Improvement of in-flight alumina spheroidization process using a small power argon DC-RF hybrid plasma flow system by helium mixture

Hidemasa Takana, Juyong Jang, Junji Igawa, Tomoki Nakajima, Oleg P. Solonenko, Hideya Nishiyama

Research output: Contribution to journalReview articlepeer-review

13 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)432-439
Number of pages8
JournalJournal of Thermal Spray Technology
Volume20
Issue number3
DOIs
Publication statusPublished - 2011 Mar

Keywords

  • Ar-He plasma
  • DC-RF hybrid thermal plasma flow
  • alumina powder in-flight process
  • flow control
  • spheroidization

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Materials Chemistry

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