Chapter 45. Effect of Ta2O5 Matrix Additions on the Microstructure and Mechanical Properties of SiC Fiber-Reinforced Lithia-Alumina-Silica Composites

  1. John B. Wachtman Jr.
  1. Hyun-Ho Shin,
  2. Randolph Kirchain and
  3. Robert F. Speyer

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314555.ch45

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

Shin, H.-H., Kirchain, R. and Speyer, R. F. (1994) Effect of Ta2O5 Matrix Additions on the Microstructure and Mechanical Properties of SiC Fiber-Reinforced Lithia-Alumina-Silica Composites, 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.ch45

Author Information

  1. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332

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:

  • elastic modulus;
  • glass-ceramic route;
  • fiber-reinforced brittle matrix composites;
  • matrix interfacial bonding;
  • multiple matrix cracking

Summary

Additions of 0 to 9 mol% Ta2O5 to a lithia-alumina-silica glass-ceramic matrix Nicalon SiC reinforced composite increased the elastic modulus and ultimate strength of the composite. The additive fostered spherulitic growth of β-spodumene solid solution crystals which concentrated Ta2O5, at the boundaries of the spherulites and adjacent to the fiber-matrix carbon-rich interphases. These regions reacted with the interphases as well as soluble carbon monoxide gas to convert them to TaC. The improvement in mechanical properties is attributed to TaC particulate reinforcement, and suggests a simple glass-ceramic route to the fabrication of particulate-reinforced ceramic matrix composites.