MANUFACTURE OF RARE EARTH ELEMENT-IRON PERMANENT MAGNET

摘要

PURPOSE:To accurately control and to prompt processing by applying pressure and current to an aggregate composed of rare earth element-iron alloy thin piece fixed by a superhigh quenching method, and plastically deforming it to expand its axially projected area. CONSTITUTION:A rare earth element-iron alloy is frozen from a high- temperature melted state by a superhigh quenching method to form an aggregate secured with a thin alloy piece. Then, a DC of low frequency voltage is applied between electrodes in a low pressure state necessary to electrically connect the electrodes to the aggregate to be discharged. Thereafter, Joule heat for raising its pressure and heating is applied by energizing to accelerate its plastic deformation. The pressure is raised until pressure per axially projected area to be finally arrived by the plastic deformation reaches a predetermined value to conduct plastic deformation and atomic bonding in the contact boundaries between thin pieces. Thus, temperature rise and pressure control can be facilitated to accelerate its processing.