Synthesis, characterization and sintering of Si-C-N nano-powders via sodium reduction in liquid ammonia

Qi Wang, Mei Yang, Jiusan Xiao, Shuqiang Jiao, Komin Shu

Research output: Contribution to journalArticlepeer-review

Abstract

Si-C-N nano-powders with tunable carbon content were synthesized through the reduction of silicon tetrachloride (SiCl4) and trichloromethylsilane (SiCl3CH3) solution by sodium in liquid ammonia. The nano-powders contain two domains of structure, Si-C-N amorphous or continuous random networks (CRNs), and free carbon. The carbon content in Si3+nCnN4 CRNs, is tunable from n = 0 to n = 1. Free carbon will appeared with the increase of the C/Si mole ratio when C/Si is higher than 1/4. The crystallization of amorphous Si-C-N powders occurs at temperatures ranging from 1300 °C to 1500 °C depending on the carbon content. The additive-free dense Si-C-N ceramics with relatively low porosity were fabricated by Spark Plasma Sintering (SPS).

Original languageEnglish
Pages (from-to)1219-1226
Number of pages8
JournalJournal of the European Ceramic Society
Volume38
Issue number4
DOIs
Publication statusPublished - 2018 Apr 1

Keywords

  • Free carbon
  • Liquid ammonia
  • Nano-particles
  • Random networks
  • Sodium reduction
  • Spark plasma sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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