Patent ID: 7381363

Claim:
A plasma processing appararatus for powder, comprising a powder supply nozzle to supply a powder material into plasma flame generated inside a high-frequency coil, wherein the powder supply nozzle is arranged substantially radially centrally of the high-frequency coil so as to be inserted in the plasma flame, and comprises a revolving flow forming device to cause a carrier gas and the powder material to form therein a revolving flow with an axis thereof directed axially of the high-frequency coil, and the revolving flow is discharged from an outlet at an end of the nozzle, wherein the powder supply nozzle is cylindrical-shaped and has a longitudinal axis, and wherein the revolving flow forming device comprises a longitudinally extending spiral-shaped flow passage which is arranged in the powder supply nozzle, and which has a longitudinal axis corresponding to the longitudinal axis of the nozzle.