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Synthesis of silicon carbide powders from fumed silica powder and phenolic resin

Published online by Cambridge University Press:  01 May 2006

Satoru Ishihara ,
Hidehiko Tanaka  and
Toshiyuki Nishimura
Satoru Ishihara*
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
Hidehiko Tanaka
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
Toshiyuki Nishimura
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Silicon carbide powders were synthesized by application of sol-gel processing. Fumed silica powder was used as the starting material for the silicon source, and phenolic resin was used for the carbon source. The effects of mixing ratio and difference between hydrophilic and hydrophobic types of fumed silica powders were investigated. The stirred mixtures of fumed silica powders and phenolic resin became apparent sol states owing to homogeneous distribution. SiC powders were formed derived from both the types of fumed silica powders after the gelation and pyrolysis up to 1800 °C. The hydrophilic silica powder was effective to synthesize more homogeneous SiC powders than the hydrophobic type. Single-phase SiC was obtained in the C/Si (molar ratio after pyrolysis at 1000 °C) range between 1.0 and 2.5, while free carbon was contained in the obtained powders of C/Si > 2.5. In contrast, formation of SiC was insufficient, and SiO2 was retained at ratios of C/Si < 1.0.

Keywords

CeramicChemical synthesisPyrolysis
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 5 , May 2006 , pp. 1167 - 1174
Copyright
Copyright © Materials Research Society 2006

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