R-FE-B based rare earth permanent magnet material

Details R-FE-B based rare earth permanent magnet material R-FE-B based rare earth permanent magnet material

2005-06-20

2009-02-03

Sheehan, John P. (Department: 1793)

Metal treatment

Stock

Magnetic

C420S083000, C420S121000

Reexamination Certificate

active

07485193

ABSTRACT:
A R—Fe—B base rare earth permanent magnet material consists of, in percents by weight, 25 to 45 wt % of R, 0.1 to 4.5 wt % of Co, 0.8 to 1.4 wt % of B, 0.05 to 3.0 wt % of Al, 0.02 to 0.5 wt % of Cu, 0.03 to 0.5 wt % of M, 0.01 to 0.5 wt % of C, 0.05 to 3.0 wt % of O, 0.002 to 0.1 wt % of N, 0.001 to 2.0 wt % of F, with the balance of Fe and incidental impurities, wherein R is at least one element selected from among Nd, Pr, Dy, Tb and Ho, and M is at least one element selected from among Zr, Hf, Ti, Cr, Nb, Mo, Si, Sn, Zn, V, W and Cr.

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