| 摘要 |
PURPOSE:To efficiently produce pulverous powder having a uniform compsn. by disposing the raw material to be pulverized to the annular state in a furnace, disposing a ring plasma torch thereabove, melting the annular material by a rotary plasma arc and taking out the material as the pulverous particles by the neutral gaseous plasma introduced therein. CONSTITUTION:The raw material to be ground is supplied from a raw material supplying device 32 into a water-cooled anuular crucible 2 and a neutral gas such as H2, Ar or He is supplied therein from a carrier gas supply cylinder 33. The annular plasma arc torch 15 is provided above the crucible 2 and the plasma arc 40 is formed through a nozzle port 22 of the torch 15 to the raw material to be pulverized in an annular raw material reservoir 3 below the torch. The raw material in the crucible 2 is melted and the molten metal 41 is pulverized to the pulverous particles by the neutral gaseous plasma ejected from a supply opening 34 of the cylinder 33. The pulverous particles are taken out of a discharge pipe 9 provided at the center of the crucible 2 toward a pulverous particle capturing device.
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