RARE EARTH PERMANENT MAGNET AND PRODUCTION METHOD FOR RARE EARTH PERMANENT MAGNET

摘要

Provided is a rare earth permanent magnet that can achieve increased holding force through use of Cu, and that additionally suppresses the decomposition of a main component and the precipitation of αFe and does not experience reductions in magnetic properties, even if calcination is performed in an oxygen atmosphere. Also provided is a production method for a rare earth permanent magnet. In the present invention, a magnet source material that does not include Cu is, crushed and a calcination process is conducted whereby a molded body that is formed by molding is kept in an oxygen atmosphere at 200℃-900℃ for several hours to several tens of hours. Afterward, the molded body is sintered by means of vacuum sintering or pressure sintering, and a permanent magnet is produced by sputtering the surface of the sintered body with Cu.