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abrasive wear Mechanisms of Sand Particles Intruding into ATM Roller-scraper Tribosystem

Chinese Journal of Mechanical Engineering 2011年第5期24卷 905-910页

作者： WU Tonghai DIAO Dongfeng FANG Liang Theory of Lubrication and Bearing Institute Xi＇an Jiaotong University Xi＇an 710049 China Post-doctoral Research Center of Material Science and Engineering Xi＇an Jiaotong University Xi＇an 710049 China

The roller-scraper tribosystem of automatic teller machine（ATM） plays an important role in reliable cash ***,the abrasive wear of the polymer tribosystem becomes a prominent problem when operating in sandy *** wear behavior of the tribosystem in a simulated sandy environment has been experimentally studied *** the abrasive wear mechanism of roller-scraper tribosystems is still unknown to new *** wear rates of polymer rollers were examined comprehensively and several jumping variations were found in the full data *** wear stages were classified by the magnitude of wear rates,and different dominant wear mechanisms corresponding with different particle diameter were found by examining the worn *** a presumption was proposed that wear mechanisms in different stages were correlated with sand particles of different *** a verification experiment,three typical wear mechanisms including cutting,ploughing,and wedging were found corresponding with different wear stages by scanning electron microscope（SEM） examination.A theoretical analysis was carried out with a simplified sphere particle intrusion model and the transfer conditions for different wear mechanisms were studied referring to the slip-field *** a main result,three typical wear models versus friction coefficient of particle/roller,and particle radius were mapped with variant hardness of the polymer roller and ratio of contact shear stress to bulk shear *** result illuminated the abrasive wear mechanism during particle ***,the critical transition conditions gave the basis for improving the wear performance of roller-scraper tribosystems in a sandy environment.

关键词： tribosystem abrasive wear mechanism

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abrasive wear characteristics and mechanisms of Al_2O_3/PA1010 composite coatings

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Rare Metals 2004年第1期23卷 59-63页

作者： JIAXian LINGXiaomei DepartmentofScienceandTechnology University.ofScienceandTechnologyBeijing.Beijing100083.China DepartmentofAnalyticalChemistry SchoolofPharmaceuticalScience.PekingUniversity.Beijing100083China

The abrasive wear characteristics of Al_2O_3/PA1010 composite coatings on thesurface of quenched and low-temperature temper steel 45 were tested on the template abrasive weartesting machine and the same uncoated steel 45 was used as a reference material. Experimentalresults showed that the abrasive wear resistance of Al_2O_3/PA1010 composite coatings has a goodlinear relationship with the volume fraction of Al_2O_3 particles in Al_2O_3/PA1010 compositecoatings, and the linear correlative coefficient is 0.979. Under the experimental conditions, thesize of Al_2O_3 particles (40.5-161.0 μm) has little influence on the abrasive wear resistance ofAl_2O_3/PA1010 composite coatings. By treating the surface of Al_2O_3 particles with a suitablebonding agent, the distribution of Al_2O_3 particles in matrix PA1010 is more homogeneous and thebonding state between Al_2O_3 particles and matrix PA1010 is better. Therefore, the Al_2O_3particles in Al_2O_3/PA1010 composite coatings make the Al_2O_3/PA1010 composite coatings havebetter abrasive wear resistance than PA1010 coatings. The wear resistance of Al_2O_3/PA1010composite coatings is about 45% compared with that of steel 45.

关键词： composite material coating abrasive wear Al_2O_3 nylon

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abrasive wear Resistance of Dual Phase Steels DP980 and DP600

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Journal of Iron and Steel Research International 2015年第4期22卷 317-323页

作者： Xiu-lin JI Ju-yi WANG Cui-cui JI Jian-hua ZHAO Engineering Research Center of Dredging Technology of Ministry of Education Hohai University College of Mechanical and Electrical Engineering Hohai University

The abrasive wear resistance of dual phase （DP） steels DP980 and DP600 was investigated by using an ASTM rubber wheel abrasion tester. At 2.40 m ·s-1 sliding speed under 19.9 N load with 180--355μm abrasive sands, the wear rates of DP980 and DP600 were 1.01 × 10^-11 and 0.86 ×10^-11 m3 · m-1 , respectively, correspond- ing to about 1.9 and 2.3 times of the relative wear resistance of normal low-carbon steel ASTM A283C. Using di- rectly water quenching from austenitic temperature, the abrasive wear resistance of DP980 samples under 19.9 N load could be improved by 1.65 times. The wear rates of DP980 and DP600 samples decreased respectively with in- creasing sliding speed and abrasive particle size and decreasing applied load. The experimental results reveal that the effect of martensite on the wear resistance not only depends on the volume fraction but also depends on the morphol- ogy, distribution and grain size.

关键词： abrasive wear annealing wear mechanism DP980 steel

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abrasive wear Behavior and Mechanism of High Chromium Cast Iron

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Journal of Iron and Steel Research International 2015年第1期22卷 84-90页

作者： Ting SUN Ren-bo SONG Xu WANG Peng DENG Chun-jing WU School of Materials Science and Engineering University of Science and Technology Beijing

The abrasive wear behavior of high chromium cast iron （containing 12.9 mass% chromium） austenitized at 1 050 ℃ for 2 h and austempered in salt bath at 320 ℃ for 4 h was evaluated. abrasive wear was performed using alumina abrasive under four different loads, namely 50, 100, 150, and 200 N, for 36000 cycles. The worn surfaces and wear debris were analyzed by scanning electron microscopy, laser confocal microscopy and X-ray diffraction. Micro hard- ness profiles were also obtained in order to analyze the strain-hardening effects beneath the contact surfaces. Results indicate that the retained austenite in high chromium cast iron has experienced induced martensitic transformation af- ter tests, for small amounts of retained austenite could be detected by X-ray diffraction. In addition, there is a close relationship between wear mechanism and test load. Under the condition of lower test load, the wear mechanism is an uninterrupted and repeated process, during which matrix is cut at first and then fine carbides flake off. As to high- er test load, scratching and spalling induced by cleavage fracture of blocky carbide are the wear mechanism.

关键词： high chromium cast iron abrasive wear wear mechanism wear behavior martensitic transformation

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abrasive wear Behavior of High Chromium Cast Iron and Hadfield Steel-A Comparison

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Journal of Iron and Steel Research International 2012年第4期19卷 43-50页

作者： Mehdi Mazar Atabaki Sajjad Jafari Hassan Abdollah-pour Department of Materials Engineering Faculty of Mechanical EngineeringUniversiti Teknologi MalaysiaJohor Bahru 81310Malaysia Institute for Materials Research School of ProcessEnvironmental and Materials EngineeringFaculty of EngineeringUniversity of LeedsLeeds LS29JTUK Department of Materials Engineering Faculty of EngineeringSemnan UniversitySemnan 85138-33931Iran

wear properties of two different crushers used for grinding raw materials of cement industry are compared using pin-on-disk wear *** wear test was carried out with different loads on a *** wear behavior of two alloys was evaluated by comparing mass loss,wear resistance,microhardness and friction *** microstructure of the specimens was detected using optical *** results showed that abrasive wear of high chromium cast iron is lower than that of Hadfield *** to the presence of M7C3 carbides on the high chromium cast iron matrix,impact crushers exhibited higher friction coefficient

关键词： abrasive wear Hadfield steel high chromium cast iron

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abrasive wear Map of Polymer Tapes in Sand Dust Environment

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Journal of China University of Mining and Technology 2006年第2期16卷 128-131页

作者： WU Tong-hai DIAO Dong-feng Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Xi＇ an Jiaotong University Xi＇an shaanxi 710049 China

To make clear the wear conditions of ATM (Automatic Teller Machine) tribosystem when servicing in Chi- nese sand dust environment, abrasive wear of two kinds of polymer tapes specified for ATM, PI (Polyimide) and PEN (Polyethylene-2, 6-naphthalenedicarboxylate), was investigated in simulated sand dust environment with ATM tape-scraper tribosystem under various conditions of loads and sliding distances. The surface profiles of worn tape were measured with a surface profiler in order to calculating the wear cross-section areas and the wear volumes. The specific wear rates of polymer tapes were calculated under load conditions of 0.6, 1 and 1.5 N, and wear mechanisms were in- vestigated with optical topography photos. As main results, the specific wear rates show stage variations in the wear process and the wear resistance of polymer tape shows good relationship with the mechanical deformation factors. In consideration of the service life, four wear models are generalized according to the magnitude of specific wear rates, which include no wear, mild wear, normal wear and severe wear model and the corresponding wear mechanisms for the four wear models are discussed with typical worn topographies. Based on the wear models and corresponding wear mechanisms, the abrasive wear maps of two polymer tapes servicing in sand dust environments are concluded for its industrial applications.

关键词： abrasive wear polymer wear map sand dust environment

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Effect of Cr Content on the Compression Properties and abrasive wear Behavior of the High-Volume Fraction(TiC–TiB_2)/Cu Composites

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Acta Metallurgica Sinica(English Letters) 2014年第5期27卷 951-956页

作者： Feng Qiu Yue Han Ai Cheng Jianbang Lu Qichuan Jiang Key Laboratory of Automobile Materials Ministry of EducationDepartment of Materials Science and EngineeringJilin University

The （TiC-TiB2）/Cu composites with 50 vol% TiC-TiB2 ceramic particles were successfully fabricated by the combustion synthesis and hot press consolidation in a Cu-Ti-B4C-Cr system. The effects of the Cr content on the microstructures, hardness, compression properties, and abrasive wear behaviors of the composites were investigated. The final products consist of only Cu, TiC, and TiB2 phases, and the ceramic particles are distributed uniformly in these composites. The size of the ceramic particles decreases with Cr addition. As the Cr content increases, the yield strength, ultimate compression strength, microhardness, and abrasive wear resistance of the composites increase, and the fracture strain decreases.

关键词： Metal matrix composites Powder metallurgy Combustion synthesis abrasive wear

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Tribological mechanisms of slurry abrasive wear

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Friction 2023年第6期11卷 1079-1093页

作者： Yulong LI Paul SCHREIBER Johannes SCHNEIDER Christian GREINER Institute for Applied Material(IAM) Karlsruhe Institute of Technology(KIT)Karlsruhe76131Germany KIT IAM-ZM MicroTribology Center(μTC) Karlsruhe76131Germany

abrasive wear mechanisms—including two-body and three-body abrasion—dominate the performance and lifespan of tribological systems in many engineering fields,even of those operating in lubricated *** steel(100Cr6)pins and discs in a flat-on-flat contact were utilized in experiments together with 5 and 13 μm Al_(2)O_(3)-based slurries as interfacial media to shed light on the acting *** results indicate that a speed-induced hydrodynamic effect occurred and significantly altered the systems'frictional behavior in tests that were performed using the 5 μm *** experiments revealed that a speed-dependent hydrodynamic effect can lead to a 14% increase in film thickness and a decrease in friction of around 2/3,accompanied by a transition from two-body abrasion to three-body abrasion and a change in wear mechanism from microcutting and microploughing to fatigue ***,no correlation could be found between the total amount of wear and the operating state of the system during the experiment;however,the wear distribution over pin and disc was observed to change *** paper studies the influence of the hydrodynamic effect on the tribological mechanism of lubricated abrasive wear and also highlights the importance to not only consider a tribological systems'global amount of wear.

关键词： abrasive wear two-body abrasion three-body abrasion hydrodynamic effect steel

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Coupling behavior between adhesive and abrasive wear mechanism of aero-hydraulic spool valves

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Chinese Journal of Aeronautics 2016年第4期29卷 1119-1131页

作者： Chen Yunxia Gong Wenjun Kang Rui School of Reliability and Systems Engineering Beihang University

Leakage due to wear is one of the main failure modes of aero-hydraulic spool valves. This paper established a practical coupling wear model for aero-hydraulic spool valves based on dynamic system modelling theory. Firstly, the experiment for wear mechanism verification proved that adhesive wear and abrasive wear did coexist during the working process of spool valves. Secondly coupling behavior of each wear mechanism was characterized by analyzing actual time-variation of model parameters during wear evolution process. Meanwhile, Archard model and three-body abrasive wear model were utilized for adhesive wear and abrasive wear, respectively. Furthermore, their coupling wear model was established by calculating the actual wear volume. Finally, from the result of formal test, all the required parameters for our model were obtained. The relative error between model prediction and data of pre-test was also presented to verify the accuracy of model, which demonstrated that our model was useful for providing accurate prediction of spool valve's wear life. (C) 2016 The Authors. Production and hosting by Elsevier Ltd. on behalf of Chinese Society of Aeronautics and Astronautics.

关键词： abrasive wear Adhesive wear Aero-hydraulic spool valves Coupling effects Dynamic model

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Two-Body abrasive wear of the Surfaces of Pangolin Scales

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Journal of Bionic Engineering 2007年第2期4卷 77-84页

作者： Jin Tong Tie-biao Lu Yun-hai Ma Heng-kun Wang Lu-quan Ren R. D. Arnell The Key Laboratory of Terrain-Machine Bionics Engineering （Ministry of Education China） Jilin University Changchun 130025 P. R. China Jost Institute of Tribotechnology University of Central Lancashire Preston PR1 2HE UK

The Pangolin, a soil-burrowing animal, is covered with scales. These scales are often abraded by soil and rock and their surface is corrugated. The abrasive wear of the surface of the scales was examined. The scales were taken from a pangolin that had died of natural causes. The tests were run on a rotary disc abrasive wear tester. The abrasive material was quartz sand （96.5 wt.%） and bentonite （3.5 wt.%）. The morphology of the abraded surfaces and the abrasion were examined by stereoscopic microscopy and scanning electron microscopy. The concepts are proposed of ＂Guiding-Effect＂ and ＂Rolling-Effect＂ on the textured surfaces under free abrasive wear conditions and the critical dimensions of the ＂Rolling-Effect＂ are discussed.

关键词： pangolin scale surface morphology abrasive wear

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