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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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
