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Preparation and Anti⁃arc Erosion Property of Ag Matrix Electrical Contact Material Reinforced by Novel Ti_(2)Cd
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作者 SUN Wanjie SHI Yuxin +4 位作者 DING Jianxiang REN Wanbin PAN Zhixiong ZHANG Peigen SUN Zhengming 《材料导报》 EI CAS CSCD 北大核心 2024年第21期190-196,共7页
Due to their outstanding electrical contact properties,Cd-containing silver-matrix electrical contact materials can meet the requirements of high stability and long life for military defense and aerospace applications... Due to their outstanding electrical contact properties,Cd-containing silver-matrix electrical contact materials can meet the requirements of high stability and long life for military defense and aerospace applications.In order to further reduce the Cd content under the premise of meeting the high-performance requirements,in this study,high-purity intermediate Ti_(2)Cd powder of MAX phase(Ti_(2)CdC)was synthesized with a pressureless technique and then applied to reinforce the Ag matrix.The Cd content of the as-prepared Ag/Ti_(2)Cd composites was actually reduced by 38.31%compared with conventional Ag/CdO material.Based on the systematic study of the effect of heat treatment temperature on the physical phase,morphology,interface and comprehensive physical properties of Ag/Ti_(2)Cd composites,the preferred samples(heat treated at 400°C for 1 h)showed high density(97.77%),low resistivity(2.34μΩ·cm),moderate hardness(90.8HV),high tensile strength(189.9 MPa),and exhibited good electrical contact performance after 40000 cycles of arc discharging under severe conditions(DC 28 V/20 A).The results of microscopic morphological evolution,phase change and elemental distribution of the electrical contact surface show that the combination of high stability of Ti_(2)Cd reinforcing phase,good interfacial bonding with Ag matrix and improved melt pool viscosity in the primary stage of arc erosion,results in low and stable contact resistance(average value 13.20 mΩ)and welding force(average value 0.6 N),low fluctuation of static force(2.2-2.5 N).The decomposition and absorption energy of Ti_(2)Cd and the arc extinguishing effect of Cd vapor are the main reasons for the stable arcing energy and arcing time of electric contacts in the late stage of arc erosion. 展开更多
关键词 low-voltage apparatus ag matrix composite Ti-Cd compound electrical contact properties arc erosion mechanism
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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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Te含量对Ag/SnO_(2)In_(2)O_(3)电接触材料组织及电接触性能的影响
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作者 尹恒虎 聂宝鑫 +3 位作者 周细应 张国全 王塞北 顾文秀 《材料热处理学报》 CAS CSCD 北大核心 2024年第1期42-52,共11页
采用合金内氧化法制备了不同Te含量的Ag/SnO_(2)In_(2)O_(3)电接触材料,利用X射线衍射(XRD)、X射线光电子能谱(XPS)和光学显微镜(OM)分析了Ag/SnO_(2)In_(2)O_(3)微观组织,利用JF04C触点测试系统测试了铆钉型触点的电接触性能,分析了Ag/... 采用合金内氧化法制备了不同Te含量的Ag/SnO_(2)In_(2)O_(3)电接触材料,利用X射线衍射(XRD)、X射线光电子能谱(XPS)和光学显微镜(OM)分析了Ag/SnO_(2)In_(2)O_(3)微观组织,利用JF04C触点测试系统测试了铆钉型触点的电接触性能,分析了Ag/SnO_(2)In_(2)O_(3)电接触材料的转移损耗情况,并利用扫描电镜(SEM)对电接触材料动静触点电弧侵蚀形貌进行了分析,分析Te的添加对材料性能和燃弧机制的影响。结果表明:Te的添加有助于细化晶粒,并且随着Te含量增加,Ag/SnO_(2)In_(2)O_(3)材料形成了波浪状组织,Te的加入未对Ag、SnO_(2)和In_(2)O_(3)的存在形式造成影响,材料的相组成包括Ag、SnO_(2)、In_(2)O_(3)、TeO_(2)和单质Te。随着Te含量增加,材料的接触电阻呈现先上升后下降再上升的趋势,当Te的添加量为0.75%时,接触电阻最低且最稳定,熔焊力平均值为26.6 cN,低于常规模拟继电器30.6 cN的分断力。Te的添加改变了材料转移模式,减少了电弧侵蚀表面喷溅状侵蚀形貌的出现,当Te的添加量为0.75%时,电弧侵蚀表面产生的“猪网油”状的网状结构和“桑葚”状结构,对Ag/SnO_(2)In_(2)O_(3)材料在持续高频直流场合抗材料定向转移及抗熔焊性能方面改善显著,过量添加则会恶化触点性能。 展开更多
关键词 ag/SnO_(2)In_(2)O_(3) 碲元素 电接触性能 电弧侵蚀 网状结构
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Ag/Cr_(2)AlC电接触材料的微观组织与耐电弧侵蚀性能
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作者 汪丹丹 朱泓羽 +3 位作者 魏坤霞 魏伟 田无边 孙正明 《材料导报》 EI CAS CSCD 北大核心 2024年第21期185-189,共5页
Ag基电接触材料被广泛应用于低压电路控制器件中,在电路中起承载、分断、闭合电流的作用。Cr_(2)AlC作为M_(n+1)AX_(n)相的典型代表之一,兼具金属和陶瓷的优良性能,有望成为Ag基电接触材料中优良的增强相。本项目采用粉末冶金法制备Ag/C... Ag基电接触材料被广泛应用于低压电路控制器件中,在电路中起承载、分断、闭合电流的作用。Cr_(2)AlC作为M_(n+1)AX_(n)相的典型代表之一,兼具金属和陶瓷的优良性能,有望成为Ag基电接触材料中优良的增强相。本项目采用粉末冶金法制备Ag/Cr_(2)AlC复合材料,表征其微观组织,探究其界面反应,并研究材料的物理性能和耐电弧侵蚀性能。结果表明,由于Al原子的弱结合,经烧结,Ag与Cr_(2)AlC发生明显的界面反应,生成Ag_(3)Al和Cr-C化合物。相比于生坯,Ag/Cr_(2)AlC熟坯的密度和硬度下降,分别为9.04 g/cm^(3)和(78.9±5.5)HV,且由于界面反应的发生,材料的电阻率为(141.9±0.4)×10^(-9)Ω·m。电弧侵蚀结果表明,Ag/Cr_(2)AlC材料经电弧侵蚀生成Al_(2)O_(3),Ag发生熔融喷溅,产生明显凸起,Ag/Cr_(2)AlC的质量损失为6.25%。 展开更多
关键词 电接触材料 MAX相 ag/Cr_(2)AlC 界面反应 耐电弧侵蚀
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Ag-MAX电触头材料的研究现状及发展趋势
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作者 彭韬 谭志龙 +3 位作者 张晓波 王兴宇 罗仙慧 巫小飞 《贵金属》 CAS 北大核心 2024年第1期70-77,共8页
电触头材料是继电器、电路开关、仪器仪表等电气设备中极为重要的组成部分,承担接通、断开电路及负载电流的任务,电触头材料的性能、质量好坏将直接影响仪器的寿命及使用可靠性。对近年来逐渐得到关注的Ag-MAX电触头材料进行简要介绍,... 电触头材料是继电器、电路开关、仪器仪表等电气设备中极为重要的组成部分,承担接通、断开电路及负载电流的任务,电触头材料的性能、质量好坏将直接影响仪器的寿命及使用可靠性。对近年来逐渐得到关注的Ag-MAX电触头材料进行简要介绍,讨论了Ag-MAX电触头材料的种类、制备工艺及相关性能,对Ag-MAX电触头材料的未来发展进行展望。 展开更多
关键词 电触头材料 ag-MAX 制备工艺 发展趋势
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NiO添加剂对高致密Ag-SnO_(2)材料力学和电接触性能的影响
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作者 范玉卓 梁滢雪 +2 位作者 陈良玉 彭一洋 李桂景 《贵金属》 CAS 北大核心 2024年第3期59-66,共8页
为提高Ag-SnO_(2)电接触材料的综合性能,采用真空热复压技术实现了高效致密化,研究了纳米和亚微米NiO添加剂对力学和耐电弧侵蚀性能的影响及机理。借助电子背散射衍射仪(EBSD)和扫描电子显微镜(SEM)等表征材料的微观结构及电弧侵蚀形貌... 为提高Ag-SnO_(2)电接触材料的综合性能,采用真空热复压技术实现了高效致密化,研究了纳米和亚微米NiO添加剂对力学和耐电弧侵蚀性能的影响及机理。借助电子背散射衍射仪(EBSD)和扫描电子显微镜(SEM)等表征材料的微观结构及电弧侵蚀形貌。结果表明:含纳米NiO添加剂的Ag-SnO_(2)材料的相对密度显著增加,高达99.78%,电导率超过72%IACS。纳米NiO添加剂能够增加材料的抗压强度,而亚微米NiO导致材料的极限应变出现下降趋势。NiO添加剂可显著改善Ag-SnO_(2)材料的耐电弧侵蚀性能,抑制电极表面高温蒸发和孔洞产生。由于燃弧能量明显下降和熔池粘度增加,材料的质量损失明显减少。与无NiO的材料相比,含有亚微米NiO材料的晶粒得到细化,质量损失最低,阳极和阴极分别下降36.5%和43.8%。 展开更多
关键词 ag-SnO_(2)材料 NiO添加剂 致密化 力学性能 电接触性能
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Ag基电接触材料的制备及其抗电弧侵蚀性能
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作者 付翀 路杨 +3 位作者 满生博 刘宇昕 李旭 周雄飞 《西安工程大学学报》 CAS 2024年第4期49-55,共7页
针对Ag基电接触材料抗电弧侵蚀性能差、电寿命短等问题,采用化学镀铜的方法对碳纤维表面改性,然后利用粉末冶金技术制备Ag基电接触材料。通过扫描电镜表征了碳纤维表面和Ag基电接触材料表面的微观形貌;通过电性能模拟开断系统对Ag基电... 针对Ag基电接触材料抗电弧侵蚀性能差、电寿命短等问题,采用化学镀铜的方法对碳纤维表面改性,然后利用粉末冶金技术制备Ag基电接触材料。通过扫描电镜表征了碳纤维表面和Ag基电接触材料表面的微观形貌;通过电性能模拟开断系统对Ag基电接触材料进行电弧侵蚀测试,测量了整体质量损失,表征了电弧侵蚀形貌。结果表明:碳纤维进行表面改性,能够有效提高与Ag基体的润湿性;相较于未添加碳纤维的AgSnO2电接触材料,碳纤维的加入能有效改善AgSnO2电接触材料抗电弧侵蚀性能。 展开更多
关键词 ag基电接触材料 碳纤维 微观形貌 电弧侵蚀
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放电电压对Ag-30vol%Ti_(3)SiC_(2)复合材料电弧烧蚀性能的影响
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作者 黄晓晨 颜宇 +3 位作者 丁云飞 葛金龙 吕长鹏 赵浩 《热加工工艺》 北大核心 2024年第14期73-78,共6页
采用热压烧结法制备Ag-30vol%Ti_(3)SiC_(2)复合材料,Ti_(3)SiC_(2)颗粒均匀分布于Ag基体上,无团聚和扩散现象。分别在3、6、8和10 kV的放电电压下,对Ag-30vol%Ti_(3)SiC_(2)复合材料进行了电弧烧蚀试验。结果表明,随着放电电压的增加,... 采用热压烧结法制备Ag-30vol%Ti_(3)SiC_(2)复合材料,Ti_(3)SiC_(2)颗粒均匀分布于Ag基体上,无团聚和扩散现象。分别在3、6、8和10 kV的放电电压下,对Ag-30vol%Ti_(3)SiC_(2)复合材料进行了电弧烧蚀试验。结果表明,随着放电电压的增加,电弧能量增加,电弧扩散更加明显,烧蚀面积逐渐增大,烧蚀坑越来越深。Ag-30vol%Ti_(3)SiC_(2)材料表面形成喷溅、凸起、气孔和“龟裂”的显微形貌。经过电弧烧蚀后,Ag-30vol%Ti_(3)SiC_(2)复合材料发生分解,并氧化生成AgO、Ag_(2)O、SiO_(2)和TiO_(2)。 展开更多
关键词 ag-30vol%Ti_(3)SiC_(2)复合材料 电接触材料 电弧烧蚀机理 显微组织 氧化
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Ag-Cd和Ag-Sn-In合金等温内氧化过程研究
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作者 杨文涛 缪仁梁 +2 位作者 万岱 陈潺 罗宝峰 《电工材料》 CAS 2024年第2期26-29,32,共5页
制备了8种不同成分的Ag-Cd和Ag-Sn-In合金,探究它们的等温内氧化过程,并表征了其氧化后不同区域的组织与硬度。结果表明:Ag-Cd和Ag-Sn-In合金的等温氧化曲线均呈现抛物线状。根据曲线总结出氧化厚度平方的对数与氧化时间对数的线性方程... 制备了8种不同成分的Ag-Cd和Ag-Sn-In合金,探究它们的等温内氧化过程,并表征了其氧化后不同区域的组织与硬度。结果表明:Ag-Cd和Ag-Sn-In合金的等温氧化曲线均呈现抛物线状。根据曲线总结出氧化厚度平方的对数与氧化时间对数的线性方程,并分析对比Ag-CdO和Ag-SnO_(2)-In2O_(3)触点的组织形貌及硬度。 展开更多
关键词 ag-CdO ag-SnO_(2)-In2O_(3) 内氧化 电接触材料
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金属氧化物对Ag-Ti_(3)SiC_(2)复合材料润湿性的影响研究
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作者 杨李林 黄晓晨 +2 位作者 凌德彬 郑浩 王佳杰 《安徽化工》 CAS 2024年第2期70-74,87,共6页
采用热压烧结法制备Ag-Ti_(3)SiC_(2)-MeO复合材料。体积分数为Ag-20%Ti_(3)SiC_(2)-10%MeO(La_(2)O_(3)、Bi_(2)O_(3)、CeO_(2)和In_(2)O_(3))的致密度分别为92.3%、99.44%、89.56%和91.4%。体积分数为Ag-20%Ti_(3)SiC_(2)-5%MeO(La_(2... 采用热压烧结法制备Ag-Ti_(3)SiC_(2)-MeO复合材料。体积分数为Ag-20%Ti_(3)SiC_(2)-10%MeO(La_(2)O_(3)、Bi_(2)O_(3)、CeO_(2)和In_(2)O_(3))的致密度分别为92.3%、99.44%、89.56%和91.4%。体积分数为Ag-20%Ti_(3)SiC_(2)-5%MeO(La_(2)O_(3)、Bi_(2)O_(3)、CeO_(2)和In_(2)O_(3))致密度分别为96.82%、98.87%、92.79%和95.55%。增加MeO有助于提高Ag-Ti_(3)SiC_(2)-MeO复合材料的润湿性,Ag-20%Ti_(3)SiC_(2)-5%MeO(La_(2)O_(3)、Bi_(2)O_(3)、CeO_(2)和In_(2)O_(3))的接触角分别为60.4°、60.5°、66°和51°。 展开更多
关键词 ag-Ti_(3)SiC_(2)复合材料 润湿性 接触角 金属氧化物
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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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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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Microstructure and properties of Ag–Ti_3SiC_2 contact materials prepared by pressureless sintering 被引量:12
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作者 min zhang wu-bian tian +3 位作者 pei-gen zhang jian-xiang ding ya-mei zhang zheng-ming sun 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第7期810-816,共7页
Ti3SiC2-reintbrced Ag-maJxix composites are expected to serve as eleclrical contacts. In this study, the wettability of Ag on a Ti3SiC2 subslxate was measured by the sessile drop melkod. The Ag-Ti3SiC2 composites were... Ti3SiC2-reintbrced Ag-maJxix composites are expected to serve as eleclrical contacts. In this study, the wettability of Ag on a Ti3SiC2 subslxate was measured by the sessile drop melkod. The Ag-Ti3SiC2 composites were prepared from Ag mad Ti3SiC2 powder mix- tures by pressureless sintering. The effects of compacting pressure (100-800 MPa), sintering temperature (850-950~C), mad soaking time (0.5-2 h) on the microslxucture mad properties of the Ag-Ti3SiC2 composites were investigated. The experimental results indicated that Ti3SiC2 paxticulates were uniformly distxibuted in flae Ag matrix, wiflaout reactions at the interthces between flae two phases. The prepared Ag-10wt%Ti3SiC2 had a relative density of 95% mad an electrical resistivity of 2.76 x 10 3 m~)'cm when compacted at 800 MPa mad sintered at 950~C for 1 h. The incorporation of Ti3SiC2 into Ag was found to improve its hardness without substantially compromising its electrical conductivity; INs behavior was attxibuted to the combination of ceramic and metallic properties of the Ti3SiC2 reinforcement, suggesting its potential application in electrical contacts. 展开更多
关键词 MAX phase ag-Ti3SiC2 contact materials WETTABILITY pressureless sintering
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Processing,Properties and Microstructures of Ag-ZnO Electrical Contact Composites
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作者 周继扣 马福康 +1 位作者 孙秀霞 刘茂林 《Rare Metals》 SCIE EI CAS CSCD 1998年第3期29-33,共5页
New powder metallurgy processing routes were designed to manufacture Ag ZnO electrical contact composites. Their physical properties, electrical contact properties and microstructures were investigated. By modelling ... New powder metallurgy processing routes were designed to manufacture Ag ZnO electrical contact composites. Their physical properties, electrical contact properties and microstructures were investigated. By modelling tests, it is shown that the requirements of commercial use were met. It is proved that Ag ZnO composites could be used to substitute toxic Ag CdO on large load electrical contactors. 展开更多
关键词 Electrical contact composites ag ZnO Internal oxidation ATOMIZATION
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Contact Mechanism of the Ag-doped Trimolybdate Nanowire as An Antimicrobial Agent 被引量:3
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作者 Yujie Jiang Jian Gang Sheng-Yong Xu 《Nano-Micro Letters》 SCIE EI CAS 2012年第4期228-234,共7页
Antibacterial Ag-agents are intensively applied as broad spectrum, high-stability, high-efficiency and high-safety inorganic antibacterial agents. We have developed a new kind of antibacterial Ag-agent, namely Ag_2-x(... Antibacterial Ag-agents are intensively applied as broad spectrum, high-stability, high-efficiency and high-safety inorganic antibacterial agents. We have developed a new kind of antibacterial Ag-agent, namely Ag_2-x(NH_4)xMo_3O_(10) ·3H_2O nanowires(NWs). Carrying Ag atoms in the lattice and Ag-rich nanoparticles on the surface, the Ag-doped NWs show strong antibacterial effects for a variety of bacteria including E.coli, Staphylococcus aureus, Candida albicans and Aspergil lus niger. By performing systematic comparison experiments, we have proven that the main antibacterial effects are neither resulted from the tiny amount of Ag+ions released from the Ag-doped NWs in aqueous solutions, nor resulted from Ag-rich nanoparticles of fragments of the NWs when they are slowly dissolved in the Martin broth. Instead, the effects are mainly resulted from a contact mechanism, under which, the Ag-doped NWs need to be physically in contact with the bacteria to be eliminated. This is a novel phenomenon observed in the interactions between nanomaterials and live cells, which is worthy of further investigation at the molecular scale. As the Ag-doped NWs are not dissolved in pure water or weak acids, one may find practical antibacterial applications in textile industry and food storage industry for these unique nanomaterials. 展开更多
关键词 Antibacterial agent Antibacterial ag-agent Silver ions Silver-rich nanoparticles Silver-doped trimolybdate nanowire Bio-safety of nanomaterials contact mechanism
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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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Ag-PMMA复合薄膜抗冲击性能的分子动力学研究
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作者 林高建 高文鹏 +1 位作者 陈鹏万 孙伟福 《高压物理学报》 CAS CSCD 北大核心 2023年第4期134-146,共13页
纳米尺度多层复合结构的动态冲击响应对半导体制造和微小粒子防护等具有重要意义。采用分子动力学方法模拟Si基底支撑的Ag-PMMA复合薄膜的抗冲击性能,通过对接触力响应、动能损耗、应力波传播、位错和损伤演化、侵彻深度等进行综合分析... 纳米尺度多层复合结构的动态冲击响应对半导体制造和微小粒子防护等具有重要意义。采用分子动力学方法模拟Si基底支撑的Ag-PMMA复合薄膜的抗冲击性能,通过对接触力响应、动能损耗、应力波传播、位错和损伤演化、侵彻深度等进行综合分析,解释了在衬底支撑条件下金属聚合物复合薄膜的能量耗散机制。结果表明,侵彻过程可以分为局部压缩阶段和整体变形阶段。在局部压缩阶段,Ag表面接触区域原子在高速冲击下由于应力集中效应直接转化为无定形结构,因而接触力达到侵彻过程的峰值。薄膜厚度主要在整体变形阶段产生影响:较薄的复合薄膜明显受到衬底的限制,在高速冲击下直接发生贯穿性损伤;而较厚的复合薄膜通过Ag的集体位错和PMMA的弹性变形耗散子弹动能,能够充分发挥各层材料特性。 展开更多
关键词 ag-PMMA复合薄膜 分子动力学 动态冲击 接触响应 损伤 位错演化
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Ag/p-GaN欧姆接触的图形化及表面处理工艺研究
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作者 殷杰 潘赛 +2 位作者 周玉刚 张荣 郑有炓 《半导体光电》 CAS 北大核心 2023年第5期694-698,共5页
研究了Ag/p-GaN欧姆接触的工艺,得到较为优化的工艺方法并应用于器件制备。分别采用直接剥离Ag、氧等离子体去底胶后剥离Ag和湿法腐蚀Ag三种工艺制备Ag图形,对比了三种工艺样品的粘附性及接触电性,发现直接剥离Ag工艺存在Ag脱落问题,去... 研究了Ag/p-GaN欧姆接触的工艺,得到较为优化的工艺方法并应用于器件制备。分别采用直接剥离Ag、氧等离子体去底胶后剥离Ag和湿法腐蚀Ag三种工艺制备Ag图形,对比了三种工艺样品的粘附性及接触电性,发现直接剥离Ag工艺存在Ag脱落问题,去底胶后剥离Ag工艺无法形成欧姆接触,而腐蚀后退火的样品则可以实现较好的粘附和较佳电性;通过XPS分析了不同工艺对接触特性影响的机理。进一步,对比优化了Ag蒸发前表面化学处理工艺,结果表明酸性溶液处理或碱性溶液处理可以有效降低欧姆接触电阻率,酸性溶液处理略优。优化后的欧姆接触工艺可应用于可见光及深紫外LED器件制备,器件电学性能如下:在40 A/cm~2电流密度下,蓝色发光二极管电压为2.95 V,紫外发光二极管电压为6.01 V。 展开更多
关键词 ag P-GAN 欧姆接触 发光二极管
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微量铈和铬对Cu-0.1Ag合金接触线的性能影响 被引量:6
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作者 刘平 刘喜波 +3 位作者 贾淑果 田保红 任凤章 董企铭 《稀有金属》 EI CAS CSCD 北大核心 2006年第1期39-42,共4页
采用显微硬度计、电子拉伸试验机、光学显微镜和TEM等,通过与Cu-0.1%Ag合金对比,分析了Cu-0.1%Ag-0.06%Ce合金和Cu-0.1%Ag-0.1%Cr合金的抗软化性能、合金元素的作用及组织形貌特征。结果表明:Cu-0.1%Ag合金中分别加入铬和稀土铈后,综合... 采用显微硬度计、电子拉伸试验机、光学显微镜和TEM等,通过与Cu-0.1%Ag合金对比,分析了Cu-0.1%Ag-0.06%Ce合金和Cu-0.1%Ag-0.1%Cr合金的抗软化性能、合金元素的作用及组织形貌特征。结果表明:Cu-0.1%Ag合金中分别加入铬和稀土铈后,综合性能明显提高,软化温度分别提高了110和35℃,稀土化合物以小球状分布在晶体内,细化晶粒,提高硬度(强度)和抗软化性能。 展开更多
关键词 铜合金 接触线 时效 铜银合金
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