Manufacture of ferromagnetic metal particles consisting essentia

Details Manufacture of ferromagnetic metal particles consisting essentia Manufacture of ferromagnetic metal particles consisting essentia

1977-09-29

1979-05-22

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05BA, 148105, 252 6255, 252 6256, 427127, 428900, C22C 104

Patent

active

041557484

ABSTRACT:
A method of preparing acicular ferromagnetic metal particles consisting essentially of iron and suitable for magnetic recording, said particles being modified at the surface with 0.02 to 0.2% by weight of carbon and with 0.5 to 1.9% by weight of phosphorus as phosphate, by reducing a finely divided acicular iron compound, wherein there are deposited on said iron compound, prior to reduction, (a) a hydrolysis-resistant substance selected from the group consisting of oxyacids of phosphorus, their esters and inorganic salts, and (b) a compound selected from the group consisting of aliphatic monobasic, dibasic and tribasic carboxylic acids of from 1 to 6 carbon atoms.

REFERENCES:
patent: 3652334 (1972-03-01), Abeck et al.
patent: 4017303 (1977-04-01), Koester et al.
patent: 4050962 (1977-09-01), Koester et al.
patent: 4069073 (1978-01-01), Tadokoro et al.

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