Ag-La_2Sn_2O_7/SnO_2电接触材料的抗电弧侵蚀特性研究（英文）  

Anti-Arc Erosion Properties of Ag-La_2Sn_2O_7/SnO_2 Contacts

作　　者：张玲洁[1,2] 沈涛[2] 申乾宏[1,2] 张继[1] 陈乐生[2,3] 樊先平[1,2] 杨辉[1,2] 

机构地区：[1]浙江大学材料科学与工程学院,浙江杭州310027 [2]浙江大学浙江加州国际纳米技术研究院,浙江杭州310058 [3]温州宏丰电工合金股份有限公司,浙江温州325603

出　　处：《稀有金属材料与工程》2016年第7期1664-1668,共5页Rare Metal Materials and Engineering

基　　金：National High Technical Research and Development Program of China("863"Program)(2013AA031803);Special Fund for Postdoctor of Zhejiang Province,China

摘　　要：采用化学共沉淀法合成了La_2Sn_2O_7/SnO_2复合粉体,并通过粉末冶金法制备了Ag-La_2Sn_2O_7/SnO_2电接触材料;研究了复合材料的抗电弧侵蚀性能,并对抗电弧侵蚀机理进行了探讨。结果表明:与Ag-SnO_2相比,Ag-La_2Sn_2O_7/SnO_2电接触材料经电弧作用后表面形貌较为平整,表现出较低的熔焊力。这可能是由于在电弧作用下La_2Sn_2O_7的存在有助于提高熔池的粘滞性,同时Ag-La_2Sn_2O_7/SnO_2触点表面分布的"小汗珠"状颗粒物能够起到分散电弧能量的作用,从而可以降低侵蚀区域的温升、减弱表面结构的破坏程度,获得较好的抗熔焊性能。Ag-La_2Sn_2O_7/SnO_2有望作为一种环保型电接触材料得到广泛应用。La_2Sn_2O_7/SnO_2 composite powder was synthesized by chemical co-precipitation,and Ag-La_2Sn_2O_7/SnO_2 electrical contact material was prepared by a powder metallurgy method.Anti-arc erosion properties,mass loss and Vickers hardness of the Ag-La_2Sn_2O_7/SnO_2 composite were investigated,and its anti-arc erosion mechanism was discussed.Results show that the welding force of Ag-La_2Sn_2O_7/SnO_2 composite is much better than that of Ag-SnO_2,because the new phase La_2Sn_2O_7 can increase the viscosity of melt pool and improve wettability between silver and tin oxide to some extent.Meanwhile,Flatter arcing area and＂beads-like＂ particles embedded scatteredly in the surface could decentralize arc energy via ＂pinning effect＂,which decreases temperature rise and weakens the damage of surface structure,and better anti-welding property is obtained.Ag-La_2Sn_2O_7/SnO_2 composite could be a leading candidate material for electrical contacts in the future.

关 键 词：电接触材料 银 La_2Sn_2O_7/SnO_2 电弧侵蚀 熔焊力 

分 类 号：TM24[一般工业技术—材料科学与工程] TF125[电气工程—电工理论与新技术]