Synthesis of Si3N4 whiskers in porous SiC bodies

In Chul Jung, Sun Hee Cho, Sang Woong Na, Jaehyung Lee, Ho Seong Lee, Won Seung Cho

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23 Scopus citations

Abstract

Si3N4 whiskers were synthesized by the carbothermal reduction process in porous SiC bodies. The SiC bodies had a sponge microstructure with pore sizes of approximately 600 μm. The raw materials for the Si3N4 whiskers were powder mixtures of Si3N4, SiO2 and Si for silicon and phenolic resin for carbon. Cobalt was used as a metal catalyst. The carbothermal reaction was performed at 1400 °C or 1500 °C for 1 or 2 h. The α-Si3N4 whiskers grew inside the SiC pores by the VLS process, and their diameters ranged from 0.1 to 1.0 μm. The length of the grown Si3N4 whiskers was over 100 μm and their growth direction was [100].

Original languageEnglish
Pages (from-to)4843-4846
Number of pages4
JournalMaterials Letters
Volume61
Issue number26
DOIs
StatePublished - Oct 2007

Keywords

  • Ceramics
  • Porosity
  • Silicon carbide
  • Silicon nitride
  • Vapor-liquid-solid mechanism
  • Whisker

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