METHOD FOR MANUFACTURING RARE EARTH-IRON-BORON BASED SINTERED MAGNET

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PROBLEM TO BE SOLVED : To provide a method for manufacturing a RFeB based sintered magnet, which allows a RFeB based sintered magnet with a R6Fe13Ga-containing grain boundary layer formed therein to have a coercive force higher than a conventional one. SOLUTION : A method for manufacturing a RFeB based sintered magnet according to the present invention comprises : a mixed raw material powder-preparing step of preparing mixed raw material powder 11 by mixing first raw material powder 111 of a Ga-containing metal, and second raw material powder 112 consisting of powder of an alloy including a rare earth element R, Fe and B so that the percentage of R content is 30.0-33.0 mass%, the percentage of Fe content is 65.0-68.0 mass%, the percentage of B content is 0.8-0.9 mass%, and the percentage of Ga content is 0.2-0.6 mass%; an orientation step of orienting the mixed raw material powder 11 in a magnetic field; and a sintering step of sintering the mixed raw material powder 11 having gone through the orientation step. SELECTED DRAWING : Figure 1 COPYRIGHT : (C)2018, JPO&INPIT