Process of producing calcined materials for ferrite magnet

Details Process of producing calcined materials for ferrite magnet Process of producing calcined materials for ferrite magnet

1994-03-30

1995-02-07

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 6259, 252 6263, 423594, C04B 3526

Patent

active

053873564

ABSTRACT:
It is an object of the present invention to provide a process of producing calcined materials for ferrite magnet, whereby foreign phase produced in calcined powders is eliminated and the ferrite magnet having a superior magnetic properties is obtained easily. Since mill scales roughly milled into a mean particle size of 20 .mu.m or less is subjected to primary oxidation treatment to change its oxidation percentage 95% or higher, and oxidized completely by secondary oxidation treatment in an inclined rotary kiln up to 700.degree. C. in an atmosphere containing O.sub.2 content of 8% to 10% at a charging side of raw material, foreign phase is not produced in the calcined powders during ferrite formation at high temperatures, and the ferrite magnet having a superior magnetic properties can be obtained.

REFERENCES:
patent: 5053156 (1991-10-01), Okumori et al.
patent: 5061412 (1991-10-01), Okumori et al.

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