Process for producing magnetic iron oxide particles for magnetic

Details Process for producing magnetic iron oxide particles for magnetic Process for producing magnetic iron oxide particles for magnetic

1989-11-28

1991-08-20

Pianalto, Bernard

Coating processes

Magnetic base or coating

252 6256, 427314, 427331, 4274432, B05D 512

Patent

active

050413074

ABSTRACT:
A process for producing magnetic ion oxide particles for magnetic rcording which comprises heat-treating a magnetic iron oxide particles of magnetite, berthollide or maghemite as a starting materials, in the presence of a zinc component or both a zinc component and a silicon component at a temperature of 400.degree. to 700.degree. C. in a specific atmosphere, and if necessary, subjecting the heat-treated particles to wet treatment and/or dry treatment, thereby doping the particles with zinc ions resulting in magnetic iron oxide particles having an improved saturation magnetization, a proportion of said zinc ions being 2 to 9 at. % by weight relative to the total amount of iron ions.

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