High-performance NdFeB permanent magnet comprising nitride phase and production method thereof
US10563276B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2016 |
| Grant date | Feb 18, 2020 |
| Priority date | — |
| Expiry date | Apr 15, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0577
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A high-performance NdFeB permanent magnet including a nitride phase and a production method thereof are provided. A main phase of the NdFeB permanent magnet has a structure of R2T14B; a grain boundary phase is distributed around the main phase and contains N, F, Zr, Ga and Cu; a composite phase containing R1, Tb and N exists between the main phase and the grain boundary phase and includes a phase having a structure of (R1, Tb)2T14(B, N). R represents at least two rare earth elements, and includes Pr and Nd; T represents Fe, Mn, Al and Co; R1 represents at least one rare earth element, and includes at least one of Dy and Tb; the main phase contains Pr, Nd, Fe, Mn, Al, Co and B; and the grain boundary phase further contains at least one of Nb and Ti. Through placing partially B by N, a magnetic performance is increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.