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The Influence of Coating Technology on the Mechanical Performance of Thin, High Performance Connector Springs
Philip W. Lees and Ulrich Greschner
Technical Materials, Inc.
Lincoln, R.I.
Abstract
Size and weight reductions in consumer electronics such as cellular phones has resulted in miniaturization of components. This trend has resulted in the increased use of thin (0.005" thick) springs in connectors. These springs are highly loaded and therefore are manufactured from high performance alloys. In order to ensure reliable electrical contact, the springs are coated with noble metal in the contact areas. The coating application technology combined with the manufacturing process strategy can significantly influence the coating integrity, coating performance and spring rate in thin, highly loaded connectors. This paper presents a comparison of electroplated and clad connector contact springs used in cellular phones. Data after environmental an mechanical testing are presented and discussed. The results indicate that the coating technology does significantly influence thermal staibity, chemical reactivity and mechanical spring behavior.
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