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Influence of alloy components on arc erosion morphology of Ag/MeO electrical contact materials 被引量:8
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作者 吴春萍 易丹青 +2 位作者 翁桅 李素华 周孑民 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第1期185-195,共11页
Arc erosion morphologies of Ag/MeO(10) electrical contact materials after 50000 operations under direct current of 19 V and 20 A and resistive load conditions were investigated using scanning electron microscope(SE... Arc erosion morphologies of Ag/MeO(10) electrical contact materials after 50000 operations under direct current of 19 V and 20 A and resistive load conditions were investigated using scanning electron microscope(SEM) and a 3D optical profiler(3DOP). The results indicated that 3DOP could supply clearer and more detailed arc erosion morphology information. Arc erosion resistance of Ag/SnO_2(10) electrical contact material was the best and that of Ag/CuO(10) was the worst. Arc erosion morphology of Ag/MeO(10) electrical contact materials mainly included three different types. Arc erosion morphologies of Ag/ZnO(10) and Ag/SnO_2(10) electrical contact materials were mainly liquid splash and evaporation, and those of Ag/CuO(10) and Ag/CdO(10) were mainly material transfer from anode to cathode. Arc erosion morphology of Ag/SnO_2(6)In_2O_3(4) electrical contact materials included both liquid splash, evaporation and material transfer. In addition, the formation process and mechanism on arc erosion morphology of Ag/MeO(10) electrical contact materials were discussed. 展开更多
关键词 Ag/MeO electrical contact material alloy component arc erosion morphology three-dimensional optical profiler
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Effect of sintering temperature on the physical properties and electrical contact properties of doped AgSnO_2 contact materials 被引量:7
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作者 Hai-tao Wang Zi-xiang Wang +2 位作者 Lian-zheng Wang Jing-qin Wang Yan-cai Zhu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第11期1275-1285,共11页
AgSnO_ 2 electrical contact materials doped with Bi_2O_3,La_2O_3,and TiO_2 were successfully fabricated by the powder metallurgy method under different initial sintering temperatures.The electrical conductivity,densit... AgSnO_ 2 electrical contact materials doped with Bi_2O_3,La_2O_3,and TiO_2 were successfully fabricated by the powder metallurgy method under different initial sintering temperatures.The electrical conductivity,density,hardness,and contact resistance of the Ag Sn O_2/Bi_2O_3,AgSnO_2/La_2O_3,and AgSnO_2/Ti O_2 contact materials were measured and analyzed.The arc-eroded surface morphologies of the doped AgSnO_2 contact materials were investigated by scanning electron microscopy(SEM).The effects of the initial sintering temperature on the physical properties and electrical contact properties of the doped AgSnO_2 contact materials were discussed.The results indicate that the physical properties can be improved and the contact resistance of the AgSnO_2 contact materials can be substantially reduced when the materials are sintered under their optimal initial sintering temperatures. 展开更多
关键词 SINTERING TEMPERATURE contact materials PHYSICAL PROPERTIES electrical contact PROPERTIES
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Effects of silver powder particle size on the microstructure and properties of Ag-Yb_2O_3 electrical contact materials prepared by spark plasma sintering 被引量:6
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作者 CHEN Xiaohua,JIA Chengchang,and LIU Xiangbing School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China 《Rare Metals》 SCIE EI CAS CSCD 2010年第4期366-370,共5页
mg-Yb203 electrical contact materials were fabricated by spark plasma sintefing (SPS). The effects of silver powder particle size on the microstructure and properties of the samples were investigated. The surface mo... mg-Yb203 electrical contact materials were fabricated by spark plasma sintefing (SPS). The effects of silver powder particle size on the microstructure and properties of the samples were investigated. The surface morphologies of the sintered samples were examined by optical microscope (OM), and the fracture morphologies were observed by scanning electron microscopy (SEM). The physical and mechanical properties such as density, electrical resistivity, microhardness, and tensile strength were also tested. The results show that the silver powder particle size has evident effects on the sintered materials. Comparing with coarse silver powder (5 ktm), homogeneous and fme microstmcture was obtained by fine silver powder (_〈0.5-1am). At the same time, the electrical conductivity, microhardness, and tensile strength of the sin- tered samples with fine silver powder were higher than those of the samples with coarse silver powder. However, silver powder particle size has little influence on the relative densities, which of all samples (both by free and coarse silver powders) is more than 95%. The fracture characteristics are ductile. 展开更多
关键词 COMPOSITES electrical contact materials spark plasma sintering particle size microstructure physical properties mechanical properties
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Testing results analysis of contact materials’electrical contact performance 被引量:7
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作者 WANG Jing-qin WANG Hai-tao WEN Ming ZHU Yan-cai 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2007年第3期459-463,共5页
Because of the different ways in which contact materials work, the basic requirements for silver metal oxide contact materials are different. They are anti-welded and anti-erosion when closed, anti-erosion when broken... Because of the different ways in which contact materials work, the basic requirements for silver metal oxide contact materials are different. They are anti-welded and anti-erosion when closed, anti-erosion when broken, and arc easily moved and have smaller contact resistance. In this paper, La2O3 is used as a stable oxide in contact material to replace CdO. A new type of Ag/SnO2-La2O3-Bi2O3 contact material is first obtained through using powder metallurgical method. Then electrical contact material parameter tester is used to test the electrical contact performance of the contact material. Through experiments, the arcing voltage and current curves, arcing energy curves, fusion power curves while broken and contact resistance while closed were obtained. Analysis of the results showed that the addition of La2O3 makes the contact material have the following advantages: smaller electrical wear, smaller arc energy, smaller contact resistance and arc is more easily extinguished. 展开更多
关键词 Ag/SnO2-La2O3-Bi2O3 contact materials electrical contact performance
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Influence of operation number on arc erosion behavior of Ag/Ni electrical contact materials 被引量:3
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作者 Run-zhang HUANG Guo-fu XU +2 位作者 Qiong WU Meng YUAN Chun-ping WU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第8期2681-2695,共15页
Arc erosion behavior of Ag/Ni materials with different operation numbers was investigated by OM,3DOP and SEM.The results indicated that the arc erosion of Ag/10Ni electrical contact material fabricated by sintering−ex... Arc erosion behavior of Ag/Ni materials with different operation numbers was investigated by OM,3DOP and SEM.The results indicated that the arc erosion of Ag/10Ni electrical contact material fabricated by sintering−extrusion technology was more and more serious with the operation numbers increasing from 1000 to 40000.With the same operation numbers,the arc erosion on anode was more serious than that on cathode.Besides,the pores preferred to emerge around the arc effect spot during the first 10000 operations.And the morphology of the molten silver on cathode and anode was different due to the action of gravity and arc erosion.Furthermore,the relationships among arc energy,arc time,welding force,electric resistivity,temperature and mass change on contacts were discussed,which indicated that the mass loss on cathode was mainly caused by the fracture of molten bridge. 展开更多
关键词 Ag/Ni electrical contact material operation number arc erosion arc parameter
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Influence of graphite content on sliding wear characteristics of CNTs-Ag-G electrical contact materials 被引量:19
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作者 王娟 凤仪 +1 位作者 李庶 林森 《中国有色金属学会会刊:英文版》 EI CSCD 2009年第1期113-118,共6页
CNTs-Ag-G electrical contact composite material was prepared by means of powder metallurgical method. The influence of the graphite content on sliding wear characteristics of electrical contact levels was examined. In... CNTs-Ag-G electrical contact composite material was prepared by means of powder metallurgical method. The influence of the graphite content on sliding wear characteristics of electrical contact levels was examined. In experiments, CNTs content was retained as 1% (mass fraction), and graphite was added at content levels of 8%, 10%, 13%, 15% and 18%, respectively. The results indicate that with the increase of graphite content, the contact resistance of electrical contacts is enhanced to a certain level then remains constant. Friction coefficient decreases gradually with the increase of graphite content. Wear mass loss decreases to the minimum value then increases. With the small content of graphite, the adhesive wear is hindered, which leads to the decrease of wear mass loss, while excessive graphite brings much more worn debris, resulting in the increase of mass loss. It is concluded that wear mass loss reaches the minimum value when the graphite mass fraction is about 13%. Compared with conventional Ag-G contact material, the wear mass loss of CNTs-Ag-G composite is much less due to the obvious increase of hardness and electrical conductivity, decline of friction surface temperature and inhibition of adhesive wear between composites and slip rings. 展开更多
关键词 CNTs-Ag-G复合材料 金属材料 镀层 摩擦系数
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Research on arc erosion of silver-based alloy contact materials under low voltage,resistive load and small current at 400 Hz and 50 Hz 被引量:1
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作者 Jing Li1,2,Zhi-ying Ma11. School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049 2. School of Electrical Information,Hunan Institute of Engineering,Xiangtan 411101,China. 《Journal of Pharmaceutical Analysis》 SCIE CAS 2009年第3期149-154,共6页
By using a self-developed IF power and a ASTM contact material experimental system of small-capacity and variable frequency,the value of arcing characteristics and the welding force of the silver-based contact materia... By using a self-developed IF power and a ASTM contact material experimental system of small-capacity and variable frequency,the value of arcing characteristics and the welding force of the silver-based contact material are acquired under low voltage,resistive load and small current at 400 Hz and 50 Hz. By means of an electricity-ray analytical balance,SEM and EDAX,the weighing values of the contact materials and the changes of AgCdO,AgNi,AgC and AgW contact material surface profile and micro-area constituent are obtained and analyzed. The arc erosion causes of silver-based alloy contact materials at 400 Hz and 50 Hz are also discussed. 展开更多
关键词 silver-based alloy low voltage 400 Hz 50 Hz contact material arc erosion
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Preparation and microstructure characterization of a nano-sized Ti^(4+)-doped AgSnO_2 electrical contact material 被引量:24
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作者 ZHENG Ji LI Songlin DOU Fuqi LI Tonghui 《Rare Metals》 SCIE EI CAS CSCD 2009年第1期19-23,共5页
A Ti^4+-doped nano-structured AgSnO2 material was prepared using sol-gel method and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The ... A Ti^4+-doped nano-structured AgSnO2 material was prepared using sol-gel method and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The results show that Ti^4+ cations are successfully doped into the crystal lattice of SnO2, and thus significantly improve the electrical conductivity of the sample. Furthermore, the coating of Ag on Ti^4+-doped SnO2 nano-sized particles enhances the surface wettability and enables the resulting AgSnO2 material to have better mechanical properties. 展开更多
关键词 electrical contact material sol-gel process DOPING chemical coating silver
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Oxidized film on C_p/Cu-Cd electrical contact material 被引量:1
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作者 邵文柱 甄良 +2 位作者 李义春 崔玉胜 周劲松 《中国有色金属学会会刊:英文版》 CSCD 2005年第S2期251-255,共5页
Constituents of the oxidized surface film on diamond particles reinforced Cu-Cd alloy matrix composite (Cp/Cu-Cd) were investigated by XPS. The results show that Cu2O is the main constituent when the oxidized film i... Constituents of the oxidized surface film on diamond particles reinforced Cu-Cd alloy matrix composite (Cp/Cu-Cd) were investigated by XPS. The results show that Cu2O is the main constituent when the oxidized film is thin; CuO appears only after the film is rather thick. The originally formed oxidized film on the Cp/Cu-Cd is about 10nm in thickness and is mainly composed of Cu2O and Cu. After oxidized at 120℃ over 30h, CuO is detected in the film. 展开更多
关键词 Cu-based COMPOSITES electrical contact materials XPS OXIDATION
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Realization of a novel Ag/SnO_2 electrical contact material with microscopic fiber-like structure
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作者 Chen Lawson Liu Weili Tian Hui 《Engineering Sciences》 EI 2013年第3期66-71,75,共7页
According to the principle that fiber-like arrangement of reinforcing particles SnO2 paralleling to the direction of current is propitious to the electrical and mechanical performance of the electrical contact materia... According to the principle that fiber-like arrangement of reinforcing particles SnO2 paralleling to the direction of current is propitious to the electrical and mechanical performance of the electrical contact materials, we proposed and reported a novel precursor route used to prepare Ag/SnO,. electrical contact material with fiber- like arrangement of reinforcing nanoparticles. The mechanism for the formation of fiber-like arrangement of rein- forcing nanoparticles in Ag/SnO2 electrical contact material was also discussed. The as-prepared samples were char- acterized by means of scanning electron microscope (SEM), optical microscope (OM), energy-dispersive X-ray spectroscopy (EDX), MHV2000 microhardness test, and double bridge tester. The analysis showed that the as-prepared Ag/SnO,, electrical contact material with fiber-like arrangement of reinforcing nanoparticles exhibits a high elongation of 24 %, a particularly low electrical resistivity of 2.08 μΩ. cm, and low arcing energy, and thus has considerable technical, economical and environmental benefits. 展开更多
关键词 fiber-like NANOPARTICLES electrical contact material PRECURSOR AG/SNO2
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Arc erosion behaviors of AgSnO_2 contact materials prepared with different SnO_2 particle sizes 被引量:10
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作者 张苗 王献辉 +2 位作者 杨晓红 邹军涛 梁淑华 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第3期783-790,共8页
To clarify the effect of SnO2 particle size on the arc erosion behavior of AgSnO2 contact material, Ag?4%SnO2 (mass fraction) contact materials with different sizes of SnO2 particles were fabricated by powder metallur... To clarify the effect of SnO2 particle size on the arc erosion behavior of AgSnO2 contact material, Ag?4%SnO2 (mass fraction) contact materials with different sizes of SnO2 particles were fabricated by powder metallurgy. The microstructure of Ag?4%SnO2 contact materials was characterized, and the relative density, hardness and electrical conductivity were measured. The arc erosion of Ag?4%SnO2 contact materials was tested, the arc duration and mass loss before and after arc erosion were determined, the surface morphologies and compositions of Ag?4%SnO2 contact materials after arc erosion were characterized, and the arc erosion mechanism of AgSnO2 contact materials was discussed. The results show that fine SnO2 particle is beneficial for the improvement of the relative density and hardness, but decreases the electrical conductivity. With the decrease of SnO2 particle size, Ag?4%SnO2contact material presents shorter arc duration, less mass loss, larger erosion area and shallower arc erosion pits. 展开更多
关键词 AgSnO_2 contact materials SnO_2 particle size arc erosion electrical conductivity HARDNESS
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Arc erosion of AgSnO_2 electrical contacts at different stages of a break operation 被引量:41
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作者 J. Swingler A. Sumption 《Rare Metals》 SCIE EI CAS CSCD 2010年第3期248-254,共7页
Arc erosion studies are conducted on AgSnO2 contact materials at different stages in the break operation. A resistive load arrangement is used with up to 42 V DC at 24 A and a constant contact opening velocity. The ar... Arc erosion studies are conducted on AgSnO2 contact materials at different stages in the break operation. A resistive load arrangement is used with up to 42 V DC at 24 A and a constant contact opening velocity. The arc current is terminated at different stages as the arc is drawn between the contacts enabling a study of the arcing phenomena up to that point. Surface profiling of the contacts is conducted to determine the extent of erosion at the different stages as the arc is drawn. Spectral analysis is also conducted on the arc and then related to the extent of erosion. The results show that particular features occur at different stages as the arc is drawn. As the arc is initially established, it goes through an "Arc Generation" regime where the arc roots are small and immobile on both the anode and the cathode. Material transfer occurs mainly from anode to cathode. The spectral analysis indicates that Sn and O species dominate the arc followed by the Ag species. As the arc is drawn further and enters the "Arc Degeneration" regime, the anode undergoes significantly larger erosion than the cathode. Also, both contacts indicate that multiple arc roots have formed, which are highly mobile in the later stages of the discharge. The spectral analysis indicates that Ag and N species are in high concentrations compared to other species. The mechanisms of erosion and deposition are discussed in relation to the species within the arc discharge. For the complete break operation, it is found that the anode undergoes major erosion, and it is thought that the gaseous ions species do not dominate the arc under these conditions of short arcs and voltage 〈42 V to cause cathode erosion. 展开更多
关键词 contact materials electrical contacts arc erosion 3D surface profiles spectral analysis
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Failure characteristics of Ag-SnO_2 contact material in AC level 被引量:2
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作者 MENG Fanbin LU Jianguo +3 位作者 ZHU Yongqing LU Ningyi CHEN Zhichao HUANG Qiutao 《Rare Metals》 SCIE EI CAS CSCD 2008年第1期18-21,共4页
The failure characteristics of the contact material Ag-SnO2 were investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM),and X-ray energy dispersive spectroscopy(EDS).Phase analysis showed that ... The failure characteristics of the contact material Ag-SnO2 were investigated by X-ray diffraction(XRD),scanning electron microscopy(SEM),and X-ray energy dispersive spectroscopy(EDS).Phase analysis showed that there were Ag,SnO2,and Sn on the contact surfaces at the time of failure under the load condition of 30 A and 220 V(AC),which means that SnO2 decomposed in service.When the contacts were tested under airproof ambient condition,half-spherical bulges came into being on the contact surfaces,which resulted in early failure and dispersive characteristics.But half-spherical bulges were not found when the contacts were tested under open ambient condition.The temperature change of the contacts during the life testing under airproof ambient condition was different from that under open ambient condition. 展开更多
关键词 contact materials electric contact failure analysis RELAYS
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Effects of Rare Earths on Electrical Conductivity, Melting-Welding and Corrosion Resistance by Electric Arc of Copper-Based Alloys 被引量:1
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作者 钱宝光 耿浩然 +1 位作者 郭忠全 王艳 《Journal of Rare Earths》 SCIE EI CAS CSCD 2005年第S1期378-382,共5页
The effects of rare earths on electric conductivity fusion welding-resistance and erosion-resistance by electric arc of copper-based compound material by adding different amount of rare earths to copper base to get co... The effects of rare earths on electric conductivity fusion welding-resistance and erosion-resistance by electric arc of copper-based compound material by adding different amount of rare earths to copper base to get copper based compound materials were studied. Rare earths improve active ability among interfaces and optimize organizational structures. The conductivity of samples with rare earths is obviously better than that of materials without them. Moreover, wear ability and oxidization resistance of materials with rare earths can be improved greatly. For copper contact head with rare earths, electric arc corrosion resistance and welding-melting resistance are improved. Such alloys also decrease resistance change with increasing temperature. But the adding quantity of rare earths should be appropriate and formed handicraft should be properly regulated. 展开更多
关键词 electrical contact materials electrical conductivity melting-welding resistance corrosion resistance rare earths
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High-speed imaging observation on molten bridges of AgNi10 electrical contact material
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作者 Jing-Hong Chen Song Chen +2 位作者 Ming Xie Jie-Qiong Hu Sai-Bei Wang 《Rare Metals》 SCIE EI CAS CSCD 2023年第1期336-345,共10页
The electrical contact-high-speed imaging experimental system was developed to investigate the molten bridge phenomena of AgNi10 electrical contact material.The dimension of molten bridges was measured along with the ... The electrical contact-high-speed imaging experimental system was developed to investigate the molten bridge phenomena of AgNi10 electrical contact material.The dimension of molten bridges was measured along with the measurement of waveforms in the contact voltage under the load of direct current(DC) 6 V(8-20 A)and breaking speed of 50.0 mm·s^(-1).A part of the observed results was presented as well as surface morphology of the contacts after electrical contact behavior,which shows some interesting and new phenomena.Molten bridges and arc could exist simultaneously.The stable molten bridge looks like cylindrical shape and then becomes needle tip at its rupture,the diameter and length of molten bridges both increase with the increase in current and the growth gradient of the diameter is larger than that of the length.The morphology and elemental distribution of the contact surface are changed by the behavior of electrical contact. 展开更多
关键词 Molten bridge High-speed imaging ARC AgNi10 electrical contact material
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石墨烯柔性压阻传感器微织构压缩应变机制 被引量:1
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作者 许静 马靖轩 +3 位作者 王路文 连加俤 蔡林烜 董林玺 《中国表面工程》 EI CAS CSCD 北大核心 2024年第1期169-178,共10页
为满足智能机器人、电子皮肤等领域对柔性传感器高灵敏度日益增加的需求,通过设计高表面积形貌以制备石墨烯凸台微织构柔性传感器,并对比分析有无微织构传感器的灵敏度;基于结构力学方程与静电方程,建立微织构柔性传感器模型,开展了电... 为满足智能机器人、电子皮肤等领域对柔性传感器高灵敏度日益增加的需求,通过设计高表面积形貌以制备石墨烯凸台微织构柔性传感器,并对比分析有无微织构传感器的灵敏度;基于结构力学方程与静电方程,建立微织构柔性传感器模型,开展了电场作用不同基底厚度以及微织构间距下柔性传感器微织构应变的数值模拟,研究柔性压阻传感器微织构压缩应变机制,探寻机械载荷和电载荷的交互作用关系。结果表明,柔性基底的微织构化处理能有效提高柔性压阻传感器的灵敏度。模型总位移的最大值随基底厚度的增加呈非线性增加,微织构应变随着厚度的增加而减小。电场作用下微织构应变受机电耦合压力叠加的影响均大于无电场作用。框状微织构类似于悬臂梁,作用在微织构上的力矩随间距增加而增大,同时刚度减小,微织构的压缩形变增加,应变增大。组合尺寸微织构的应变随着微织构间距的增加而增大,制备多尺寸微结构传感器可使用(150+350)μm的组合尺寸,能够有效增加接触面积提高传感器灵敏度。机械载荷和电载荷的耦合作用,组合尺寸对力矩与刚度的分配有效增加了基底的应变,提高了柔性传感器的灵敏度。 展开更多
关键词 柔性传感器 数值模拟 电场 超弹性材料 接触模型
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Cu含量对Ag/LSCO电接触材料物理性能的影响 被引量:1
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作者 王大帅 曹旭丹 +1 位作者 杨芳儿 郑晓华 《贵金属》 CAS 北大核心 2024年第1期15-22,共8页
采用溶胶凝胶法辅以高能球磨工艺合成Cu粉体改性La_(0.5)Sr_(0.5)CoO_(3-δ)(LSCO)粉体,用粉末冶金工艺结合热挤压技术制备了系列Cu改性Ag/LSCO电接触材料与成品丝,研究了Cu粉体对改性Ag/LSCO材料界面润湿性、物理力学性能等影响规律。... 采用溶胶凝胶法辅以高能球磨工艺合成Cu粉体改性La_(0.5)Sr_(0.5)CoO_(3-δ)(LSCO)粉体,用粉末冶金工艺结合热挤压技术制备了系列Cu改性Ag/LSCO电接触材料与成品丝,研究了Cu粉体对改性Ag/LSCO材料界面润湿性、物理力学性能等影响规律。结果表明,随着Cu含量的增加,改性Ag/LSCO-xCu(x=0、1、2、4、6、8)电接触材料的电阻率呈先增加后减小的趋势,与Ag和LSCO基底的润湿角变化趋势相一致,但其密度和硬度性能变化趋势相反;当Cu含量为4%时,Ag和LSCO-4Cu基底的润湿角达最小值55.0°,相应的成品丝(φ2.35mm)性能最佳:电阻率2.29μΩ·cm,硬度(HV^(0.3))946.7MPa,密度9.73g/cm^(3),断后延伸率3.9%,为纯Ag/LSCO的3.9倍。 展开更多
关键词 电接触材料 Ag/LSCO Cu改性 物理性能 润湿角
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Field-effect at electrical contacts to two-dimensional materials
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作者 Yao Guo Yan Sun +13 位作者 Alvin Tang Ching-Hua Wang Yanqing Zhao Mengmeng Bai Shuting Xu Zheqi Xu Tao Tang Sheng Wang Chenguang Qiu Kang Xu Xubiao Peng Junfeng Han Eric Pop Yang Chai 《Nano Research》 SCIE EI CSCD 2021年第12期4894-4900,共7页
The inferior electrical contact to two-dimensional(2D)materials is a critical challenge for their application in post-silicon very large-scale integrated circuits.Electrical contacts were generally related to their re... The inferior electrical contact to two-dimensional(2D)materials is a critical challenge for their application in post-silicon very large-scale integrated circuits.Electrical contacts were generally related to their resistive effect,quantified as contact resistance.With a systematic investigation,this work demonstrates a capacitive metal-insulator-semiconductor(MIS)field-effect at the electrical contacts to 2D materials:The field-effect depletes or accumulates charge carriers,redistributes the voltage potential,and gives rise to abnormal current saturation and nonlinearity.On one hand,the current saturation hinders the devices’driving ability,which can be eliminated with carefully engineered contact configurations.On the other hand,by introducing the nonlinearity to monolithic analog artificial neural network circuits,the circuits’perception ability can be significantly enhanced,as evidenced using a coronavirus disease 2019(COVID-19)critical illness prediction model.This work provides a comprehension of the field-effect at the electrical contacts to 2D materials,which is fundamental to the design,simulation,and fabrication of electronics based on 2D materials. 展开更多
关键词 FIELD-EFFECT electrical contact two-dimensional materials NONLINEARITY in-memory-computing
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AgCu系电接触材料研究进展
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作者 杨铭湘 陈永泰 +3 位作者 谢明 宁德魁 陈松 杨有才 《贵金属》 CAS 北大核心 2024年第S01期1-6,共6页
银铜系电接触材料作为银基电接触材料的一大重要门类在电接触材料行业中因其卓越的电导率、耐磨性、抗熔焊性和广泛应用而占据重要地位。本文对Ag CuNi、AgCuV、AgCuO合金系列以及Ag Cu/LSCO等银铜系电接触材料的性能特点、制备工艺和... 银铜系电接触材料作为银基电接触材料的一大重要门类在电接触材料行业中因其卓越的电导率、耐磨性、抗熔焊性和广泛应用而占据重要地位。本文对Ag CuNi、AgCuV、AgCuO合金系列以及Ag Cu/LSCO等银铜系电接触材料的性能特点、制备工艺和研究现状进行了归纳和阐述。分析了银铜系电接触材料研究中存在的问题,并展望了发展趋势。 展开更多
关键词 金属材料 银铜系电接触材料 制备工艺 材料改性
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梯度热处理制备技术加速合金最佳热处理工艺参数筛选
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作者 方继恒 谢明 +5 位作者 马洪伟 胡洁琼 刘国化 赵上强 陈永泰 张吉明 《贵金属》 CAS 北大核心 2024年第2期26-34,43,共10页
AgCuNiInSn系列电接触合金的合金化程度要求高,需要对合金铸锭进行均匀化热处理来消除铸锭组织中的低熔点非平衡相和枝晶偏析。对于热处理最佳工艺参数的摸索,传统的“试错法”存在实验量巨大、研发周期长、研发效率低等不足。本研究提... AgCuNiInSn系列电接触合金的合金化程度要求高,需要对合金铸锭进行均匀化热处理来消除铸锭组织中的低熔点非平衡相和枝晶偏析。对于热处理最佳工艺参数的摸索,传统的“试错法”存在实验量巨大、研发周期长、研发效率低等不足。本研究提出一种梯度温度场均匀化热处理高通量制备方法,用于Ag-6Cu-0.5Ni-0.5In-0.5Sn合金最佳均匀化热处理条件筛选。结果表明,经过608.13℃/1h的梯度均匀化热处理,再经过75%的塑形变形后,硬度达到最大值为168.7,合金组织晶粒和第二相体积较小,点状第二相弥散分布较多且均匀,细晶强化效应和弥散强化效应最为显著。 展开更多
关键词 电接触材料 AgCuNiInSn合金 均匀化处理 高通量筛选
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