Permanent magnet and method for producing same

Details Permanent magnet and method for producing same Permanent magnet and method for producing same

1990-08-23

1995-01-31

Sheehan, John P.

Metal treatment

Stock

Magnetic

420 83, 420121, H01F 104

Patent

active

RE0348384

ABSTRACT:
In the rare earth-iron-boron permanent magnet, Ce and La decrease the magnetic properties when used alone but synergistically enhance iHc when used in combination.
The composition provided by the present invention is generally expressed by [(Ce.sub.x La.sub.1-x).sub.y R.sub.1-y ].sub.2 [(Fe.sub.1-u-w Co.sub.w M.sub.u).sub.1-v B.sub.v ].sub.1-z with a proviso of 0.4.ltoreq.x.ltoreq.0.9, 0.2<y.ltoreq.1.0, 0.05.ltoreq.z.ltoreq.0.3, 0.01.ltoreq.v.ltoreq.0.3, 0.ltoreq.u.ltoreq.0.2, 0.ltoreq.w.ltoreq.0.5, and M is at least one element selected from the group consisting of Al, Ti, V, Cr, Mn, Zr, Hf, Nb, Ta, Mo, Ge, Sb, Sn, Bi, Ni, W, Cu, and Ag.

REFERENCES:
patent: 4402770 (1983-09-01), Koon
patent: 4533408 (1985-08-01), Koon
patent: 4558077 (1985-12-01), Gray
patent: 4721538 (1988-01-01), Narasimhan et al.

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