Micron-sized nickel metal powder and a process for the preparati

Details Micron-sized nickel metal powder and a process for the preparati Micron-sized nickel metal powder and a process for the preparati

1994-11-14

1996-12-17

Sheehan, John

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

75348, B22F 100

Patent

active

055849083

ABSTRACT:
A process is provided for the production of a nickel metal powder by reduction of an ammoniacal nickel (II) carbonate solution essentially free of metallic nickel. A soluble silver salt is added in an amount to provide a soluble silver to nickel weight ratio of 1.0 to 10.0 grams per kilogram of nickel, an organic dispersant, such as gelatin, is added in the amount of 5.0 to 20.0 grams per kilogram of nickel Ni (II), together with a spheroid-promoting agent such as anthraquinone in an amount of about 1.0 to 5.0 grams per kilogram of nickel. The solution is heated to a temperature in the range of 150.degree. to 180.degree. C., with agitation, under a hydrogen pressure of about 3.5 MPa for a time sufficient to reduce the ammoniacal ammonium nickel (II) carbonate solution to micron-sized nickel metal powder. A high purity, micron-sized nickel metal powder of generally spheroid particulate configuration is produced. The nickel metal powder has an average particle size of about 0.5 microns. The metal powder is characterized in having an iron impurity content of less than 100 ppm.

REFERENCES:
patent: 3156556 (1964-11-01), Meddings et al.
patent: 3399050 (1968-08-01), Evans et al.
"Effect of Addition Agents on the Properties of Nickel Powders Produced by Hydrogen Reduction" By W. Kunda, D. J. I Evans and V. N. Mackiw Date-1965 Full copy.

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