Particles containing iron carbide

Details Particles containing iron carbide Particles containing iron carbide

1993-10-12

1995-08-01

Bell, Mark L.

Compositions

Magnetic

Chromium or chromium compound containing

423633, C01B 3130

Patent

active

054378052

ABSTRACT:
The present invention provides acicular particles (A) containing an iron carbide, which have (a) a free carbon content of at most 20 wt. %, and (b) and Fe.sub.5 C.sub.2 ratio(x) of at least 70% and a coercive force of 3.times.+300 to 7.times.+270 Oe, the ratio(x) being expressed by ##EQU1## where S1 is the X-ray diffraction strength of Fe.sub.5 C.sub.2, and S2 is the X-ray diffraction strength of Fe.sub.3 O.sub.4.
The invention further provides particles (B) containing nickel and an iron carbide.
The invention further provides acicular particles containing an iron carbide which are obtained by heating an aqueous dispersion of ferric hydroxide in an alkaline system in the presence of a water-soluble compound capable of coordinating to iron to obtain acicular .alpha.-ferric oxide and contacting the product with a carbon-containing reducing-and-carburizing agent or with a mixture of the agent and a carbon-free reducing agent, with or without contacting the product with the carbon-free reducing agent.
These particles (A) and (C) are controllable in coercive force and usable for magnetic record media of various standards.

REFERENCES:
patent: 4414196 (1983-11-01), Matsumoto et al.
patent: 4668414 (1987-05-01), Okamura et al.

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