Manufacture of ferromagnetic metal particles essentially consist

Details Manufacture of ferromagnetic metal particles essentially consist Manufacture of ferromagnetic metal particles essentially consist

1978-09-15

1979-08-21

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

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

Patent

active

041652320

ABSTRACT:
A process for the manufacture of acicular ferromagnetic metal particles which essentially consist of iron and carry, on their surface, from 0.02 to 0.6% by weight of boron in the form of a borate, by reducing an acicular iron oxide with a gaseous reducing agent at from 250.degree. to 500.degree. C., wherein a compound selected from the group comprising boron oxyacids and their inorganic salts is precipitated on the said iron oxide before reduction.

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