METHOD OF MANUFACTURING RARE EARTH MAGNET

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PROBLEM TO BE SOLVED : To provide a method of manufacturing a rare earth magnet capable of diffusion/infiltration of modification alloy for enhancing a coercive force (especially coercive force under a high temperature atmosphere) at a lower temperature compared with a conventional manufacturing method for a rare earth magnet, with no use of heavy rear earth metal such as Dy and Tb, thereby allowing manufacturing of a rare earth magnet of high coercive force at a cost as low as possible. SOLUTION : A method of manufacturing a rare earth magnet includes a first step in which a compact S is manufactured by pressure molding with powder which is to be rare earth magnet material and contains main phase MP of RE-Fe-B system (RE : At least one kind of Nd, Pr) and grain boundary phase BP of RE-X alloy (X : metal element) which is around the main phase MP, and a second step in which a rare earth magnet RM is manufactured by causing a modification alloy M made from RE-Y alloy (Y : metal element not containing heavy rare earth element) having eutectic crystal or RE-rich super eutectic crystal to contact to a compact S or a rare earth magnet precursor C made by hot plastic processing with the compact S, for thermal treatment, so that molten liquid of the modification alloy M is diffused and infiltrated in the compact S and the rare earth magnet precursor C, thus manufacturing the rare earth magnet RM. COPYRIGHT : (C)2013, JPO&INPIT