| 简介 |
To provide an R-Fe-B-based rare earth magnet that is excellent in squareness and magnetic properties at high temperatures, especially residual magnetization at high temperatures, and a manufacturing method thereof.SOLUTION : There are provided a rare earth magnet having a main phase 10, and a grain boundary phase 20 existing around the main phase 10 and a manufacturing method thereof according to the present disclosure. In the rare earth magnets disclosed in this disclosure, the overall composition in terms of molar ratio is represented by the formula (R1(1-x)Lax)y(Fe(1-z) Coz)(100-y-w-v)BwM1v (R1 is a predetermined rare earth element, M1 is a predetermined element and 0.02≤x≤0.1, 12.0≤y≤20.0, 0.1≤z≤0.3, 5.0≤w≤20.0, and 0≤v≤2.0). The main phase 10 has an R2Fe14B type crystal structure, the average particle size of the main phase 10 is 1 to 10 μm, and the volume ratio of the phase having a crystal structure of the RFe2 type in the grain boundary phase 20 is 0.60 or less with respect to the grain boundary phase 20.SELECTED DRAWING : Figure 1A |
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