| 简介 |
To provide an R-Fe-B-based rare earth magnet excellent in the squareness and magnetic properties at high temperatures, particularly, the residual magnetization at high temperatures, and method for producing thereof.
The present disclosure relates to a rare earth magnet including a main phase 10 and a grain boundary phase 20 present around the main phase 10, and a method for producing thereof. In the rare earth magnet of the present disclosure, the overall composition is represented, in terms of molar ratio, by the formula : (R1(1-x)Lax)y(Fe(1-z)Coz)(100-y-w-v)BwM1v or (R1(1-x)Lax)y(Fe(1-z)Coz)(100-y-w-v)BwM1v·(R2(1-s)M2s)t, wherein R1 is a predetermined rare earth element, M1 is a predetermined element, 0≤x≤0.1, 12.0≤y≤20.0, 0.1≤z≤0.3, 5.0≤w≤20.0, 0≤v≤2.0, 0.05≤s≤0.40, and0.1≤t≤10.0,
The main phase 10 has an R2Fe14B-type crystal structure, the average particle diameter of the main phase 10 is less than 1 µm, and the volume ratio of a phase having an RFe2-type crystal structure in the grain boundary phase 20 is 0.40 or less relative to the grain boundary phase 20. |
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