RARE EARTH METAL-BASED PERMANENT MAGNET, AND PROCESS FOR PRODUCING THE SAME

摘要

A RARE EARTH METAL-BASED PERMANENT MAGNET HAS A FILM LAYER FORMED SUBSTANTIALLY OF ONLY A FINE METAL POWER ON A METAL FORMING THE SURFACE OF THE MAGNET. THE RARE EARTH METAL-BASED PERMANENT MAGNET HAVING THE FILM LAYER ON ITS SURFACE IS PRODUCED IN THE FOLLOWING MANNER; A RARE EARTH METAL-BASED PERMANENT MAGNET AND A FINE METAL POWDER FORMING MATERIAL ARE PLACED INTO A TREATING VESSEL, WHERE BOTH OF THEM ARE VIBRATED AND/OR AGITATED, WHEREBY A FILM LAYER MADE OF A LINE METAL POWDER PRODUCED FROM THE FINE METAL POWDER PRODUCING MATERIAL IS FORMED ON A METAL FORMING THE SURFACE OF THE MAGNET. THUS, THE FORMATION OF A CORROSION-RESISTANCE FILM SUCH AS PLATED FILM CAN BE ACHIVED AT A HIGH THICKNESS ACCURACY BY FORMING AN ELECTRICALLY CONDUCTIVE LAYER UNIFORMLY AND FIRMLY ON THE ENTIRE SURFACE OF THE MAGNET WITHOUT USE OF A THIRD COMPONENT SUCH AS A RESIN AND A COUPLING AGENT.