Process for producing a rare earth-iron-boron magnet

Details Process for producing a rare earth-iron-boron magnet Process for producing a rare earth-iron-boron magnet

1991-03-27

1992-12-01

Silbaugh, Jan H.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

148101, 148302, 264 27, 264125, 264332, 264DIG58, 419 52, B29C 4302, B29C 6702

Patent

active

051679159

ABSTRACT:
A process for producing a rare earth-iron-boron magnet, which includes the steps of: (1) charging a melt spun powder of a rare earth-iron-boron magnet into at least one cavity, which is confined by a pair of electrodes inserted into a hole of an electrically non-conductive ceramic die; (2) subjecting the melt spun powder to a non-equilibrium plasma treatment, under a reduced atmosphere of 10.sup.-1 to 10.sup.-3 Torr, while applying a uniaxial pressure of 200 to 500 kgf/cm.sup.2 to the melt spun powder in the direction connecting the electrodes interposed between a pair of thermally insulating members, thereby fusing the melt spun powder; and (3) heating the fused melt spun powder to a temperature higher than or equal to its crystallization temperature by transferring a Joule's heat generated in the thermally insulating members by passing a current through the members to the melt spun powder thereby causing the plastic deformation of the melt spun powder to form a rare earth-iron-boron magnet.

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patent: 3567903 (1971-03-01), Parker
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patent: 4881985 (1989-11-01), Brewer et al.
patent: 4921553 (1990-05-01), Tokunga
patent: 4929415 (1990-05-01), Okazaki
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IEEE Transactions on Magnetics, vol. 26, No. 5, Sep. 1990, New York US pp. 2601-2603; M. Wade et al., "New Method of making Nd-Fe-Co-B Full Dense Magnet".
Search Report for EPO application No. EP-91302848.6 dated Jun. 21, 1991.

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