Process for production of ferromagnetic powder and apparatus the

Details Process for production of ferromagnetic powder and apparatus the Process for production of ferromagnetic powder and apparatus the

1977-04-05

1979-02-27

Stallard, W.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

75 05AA, 75108, H01F 106

Patent

active

041417631

ABSTRACT:
A process for producing a ferromagnetic powder comprising injecting a stream of an aqueous solution of a metal salt capable of forming a ferromagnetic substance and a stream of solution containing a reducing material for mixing into a reaction chamber such that the two solutions impinge upon one another causing an oxidation-reduction reaction between them to occur, and applying a magnetic field of 50 oe or more to the particles produced by the oxidation-reduction reaction for the period during which the particles become ferromagnetic particles after going through a superparamagnetic state and an apparatus for use in the practice of the above process comprising a reaction vessel, at least one nozzle for injecting each of a solution of a metal salt and a solution containing a reducing material into the reaction vessel and a magnet for producing a magnetic field in the reaction vessel with the nozzles being open to the magnetic field and positioned so that the solution of the metal salt and the solution of the reducing material when injected are mixed.

REFERENCES:
patent: 3206338 (1965-09-01), Miller et al.
patent: 3669643 (1972-06-01), Bagley et al.
patent: 3672867 (1972-06-01), Little
patent: 3684484 (1972-08-01), Marchese et al.
patent: 3782706 (1974-01-01), Muhlpfordt

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