Abstract
Ultra fine metal powders of less than 0.1 µm in diameter can be produced in Ar, He or He+H2 gaseous atmosphere by using the gas evaporation method with several heating methods. Three heating methods, that is, plasma jet, open arc and high frequency induction, have been tested to heat the surface of molten metal and alloy by the authors for producing ultra fine powders. Operating conditions of the ultra fine metal powder apparatus, the relation between the mean particle size of ultra fine Ni powder and the operating condition of the plasma jet, the similar data for ultra-fine Cu powder produced by an induction heating method and magnetic properties of ferromagnetic material powders are described.
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