Process for producing magnetic powder

Details Process for producing magnetic powder Process for producing magnetic powder

1980-11-06

1982-05-25

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

75 05AA, 148108, H01F 102

Patent

active

043314899

ABSTRACT:
A magnetic powder is produced by mixing an aqueous solution of a metal salt with an aqueous solution of a reducing agent such as sodium boron hydride in a magnetic field to reduce said metal salt to continuously form a magnetic powder and heat-treating said magnetic powder in a non-oxidative atmosphere. The aqueous solution of a metal salt is mixed with said aqueous solution of a reducing agent in a magnetic field to continuously discharge a reaction mixture containing a magnetic powder having pH of 2.5 or lower from a reactor and said reaction mixture containing said magnetic powder is immediately continuously washed and filtered and said magnetic powder is heat-treated in said non-oxidative atmosphere.

REFERENCES:
patent: 3756866 (1973-09-01), Parker et al.
patent: 4076861 (1978-02-01), Furukawa et al.
patent: 4096316 (1978-06-01), Tamai et al.
patent: 4113528 (1978-09-01), Tokuoka et al.
patent: 4221614 (1980-09-01), Yoda et al.

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