Process for producing ultrafine metal powder

Details Process for producing ultrafine metal powder Process for producing ultrafine metal powder

1988-04-21

1989-02-28

Stallard, Wayland

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05AA, 75 05AB, 75251, B22F 930

Patent

active

048082163

ABSTRACT:
In a process for producing an ultrafine powder of a metal by subjecting a transition metal carbonyl compound to gas phase pyrolysis reaction, the improvement which comprises diluting said carbonyl compound with an inert gas or hydrogen to a concentration of 3 vol. % or less with optional addition of an oxygen-containing organic compound and/or a sulfur-containing organic compound in an amount of 0.0001 to 0.1 mol per mol of said carbonyl compound to prepare a gas mixture, and then carrying out gas phase pyrolysis reaction at 300.degree. C. or higher by allowing said gas mixture to reside for 5 seconds or less in a reaction system to which a magnetic field of 100 gauss or higher is being applied, thereby obtaining the ultrafine powder of said metal having a length of 1 micron or less, a coercive force of 800 oersted or higher and a saturation magnetization of 120 emu/g or higher.

REFERENCES:
patent: 2884319 (1959-04-01), Fabian et al.
patent: 2983997 (1961-05-01), Schmeckenbecher
patent: 3172776 (1965-03-01), Manly, Jr.
patent: 3200007 (1965-08-01), Flowers
patent: 3228882 (1966-01-01), Harle et al.

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