Process for producing ferrite powder for ferrite magnets

Details Process for producing ferrite powder for ferrite magnets Process for producing ferrite powder for ferrite magnets

1990-11-28

1991-10-01

Willis, Jr., Prince

Compositions

Magnetic

Iron-oxygen compound containing

252 6259, 252 6263, C04B 3526, C04B 3564

Patent

active

050531565

ABSTRACT:
A process for producing ferrite powder for high performance ferrite magnets is claimed, which comprises: milling magnetite or mill scale into a powder comprising particles of specified particle size; oxidizing the milled product to obtain a powder containing 98.0% or higher Fe.sub.2 O.sub.3 ; further adding thereto iron oxide originated from iron chloride or iron sulfide together with an oxide or a carbonate of Sr or Ba; and calcining the resulting powder mixture.
The present invention provides a low-cost process for producing ferrite powder for ferrite magnets having high pellet strength as well as high magnetic properties, from which a high performance Sr-ferrite magnet as well as Ba-ferrite magnet suitable for use in automobile motors can be readily produced by simply molding the powder under a magnetic field and sintering.

REFERENCES:
patent: 3887478 (1975-06-01), Eadie

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