Lubrication mechanisms of hot-dipped tin separable electrical contacts

Proceedings of the Forth-Seventh IEEE Holm Conference on Electrical Contacts (IEEE Cat. No.01CH37192) Pub Date : 2001-09-10 DOI:10.1109/HOLM.2001.953210

S. Noel, N. Lecaude, D. Alamarguy, L. Tristani

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引用次数: 8

Abstract

Degradation phenomena occurring during the lifetime of tinned separable electrical contacts remain a factor of loss of reliability that can be minimised. In a previous paper, friction, wear and electrical properties of hot-dipped tin coatings on bronze substrates have been analysed with various techniques in order to show the improvement due to a well-suited fluorinated lubricant layer. Contacts were of the sphere on plane type obtained from strips of tinned CuSn/sub 4/ (as received for the flats, and formed by stamping for the dimples). Macroscopic friction cycles simulating insertion and withdrawal of separable contacts were performed as well as fretting cycles. Efficiency of the lubricant was strongly related to the film thickness in the case of macroscopic friction of dimple on flat contacts. For a sufficient film thickness, different behaviours were observed for different molecules. Here, the particularity of lubrication mechanisms of hot-dipped tin contacts is analysed. The evolution of static contact resistance values before friction and during the friction tests correlated to the wear behaviour shows the influence of some of the lubricant properties such as viscosity and chain structure.

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热浸锡可分离电触点的润滑机理

在锡制可分离电触点的使用寿命期间发生的退化现象仍然是一个可以最小化的可靠性损失因素。在之前的一篇论文中，用各种技术分析了青铜基板上热浸锡涂层的摩擦、磨损和电气性能，以显示由于合适的氟化润滑层而得到的改善。触点是平面上的球形触点，从镀锡CuSn/ sub4 /条中获得(作为平面接收，并通过冲压形成凹窝)。模拟可分离接触的插入和退出进行宏观摩擦循环和微动循环。在平面接触表面的凹痕宏观摩擦情况下，润滑油的效率与膜厚密切相关。对于足够的薄膜厚度，不同的分子可以观察到不同的行为。分析了热浸锡触点润滑机理的特殊性。摩擦前和摩擦过程中静态接触阻力值的变化与磨损行为的关系表明，润滑剂的一些特性(如粘度和链结构)对其有影响。

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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Proceedings of the Forth-Seventh IEEE Holm Conference on Electrical Contacts (IEEE Cat. No.01CH37192)

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