摘要
研究了Ag -LaNiO3~δ电接触材料在直流电弧作用下弧区的元素分布、材料的微观组织形貌、直流电弧作用前后的电极形貌以及电极表面的元素分布 ;探讨了Ag -LaNiO3~δ电接触材料在直流电弧作用下的转移和腐蚀机理。实验结果表明 :直流电弧引起阳极表面熔化、Ag离子向阴极转移及在阴极表面沉积 ;LaNiO3~δ复合金属氧化物在电弧高温作用下分解成单元素 ,吸收了电弧能 ,有利于灭弧 ;同时LaNiO3~δ颗粒悬浮在阳极Ag微小熔池中 ,增加了熔融Ag的粘度 ,有利于降低Ag熔滴的飞溅 ,减少了电弧烧损。Ag -LaNiO3~δ复合电接触材料显示出良好的综合电性能。
The present research work aimed at study of the element distributing in both arc region and electrode surface, and the microstructure, and morphology in DC condition. The mechanism of erosion of the material Ag-LaNiO_ 3-δ in the DC arc was probed. The results showed that the DC arc bring about the surface melt in anode and the transfer of silver ion to cathode surface. The deposition of silver in cathode surface reduced the contact resistance. The decomposition of metal oxide LaNiO_3 was propitious to extinguish arc by absorbing the arc energy. Meanwhile the particles of LaNiO_3 suspended in the melt pool increased the viscosity of the melt, which, in turn, helped for reducing the splash of melt drop and the arc erosion. The Ag-LaNiO_ 3-δ contact material showed better performance than other materials in DC condition.
出处
《贵金属》
CAS
CSCD
2003年第3期12-16,共5页
Precious Metals
基金
国家 8 63基金资助项目 (2 0 0 1AA3 2 0 175 )