Nickel matrix composite electrocoatings as electrical contacts

The work presented in this paper explores the possibility of using composit e nickel matrix electrodeposits prepared under direct current (DC) and puls e current (PC) conditions as electrical contact materials. The codeposition of liquid-containing microcapsules (mu caps) along with the metal matrix f rom electrolytic baths leads to the development of new type of materials wi th prespecified properties: the liquid-containing metal electrocoatings, Th e incorporation, in the nickel matrix, of polymeric wall mu caps containing oil ensures a self-lubrication and cooling action during fretting or trans ient operation. The electrical properties of composite nickel electrodeposi ts have been investigated. Different preparation conditions have been emplo yed. Their contact resistance and interfacial temperature have been monitor ed for a great number of operation cycles during the simultaneous applicati on of mechanical and electrical fatigue. SEM and XRD analysis were applied toward investigating the structural characteristics of the inter-electrode surfaces.