  
Heavy Load ◽  
Wear Characteristics ◽  
Fabric Composite ◽  
Composite Liners ◽  
Friction And Wear Characteristics

The friction and wear behaviors of three kinds of spherical plain bearings with PTFE fabric composite liners were investigated by a high oscillating frequency and heavy load tribo-tester. Dry sliding tests were carried out at different oscillating frequencies. With the help of SEM and EDS, the differences of worn surfaces of the three spherical bearings were investigated. The results indicate that the fiber woven with PTFE effects the friction and wear characteristics of bearing, the tribological properties of bearing with Kevlar/PTFE fiber woven liner is the best in the three kinds of bearing. The abrasive wear are appeared on the surface of wore liners of bearingⅠ,while bearingⅡappeared normal wear, bearing III showed serious adhesive wear and abrasive wear.

scholarly journals Correlation between Defects and Technical Wear of Materials Used in Traditional Construction

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2482
Author(s):  
Jarosław Konior ◽  
Mariusz Rejment
Keyword(s):  
Residential Buildings ◽  
Descriptive Analysis ◽  
Technical Condition ◽  
Water Penetration ◽  
Major Drawback ◽  
Wear Process ◽  
Materials Used ◽  
Traditional Construction ◽  
The Relationship ◽  
Measurable Property

The degree of technical wear of old buildings, which are made of basic materials (cement, concrete, steel, timber, plaster, brick) using traditional technology, is expressed by the size and intensity of damage to their elements. The topic of the research concerns old residential buildings from the turn of the 19th and 20th centuries, which are located in the downtown district of Wroclaw, Poland. The descriptive analysis and the analysis of the definitions of defects that occur in the elements of residential buildings, which were performed as random analyzes, do not allow defects to be considered as measurable variables at a level of visual investigation. The major drawback of the method that is used by experts when assessing the technical condition of civil engineering buildings is that it does not numerically express the magnitude (strength) of the defects. Therefore, an attempt was made to numerically express the relationship (if such a relationship exists) between the occurred defects of buildings and the extent of their technical wear process. When calculating the strength of this relationship, the method of determining the point biserial correlation coefficient for the measurable property and the dichotomous property was used. It was found that the direction of the relation is right-hand for all the tested building elements, but the strength of the correlation between the detected defects and technical wear shows a considerable span and depends on the conditions of the apartment house’s maintenance. As a rule, damage caused by water penetration and moisture penetration always shows correlations of at least moderate strength.

Investigation of Electromagnetic Interference Shielding Effectiveness of Cement-Based Composites Filled with Carbon Materials

2010 ◽  
Vol 168-170 ◽  
pp. 1021-1024
Author(s):  
Guo Xuan Xiong ◽  
Zhi Bin Zhang ◽  
Min Deng ◽  
Yu Fen Zhou
Keyword(s):  
Carbon Fiber ◽  
Carbon Black ◽  
Electromagnetic Interference ◽  
Carbon Materials ◽  
Shielding Effectiveness ◽  
Nano Carbon ◽  
Electromagnetic Interference Shielding Effectiveness ◽  
Carbon Nano Tube ◽  
Relationship Of ◽  
The Relationship

The cement-based composite shielding materials filled with carbon materials such as ordinary carbon materials (graphite, coke and carbon black), carbon fiber and nano-carbon materials (carbon nano-tube and nano-carbon black) were prepared. The relationship of conductivity and shielding effectiveness in a frequency range of 100 KHz~1.5 GHz was studied. The electric properties of cement-based composites filled with carbon fiber is better than other carbon materials. With the contents of carbon fiber of 5.vol%, the average shielding effectiveness is about 37 dB and the maximum shielding effectiveness reaches 40 dB.

Friction and Wear Behaviors of Solid Lubricants/Polyimide Composites in Liquid Mediums

2010 ◽  
Vol 654-656 ◽  
pp. 2763-2766 ◽  
Author(s):  
Li Wen Mu ◽  
Xin Feng ◽  
Yi Jun Shi ◽  
Huai Yuan Wang ◽  
Xiao Hua Lu
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Alkaline Solution ◽  
Dry Friction ◽  
Friction And Wear ◽  
Solid Lubricants ◽  
Polyimide Composites ◽  
Inorganic Fillers ◽  
Ptfe Composites

The tribological properties of polyimide (PI) composites reinforced with graphite or MoS2 sliding in liquid alkali and water as well as dry friction were investigated using a ring-on-ring tester. The results show that the friction coefficient (μ) and wear rate (W) for both graphite/PI and MoS2/PI composites in different liquid mediums are μdry>μwater >μalkali and Wwater>Wdry >Walkali. Results also indicate that the friction coefficient and wear rate of the PI composites filled with different solid lubricants are μMoS2 >μgraphite and W MoS2 >Wgraphite in different liquid mediums. In addition, the hydrophobic inorganic fillers are fit for the reinforcement of polymer-based composites sliding in liquid mediums. It is also concluded from the authors’ work that the wear rate and friction coefficient of polymer-based (such as PI, PTFE) composites in the alkali lubricated conditions is lowest among all the friction conditions. This may be attributed to the ionic hydration in the alkaline solution.

Self-Lubricating and Wear Resistant Epoxy Composites Incorporated With Microencapsulated Wax

2014 ◽  
Vol 81 (7) ◽  
Author(s):  
N. W. Khun ◽  
H. Zhang ◽  
C. Y. Yue ◽  
J. L. Yang
Keyword(s):  
Tribological Properties ◽  
Friction And Wear ◽  
Normal Load ◽  
Wear Test ◽  
Epoxy Composites ◽  
Wear Resistant ◽  
Working Parameters

Self-lubricating and wear resistant epoxy composites were developed via incorporation of wax-containing microcapsules. The effects of microcapsule size and content and working parameters on the tribological properties of epoxy composites were systematically investigated. The incorporation of microcapsules dramatically decreased the friction and wear of the composites from those of the epoxy. The increased microcapsule content or the incorporation of larger microcapsules decreased the friction and wear of the epoxy composites due to the larger amount of released wax lubricant via the rupture of microcapsules during the wear test. The friction of the composites decreased with increased normal load as a result of the promoted wear of the composites and the increased release of the wax lubricant.

Amorphous Carbon Coatings for Locally Adjusted Tribological Properties in Sheet Bulk Metal Forming

2012 ◽  
Vol 504-506 ◽  
pp. 969-974 ◽  
Author(s):  
Harald Hetzner ◽  
Stephan Tremmel ◽  
Sandro Wartzack
Keyword(s):  
Amorphous Carbon ◽  
Tribological Properties ◽  
Metal Forming ◽  
Friction And Wear ◽  
Wear Properties ◽  
Carbon Coatings ◽  
Bulk Metal ◽  
Bulk Metal Forming ◽  
Friction And Wear Properties ◽  
Amorphous Carbon Coatings

In sheet bulk metal forming, locally adapted friction properties of the contact tool/workpiece are an appropriate means for the targeted enhancement of the material flow, enabling an improved form filling and lowered forming forces. However, the implementation of desirable friction conditions is not trivial. And further, friction is inseparably linked to wear and damage of the contacting surfaces. This calls for a methodological approach in order to consider tribology as a whole already in the early phases of process layout, so that tribological measures which allow fulfilling the requirements concerning local friction and wear properties of the tool surfaces, can already be selected during the conceptual design of the forming tools. Thin tribological coatings are an effective way of improving the friction and wear properties of functional surfaces. Metal-modified amorphous carbon coatings, which are still rather new to the field of metal forming, allow tackling friction and wear simultaneously. Unlike many other types of amorphous carbon, they have the mechanical toughness to be used in sheet bulk metal forming, and at the same time their friction properties can be varied over wide ranges by proper choice of the deposition parameters. Based on concrete research results, the mechanical, structural and special tribological properties of tungsten-modified hydrogenated amorphous carbon coatings (a-C:H:W) are presented and discussed against the background of the tribological requirements of a typical sheet bulk metal forming process.

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