Manufacture of cobalt-modified .gamma.-iron(III)oxides

Details Manufacture of cobalt-modified .gamma.-iron(III)oxides Manufacture of cobalt-modified .gamma.-iron(III)oxides

1976-02-10

1977-12-20

Pianalto, Bernard D.

Coating processes

Magnetic base or coating

Magnetic coating

427127, 427128, H01F 1002

Patent

active

040642925

ABSTRACT:
The invention relates to the manufacture of acicular cobalt-modified .gamma.-iron(III) oxide by coating an acicular .alpha.-iron(III) oxide or its hydrate with an inorganic protective coating, subsequent reduction to magnetite at 350.degree. to 650.degree. C, application of the cobalt compound to this magnetite or to the .gamma.-iron(III) oxide obtained therefrom by oxidation, and subsequent heat treatment at 80.degree. to 300.degree. C, if necessary with simultaneous oxidation of the magnetite to the corresponding .gamma.-iron(III) oxide. This iron oxide has high coercivity and can be used as the magnetic component in magnetic recording media for recording high frequencies without having the disadvantage of thermal and mechanical instability.

REFERENCES:
patent: 3770500 (1973-11-01), Imaoka et al.

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