METHOD FOR MANUFACTURING R-T-B BASED SINTERED MAGNET

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To provide a method which enables the enhancement of magnet characteristics of an R-T-B based sintered magnet.SOLUTION : A method for manufacturing an R-T-B based sintered magnet comprises : a step of preparing R1-T-B based sintered magnet materials (R1 is a rare earth element, and T is Fe or a combination of Fe and Co); a step of preparing an alloy including 40 mass% or more of a rare earth element R2 necessarily including at least one of Dy and Tb; a step of performing a thermal treatment on the alloy at a temperature in a range from a temperature lower than a melting point of the alloy by 230°C up to the melting point and pulverizing the resultant alloy after the thermal treatment, thereby obtaining a diffusion source; and a diffusion step of setting the R1-T-B based sintered magnet materials and the diffusion source in a process chamber, and heating the R1-T-B based sintered magnet materials and the diffusion source to a temperature equal to or lower than a sintering temperature of the R1-T-B based sintered magnet materials to diffuse at least one of Dy and Tb included in the diffusion source from the surface of the R1-T-B based sintered magnet materials to inside. In the method, the alloy is an alloy produced by a strip cast method.SELECTED DRAWING : None