Preparation of Fine Metal Particles by the Gas Evaporation Method with Plasma Jet Flame

Abstract

Fine particles prepared by means of evaporation in inert gas have been expected to show various interesting physical or chemical properties, By the conventional method of heating by tungsten wire, only ten milligrams of particles were produced in one cycle of evaporation. In the present experiment a plasma jet flame with helium gas is used for heating and a gram of particles were produced in five minutes continuously. The produced particles of Fe-Co-Ni alloy are examined by electron-microscope and a X-ray diffractometer. The crystal structure, oxidation, lattice imperfection and sizes of the particles are discussed.