Die-upset manufacture to produce high volume fractions of RE-Fe-

Details Die-upset manufacture to produce high volume fractions of RE-Fe- Die-upset manufacture to produce high volume fractions of RE-Fe-

1988-03-24

1989-08-22

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

75244, 419 12, 419 10, 419 66, 252 6255, G22F 100

Patent

active

048594105

ABSTRACT:
A method to increase the volume fraction of magnetically aligned material in rare earth (RE), iron, boron type anisotropic permanently magnetic material includes forming an adaptively shaped fully dense substantially magnetically isotropic preform from relatively coarse powder particles of melt spun alloy with a very fine grain Re.sub.2 Fe.sub.14 B phase. The preform is heated and die upset to provide uniformity of strain in the perform as it is conformed to the die thereby to cause an increased percentage of the crystallites to be oriented along a crystallographically preferred magnetic axis which increases the energy product of a resultant magnet.

REFERENCES:
patent: 4710239 (1987-12-01), Lee et al.
patent: 4765848 (1988-08-01), Mohri et al.
patent: 4780226 (1988-10-01), Sheets et al.

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