METHOD FOR PRODUCING RARE EARTH MAGNET

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PROBLEM TO BE SOLVED : To provide a method for producing a rare earth magnet superior in coercive force performance as well as magnetization even if with a high main phase percentage. SOLUTION : A method for producing a rare earth magnet comprises the step of producing a sintered compact having a structure expressed by the following compositional formula and including a main phase and a grain boundary phase : (Rl1-xR2x)aTMbBcMd (where Rl represents one or more rare earth element including Y; R2 represents a rare earth element different from Rl; TM represents a transition metal including one or more of Fe, Ni, and Co; B represents boron; M represents at least one or more of Ti, Ga, Zn, Si, Al, Nb, Zr, Ni, Co, Mn, V, W, Ta, Ge, Cu, Cr, Hf, Mo, P, C, Mg, Hg, Ag, and Au; 0.01≤x≤1; 12≤a≤20; b=100-a-c-d; 5≤c≤20; and 0≤d≤3, which are given in the unit of at%). The method for producing a rare earth magnet further comprises the steps of : producing a rare earth magnet precursor by performing a hot plastic work; and producing the rare earth magnet by causing a melt of a quality-modified R3-M alloy (R3 represents a rare earth element including R1 and R2) to diffuse and infiltrate into a grain boundary phase of the precursor. COPYRIGHT : (C)2015, JPO&INPIT