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

Yoon Seok Jung, Ou Jung Kwon, Seung M. Oh

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)2134-2136
Number of pages3
JournalJournal of the American Ceramic Society
Volume85
Issue number8
DOIs
Publication statusPublished - 2002 Aug

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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