Chapter 74. Properties of Si3N4 – MOSi2 Composites with a Nanostructured Matrix

  1. Hau-Tay Lin and
  2. Mrityunjay Singh
  1. D. Sciti,
  2. S. Guicciardi and
  3. A. Bellosi

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294758.ch74

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4

How to Cite

Sciti, D., Guicciardi, S. and Bellosi, A. (2002) Properties of Si3N4 – MOSi2 Composites with a Nanostructured Matrix, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: B: Ceramic Engineering and Science Proceedings, Volume 23, Issue 4 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294758.ch74

Author Information

  1. CNR–IRTEC, Via Granarolo 64, 1 – 48018 Faenza, Italy

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375792

Online ISBN: 9780470294758

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Keywords:

  • nanostructured matrix;
  • silicon nitride;
  • molybdenum disilicide;
  • structural ceramic materials;
  • high-temperature refiactoriness

Summary

Si3N4 – composite materials containing different amounts of MoSi2 were produced by hot pressing. MoSi2 particles (mean size 0.8 μm) were homogeneously dispersed within a nanostructured Si3N4 matrix (mean grain size < 0.2 urn). The influence of MoSi2 inclusions on microstructure and electrical and mechanical properties of the composites is discussed.

As a result of both the refined microstructure of the matrix and presence of ductile inclusions, these materials possess good mechanical properties, with a bending strength up to 1130 MPa (RT) and 880 MPa (1000°C) and a fracture toughness up to 6 MPa-m 1/2 Electrical resistivity drops to ∼10–3 Ω–cm.