R-Fe-B sintered magnet

Details R-Fe-B sintered magnet R-Fe-B sintered magnet

2006-08-15

2006-08-15

Sheehan, John P. (Department: 1742)

Metal treatment

Stock

Magnetic

C075S230000, C075S244000, C075S246000

Reexamination Certificate

active

07090730

ABSTRACT:
An R—Fe—B base sintered magnet having a composition of 12–17 at % of R (wherein R stands for at least two of yttrium and rare earth elements and essentially contains Nd and Pr), 0.1–3 at % of Si, 5–5.9 at % of B, 0–10 at % of Co, and the balance of Fe, containing a R2(Fe,(Co),Si)14B intermetallic compound primary phase and at least 1% by volume of an R—Fe(Co)—Si grain boundary phase, and being free of a B-rich phase exhibits a coercive force of at least 10 kOe despite a reduced content of heavy rare earth.

REFERENCES:
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patent: 2002/0112785 (2002-08-01), Sekine et al.
patent: 2003/0019546 (2003-01-01), Kanekiyo et al.
patent: 2006/0016515 (2006-01-01), Tomizawa et al.
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patent: 2610798 (1997-02-01), None
Chen et al., J. of Magnetism & Magnetic Materials, vol. 162, pp. 307-313, (1996).

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