Preparation and characterization of Si3N4-TiN nanocomposite via in situ Co-deposition in liquid ammonia

Mei Yang, Ming Li Lü, Hong Min Zhu

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1 Citation (Scopus)

Abstract

A new method of TiN/Si3N4 nanocomposite synthesis was described and tested. TiCl4 and SiCl4 used as the starting materials and sodium as the reduction agent were conducted in liquid ammonia respectively. TiCl4 and SiCl4 were reduced simultaneously and titanium nitride/silicon nitride nanocomposite powders were obtained by in situ co-deposition at temperatures around -45°C. X-ray diffraction patterns indicate that the product was amorphous and the by-product was sodium chloride. The product powders were heated up to 1600°C and crystallization to TiN and β-Si3N4 happened. Due to presence of TiN, the crystallization of silicon nitride in the mixture was later than that of pure silicon nitride. Transmission electron microscopy images show the average size of powders range from 10 nm to 40 nm and scanning electron microscopy images conformed that Ti and Si elements were dispersed uniformly. A green bulk nitride composite containing 20%TiN with the mean grain size of 100-300 nm and fracture toughness of 10.1±1.1 m1/2MPa, was obtained by spark plasma sintering at 1500-1600°C. The effect of TiN additive on microstructure and mechanical properties of composite bulk was discussed.

Original languageEnglish
Pages (from-to)717-720
Number of pages4
JournalChinese Journal of Chemical Physics
Volume20
Issue number6
DOIs
Publication statusPublished - 2007 Dec 1
Externally publishedYes

Keywords

  • Co-deposition
  • In situ
  • Liquid ammonia
  • Nanopowders
  • Silicon nitride
  • Titanium nitride

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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