Improvement of In-Flight Alumina Spheroidization Process Using a Small Power Argon DC-RF Hybrid Plasma Flow System by Helium Mixture |
| |
Authors: | Hidemasa Takana Juyong Jang Junji Igawa Tomoki Nakajima Oleg P Solonenko Hideya Nishiyama |
| |
Affiliation: | (1) Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;(2) Graduate School of Engineering, Tohoku University, Sendai, Japan;(3) Khristianovich Institute of Theoretical and Applied Mechanics, SB RAS, Novosibirsk, Russia |
| |
Abstract: | For the further improvement of in-flight alumina spheroidization process with a low-power direct-current radiofrequency (DC-RF)
hybrid plasma flow system, the effect of a small amount of helium gas mixture in argon main gas and also the effect of increasing
DC nozzle diameter on powder spheroidization ratio have been experimentally clarified with correlating helium gas mixture
percentage, plasma enthalpy, powder in-flight velocity, and temperature. The alumina spheroidization ratio increases by helium
gas mixture as a result of enhancement of plasma enthalpy. The highest spheroidization ratio is obtained by 4% mixture of
helium in central gas with enlarging nozzle diameter from 3 to 4 mm, even under the constant low input electric power given
to a DC-RF hybrid plasma flow system. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|