Process for producing magnetic metal powder for magnetic recordi

Details Process for producing magnetic metal powder for magnetic recordi Process for producing magnetic metal powder for magnetic recordi

1990-12-20

1992-09-01

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

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

148105, B22F 922

Patent

active

051435420

ABSTRACT:
The present invention provides a process for producing magnetic metal powder for magnetic recording using a metal compound mainly composed of a hydrous iron oxide on an iron oxide, characterized in that prior to subjecting the metal compound mainly composed of a hydrous iron oxide or an iron oxide to a reduction treatment, addition of a boron compound and a heat treatment at 350.degree.-750.degree. C. in a gas atmosphere having a water vapor partial pressure of 10 mmHg or higher are carried out. When a heat treatment at 550.degree.-900.degree. C. in a non-reducing atmosphere is carried out in combination with the above heat treatment, the effect of the present invention is further increased.

REFERENCES:
patent: 4165232 (1979-08-01), Jaeckh et al.
patent: 4344791 (1982-08-01), Steck et al.

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