METHOD OF PRODUCING R-T-B-BASED SINTERED MAGNET

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PROBLEM TO BE SOLVED : To provide a diffusion treatment of a heavy rare-earth element RH exhibiting excellent mass productivity.SOLUTION : A method of producing an R-T-B-based sintered magnet includes a step for preparing an R-T-B-based sintered magnet body, a step for preparing an RH diffusion source consisting of an R-T-B-based alloy where the content of a heavy rare-earth element RH (at least any one kind of Dy, Tb) is higher by at least 0.5 mass% than the content of the R-T-B-based sintered magnet body, a step for charging the R-T-B-based sintered magnet body and the RH diffusion source into a processing container so that they can move relatively and can approach or come into contact with each other, and an RH diffusion step for performing heat treatment at 800-1000°C while moving the R-T-B-based sintered magnet body and the RH diffusion source continuously or intermittently in a processing chamber.COPYRIGHT : (C)2012, JPO&INPIT