Process for the production of cobalt-containing magnetic iron ox

Details Process for the production of cobalt-containing magnetic iron ox Process for the production of cobalt-containing magnetic iron ox

1982-09-29

1985-02-26

Lusignan, Michael R.

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

75 5AA, 427 48, 427128, 427217, 427299, 428403, 428900, H01F 1002, B05D 700

Patent

active

045017743

ABSTRACT:
A process is provided for coating the particle surfaces of a phosphor-containing magnetic iron oxide powder with a cobalt compound after subjecting said powder to an activation treatment with an aqueous alkaline and/or acidic medium. The cobalt-containing magnetic iron oxide powder obtained according to this process has excellent coercivity and thermal stability, and the magnetic tape produced by using said powder has not only high coercivity but also excellent squareness, orientability and remanent induction.

REFERENCES:
patent: 3770500 (1973-11-01), Imaoka et al.
patent: 4137342 (1979-01-01), Kanten
patent: 4200680 (1980-04-01), Sasazawa et al.

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