カーボンブラック-フェノール樹脂-エチルシリケート複合前駆体からの炭化ケイ素粒子生成プロセスの解析(テクニカルレポート)

概要

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Precursors for silicon carbide spherical particles were prepared from liquid mixtures of spherical carbon black, phenolic resin and ethyl silicate. After the gelation, drying and pyrolysis at 1273 K, carbon-silica hybrids were obtained with C/SiO_2 ratios in 2.77-2.98. In these pyrolyzed materials, a part of the carbon existed as carbon black dispersed in the matrix. The other carbon, which originated from phenolic resin, was located in the surrounding matrix area. These C-SiO_2 hybrids were heat-treated at 1838 K in an Ar gas flow to obtain SiC particles with carbothermic reduction process. The conversion process of the hybrids to SiC was monitored by thermo-gravimetric analysis. The influence of the carbon black content on conversion rates, residual amounts of excess carbon and the resulting SiC particle morphology were investigated.
2007-02-01