METHOD FOR MANUFACTURING R-T-B BASED SINTERED MAGNET

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PROBLEM TO BE SOLVED : To efficiently diffuse RH, which is a heavy rare earth element, in an R-T-B based sintered magnet. SOLUTION : A method for manufacturing an R-T-B based sintered magnet comprises step of performing a thermal treatment at or under a sintering temperature of the R-T-B based sintered magnet with powder of RLM alloy (where RL represents Nd and/or Pr, M represents at least one selected from Cu, Fe, Ga, Co and Ni) and powder of RH oxide (where RH represents Dy and/or Tb) present on the surface of an R-T-B based sintered magnet. The RLM alloy includes 65 atom% or more of RL. The RLM alloy has a melting point equal to or below a temperature of the thermal treatment. The thermal treatment is performed under the condition that the RLM alloy powder and the RH oxide powder are present on the surface of the R-T-B based sintered magnet in the mass proportion given by RLM alloy : RH oxide=9.6 : 0.4-5 : 5. SELECTED DRAWING : None COPYRIGHT : (C)2016, JPO&INPIT