Growth of SiC whiskers by carbothermal reduction of mesoporous silica-carbon composites infiltrated with SiC nuclei

Kun Wang, Yi Bing Cheng, Huanting Wang

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Abstract

Mesoporous C-SiO2 nanocomposite with a low C/SiO2 molar ratio was infiltrated with polycarbosilane (PCS) which is a preceramic precursor for silicon carbide. Different silicon carbide nanostructures were synthesized by carbothermal reduction of mesoporous C-SiO2 nanocomposites via different heat treatments. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption-desorption analysis were used to characterize C-SiO2 nanocomposites and SiC products. SiC was not formed in the mesoporous C-SiO 2 nanocomposites without PCS at 1450°C. However, when it was infiltrated with PCS to allow a conversion of PCS into SiC nuclei in the mesopores during the heat treatment, highly crystalline SiC nanofibers and nanoparticles were produced.

Original languageEnglish
Pages (from-to)10-12
Number of pages3
JournalAustralian Ceramic Society. Journal
Volume45
Issue number1
Publication statusPublished - 2009

Keywords

  • Carbothermal reduction
  • Mesoporous
  • Preceramic precursor

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