MANUFACTURE OF HIGHLY CORROSION-RESISTANT RARE-EARTH MAGNET

摘要

PURPOSE:To prevent occlusion of hydrogen into a magnet and a plated layer and hydrogen fragility of a magnet and then maintain high corrosion resistance and high-level magnetic characteristics over a long period of time by heating a rare-earth magnet subjected to Ni or Ni alloy plating within vacuum. CONSTITUTION:RE-B-Fe sintered rare-earth magnet or RE-TM-B hot machining rare-earth magnet (RE indicates one or more kinds of rare-earth elements and TM indicates one or more kinds of transition elements) which is subjected to Ni on Ni alloy plating is heated within vacuum at a temperature which is equal to or higher than 600 deg.C and less than 800 deg.C.