Chapter 7. Influence of SiC Dispersion on Thermo-Mechanical Properties of Si3N4-SiC Nano-Composites

  1. John B. Wachtman Jr.
  1. K. Nhhara1,
  2. T. Hirano1,
  3. A. Nakahira1,
  4. K. Izaki2 and
  5. T. Kawakami2

Published Online: 28 MAR 2008

DOI: 10.1002/9780470310588.ch7

A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 9/10

A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 9/10

How to Cite

Nhhara, K., Hirano, T., Nakahira, A., Izaki, K. and Kawakami, T. (1989) Influence of SiC Dispersion on Thermo-Mechanical Properties of Si3N4-SiC Nano-Composites, in A Collection of Papers Presented at the 13th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 10, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470310588.ch7

Author Information

  1. 1

    Physics Dept. The National Defense Academy Yokosuka 239, Japan

  2. 2

    Mitubishi Gas Chemical Corp. Niigata 950-31, Japan

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780470374870

Online ISBN: 9780470310588

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Keywords:

  • sialon matrix composites;
  • yttrium aluminum garnet;
  • SIC whiskers;
  • mullite;
  • alumina

Summary

The Si3N4SiC composites were prepared by hot pressing the amorphous Si-C-N powder precursors from CVD of an (Si(CH)3]2NH-NH3N2 system. Transmission electron microscopic observations revealed that the SiC particles were mainly dispersed within Si3N4 matrix grains, and there seems to be no impurity phases at the Si3N4SiC interfaces. Roles of SiC dispersion are divided into two: the control of grain size and shape of Si3N4 matrix, and the decrease of slow-crack-growth rate at high temperatures. Thus, the SiC dispersions improved significantly the mechanical properties of Si3N4 ceramics. In this presentation, special emphasis will be placed on the understanding of nanostructure and interface effects of thermo-mechankal properties.