White Papers Request
Atlas Pressed Metals has a staff of highly experienced powder metal experts that periodically publish white papers that may be of interest to engineers and other industry professionals. Feel free to click on the link(s) below to request access to read the full paper(s).
Topic
Diffusion Bonding of Bi-Layered Silver Graphite-Copper Electrical Contacts
Due to economic considerations, companies that produce electrical contacts are shifting from single-layered to bi-layered electrical contacts. In this method, a thin layer of refractory based material (e.g. silver-graphite, silver-tungsten, silver-tungsten carbide) is bonded to a layer of pure copper (Cu) to create a bi-layered contact. Unfortunately, the traditional press, sinter, repress method has not been successful in producing bi-layered (clad) silver graphite (AgC)-Cu electrical contacts due to the presence of carbon (graphite) at the interface, as carbon is not diffusible into either silver or copper. This leaves a poor interface between the AgC section and the copper section decreasing the shear strength of the joint. This paper presents the results on the use ofNiCr and Fe interlayers for diffusion bonding of bi-layered AgCu electrical contacts...
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