Manufacture of acicular ferromagnetic iron particles

Details Manufacture of acicular ferromagnetic iron particles Manufacture of acicular ferromagnetic iron particles

1980-07-31

1982-08-17

Cooper, Jack

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

148105, 252 6255, 427127, 427216, C22B 512, C22C 104

Patent

active

043447910

ABSTRACT:
A process for the manufacture of acicular ferromagnetic iron particles by heating a goethite, provided with a shape-stabilizing surface coating, at 250.degree.-450.degree. C. in an atmosphere containing water vapor at a partial pressure of not less than 30 mbar, to give alpha-iron(III) oxide, and reducing this material with hydrogen at 275.degree.-425.degree. C., and the use of the iron particles thus obtained as magnetic material in the production of magnetic recording media.

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patent: 4061726 (1977-12-01), Ohlinger et al.
patent: 4061727 (1977-12-01), Vaeth et al.
patent: 4155748 (1979-05-01), Steck et al.
patent: 4178171 (1979-12-01), Steck et al.

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