新型Ag-CNTs电接触材料的制备及其性能
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摘要
采用化学沉积包覆和粉末冶金法,研制一种新型的Ag-CNTs电接触材料.利用电子万能试验机、触点材料测试系统、扫描电镜等分析手段,分析材料的微观组织和性能.结果表明:新材料具有优异的烧结致密度、电性能和加工性能,热挤压后密度可达理论密度的99.6%、电阻率仅为1.91μΩ·cm,优于相同工艺制备的Ag-Ni、Ag-Sn O2传统电接触材料.电弧侵蚀对比试验表明,同等条件下新材料电弧侵蚀量最小,且电寿命为上述2种传统材料的2倍.该材料有望成为一种可替代Ag-Ni、Ag-Sn O2的新型电接触材料.
A new type of Ag-CNTs electrical contact material was fabricated by chemical deposition coating and powder metallurgy method. The microstructure and performance of the new material were investigated with electronic testing machine, contact material testing system and scanning electron microscope. The results show that, compared with conventional Ag-Ni and Ag-Sn O2 electrical contact materials prepared by the same process,the new material enjoys advantages of superior sintered density, electrical property and processing property. Its density ratio and electrical resistivity are 99.6 % and 1.91 μΩ·cm, respectively. The comparative experimental results of arc erosion indicate that the mass loss of the new material by the same arc breaking condition is least and the service life of the material is twice as long as that of the above-mentioned two conventional materials.The newly developed Ag-CNTs may be substituted for Ag-Ni and Ag-Sn O2 as a new electrical contact material.
A new type of Ag-CNTs electrical contact material was fabricated by chemical deposition coating and powder metallurgy method. The microstructure and performance of the new material were investigated with electronic testing machine, contact material testing system and scanning electron microscope. The results show that, compared with conventional Ag-Ni and Ag-Sn O2 electrical contact materials prepared by the same process,the new material enjoys advantages of superior sintered density, electrical property and processing property. Its density ratio and electrical resistivity are 99.6 % and 1.91 μΩ·cm, respectively. The comparative experimental results of arc erosion indicate that the mass loss of the new material by the same arc breaking condition is least and the service life of the material is twice as long as that of the above-mentioned two conventional materials.The newly developed Ag-CNTs may be substituted for Ag-Ni and Ag-Sn O2 as a new electrical contact material.
引文
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[2]Xie J X,Cao S H,Bai X P,et al.Preparation of electrical contact materials by cold gas-spray[J].Rare Metal Materials and Engineering,2014,43(12):2989-2992.
[3]Lin Z J,Liu S H,Sun X D,et al.The effects of citric acid on the synthesis and performance of silver-tin oxide electrical contact materials[J].Journal of Alloys and Compounds,2014,588:30-35.
[4]王松,付作鑫,王塞北,等.银基电接触材料的研究现状及发展趋势[J].贵金属,2013,34(1):79-83.
[5]冯晶,陈敬超,肖冰,等.Ag-Sn合金的氧化过程与热力学性质[J].物理化学学报,2008,24(11):2007-2012.
[6]Wang S,Zheng T T,Xie M,et al.Internal oxidation thermodynamics and isothermal oxidation behavior of Ag Sn O2electrical contact materials[J].Rare Metal Material and Engineering,2014,43(4):796-798.
[7]Wang J,Liu W,Li D M,et al.The behavior and effect of Cu O in Ag/Sn O2materials[J].Journal of Alloys and Compounds,2014,588:378-383.
[8]Wang X H,Zou J T,Liang S H,et al.Effect of Y2O3addition on the microstructure and density of Ag Sn O2contact material[J].Journal of Ceramic Processing Research,2008,9(6):646-648.
[9]Zhu Y C,Wang J Q,An L Q,et al.Preparation and study of nano-Ag/Sn O2electrical contact material doped with titanium element[J].Rare Metal Materials and Engineering,2014,43(7):1566-1570.
[10]郑冀,高晶,李松林,等.新型银氧化锡电接触材料[J].稀有金属材料与工程,2005,34(3):483-485.
[11]李文生,李亚明,张杰,等.银基电接触材料的应用研究及制备工艺[J].材料导报,2011,25(11):34-39.
[12]Lungu M,Gavriliu S,Canta T,et al.Ag Sn O2sintered electrical contacts with ultrafine and uniformly dispersed microstructure[J].Journal of Optoelectronics and Advanced Materials,2006,8(2):576-581.
[13]凤仪,张敏,徐屹,等.压力对碳纳米管-银-石墨复合材料接触电压降的影响[J].金属功能材料,2005,12(4):11-14.
[14]徐屹,凤仪,王松林,等.电流密度对CNTs-Ag-G复合材料接触电压降和磨损性能的影响[J].摩擦学学报,2006,25(6):484-488.
[15]袁海龙.碳纳米管/银基复合材料的制备与性能研究[D].合肥:合肥工业大学,2004.
[16]余海峰,马学鸣,朱丽慧,等.新型Ag-5%C电接触材料的制备及其电弧磨损特性的研究[J].稀有金属,2004,28(1):1-4.
[17]Lekawa-Raus A,Haladyj P,Koziol K.Carbon nanotube fiber-silver hybrid electrical conductors[J].Materials Letters,2014,133:186-189.
[18]刘方方,陈敬超,郭迎春,等.反应合成Ag Sn O2电接触材料的电接触性能研究[J].稀有金属,2007,31(4):486-490.
[19]Zhou X L,Chen J C,Cao J C,et al.Fabrication research of silver copper oxide composite reactive synthesis[J].Rare Metal Materials and Engineering,2006,35(5):814-816.