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Comparison of effect of SiC and MoS2 on wear behavior of Al matrix composites

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Transactions of Nonferrous Metals Society of China 2019年第6期29卷 1169-1183页

作者： Mohammad ROUHI Mohammad MOAZAMI-GOUDARZI Mohammad ARDESTANI Department of Materials Engineering Science and Research Branch Islamic Azad University

In order to improve dry sliding wear resistance of pure aluminum against steel, aluminum-based composites reinforced with different contents of SiC,MoS2 and SiC/MoS2 particles were synthesized by press and sintering of the corresponding powder mixtures. The microstructural evaluations showed a dense microstructure which were in good agreement with the result of density and hardness measurements. The results of pin on disk wear tests performed against an AISI 52100 steel pin at a constant load and sliding velocity showed that there was a critical content for both types of the reinforcements at which the lowest wear rate was obtained, i.e. 10 vol.% and 2 vol.%, respectively,for Al/SiC and Al/MoS2 composites. However,the lowest wear rate and friction of coefficient were attained for Al/10 SiC/2 MoS2 hybrid composite. According to the scanning electron microscope observations, the predominant wear mechanism was changed from adhesion to abrasion mostly whenMoS2 particles were incorporated in the pure aluminum. Mild delamination was identified as the main wear mechanism for Al/SiC and Al/SiC/MoS2 composites. The frictional traces and worn surfaces of Al/SiC/MoS2 composites approached to those of Al/SiC composites,indicating the dominant role of SiC particles in tribological behavior of the hybrid composites.

关键词： Al/SiC/MoS2 composites microstructure wear mechanism friction

wear behavior of high strength and high conductivity Cu alloys under dry sliding

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Transactions of Nonferrous Metals Society of China 2015年第7期25卷 2293-2300页

作者：高原接金川张鹏超张剑王同敏李廷举大连理工大学材料科学与工程学院大连116024 北京赛尔克瑞特电工有限公司北京100070

In order to study the wear behavior of different kinds of contact wires,the dry sliding wear behaviors of Cu-Sn,Cu-Ag and Cu-Mg alloys prepared by up-drawn continuous casting and followed continuous extrusion were *** research was tested on a block-on-ring wear *** results indicate that the friction coefficient is remarkably influenced by the formation of a continuous tribofilm,which consists of oxidation *** abrasion,adhesion,oxidation and plastic deformation are *** and abrasion wear mechanisms dominate at the lower sliding velocity and *** combination of oxidation and adhesion play leading roles with the increasing load and *** deformation is detected under higher applied load and sliding velocities.

关键词： copper alloys contact wire sliding wear mass loss wear mechanism electron microstructure

Effects of environment on dry sliding wear behavior of silver-copper based composites containing tungsten disulfide

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Transactions of Nonferrous Metals Society of China 2017年第10期27卷 2202-2213页

作者： Ji-si WU Jing-fu LI Lei ZHANG Zhi-yuan QIAN State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China Shanghai Key Laboratory of Spacecraft mechanism Shanghai 201109 China

Silver based composites containing different amounts of WS2were prepared by hot-pressing method and their tribologicalbehaviors were investigated against coin silver under humid air,dry nitrogen and vacuum on a ball-on-disk tester with normal load *** components of composites,microstructure of debris and worn surface were characterized using XRD SEM,EDS and *** is demonstrated that environmental conditions significantly affect the tribological behavior of silver based *** frictioncoefficient is the highest in humid air,and the lowest in dry *** is found that the friction and wear behavior of the compositesare strongly depended on the characteristics of the lubrication film forming in different operating environments,such as thicknessand *** addition,it is indicated that the dominant wear mechanisms of silver based composites are abrasive wear anddelamination under different conditions.

关键词： self-lubricating composites tribological behaviors atmosphere wear mechanism

Fracture and Tribological Evaluation of Dental Composite Resins Containing Pre-polymerized Particle Fillers

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Journal of Materials Science & Technology 2003年第3期19卷 249-252页

作者： JingriREN KyohanKim SeockSamKim DepartmentofMechanicalEngineering YanbianUniversityYanji133002China DepartmentofDentalBiomaterials KyungpookNationalUniversityTaegu701-702Korea DepartmentofMechanicalEngineering KyungpookNationalUniversityTaegu701-702Korea

The fracture and tribological evaluation of dental composite resin containing pre-polymerized particle fillers were investigated. Composite resins, e.g. metafil, silux plus, heliomolar and palfique estelite were selected as specimens in order to evaluate the effects of pre-polymerized particle filler on the fracture and wear characteristics of composite resins. In the wear tests, a ball-on-flat wear test method was used. The friction coefficient of metafil was quite high. The wear resistance of silux plus and palfique estelite was better than that of metafil and heliomolar under the same experimental condition. The main wear mechanism of composite resins containing pre-polymerized particle fillers was an abrasive wear by brittle fracture of pre-polymerized particles and by debonding of fillers and matrix.

关键词： Composite resin Tribology Dental materials Pre-polymerization wear mechanism

Effects of cerium and phosphorus on microstructures and properties of hypereutectic Al-21%Si alloy

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Journal of Rare Earths 2013年第5期31卷 522-525页

作者：王爱琴张利军谢敬佩 The School of Mater. Sci. & Eng. Henan University of Science and Technology

The influences of P and rare earth （RE） complex modifier on the microstructure and mechanical properties of hypereutectic Al-21%Si alloy were studied. The ingots were made by metal mold casting and the proportion of Ce＋P ingredient was different. The result showed that the size of grains could be refined obviously by the Ce＋P modifier and the effect of phosphorus was more intensive The primary silicon crystal was refined, while the needle-like eutectic silicon was turned fibrous or short. The alloy mechanical prop- erties had the best performance when 0.08% P and 0.6% Ce were added. The modification of primary silicon grains mainly depended on the heterogeneous nucleation mechanism, and the metamorphic mechanism of eutectic silicon was explained by adsorbing-twirming theory. The strengthening mechanism of experimental alloy was also discussed. The σb, 20 ℃ increases from 236.2 to 287.6 MPa and σb, 300 ℃ increases from 142.5 to 210 MPa.

关键词： Al-21Si alloy (Ce+P) modification complexes microstructure wear mechanism rare earths

Comparative tribological behavior of friction composites containing natural graphite and expanded graphite

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Friction 2020年第4期8卷 684-694页

作者： Hongyun JIN Keke ZHOU Zhengjia JI Xiaocong TIAN Ying CHEN Luhua LU Yazhou REN Chunhui XU Shanshan DUAN Jiangyu LI Shu-en HOU Faculty of Materials Science and Chemistry China University of GeosciencesWuhan 430074China Department of Mechanical Engineering University of WashingtonSeattleWA 98195-2600USA

In this study, expanded graphite and natural graphite were introduced into resin-based friction materials, and the tribological behavior of the composites was investigated. The tribo-performance of the two friction composites was evaluated using a constant speed friction tester. The results showed that the expanded graphite composite (EGC) displayed better lubricity in both the fading and the recovery processes. The wear rate of the EGC decreased by 22.43%more than that of the natural graphite composite (NGC). In the fading process, and the EGC enhanced the stability of the coefficient of friction. The recovery maintenance rate of the NGC was 4.66% higher than that of the EGC. It can be concluded that expanded graphite plays an important role in the formation of a stable contact plateau and can effectively reduce the wear.

关键词： natural graphite expanded graphite tribological behavior wear mechanism

A review on conventional and nonconventional machining of SiC particle-reinforced aluminium matrix composites

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Advances in Manufacturing 2020年第3期8卷 279-315页

作者： Ji-Peng Chen Lin Gu Guo-Jian He School of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing 210037People’s Republic of China Department of Mechanical Engineering Polytechnic University of MilanPiazza Leonardo da Vinci 32Milan 20133Italy State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Among the various types of metal matrix composites,SiC particle-reinforced aluminum matrix composites(SiCp/Al)are finding increasing applications in many industrial fields such as aerospace,automotive,and ***,SiCp/Al composites are considered as difficult-to-cut materials due to the hard ceramic reinforcement,which causes severe machinability degradation by increasing cutting tool wear,cutting force,*** improve the machinability of SiCp/Al composites,many techniques including conventional and nonconventional machining processes have been *** purpose of this study is to evaluate the machining performance of SiCp/Al composites using conventional machining,i.e.,turning,milling,drilling,and grinding,and using nonconventional machining,namely electrical discharge machining(EDM),powder mixed EDM,wire EDM,electrochemical machining,and newly developed high-efficiency machining technologies,e.g.,blasting erosion arc *** research not only presents an overview of the machining aspects of SiCp/Al composites using various processing technologies but also establishes optimization parameters as reference of industry applications.

关键词： SiCp/Al Machining Conventional wear mechanism Nonconventional Performance

Dry sliding friction and wear behaviors of Mg_2B_2O_5 whisker reinforced 6061Al matrix composites

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Transactions of Nonferrous Metals Society of China 2014年第1期24卷 49-57页

作者：金培鹏陈庚韩丽王金辉青海大学机械工程学院西宁810016

The friction and wear properties of Mg2B2O5 whisker reinforced 6061Al matrix composite fabricated via power ultrasonic-stir casting process were investigated using a ball-on-disk wear-testing machine against a GCr45 steel counterface under dry sliding conditions. The reinforcements include as-received Mg2B2O5 whiskers and Mg2B2O5 whiskers coated with CuO and ZnO. The volume fraction of the composites is 2%. The relationship between the wear rate and the coefficient of friction was discussed. The results indicate that the wear rate of the Mg2B2O5 whiskers coated with ZnO reinforced aluminum matrix composites is the lowest among the materials. As the applied load and sliding speed steadily increase the coefficients of friction and wear rates of the as-received matrix alloy and the fabricated composites decrease. As the applied load and sliding speed increase, the wear mechanisms of the composites shift from a mild to a severe regime.

关键词： metal-matrix composite sliding wear wear testing wear mechanism

Conductive grease synthesized using nanometer ATO as an additive

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Friction 2015年第1期3卷 56-64页

作者： Xiangyu GE Yanqiu XIA Zongying SHU Xiaopei ZHAO School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing 102206China

A new conductive grease was synthesized using a nanometer powder,i.e.,Sb doped SnO2(ATO),as an *** typical properties of this new conductive grease were investigated in *** results indicate that ATO can dramatically improve the dropping point and reduce contact *** tribological properties of the new conductive grease were investigated using the MFT-R4000 reciprocating friction and wear *** tribol-test results indicate that ATO can dramatically improve the tribological properties of the *** the ATO concentration is 0.1wt%,the grease demonstrates the best friction reduction properties;when the concentration is 0.5wt%,the grease demonstrates the best anti-wear *** worn surfaces were observed and analyzed by scanning electron microscopy and energy-dispersive X-ray spectroscopy,and the friction mechanisms for the new conductive grease are *** excellent tribological properties of the new conductive grease are attributed to the mechanical effect of ATO,and the film formed by Sn and Sb elements or metallic oxide deposited on worn surfaces during the friction process.

关键词： Sb doped SnO2(ATO) conductive grease contact resistance friction and wear wear mechanism