Manufacture of acicular cobalt-containing magnetic iron oxide

Details Manufacture of acicular cobalt-containing magnetic iron oxide Manufacture of acicular cobalt-containing magnetic iron oxide

1980-01-29

1981-09-01

Cooper, Jack

Coating processes

Magnetic base or coating

252 6256, 427128, 427130, C01G 4906

Patent

active

042872332

ABSTRACT:
A process for the manufacture of acicular magnetic iron oxide consisting of core of gamma-iron(III) oxide and a ferrite shell which contains, based on the total amount of magnetic material, from 0.2 to 12 per cent by weight of cobalt(II) ions and from 0.1 to 15 per cent by weight of iron(II) ions, wherein a precipitate of cobalt(II) hydroxide and iron (II) hydroxide is applied to acicular gamma-iron(III) oxide particles and the latter are heated at 100.degree.-200.degree. C.

REFERENCES:
patent: 3081264 (1963-03-01), Nobuoka et al.
patent: 3117733 (1964-01-01), Cleemann
patent: 3573980 (1971-04-01), Haller et al.
patent: 4188302 (1980-02-01), Becker et al.

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