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Carbothermal reduction of quartz in methane–hydrogen–argon gas mixture

Journal Article


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Abstract


  • Synthesis of silicon carbide (SiC) by carbothermal reduction of quartz in a CH<inf>4</inf>–H<inf>2</inf>–Ar gas mixture was investigated in a laboratory fixed-bed reactor in the temperature range of 1573 K to 1823 K (1300 °C to 1550 °C). The reduction process was monitored by an infrared gas analyser, and the reduction products were characterized by LECO, XRD, and SEM. A mixture of quartz–graphite powders with C/SiO<inf>2</inf> molar ratio of 2 was pressed into pellets and used for reduction experiments. The reduction was completed within 2 hours under the conditions of temperature at or above 1773 K (1500 °C), methane content of 0.5 to 2 vol pct, and hydrogen content ≥70 vol pct. Methane partially substituted carbon as a reductant in the SiC synthesis and enhanced the reduction kinetics significantly. An increase in the methane content above 2 vol pct caused excessive carbon deposition which had a detrimental effect on the reaction rate. Hydrogen content in the gas mixture above 70 vol pct effectively suppressed the cracking of methane.

Authors


  •   Li, Xiang
  •   Zhang, Guangqing
  •   Tang, Kai (external author)
  •   Ostrovski, Oleg (external author)
  •   Tronstad, Ragnar (external author)

Publication Date


  • 2015

Citation


  • Li, X., Zhang, G., Tang, K., Ostrovski, O. & Tronstad, R. (2015). Carbothermal reduction of quartz in methane–hydrogen–argon gas mixture. Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, 46 (5), 2384-2393.

Scopus Eid


  • 2-s2.0-84942192847

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=5251&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4230

Number Of Pages


  • 9

Start Page


  • 2384

End Page


  • 2393

Volume


  • 46

Issue


  • 5

Abstract


  • Synthesis of silicon carbide (SiC) by carbothermal reduction of quartz in a CH<inf>4</inf>–H<inf>2</inf>–Ar gas mixture was investigated in a laboratory fixed-bed reactor in the temperature range of 1573 K to 1823 K (1300 °C to 1550 °C). The reduction process was monitored by an infrared gas analyser, and the reduction products were characterized by LECO, XRD, and SEM. A mixture of quartz–graphite powders with C/SiO<inf>2</inf> molar ratio of 2 was pressed into pellets and used for reduction experiments. The reduction was completed within 2 hours under the conditions of temperature at or above 1773 K (1500 °C), methane content of 0.5 to 2 vol pct, and hydrogen content ≥70 vol pct. Methane partially substituted carbon as a reductant in the SiC synthesis and enhanced the reduction kinetics significantly. An increase in the methane content above 2 vol pct caused excessive carbon deposition which had a detrimental effect on the reaction rate. Hydrogen content in the gas mixture above 70 vol pct effectively suppressed the cracking of methane.

Authors


  •   Li, Xiang
  •   Zhang, Guangqing
  •   Tang, Kai (external author)
  •   Ostrovski, Oleg (external author)
  •   Tronstad, Ragnar (external author)

Publication Date


  • 2015

Citation


  • Li, X., Zhang, G., Tang, K., Ostrovski, O. & Tronstad, R. (2015). Carbothermal reduction of quartz in methane–hydrogen–argon gas mixture. Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, 46 (5), 2384-2393.

Scopus Eid


  • 2-s2.0-84942192847

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=5251&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/4230

Number Of Pages


  • 9

Start Page


  • 2384

End Page


  • 2393

Volume


  • 46

Issue


  • 5