Process for preparing magnetic iron oxide and magnetic iron oxid

Details Process for preparing magnetic iron oxide and magnetic iron oxid Process for preparing magnetic iron oxide and magnetic iron oxid

1975-06-12

1980-04-29

Pianalto, Bernard D.

Stock material or miscellaneous articles

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

Particulate matter

427 48, 427128, 427215, 427217, 427377, 4273833, 428900, H01F 1002

Patent

active

042006805

ABSTRACT:
A magnetic iron oxide having a large coercive force and an improved squareness ratio prepared by coating the surface of needle-like particles of magnetic iron oxide with a cobalt compound, placing the coated iron oxide particles in a unidirectionally oriented magnetic field thereby orienting the particles in the direction of the magnetic field, and heat-treating the needle-like particles in this state with the application of an external magnetic field, or heat-treating the needle-like particles in a magnetized state.

REFERENCES:
patent: 3573980 (1971-04-01), Haller et al.
patent: 3770500 (1973-11-01), Imaoka et al.

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