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Anti-Arc Erosion Properties of Ag-La2Sn2O7SnO2 Contacts.pdf
Rare Metal Materials and Engineering Volume 45, Issue 7, July 2016 Online English edition of the Chinese language journal
Cite this article as: Rare Metal Materials and Engineering, 2016, 45(7): 1664-1668.
ARTICLE
Anti-Arc Erosion Properties of Ag-La2Sn2O7/SnO2 Contacts
Zhang Lingjie1, 2, Shen Tao2, Shen Qianhong1, 2, Zhang Ji2, Chen Lawson2, 3, Fan Xianping1,2, Yang Hui1,2
1 Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China; 2 Zhejiang-California International Nanosystems Institute, Zhejiang University, Hangzhou 310058, China; 3 Wenzhou Hongfeng Electrical Alloys Co. Ltd, Wenzhou 325603, China
Abstract: La2Sn2O7/SnO2 composite powder was synthesized by chemical co-precipitation, and Ag-La2Sn2O7/SnO2 electrical contact material was prepared by a powder metallurgy method. Anti-arc erosion properties, mass loss and Vickers hardness of the Ag-La2Sn2O7/SnO2 composite were investigated, and its anti-arc erosion mechanism was discussed. Results show that the welding force of Ag-La2Sn2O7/SnO2 composite is much better than that of Ag-SnO2, because the new phase La2Sn2O7 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-La2Sn2O7/SnO2 composite could be a leading candidate material for electrical contacts in the future.
Key words: electrical contact material; silver; La2Sn2O7/SnO2; arc erosion; welding force
Silver-metal oxide (Ag-MeO) electrical contacts with outstanding electrical and endurance qualities play an important role in high reliability components of distribution switches, circuit breakers and contactors, among which, silver-cadmium oxide (Ag-CdO) has excellent comprehensive properties, such as a
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