METHOD FOR PRODUCING R-T-B-BASED SINTERED MAGNETS

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A method for producing R-T-B-based sintered magnets includes : a step for preparing R-T-B-based sintered magnet bodies (1); a step for preparing RH diffusion sources that contain a heavy rare earth element (RH) (comprising Dy and/or Tb) and Fe with a mass% of 30 to 80; a step for charging the R-T-B-based sintered magnet bodies (1) and the RH diffusion sources (2) into a processing chamber (3) in such a manner that the R-T-B-based sintered magnet bodies (1) and the RH diffusion sources (2) can move relatively, and can come close to each other or come into contact with each other; and an RH diffusion step for heating the sintered magnet bodies (1) and the RH diffusion sources (2) at a temperature of 850°C to 1000°C while moving the sintered magnet bodies (1) and the RH diffusion sources (2) continuously or intermittently in the processing chamber (3).