Rare earth magnet powder and method of producing the same

Details Rare earth magnet powder and method of producing the same Rare earth magnet powder and method of producing the same

2004-05-13

2009-12-15

Sheehan, John P. (Department: 1793)

Metal treatment

Stock

Magnetic

C428S403000, C148S101000, C148S105000, C148S122000

Reexamination Certificate

active

07632360

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.

REFERENCES:
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patent: 2005-97711 (2005-04-01), None

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