Development of CNT/Si3N4 composites with improved mechanical and electrical properties

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86 Citations (Scopus)

Abstract

Silicon nitride based composites with different amount (1, 3 or 5 wt%) of carbon nanotubes have been prepared by using hot isostatic pressing. Composites with 1, 5 or 10 wt% carbon black and graphite have been manufactured, in comparison. Optimisation of the manufacturing processes has been performed, providing intact carbon nanotubes during high temperature sintering. In the case of 1 or 3 wt% carbon nanotube addition, the increase of gas pressure during sintering resulted in an increase of bending strength. It was found that microstructure features achieved by properly designed sintering parameters are the main responsible factors for the strength improvements. Scanning electron microscopy showed that carbon nanotubes have a good contact to the surface of silicon nitride grains. The electrical properties of silicon nitride matrices with carbon addition may change essentially.

Original languageEnglish
Pages (from-to)418-424
Number of pages7
JournalComposites Part B: Engineering
Volume37
Issue number6
DOIs
Publication statusPublished - Aug 18 2006

Keywords

  • A. Ceramic-matrix composites (CMCs)
  • B. Electrical properties
  • B. Mechanical properties
  • Carbon nanotubes
  • Silicon nitride

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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