R-Fe-B-based sintered rare earth magnet and its manufacturing method

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PROBLEM TO BE SOLVED : To provide an R-Fe-B-based rare-earth sintered magnet which effectively uses a heavy rare earth element as a rare resource and whose consumption is reduced. SOLUTION : In the manufacturing method of the R-Fe-B-based rare-earth sintered magnet, a bulk body 2 containing the heavy rare earth element RH (at least one selected from a group of Dy, Ho, and Tb) is disposed in a treatment chamber 11, which is then heated at 700 to 1, 100°C to form an RH steam atmosphere at least in the vicinity of the bulk body 2 in the treatment chamber 11. Then an R-Fe-B-based rare earth sintered magnet body 1 is carried in the treatment chamber 11 and held for 10 to 600 minutes while arranging the R-Fe-B-based rare earth sintered magnet body 1 opposed to the bulk body 2. Thus, the heavy rare earth element RH is diffused into the sintered magnet body 1 while supplying the heavy rare earth element RH to the surface of the sintered magnet body 1. COPYRIGHT : (C)2009, JPO&INPIT