Chapter 24. Stability of Ain-SiC Whisker Composites Containing Sintering Aids

  1. John B. Wachtman Jr.
  1. Thomas J. Mroz

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314555.ch24

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

How to Cite

Mroz, T. J. (1994) Stability of Ain-SiC Whisker Composites Containing Sintering Aids, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314555.ch24

Author Information

  1. Advanced Refractory Technologies, Inc., Buffalo, N.Y. 14207

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375334

Online ISBN: 9780470314555

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Keywords:

  • aluminum nitride reinforced;
  • silicon carbide whiskers;
  • thermal conductivity;
  • corrosion resistance;
  • normal processing temperatures

Summary

Aluminum nitride reinforced with silicon carbide whiskers is of interest for new structural applications, particularly those requiring improved thermal conductivity and /or corrosion resistance. However, because SiC and AlN form solid solutions at normal processing temperatures, fabrication of whisker composites has previously been unsuccessful. Recent work suggests that the reaction is enhanced by the liquid phase sintering aids normally used for AlN. Metastability has recently been demonstrated by omitting the sintering aid and reducing the time-at-temperature during hot pressing.

Elimination of the sintering aid phase will limit the thermal conductivity of the composite and will increase the temperature /pressure requirements for hot pressing. Thus, processing conditions that include sintering aids while preserving whisker stability are of interest. Recent progress in AlN-SiCw stability in sintering aid containing systems will be described.