Fretting damage in tin-plated aluminum and copper connectors

Electrical Contacts, 1988., Proceedings of the Thirty Fourth Meeting of the IEEE Holm Conference on Electrical Contacts Pub Date : 1900-01-01 DOI:10.1109/33.31426

M. Braunovic

引用次数: 32

Abstract

A number of bolted-type tin-plated aluminum and copper connectors commonly used for distribution transformers were examined using scanning electron microscopy, energy-dispersive X-ray analysis, Auger electron spectroscopy, X-ray analysis, and optical microscopy. In addition, the contact resistance of the connector contact zones was measured using a point probe. The connectors studied had been removed from service because of unsatisfactory performance under normal operating conditions as manifested either by overheating or instability. The results of the detailed examination show the presence of extensive fretting damage in the contacting surfaces. The fretting debris was composed mainly of tin oxide and oxidized base metal particles. Localized melting and wear of the tin plating down to the underlying substrate were also observed in some of the connectors examined.<>

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镀锡铝和铜连接器的微动损坏

采用扫描电子显微镜、能量色散x射线分析、俄歇电子能谱、x射线分析和光学显微镜对配电变压器常用的一些螺栓式镀锡铝和铜连接器进行了研究。此外，使用点探针测量了连接器接触区的接触电阻。所研究的连接器已经停止使用，因为在正常工作条件下表现不理想，表现为过热或不稳定。详细检查的结果表明，接触面存在广泛的微动损伤。微动碎屑主要由氧化锡和氧化的贱金属颗粒组成。在一些被检查的连接器中，还观察到镀锡到底层基板的局部熔化和磨损。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electrical Contacts, 1988., Proceedings of the Thirty Fourth Meeting of the IEEE Holm Conference on Electrical Contacts

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