NICKEL FINE POWDER AND METHOD OF MANUFACTURING THE SAME

摘要

An aim of the invention is to provide a nickel micro powder which is spherical and has excellent crystallinity and oversize particle mixing ratio that is greatly reduced than that of the prior-art product. The manufacturing method of the nickel micro powder comprises the following steps: raw material preparing step of preparing a nickel raw material through a mode that the sulfur content is 0.1-0.5% by mass; a micronizing step of gasifying the nickel raw material through hot plasma in a reducing gas environment for condensing the nickel steam and micronizing; an oversize particle removing step of continuously guiding the obtained micronized nickel into a water cooling jacket type cyclone separator for removing the oversize particles and cooling the micronized nickel; a recycling step of recycling the micronized nickel; and a slow oxidizing step of keeping the recycled micronized nickel in a weak oxidative non-active gas environment so the surface of the micronized nickel is slowly oxidized for obtaining the nickel micro powder.