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陈静洪,陈松,李幕阳,谢明,任县利.AgSnO2电接触材料熔桥行为的高速摄像研究[J].稀有金属材料与工程(英文),2017,46(12):3613~3620.[Chen Jinghong,Chen Song,Li Muyang,Xie Ming and Ren Xianli.High speed imaging observation on molten bridge of AgSnO2 electrical contact material[J].Rare Metal Materials and Engineering,2017,46(12):3613~3620.]
High speed imaging observation on molten bridge of AgSnO2 electrical contact material
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Received:November 20, 2015  Revised:March 29, 2016
DOI:
Key words: molten bridge  high speed imaging  arc  AgSnO2 electrical contact material
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Chen Jinghong,Chen Song,Li Muyang,Xie Ming and Ren Xianli  
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Abstract:
      In this paper, an electrical contact-high speed imaging experimental system is developed to study the basic characteristics and laws of molten bridges of AgSnO2 electrical contact material under different loads. On the one hand, the quantitative measurements are investigated by high speed imaging technology. On the other hand, the microstructure and element distribution on the surface of contacts are analyzed by SEM and EDS after molten bridges behavior. Results indicate that the evolution behavior of AgSnO2 contacts can be divided into three regimes: the initial melting period, a stable period and an unstable period during which it eventually ruptures. Molten bridges and arc can exist simultaneously in which there is some cooperation and competition relationship. The dimension of molten bridges of AgSnO2 contact material is micron scale (0.027-0.295 mm), the diameter of molten bridges increases with the increase of current and the length decreases with the increase of current. In the process of the evolution behavior of molten bridges, the feature of molten bridges can be divided into three types: the pier, follow by the cylindrical and the dumbbell. The morphology and element distribution of the contacts surface are changed by the behavior of molten bridges.