Abstract
1. Using the technique of autoclave reduction of a water—ammonia suspension of nickel carbonate, a very fine nickel powder — of ⩽1Μ mean particle size — has been produced, surpassing carbonyl nickel powder in low-temperature sinterability. 2. It is shown that the processes of low-temperature recovery in autoclave and carbonyl nickel powders are similar, and the difference in volume shrinkage exhibited by these powders during sintering is therefore attributable not to structural factors but to their difference in particle size. 3. Very fine autoclave powders are characterized by excellent compactibility and because of this are well suited for the production of high-porosity materials.
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