Rare earth permanent magnet and rare earth permanent magnet manufacturing method
US11264154B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 2017 |
| Grant date | Mar 1, 2022 |
| Priority date | — |
| Expiry date | Nov 19, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C2202/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A rare earth permanent magnet includes a main phase containing: a rare earth element R of one or more types including Nd; an element L of one or more types selected from a group consisting of Co, Be, Li, Al, and Si; B; and Fe, wherein crystals which form the main phase belong to P42/mnm; some of B atoms occupying a 4f site of the crystals are substituted with atoms of the element L; each distribution of Nd atoms and the atoms of the element L appears along a C-axis direction of the crystals in a plurality of cycles; and the rare earth permanent magnet includes an area where a cycle of the atoms of the element L matches a cycle of the Nd atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.