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Carbothermal reduction of quartz in different gas atmospheres

Journal Article


Abstract


  • © 2015 The Minerals, Metals & Materials Society and ASM International This article examines the influence of gas atmosphere on the synthesis of silicon carbide by carbothermal reduction of quartz. The quartz was crushed to <70 μm, uniformly mixed with graphite and pressed into pellets. Reduction was studied in isothermal and temperature-programmed reduction experiments in a tube reactor in argon, hydrogen and Ar-H2 gas mixtures. The concentrations of CO, CO2, and CH4 in the off gas were measured online using an infrared gas analyzer. The samples after reduction were characterized by X-ray diffraction, scanning electron microscope, and LECO analyzer. The carbothermal reduction of quartz in hydrogen was faster than in argon. Formation of silicon carbide started at 1573 K (1300 °C) in argon, and 1473 K (1200 °C) in hydrogen. Synthesis of silicon carbide in hydrogen was close to completion in 270 minutes at 1673 K (1400 °C), 140 minutes at 1773 K (1500 °C), and 70 minutes at 1873 K (1600 °C). Faster carbothermal reduction rate in hydrogen was attributed to the involvement of hydrogen in the reduction reactions by directly reducing silica and/or indirectly, by reacting with graphite to form methane as an intermediate reductant.

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 different gas atmospheres. Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, 46 (3), 1343-1352.

Scopus Eid


  • 2-s2.0-84929702619

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3437

Has Global Citation Frequency


Number Of Pages


  • 9

Start Page


  • 1343

End Page


  • 1352

Volume


  • 46

Issue


  • 3

Place Of Publication


  • United States

Abstract


  • © 2015 The Minerals, Metals & Materials Society and ASM International This article examines the influence of gas atmosphere on the synthesis of silicon carbide by carbothermal reduction of quartz. The quartz was crushed to <70 μm, uniformly mixed with graphite and pressed into pellets. Reduction was studied in isothermal and temperature-programmed reduction experiments in a tube reactor in argon, hydrogen and Ar-H2 gas mixtures. The concentrations of CO, CO2, and CH4 in the off gas were measured online using an infrared gas analyzer. The samples after reduction were characterized by X-ray diffraction, scanning electron microscope, and LECO analyzer. The carbothermal reduction of quartz in hydrogen was faster than in argon. Formation of silicon carbide started at 1573 K (1300 °C) in argon, and 1473 K (1200 °C) in hydrogen. Synthesis of silicon carbide in hydrogen was close to completion in 270 minutes at 1673 K (1400 °C), 140 minutes at 1773 K (1500 °C), and 70 minutes at 1873 K (1600 °C). Faster carbothermal reduction rate in hydrogen was attributed to the involvement of hydrogen in the reduction reactions by directly reducing silica and/or indirectly, by reacting with graphite to form methane as an intermediate reductant.

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 different gas atmospheres. Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, 46 (3), 1343-1352.

Scopus Eid


  • 2-s2.0-84929702619

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3437

Has Global Citation Frequency


Number Of Pages


  • 9

Start Page


  • 1343

End Page


  • 1352

Volume


  • 46

Issue


  • 3

Place Of Publication


  • United States