| 简介 |
The present invention comprises an M2 boride phase at the trigeminal triple point, and R1.1 Fe4B It does not comprise acompound phase, and the main phase (R, HR) 2 (Fe, (Co))14 B (R is a rare earth element, HR is Dy, Tb or Ho) is coated with an HR rich layer having a thickness of 0.01 to 1.0 μm, and is amorphous and / or 10 nm or less of the microcrystalline (R, HR) -Fe (Co)-M1 phase, or the corresponding (R, HR) -Fe (Co)-M1 phase and R is at least 50 atom% crystalline or 10nm or less of the uncrystalline and amorphous (R, HR) -M Having a core / shell structure coated by a granular phase comprising a phase1, the surface area coating ratio for the scaphoid having an HR rich layer of (R, HR) -Fe (Co) -M1 is at least 50%, and the phase width of the granular phase inserted into the scaphoid phase 2 particles is at least 10 nm, On average It relates to an R-Fe-B based sintered magnet. The magnets of the present invention impart a coercivity of at least 10 kOe in the content of Dy, Tb and Ho. |
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