Abstract
Metal-graphite brushes are produced by 10-40% graphite, 0.1-10% lead and the rest copper by powder metallurgy. In this investigation copper-lead-alloy coated graphite powder invented by the author is used instead of employing individual powder. In this coated powder method, the distribution of copper, lead and graphite is uniform and the combination of metal and graphite is tight remarkably as compared with in ordinary method. Therefore, the characteristics of the brush…abrasiveness, cross braking strength, electrical resistivity, wearing etc…show superior results.
