| 摘要 |
PURPOSE:To easily spheroidize non-spheroidal base powder of metal or alloy by passing said base powder in a high temp. area, once melting and dropping the same and cooling and solidifying the melt in the course of the dropping. CONSTITUTION:The non-spheroidal metal or alloy powder obtd. by a mechanical pulverizing method or gas atomizing method, etc., is housed into a hopper 4 disposed into an introducing chamber 1a of a vertical type high-temp. tubular furnace 1. The inside of a heating chamber 1b of the above-mentioned tubular furnace 1 is evacuated to a vacuum by a vacuum pump 8 at need and is substd. with gaseous N2, etc. The above-mentioned powder is thereafter dropped from the hopper 4 in the heating tube 2 and is heated to melt by a heater 3. The once melted powder is in succession dropped in the heating chamber 1b and the melted is cooled and solidified in the course of the dropping. The spheroidal metal or alloy powder is recovered in a powder recovering chamber 1c in the bottom. A protective atmosphere gas is preferably introduced under pressurization from a gas introducing pipe 5 into the chamber 1a to apply the velocity of the flow falling by overcoming the ascending gaseous flow generated in the tube 2 to the powder passing in said tube.
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