Making magnetic powders

Details Making magnetic powders Making magnetic powders

1979-12-03

1983-07-19

Dixon, Jr., William R.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

148105, 148108, 428900, C22C 104, H01F 102

Patent

active

043941605

ABSTRACT:
Magnetic powders for use in the manufacture of magnetic recording media are produced by a borohydride process in which aqueous solutions of ferrous sulfate and sodium borohydride are mixed in a magnetic field. The coercive force of the magnetic powder produced as a result of this method is controlled by controlling the temperature of the reactant solutions prior to mixing thereof.

REFERENCES:
patent: 3966510 (1976-06-01), Aonuma et al.
patent: 3986901 (1976-10-01), Plante et al.
patent: 4020236 (1977-04-01), Aonuma et al.
patent: 4096316 (1978-06-01), Tamai et al.

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