R-T-B based sintered magnet

Details R-T-B based sintered magnet R-T-B based sintered magnet

2009-09-16

2010-06-22

Sheehan, John P (Department: 1793)

Metal treatment

Stock

Magnetic

C075S244000, C148S101000

Reexamination Certificate

active

07740715

ABSTRACT:
An R-T-B based sintered magnet according to the present invention has a composition comprising: 12 at % to 15 at % of a rare-earth element R; 5.0 at % to 8.0 at % of boron B; 0.1 at % to at % of Al; 0.02 at % to less than 0.2 at % of Mn; and a transition metal T as the balance. The rare-earth element R is at least one element selected from the rare-earth elements, including Y (yttrium), and includes at least one of Nd and Pr. The transition element T includes Fe as its main element.

REFERENCES:
patent: 5266128 (1993-11-01), Bogatin
patent: 2003/0098094 (2003-05-01), Hasegawa et al.
patent: 2006/0213584 (2006-09-01), Nakamura et al.
patent: 1 705 671 (2006-09-01), None
Tomizawa; “R-T-B Based Sintered Manet”, U.S. Appl. No. 12/132,689, filed Jun. 4, 2008.
Official Communication issued in corresponding European Patent Application No. 07742808.4, mailed on Jun. 19, 2009.
English translation of Official Communication issued in corresponding International Application PCT/JP2007/059373, mailed on Dec. 3, 2009.

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