Abstract
The purpose of this paper is to clarify experimentally the effects of helium gas addition into argon gas and DC plasma jet on the in-flight alumina spheroidization process using DC-RE hybrid plasma flow system under a small input power. Spheroidization ratio is evaluated through SEM image analysis relating to added helium gas flow rate, plasma enthalpy, and also particle velocity and particle temperature. Spheroidization ratio increases through enhanced heat exchange between Ar/He plasma and particles, and also through decrease in DC jet velocity. Spheroidization ratio of 82.7% is obtained with as small as 4% of helium addition into argon central gas.
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