Abstract
The principles involved in producing metal powders by hydrogen reduction of metal ions in aqueous solutions are discussed from the thermo-dynamic and the kinetic standpoint. The influence of nuclei and of surface-active agents on the nature of the powders are considered in relation to the production of nickel, cobalt, and copper.
A survey is made of the scale and technology of current processes and the uses to which metal powders may be put are described, with particular reference to the manufacture of metal strip and plates, dispersion-hardened nickel, and composites.
The practicability of controlling the conditions of reduction to yield powders with widely varying combinations of properties is a most valuable attribute of hydrometallurgical methods.
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