Effect of Addition Agents on the Properties of Nickel Powders Produced by Hydrogen Reduction

  • W. Kunda
  • D. J. I. Evans
  • V. N. Mackiw


The functions of the many additives which have been used in the hydrogen reduction of metals from aqueous systems are reviewed with particular emphasis on their effect on the physical properties of the metal powders produced. The effects of a number of these additives on the product characteristics and on the mechanism involved in the reduction of nickel from its aqueous ammine-ammonium carbonate system were determined. Since the composition of the reduction feed also affects the reduction behavior, three widely different feed compositions were used. Electron microscopy revealed that a specific additive, when it did exert an influence, affected either the nucleation or the growth of the metallic nickel particles, but not both. A mechanism for the reduction is postulated, and the effects of the additives on this mechanism are enumerated to account for the physical properties of the powders produced. The dependence on the Fisher number (and, thus, on the surface area) of the minimum temperature required to sinter the powders to a given strength plaque was demonstrated.


Addition Agent Hydrogen Reduction Feed Composition Nickel Powder Sodium Lauryl Ether Sulfate 
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Copyright information

© Metal Powder Industries Federation and The Metallurgical Society of AIME 1966

Authors and Affiliations

  • W. Kunda
    • 1
  • D. J. I. Evans
    • 1
  • V. N. Mackiw
    • 1
  1. 1.Research and Development DivisionSherritt Gordon Mines LimitedFort SaskatchewanCanada

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