Magnetic powder for magnetic recording medium

Details Magnetic powder for magnetic recording medium Magnetic powder for magnetic recording medium

1980-07-30

1982-03-23

Cooper, Jack

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

252 6256, 252 6259, 252 6255, 427127, 427130, 427131, 428692, C01G 4908

Patent

active

043213030

ABSTRACT:
A magnetic powder for a magnetic recording medium is obtained by forming a silica layer on a surface of an acicular iron oxide fine powder as a core by treating it with a silicon compound before preparing a cobalt modified acicular iron oxide fine powder by dispersing said acicular iron oxide fine powder as the core in an aqueous solution of ammonia containing cobalt ion and treating it in an inert gas atmosphere at high temperature or in a reduction atmosphere.

REFERENCES:
patent: 3725126 (1973-04-01), Haller et al.
patent: 3947502 (1976-03-01), Leitner et al.
patent: 4064292 (1977-12-01), Schoenafmyer et al.
patent: 4071610 (1978-01-01), Koester et al.
patent: 4137342 (1979-01-01), Kanten

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