R-Fe—B sintered magnet and making method
US9892831B2 · kind B2 · utility
7Cited by
1References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 31, 2016 |
| Grant date | Feb 13, 2018 |
| Priority date | — |
| Expiry date | Aug 30, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0573
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention provides an R—Fe—B sintered magnet consisting essentially of 12-17 at % of R, 0.1-3 at % of M1, 0.05-0.5 at % of M2, 4.8+2*m to 5.9+2*m at % of B, and the balance of Fe, containing R2(Fe,(Co))14B intermetallic compound as a main phase, and having a core/shell structure that the main phase is covered with a HR-rich layer and a (R,HR)—Fe(Co)-M1 phase wherein HR is Tb, Dy or Ho. The sintered magnet exhibits a coercivity ≧10 kOe despite a low content of Dy, Tb, and Ho.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.