Chapter 17. Whisker Growth and Composite Fabrication in the SisN4-C System

  1. John B. Wachtman Jr.
  1. Hongyu Wang and
  2. Gary S. Fischman

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313978.ch17

Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10

Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10

How to Cite

Wang, H. and Fischman, G. S. (1994) Whisker Growth and Composite Fabrication in the SisN4-C System, in Proceedings of the 16th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 13, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313978.ch17

Author Information

  1. New York State College of Ceramics at Alfred University Alfred, NY 14802

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375198

Online ISBN: 9780470313978

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Keywords:

  • conventional;
  • transformation;
  • evaluate;
  • hybrid;
  • processibility

Summary

Silicon carbide whiskers were synthesized by carbothermal reduction of silicon nitride. The whisker microstructural study reveals that the whiskers may grow in two stages, core lengthening first followed by whisker thickening. Observations show that the possibility of root growth of the whisker core can not be excluded. Whisker growth via the VLS mechanism in the Si3N4C system was also studied, it is noted that diffusion along the liquid alloy droplet surface may be an important mass-transport path. Partial carbothermal reduction of silicon nitride results in a mixture of Si3N4 powders and SiC whiskers which can be used for making silicon nitride matrix reinforced with silicon carbide whisker composites. The properties of the composites can be improved by optimising both the whisker synthesizing and composite fabricating processes.