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Abstract
The fretting of palladium contacts was studied at conditions similar to those which occur in separable electronic connectors. It was found that frictional polymers which form on their surfaces in ordinary room air can cause contact resistance to increase to unacceptable levels. The effect is dependent on wipe distance, becoming greater with increasing length, and is especially bad at the ends of the wear track. Contact resistance is less variable when fluid contact lubricants are used. Although the volume of polymer which forms increases when lubricant is present, the polymers are nonadherent and tend to be dispersed even when small amounts of fluid are used. A solid lubricant was found to be ineffective in stabilizing contact resistance. Fluid lubricant coatings, therefore, may provide some relief from the contact resistance problems of frictional polymerization when palladium and other catalytically active materials are used in sliding applications.
Presented at the Eleventh International Conference on Electrical Contact Phenomena, West Berlin, Germany, June 7–11, 1982.
Notes
Presented at the Eleventh International Conference on Electrical Contact Phenomena, West Berlin, Germany, June 7–11, 1982.