RARE EARTH ELEMENT TRANSITION METAL BASE PERMANENT MAGNET ENHANCED IN CORROSION RESISTANCE AND MANUFACTURING METHOD THEREOF

摘要

PURPOSE:To provide the title R-TM-B permanent magnet enhanced in corrosion resistance and highly reliable in simple constitution. CONSTITUTION:The title permanent magnet is provided with a conductive underneath layer on the surface of a rare earth element transition metal base permanent magnet containing a transition metal mainly comprising Fe in addition to one or a combination of two or more rare earth elements containing yttrium as well as an electrolytic Cu plating layer in the mean crystal particle diameter not exceeding 0.9mum.