Ferrite sintered magnet and method for manufacturing ferrite sintered magnet
US12387875B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 8, 2022 |
| Grant date | Aug 12, 2025 |
| Priority date | — |
| Expiry date | Nov 18, 2043 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/80
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A ferrite magnet includes: a hexagonal ferrite main phase; and a second phase. The second phase is an oxide phase containing: an element A which is at least one selected from the group consisting of Ca, Sr, Ba, Bi, and rare earth elements; a transition metal element T including at least Fe; and an element G which is at least one selected from the group consisting of Si, Al, B, F, K, Na, Li, P, and S. When the total number of atoms of the element A, the transition metal element T, and the element G in the second phase is set to 100 at %, the element A occupies 30 to 80 at %, the element G occupies 15 to 40 at %, and the transition metal element T occupies less than 4 at %.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.