Significant increase of contact resistance of silver contacts by mechanical switching actions

Electrical Contacts - 1991 Proceedings of the Thirty-Seventh IEEE HOLM Conference on Electrical Contacts Pub Date : 1900-01-01 DOI:10.1109/33.142892

M. Hasegawa, T. Yamamota, K. Sawa

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引用次数: 8

Abstract

When Ag contacts were operated in mechanical break-make actions without switching load current in air (laboratory atmosphere), contact resistance increased significantly on about three quarters of the test samples. No contaminant products were detected in the contact area with AES (Auger electron spectroscopy) analysis. However, SEM (scanning electron microscopy) observation revealed an interesting relationship between the contact resistance characteristic and contact surface condition. The samples on which contact resistance increased had a mirror-like plain contact surface, while those with low and stable contact resistance had a rough surface which looked severely damaged by mechanical actions. The contact resistance characteristic was also found to be influenced by measuring current levels and contact force levels. With these experimental results, a possible hypothetical mechanism for the phenomenon is discussed considering the influence of wear types of the electrode surface.<>

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机械开关动作使银触点接触电阻显著增加

当Ag触点在空气(实验室气氛)中以机械断开动作操作而不切换负载电流时，约四分之三的测试样品的接触电阻显着增加。AES(俄歇电子能谱)分析未检出接触区有污染产物。然而，扫描电子显微镜(SEM)观察显示了接触电阻特性与接触面状况之间的有趣关系。接触电阻增大的样品表面呈镜面状，而接触电阻较低且稳定的样品表面粗糙，看起来受到机械作用的严重破坏。接触电阻特性也受到测量电流水平和接触力水平的影响。根据这些实验结果，考虑到电极表面磨损类型的影响，讨论了这种现象的可能假设机制。

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Electrical Contacts - 1991 Proceedings of the Thirty-Seventh IEEE HOLM Conference on Electrical Contacts

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