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Jung, Yoon Seok
Electrochemical Solid-State Energy Storage Lab
Research Interests
  • Batteries, All-solid-state batteries, solid electrolytes, electrodes, atomic layer deposition,energy storage devices

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Formation of silica-coated carbon powder and conversion to spherical beta-silicon carbide by carbothermal reduction

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Title
Formation of silica-coated carbon powder and conversion to spherical beta-silicon carbide by carbothermal reduction
Author
Jung, Yoon SeokKwon, OJOh, SM
Keywords
PYROLYSIS; GELS
Issue Date
2002-08
Publisher
AMER CERAMIC SOC
Citation
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.85, no.8, pp.2134 - 2136
Abstract
Spherical β-SiC powders that are a few micrometers in size have been prepared by heating a mixture of phenolic resin powder and fine-grained fumed silica at 1600°C in argon. The overall process is composed of two consecutive steps: (i) the formation of silica-coated spherical carbon powder and (ii) carbothermal reduction. The irregularly shaped resin powder transforms to a spherical-shaped morphology in the first step, and the resulting silica-coated spherical carbon powder is converted to β-SiC in the second step. The key factor in the first step is the utilization of fumed silica that has hydrophobic surface functional groups. Hydrophobic interactions at the point of intimate contact between the resin powder and the silica likely reduce the surface energy of the resin powder, thereby discouraging interparticle coalescence. The resulting β-SiC powder exhibits a radially developed columnar microstructure. Hollow β-SiC spheres also can be prepared by controlling the reaction conditions in the carbothermal reduction step.
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ISSN
0002-7820
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ECHE_Journal Papers
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