R-T-B sintered magnet manufacturing method

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PROBLEM TO BE SOLVED : To provide a method for manufacturing an R-T-B based sintered magnet with a heavy rare earth element RH introduced to the center part thereof.SOLUTION : The method for manufacturing an R-T-B based sintered magnet comprises : a step of putting a magnet material and an RH diffusion source consisting of a metal or alloy of heavy rare earth elements RH (at least one sort of Dy and Tb) into a processing chamber in relatively movable, and approachable or contactable manners; an RH diffusion step of performing heat treatment at 800°C or more, and 1000°C or less for 10 minutes or more while continuously or intermittently moving the magnet material and the RH diffusion source in the processing chamber; and a step of performing the RH diffusion step again after performing surface processing to a manufactured magnet intermediate.