Method for producing R-Fe-B-based, sintered magnet

Details Method for producing R-Fe-B-based, sintered magnet Method for producing R-Fe-B-based, sintered magnet

1994-01-27

1996-02-06

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148101, 148104, 419 12, 419 30, H01F 1057

Patent

active

054893437

ABSTRACT:
An R-Fe-B-based, sintered magnet, wherein R is one or more of rare earth elements including Y, is produced by the method including the steps of mixing fine R-Fe-B-based magnet powder with a mineral oil and/or a synthetic oil having a fractional distillation temperature range of 150.degree.-400.degree. C. and a kinetic viscosity of 10 cSt or less to prepare a mixture; charging the mixture under pressure into a die cavity equipped with a filter, to which an orientated magnetic field is applied, while removing a mineral oil and/or a synthetic oil from the mixture; compressing the mixture in the die cavity to carry out a wet molding while orientating the powder to prepare a green body; heating the green body to a temperature up to 500.degree. C. at a speed of 10.degree. C./min or less under pressure of 10.sup.-1 Torr or less for 30 minutes or more to remove a mineral oil and/or a synthetic oil from the green body; and then sintering the green body.

REFERENCES:
patent: 3785881 (1974-01-01), Naastepad et al.
patent: 3901742 (1975-08-01), Facacaros
patent: 4911882 (1990-03-01), Greenwald
Noller, "Chemistry of Organic Compounds", 1966 pp. 61, 62, 67 and 464.

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