| 摘要 |
PURPOSE:To reduce metallic powder which is less oxidized and has an excellent grain size distribution and particle shape by blowing an inert gas in the form of liquid to the molten metal flowing in an inert atmosphere at a specific ratio and recovering the molten metal in the powder state. CONSTITUTION:The molten metal 2 contained in a melting furnace 1 is dropped through the central hole of an atomizer nozzle 3 into an atomizing tank 4. The molten metal is pulverized by the jet 5 of a liquid gas (>=one kind among liquid nitrogen, liquid argon and liquid helium) ejected from the same nozzle 3 in the mid-way of said dropping. The weight ratio of the liquid gas with respect to the metal 2 is made >=0.3%. The pulverized particles are quickly cooled and solidified and dropped into a cooling medium 6 (water, oil, etc.) in the tank 4. The liquefied gas is separated from the powder by a solid-liquid separator 7 after cooling and the powder is contained in a product tank 8. The metallic powder contg. less impurities is thus obtd.
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