Rare-earth permanent magnet
US11302465B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2017 |
| Grant date | Apr 12, 2022 |
| Priority date | — |
| Expiry date | Oct 18, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
To provide a rare earth permanent magnet having as a main phase a compound with a Nd5Fe17 crystalline structure having strong coercive force. A rare earth permanent magnet having as a main phase a compound with a Nd5Fe17 crystalline structure, wherein when the composition ratio of the rare earth permanent magnet is expressed as RaT(100-a-b)Cb, where R is one or more rare earth elements requiring Sm, and T is one or more transition metal elements requiring Fe or Fe and Co, a and b satisfy 18<a<40 and 0.5≤b, and a phase where R and C are denser than the main phase is provided in the grain boundary phase of the rare earth permanent magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.