Reduction annealing of very fine electrolytic iron powders with organic coatings

Abstract

Very fine iron powders produced by electrolysis in a two-layer bath are not suitable in the as-deposited condition for the manufacture of micropowder magnets. Heat treatment for 4 h in very dry hydrogen at a temperature of 600°K removes the excess of the organic component, reduces surface oxides, and brings about structural changes which impart to such powders an optimum particle shape and good compressibility. This enables micropowder magnets of excellent properties to be obtained.