Iron-based rare-earth nanocomposite magnet and method for...

Details Iron-based rare-earth nanocomposite magnet and method for... Iron-based rare-earth nanocomposite magnet and method for...

2005-12-13

2010-11-30

Sheehan, John P (Department: 1793)

Metal treatment

Stock

Magnetic

C148S301000, C148S121000, C148S101000

Reexamination Certificate

active

07842140

ABSTRACT:
The iron-based rare-earth nanocomposite magnet of the present invention has a composition T100−x−y−z−nQxRyTizMn, where T is Fe or a transition metal element in which Fe is partially replaced by Co and/or Ni; Q is B and/or C; R is at least one rare-earth element including substantially no La or Ce; and M is at least one metal element selected from Al, Si, V, Cr, Mn, Cu, Zn, Ga, Zr, Nb, Mo, Ag, Hf, Ta, W, Pt, Au and Pb. x, y, z and n satisfy 5≦x≦10 at %, 7≦y≦10 at %, 0.1≦z≦5 at % and 0≦n≦10 at %, respectively. The magnet includes R2Fe14B-type compound phases and α —Fe phases forming a magnetically coupled nanocomposite magnet structure. The R2Fe14B-type compound phases have an average crystal grain size of 30 nm to 300 nm and the α —Fe phases have an average crystal grain size of 1 nm to 20 nm. The magnet has magnetic properties including a coercivity of at least 400 kA/m and a remanence of at least 0.9 T.

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Official communication issued in counterpart Japanese Application No. 2006-519681, mailed on Mar. 18, 2008.
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