Preparation of magnetostrictive material

Details Preparation of magnetostrictive material Preparation of magnetostrictive material

1995-04-18

1996-06-25

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Consolidation of powder prior to sintering

419 32, 419 39, 419 46, B22F 300

Patent

active

055297455

ABSTRACT:
By compacting in a magnetic field a mixture containing powder raw material A having a composition represented by (Tb.sub.x Dy.sub.1-x)T.sub.y wherein T is at least one metal of Fe, Co, and Ni and 0.30<x.ltoreq.x 0.50 and 1.70.ltoreq.y.ltoreq.2.00, powder raw material B having a composition represented by (Dy.sub.1-t Tb.sub.t).sub.z T.sub.1-z wherein 0.ltoreq.t.ltoreq.0.30 and 0.40.ltoreq.z.ltoreq.0.80 and optionally, powder raw material C consisting essentially of element T, and sintering the compact, there is prepared a magnetostrictive material having a composition represented by (Tb.sub.v Dy.sub.1-v)T.sub.w wherein 0.27.ltoreq.v<0.50 and 1.70.ltoreq.w.ltoreq.2.00, with grains oriented along [111] axis. The material having minimal crystalline magnetic anisotropy at room temperature and large magnetostrains is obtained at low cost by powder metallurgy.

REFERENCES:
patent: 4152178 (1979-05-01), Malekzadeh et al.
patent: 5275688 (1994-01-01), Mori et al.
patent: 5357232 (1994-10-01), Suzuki et al.
patent: 5405455 (1995-04-01), Kusunoki et al.
Zeitschrift Fur Physikaliische Chemie, Bd. 183, S. 427-435, pp. 1479-1487, 1994, L. Ruiz De Angulo, et al., "Powder Metallurgical Processing of Tb0.27Dy0.73Fe2-x(0.5.gtoreq.x.gtoreq.0.1) From Fine Hydride Powder".

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