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Induction Thermal Plasma (induction + thermal_plasma)

Distribution by Scientific Domains
Engineering57%

Selected Abstracts

In-Flight-Melted Soda-Lime-Silica Glass by RF Induction Thermal Plasma

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 12 2008
Fuji Funabiki
Granulated raw materials with a particle size of 20,80 ,m were prepared from a slurry of Na2CO3, CaCO3, and SiO2 (quartz) by the spray-dry method, and injected with carrier gas into a radio-frequency induction thermal plasma. Spherical particles 5,60 ,m in size were obtained and analyzed. Thermo-gravimetric analysis and X-ray diffraction analysis showed that during the short flight of the order of milliseconds, all carbonates were decomposed and >95% quartz was reacted into a noncrystalline state. Glass transition was clearly observed by differential thermal analysis. Increase of the carrier gas from 3 to 6 L/min led to a decrease in the volatilization ratio of Na2O from 46% to 18% with a slight decrease of the reaction ratio of quartz in trade balance. Electron probe microanalysis showed that the volatilization could be attributed to an excess heating of small particles <30 ,m, and suppression by the increase of carrier gas. [source]

Modulated Induction Thermal Plasmas , Fundamentals and Applications ,

IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING, Issue 4 2009
Yasunori Tanaka Member
Abstract This paper reviews fundamentals and applications of modulated induction thermal plasmas that have been developed. The coil-current modulation of the order of several hundreds amperes allows one to make a large disturbance in high-pressure and high temperature plasmas, and also to control the temperature and radical density in thermal plasmas in time domain. Examples will be introduced on application of the modulated induction thermal plasma to surface modification, in which thermally and chemically nonequilibrium effects are essential in temperature and radical density fields. Finally, dynamic behaviors of an arbitrary-waveform modulated induction thermal plasma that has recently been developed were also introduced as a new type of modulated induction thermal plasmas. © 2009 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. [source]

Numerical simulation of thermal interaction between polymer and argon induction thermal plasma

ELECTRONICS & COMMUNICATIONS IN JAPAN, Issue 1 2009
Yoshitaka Takeuchi
Abstract Influence of polymer powder injection into Ar thermal plasmas was investigated by numerical approaches. Thermal plasma,polymer solid coupling phenomena such as melting and evaporation were considered to study plasma-quenching effect of polymer injection. Dominant process for decay of plasma temperature was examined by changing thermodynamic parameters such as melting, boiling temperatures and their latent heats of solid and liquid polymers. As a result, thermodynamic properties of evaporated polymer vapor directly affect plasma-quenching phenomena more markedly than the properties of liquid and solid which influence plasma quenching efficiency through the amount of evaporation. © 2009 Wiley Periodicals, Inc. Electron Comm Jpn, 92(1): 24,33, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecj.10226 [source]

Modulated Induction Thermal Plasmas , Fundamentals and Applications ,

IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING, Issue 4 2009
Yasunori Tanaka Member
Abstract This paper reviews fundamentals and applications of modulated induction thermal plasmas that have been developed. The coil-current modulation of the order of several hundreds amperes allows one to make a large disturbance in high-pressure and high temperature plasmas, and also to control the temperature and radical density in thermal plasmas in time domain. Examples will be introduced on application of the modulated induction thermal plasma to surface modification, in which thermally and chemically nonequilibrium effects are essential in temperature and radical density fields. Finally, dynamic behaviors of an arbitrary-waveform modulated induction thermal plasma that has recently been developed were also introduced as a new type of modulated induction thermal plasmas. © 2009 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. [source]

In-Flight-Melted Soda-Lime-Silica Glass by RF Induction Thermal Plasma

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 12 2008
Fuji Funabiki
Granulated raw materials with a particle size of 20,80 ,m were prepared from a slurry of Na2CO3, CaCO3, and SiO2 (quartz) by the spray-dry method, and injected with carrier gas into a radio-frequency induction thermal plasma. Spherical particles 5,60 ,m in size were obtained and analyzed. Thermo-gravimetric analysis and X-ray diffraction analysis showed that during the short flight of the order of milliseconds, all carbonates were decomposed and >95% quartz was reacted into a noncrystalline state. Glass transition was clearly observed by differential thermal analysis. Increase of the carrier gas from 3 to 6 L/min led to a decrease in the volatilization ratio of Na2O from 46% to 18% with a slight decrease of the reaction ratio of quartz in trade balance. Electron probe microanalysis showed that the volatilization could be attributed to an excess heating of small particles <30 ,m, and suppression by the increase of carrier gas. [source]

Spheroidization of Titanium Carbide Powders by Induction Thermal Plasma Processing

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 9 2001
Ya-Li Li
Highly spherical particles of titanium carbide (TiC) have been produced by in-flight heat processing of irregularly shaped TiC powders in an aerosol reactor under argon-hydrogen and argon-helium induction thermal plasma. The spherical powders obtained by the plasma treatment consist of unagglomerated and uniform particles with mean diameters between 25 and 28.5 ,m, which is smaller than the original TiC particle mean diameters (29.5 ,m) because of partial evaporation of the particles during the plasma treatment. The spheroidization ratio of the treated TiC powders increases with the increase of hydrogen flow rate in plasma gases and the reduction of powder feeding carrier gas flow rate. Under certain processing conditions, the TiC powders have been completely spheroidized. The morphology and structure of individual spherical particles were examined and their formation mechanism was discussed based on calculation of heat transfer kinetics of the particles in the thermal plasma. [source]

Modulated Induction Thermal Plasmas , Fundamentals and Applications ,

IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING, Issue 4 2009
Yasunori Tanaka Member
Abstract This paper reviews fundamentals and applications of modulated induction thermal plasmas that have been developed. The coil-current modulation of the order of several hundreds amperes allows one to make a large disturbance in high-pressure and high temperature plasmas, and also to control the temperature and radical density in thermal plasmas in time domain. Examples will be introduced on application of the modulated induction thermal plasma to surface modification, in which thermally and chemically nonequilibrium effects are essential in temperature and radical density fields. Finally, dynamic behaviors of an arbitrary-waveform modulated induction thermal plasma that has recently been developed were also introduced as a new type of modulated induction thermal plasmas. © 2009 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. [source]