Process for producing magnetic metal powder and coating for magn

Details Process for producing magnetic metal powder and coating for magn Process for producing magnetic metal powder and coating for magn

1991-03-26

1993-02-09

Willis, Jr., Prince

Compositions

Magnetic

Chromium or chromium compound containing

75349, 427127, 427217, 427377, 148105, H01F 106

Patent

active

051850931

ABSTRACT:
A magnetic metal powder, having a large specific surface are, a high coercive force, a high dispersibility and an excellent corrosion resistance, is produced by converting an aciculate goethite having a silicon and/or aluminum compound layer formed thereon or an aciculate goethite modified with a metal other than iron into magnetite, forming thereon a nonferrous transition metal compound layer, further forming thereon a silicon or aluminum compound layer, and reducing the coated magnetite to prepare a magnetic metal powder mainly composed of iron and having on the surface thereof a layer containing a nonferrous transition metal element, characterized in that the formation of the silicon and/or aluminum compound layer on the aciculate goethite and/or the formation of the nonferrous transition metal layer on the magnetite are conducted while conducting dispersion by means of a disperser.

REFERENCES:
patent: 4390361 (1983-06-01), Sueyoshi
patent: 4456475 (1984-06-01), Hirai
patent: 4576635 (1986-03-01), Araki
patent: 4729785 (1988-03-01), Schwab
patent: 4900590 (1990-02-01), Ritsko
patent: 5028278 (1991-07-01), Kadono
patent: 5076836 (1991-12-01), Hisaoka

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