Rare-earth permanent magnetic powder, bonded magnet containing thereof and device using the bonded magnet
US10079085B2 · kind B2 · utility
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14Claims
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Key dates
| Filing date | May 31, 2013 |
| Grant date | Sep 18, 2018 |
| Priority date | — |
| Expiry date | Jul 7, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C2202/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A rare-earth permanent magnetic powder, a bonded magnet containing thereof and a device using the bonded magnet are provided of the present disclosure. The rare-earth permanent magnetic powder comprises: 70 vol % to 99 vol % of a hard magnetic phase and 1 vol % to 30 vol % of a soft magnetic phase, the hard magnetic phase has a TbCu7 structure, and the grain size of the hard magnetic phase is 5 nm to 100 nm; the soft magnetic phase is a Fe phase having a bcc structure, the average grain size of the soft magnetic phase is 1 nm to 30 nm, and the standard deviation of the grain size is below 0.5σ.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.