Rare earth magnet powder and method of producing the same
US7632360B2 · kind B2 · utility
2Cited by
0References
7Claims
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Key dates
| Filing date | May 13, 2004 |
| Grant date | Dec 15, 2009 |
| Priority date | — |
| Expiry date | Oct 23, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2991
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A rare earth magnet powder has a chemical composition which includes R: 5 to 20% (wherein, R represents one or two or more rare earth elements being inclusive of Y but exclusive of Dy and Tb), one or two of Dy and Tb: 0.01 to 10%, and B: 3 to 20%, with the balance comprising Fe and inevitable impurities; and an average particle diameter of 10 to 1,000 μm, wherein 70% or more of the entire surface of the rare earth magnet powder is covered with a layer being rich in the content of one or two of Dy and Tb and having a thickness of 0.05 to 50 μm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.