Synthesis and sintering of silicon nitride nano-powders via sodium reduction in liquid ammonia

Mei Yang, Qi Wang, Mingli Lv, Hongmin Zhu

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Nano-sized silicon nitride powders were synthesized through the reduction of silicon tetrachloride (SiCl4) by sodium in liquid ammonia at around -40 °C.The product was in uniform particles of several nanometers, and in the amorphous form. The amorphous structure was stable up to 1200 °C and turned to the crystal structure of α-Si3N4 at 1300 °C, and then to β-Si3N4 structure when heated at temperatures higher than 1450 °C.Via spark plasma sintering (SPS) dense bulks with 97.9% relative density of theoretic value and the grain size of 100-300 nm was successfully fabricated at 1500 °C without any sintering additives.

Original languageEnglish
Pages (from-to)1899-1904
Number of pages6
JournalJournal of the European Ceramic Society
Volume36
Issue number8
DOIs
Publication statusPublished - 2016 Jul 1

Keywords

  • Liquid ammonia
  • Nano-sized silicon nitride powders
  • Sodium Reduction
  • Spark plasma sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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