Journal of Materials Science

, Volume 27, Issue 14, pp 3706–3718 | Cite as

Effect of sintering additives on the behaviour of SiC whisker-reinforced Si3N4 composites

  • W. Kai
  • J. -M. Yang
  • C. J. Shih
  • A. Ezis


The effects of sintering additives on the microstructural development, whisker stability, oxidation resistance and room-temperature mechanical properties of the SiC whisker-reinforced Si3N4 matrix composites were investigated. Seven different combinations of Y2O3 and Al2O3 were used as sintering additives. The composites containing 20 vol % SiC whiskers were densified by hot pressing. The microstructure of the resulting composites was characterized using X-ray diffraction, scanning and transmission electron microscopy. Oxidation testing of the composite at 1400 °C was conducted to investigate the relationship between matrix compositions and oxidation resistance. The flexural strength, fracture toughness and crack propagation patterns were also characterized and correlated with the microstructural features.


Microstructure Transmission Electron Microscopy Al2O3 Fracture Toughness Y2O3 
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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • W. Kai
    • 1
  • J. -M. Yang
    • 1
  • C. J. Shih
    • 1
  • A. Ezis
    • 2
  1. 1.Department of Materials Science and EngineeringUniversity of CaliforniaLos AngelesUSA
  2. 2.Cercom Inc.VistaUSA

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