Magnetic powder for magnetic recording media and method for prod

Details Magnetic powder for magnetic recording media and method for prod Magnetic powder for magnetic recording media and method for prod

1990-10-15

1992-09-29

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

75369, 148105, B22F 102

Patent

active

051511150

ABSTRACT:
A metal magnetic powder for magnetic recording media consisting essentially of iron is obtained by providing a hydrous needle-like iron oxide powder as a starting material, applying cobalt ions on the surface thereof, and subsequently reducing the resultant powder in a reducing atmosphere. The metal magnetic powder contains cobalt in an amount not less than 6 weight % relative to iron, and the coercive force of the powder is not more than 1600 Oe.

REFERENCES:
patent: 4133677 (1979-01-01), Matsui et al.
patent: 4447264 (1984-05-01), Suzuki et al.
patent: 4576635 (1986-03-01), Araki et al.
patent: 5039553 (1971-08-01), Fukumoto et al.

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