Rare earth-containing permanent magnets

Details Rare earth-containing permanent magnets Rare earth-containing permanent magnets

1975-02-20

1976-09-28

Satterfield, Walter R.

Metal treatment

Compositions

Heat treating

148101, 148103, 148105, 148102, 75152, H01F 104

Patent

active

039829715

ABSTRACT:
Permanent magnets are disclosed having a very high coercive force and a very great maximum energy product, and consisting essentially of a rare earth-cobalt based alloy. The alloy is expressed by the formula Sm.sub.1.sub.-u Ce.sub.u (Co.sub.1.sub.-v.sub.-w.sub.-x Cu.sub.v Fe.sub.w Mn.sub.x).sub.z where 0.ltoreq.u.ltoreq.0.20, 0.08.ltoreq.v.ltoreq.0.20, 0.ltoreq.w.ltoreq.0.08, 0.01.ltoreq.x.ltoreq.0.15 and 6.0.ltoreq.z.ltoreq.7.8, preferably 7.2.ltoreq.z.ltoreq.7.8. By using these alloys, the magnetic properties of the resultant permanent magnets are superiorly affected, and the magnet-preparing process is rendered much simplified. This is also because the conventional heat aging step may be eliminated, particularly when the z value is within the preferred range.

REFERENCES:
patent: 3424578 (1969-01-01), Strnat et al.
patent: 3684593 (1972-08-01), Benz et al.
patent: 3755007 (1973-08-01), Benz et al.
Nesbitt, E.; New Perm. Mag. Mtls. Containing Rare-Metals, in J. Appl. Phys., 40, Mar. 1969 pp. 1259-1265.

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