THEORY, PREPARATION TECHNOLOGY, AND PROPERTIES OF POWDERS AND FIBERS EFFECT OF HEAT-TREATMENT ON THE PROPERTIES, STRUCTURE, AND MAGNETIC-PROPERTIES OF IRON-NICKEL ALLOYS WITH MICRON PARTICLE-SIZE

A method is suggested for producing very fine iron-nickel alloy powder by electrolysis in a two-layer electrolytic bath using a hydrocarbon solvent from an oil refining fraction as an upper organic layer with e vaporation at 180 degrees C and subsequent reduction annealing in a hy drogen atmosphere. The reduction annealing temperature has been studie d for its effect on composition, structure, and magnetic properties of micron size powders. Results of studying the phase and chemical compo sition of powders and their particle shape are provided. These studies make it possible establish the optimum heat treatment conditions in t he production of very fine iron-nickel alloy powders whose chemical co mposition is similar to those produced by the carbonyl method.