Method for the manufacture of an anisotropic magnet material on

Details Method for the manufacture of an anisotropic magnet material on Method for the manufacture of an anisotropic magnet material on

1988-03-18

1989-08-08

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 148108, 164463, 164477, H01F 4102

Patent

active

048549797

ABSTRACT:
An anisotropic magnetic material formed from iron, boron and a rare-earth metal is prepared by the rapid solidification of an alloy melt of the desired composition and subsequently treated to generate magnetic anisotropy. The materials attain comparatively higher coercivity field strengths. A preliminary alloy is first prepared with the material components and cobalt is added to the alloy in such an amount that the crystallization temperature of the corresponding amorphous material system is below the Curie temperature of the crystallizing SE.sub.2 (Fe, Co).sub.14 B- phase. An intermediate product with amorphous structure is then developed from the melt of the preliminary alloy using a rapid solidification technique. Thereafter, a crystallization of the intermediate product is performed using a heat treatment at a temperature that is above the crystallization temperature but below the Curie Temperature in the presence of an external d-c magnetic field to generate the magnetic anisotropy. The particles involved can be aligned and mechanically fixed after the crystallization.

REFERENCES:
patent: 4402770 (1983-09-01), Koon
Croat, J. J., Research Publication GMR-4080, "Permanent Magnet Properties of Rapidly Quenched Rare-Earth Iron Alloys", Jul. 1982.
Becker, J. "Rapidly Quenched Metals for Permanent Magnet Materials", Journal of Applied Physics, 55(6), Mar. 15, 1984.
European Search Report RS-78009 DE.
Thermal Effects of Moderate Substitutions of Cobalt for Iron in Fe.sub.76 PR.sub.16 B.sub.8, 320 Applied Physics Letters No. 9 (May, 1984).
Hot-Pressed Neodymium-Iron-Boron Magnets, Applied Physics Letters, vol. 96, No. 3 (Apr. 15, 1985).
Magnet Properties of the Nd.sub.2 (Fe.sub.1x Co.sub.x).sub.14 System Applied Physics Letters, vol. 96, No. 3 (Feb. 1, 1985).
Spin Reorientations in R.sub.2 FE.sub.14-x Co.sub.x B Systems (R=Pr, Nd and Er) Journal of Magnetism and Magnetic Materials, 65 (1987) 139-144.
Zeitschrift fuer metallkunde, vol. 69, No. 4, (1978) (German).

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