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Synergistic regulation of current-carrying wear performance of resin matrix carbon brush composites with tungsten copper composite powder 被引量:1
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作者 TU Chuan-jun GONG Pei +4 位作者 REN Gai-mei CHEN Gang CHEN Jian HONG Li-rui LIU Ping 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第10期2973-2987,共15页
Resin matrix carbon brush composites(RMCBCs)are critical materials for high-powered electric tools.However,effectively improving their wear resistance and heat dissipation remains a challenge.RMCBCs prepared with flak... Resin matrix carbon brush composites(RMCBCs)are critical materials for high-powered electric tools.However,effectively improving their wear resistance and heat dissipation remains a challenge.RMCBCs prepared with flake graphite powders that were evenly loaded with tungsten copper composite powder(RMCBCs-W@Cu)exhibited a low wear rate of 1.63 mm^(3)/h,exhibiting 48.6%reduction in the wear rate relative to RCMBCs without additives(RMCBCs-0).In addition,RMCBCs-W@Cu achieved a low friction coefficient of 0.243 and low electric spark grade.These findings indicate that tungsten copper composite powders provide particle reinforcement and generate a gradation effect for the epoxy resin(i.e.,connecting phase)in RMCBCs,which weakens the wear of RMCBCs caused by fatigue under a cyclic current-carrying wear. 展开更多
关键词 resin matrix carbon brush composite tungsten copper composite powder current-carrying wear particle reinforcement
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Damping of Ni–Mn–Ga epoxy resin composites 被引量:1
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作者 Wei Liang He Yu +1 位作者 Liu Yufeng Yang Naibin 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2013年第6期1596-1605,共10页
By combining the advantages of effcient damping and high mechanical properties,Ni-Mn-Ga particle composites have a very good prospect for applications in damping structure design.In this paper,a ferromagnetic shape me... By combining the advantages of effcient damping and high mechanical properties,Ni-Mn-Ga particle composites have a very good prospect for applications in damping structure design.In this paper,a ferromagnetic shape memory alloy Ni-Mn-Ga composite is prepared.Ni-Mn-Ga particle/bisphenol-A epoxy composite cantilever beam vibration tests under a magnetic feld and without the magnetic feld are conducted to analyze the structural damping ratios n.Meanwhile,the damping characteristics of the Ni-Mn-Ga composite are studied through the axial loading-unloading method and the acoustic emission signals method.The damping coeffcient of the composite for different Ni-Mn-Ga volume fractions is obtained.The interface properties of the composite are discussed by micro examination and axial loading.The relationships between the damping of the composite and that of the component materials are discussed.The specifc damping capacity(SDC)and acoustic emission counts diagram of different specimens with different Ni-Mn-Ga volume fractions are analyzed. 展开更多
关键词 Acoustic emission Ferromagnetic material Material damping Ni-Mn-Ga resin matrix composite Structural damping ratio
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