Process for preparing iron compound particles for use in magneti

Details Process for preparing iron compound particles for use in magneti Process for preparing iron compound particles for use in magneti

1981-01-30

1982-08-03

Cooper, Jack

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05AA, 148105, 252 6255, 252 6256, 252 6262, 252 6263, C22B 502, H01F 100

Patent

active

043425895

ABSTRACT:
Disclosed is a process for preparing fine needle-like, ferromagnetic iron compound particles for use in magnetic recording in which needle-like iron oxyhydroxide fine particles prepared by simultaneously co-precipitating or cladding iron compound particles with an element of group II of the Periodic Table and manganese at atomic weight ratios of the element of group II of the Periodic Table and manganese to iron of from 0.001/100 to 10/100 and 0.005/100 to 10/100 respectively are reduced and/or oxidized under heating.

REFERENCES:
patent: 3912646 (1975-10-01), Leitner et al.
patent: 4255492 (1981-03-01), Audran et al.
patent: 4259368 (1981-03-01), Rudolf et al.

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