Method of producing high performance permanent magnets

Details Method of producing high performance permanent magnets Method of producing high performance permanent magnets

1986-04-21

1988-07-19

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 419 12, 419 45, 419 46, H01F 102

Patent

active

RE0327140

ABSTRACT:
A method of producing permanent magnet material for high performance permanent magnets is disclosed in which particles of a master alloy consisting of Fe.sub.2 B having a maximum particle size of 50 microns is admixed with Fe powder and particles of a rare earth capable of combining with Fe and B to form a tetragonal compound of Fe.sub.14 R.sub.2 B type. The admixture is compacted and a magnetic material is formed of the master alloy, Fe powder and [rate] rare earth particles which includes a major phase of at least one intermetallic compound of the Fe-R-B type having a crystal structure of the substantially tetragonal system and while the particle size of the crystal structure is controlled by sintering the compacted admixture at a temperature of about 700.degree. C. to 1000.degree. C. for from a fraction of an hour to 36 hours. The magnetic material is then annealed at a temperature of about 550.degree. C. to 650.degree. C. for a fraction of an hour to 2 hours.

REFERENCES:
patent: 3821035 (1974-06-01), Martin
patent: 4152178 (1979-05-01), Malekzadeh et al.
patent: 4211585 (1980-07-01), Inomata et al.
Chabin et al., (Nd, Sm, Gd)-Fe-B Ternary Systems, Dopov. Akad. Nauk, URSR, Ser. A:Fiz-Mat. Tekh. Nauki, 1979(10), pp. 873-876.

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