Ferrite sintered magnet, ferrite particles, bonded magnet, and rotating electrical machine
US12243668B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2020 |
| Grant date | Mar 4, 2025 |
| Priority date | — |
| Expiry date | Nov 8, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/083
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A ferrite sinter magnet has a ferrite phase having a magnetoplumbite-type crystal structure, and contains at least a metal element A, a metal element R, Fe, Co, Zn, and B. The element A is at least one kind of element selected from the group consisting of Sr, Ba, Ca, and Pb, and essentially includes Ca. the element R is at least one kind selected from the group consisting of Bi and rare-earth elements including Y, and essentially includes La. Atomic ratios of the metal elements satisfy the following Expressions (1) to (5), A1-rReFexCoyZnz (1)0.40≤r≤0.70 (2)8.20≤x≤9.34 (3)0.05≤y≤0.50 (4)0<z≤0.20 (5)The content of Si is 0 to 0.60% by mass in terms of SiO2, and the content of B is 0.1-0.70% by mass in terms of B2O3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.