Hard magnetic material

Details Hard magnetic material Hard magnetic material

1974-02-07

1976-03-30

Satterfield, Walter R.

Metal treatment

Compositions

Heat treating

75152, 148101, 148103, H01F 104

Patent

active

039472957

ABSTRACT:
Bulk hardened magnetic materials with compositions expressed by a general formula Sm.sub.u Ce.sub.1.sub.-u (Co.sub.1.sub.-x.sub.-y Fe.sub.x Cu.sub.y).sub.z are provided. Compositions in the limited range of 0.3.ltoreq.u.ltoreq.1.0, 0.ltoreq.x.ltoreq.0.1, 0.09.ltoreq.y.ltoreq.0.18, 6.0.ltoreq.z.ltoreq.7.5 lead to magnetic materials with unexpectedly large maximum energy product and with a newly found two phase structure. Magnetic materials with maximum energy product of over 13 MG.sup.. Oe (megagauss) oersted), residual induction over 7000 G and intrinsic coercive force over 3000 Oe are obtained by subjecting the compositions to a sintering process.

REFERENCES:
patent: 3540945 (1970-11-01), Strnat et al.
patent: 3546030 (1970-12-01), Buschow et al.
patent: 3560200 (1971-02-01), Nesbitt et al.
patent: 3790414 (1974-02-01), Tawara et al.
Nesbitt, E; New Perm. Mag. Materials Cont. Rare-Earth Metals, in Journ. Appl. Phys., 40, Mar. 1969, pp. 1259-1262.
Nesbitt, et al.; Cast Perm. Mag.--Co.sub.5 Re Type with Mixtures of Ce and Sm; in Journ. Appl. Phys., 42, Mar. 1971, pp. 1530-1532.
Nesbitt, et al.; Perm. Mag. Materials, in Applied Physics Letters, June, 1968, pp. 861-862.
Strnat, K., et al.; Mag. Prop. of Rare-Earth-Iron Intermet. Com.; in IEEE Trans. Mag. 1966, pp. 489-493.

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