Investigation of C/Si3N4 nanocomposites

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Abstract

Nanocrystalline carbon black and graphite micrograins have been added to silicon nitride starting powder and sintering additives (Al2O3 and Y2O3). These mixtures were mechanochemically activated several hours in a planetary type alumina ball-mill in order to achieve a homogenous mass. As an alternative to nano- and micrograins, carbon fibres have been added to carbon free silicon nitride batches. Sinter-HIP has been applied to rectangular bars which were earlier dry pressed. Structural and morphological analysis were performed on as-prepared samples. Bending strength and elastic modulus have been found to be influenced by amount of carbon black and graphite introduced in silicon nitride matrix.

Original languageEnglish
Pages (from-to)332-337
Number of pages6
JournalMaterialwissenschaft und Werkstofftechnik
Volume34
Issue number4
DOIs
Publication statusPublished - Apr 1 2003

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Keywords

  • Ceramic matrix composites (CMC)
  • Hot isostatic pressing (HIP)
  • Mechanical milling
  • Scanning electron microscopy (SEM)
  • X-ray diffraction (XRD)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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