| 简介 |
A method includes : manufacturing a sintered compact represented by (R1)x(Rh)yTzBsMt and has a grain boundary phase; manufacturing a rare earth magnet precursor from the sintered compact; and performing a heat treatment on the rare earth magnet precursor at 450°C to 700°C to diffuse and to infiltrate a melt of a modified alloy containing a light rare earth element and either a transition metal element, Al, In, Zn, or Ga into the grain boundary phase. R1 represents a light rare earth element. Rh represents Dy or Tb. T represents a transition metal containing at least one of Fe, Ni, and Co. B represents boron. M represents at Ga, Al, or Cu. x, y, z, s, and t represent mass% of R1, Rh, T, B, and M. Following expressions are established : 27≤x≤44, 0≤y≤10, z=100-x-y-s-t, 0.75≤s≤3.4, 0≤t≤3. An infiltration amount of the modified alloy is 0 mass% to 5 mass%. |
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