Process for producing magnetic powder having high coercive force

Details Process for producing magnetic powder having high coercive force Process for producing magnetic powder having high coercive force

1980-04-24

1982-03-23

Cooper, Jack

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

427127, 252 6256, 252 6259, 428693, C01G 4906, C01G 4908

Patent

active

043213022

ABSTRACT:
A magnetic iron oxide powder having high coercive force is produced by dispersing a magnetic iron oxide comprising a silicon component and a phosphorus component in an aqueous solution of a cobalt ion and adding a base to the dispersion to be an alkaline condition and heat-treating the dispersion whereby the cobalt ion is adsorbed and diffused in the surface layer of the magnetic iron oxide. A zinc component can be also incorporated in the crystal. The silicon component and the phosphorus component are preferably incorporated in the crystalline structure.

REFERENCES:
patent: 3931025 (1976-01-01), Woditsch et al.
patent: 4082905 (1978-04-01), Stephan
patent: 4136158 (1979-01-01), Okuda et al.
patent: 4137342 (1979-01-01), Kanten
patent: 4201761 (1980-05-01), Seitzer

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