Neodymium iron boron magnets in a hot consolidation process of m

Details Neodymium iron boron magnets in a hot consolidation process of m Neodymium iron boron magnets in a hot consolidation process of m

1988-07-21

1990-08-21

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

419 12, 419 23, 419 48, 419 60, 148101, 148105, 148121, 148130, 75244, 75245, B22F 100

Patent

active

049504509

ABSTRACT:
A method of making high energy Nd-Fe-B magnets having a mass less than 30 grams wherein an alloy of said materials having a grain size less than that desired in the finished magnet is first prepared and subsequently hot worked to the desired configuration with increased magnetic properties and density by introducing into a cavity formed by a die and punch a Nd-Fe-B alloy powder having a particle size of from 45 .mu.m to 250 .mu.m and a grain size of from 100 to 1500 angstroms, compressing the powder at a temperature of from about 550.degree. C. to 750.degree. C. under a die-punch pressure of at least 10 kpsi under a vacuum of less than 200 millitorr to achieve a permanent magnet having a remanence of at least 7 kilogauss.

REFERENCES:
patent: 4144060 (1979-03-01), Jandeska et al.
patent: 4597938 (1986-07-01), Matsuura et al.
patent: 4710239 (1987-12-01), Lee et al.

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