Chapter 22. Formation of an Alumina-Mullite Composite via Reaction Sintering

  1. John B. Wachtman Jr.
  1. D. G. Goski and
  2. W. F. Caley

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314821.ch22

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3

How to Cite

Goski, D. G. and Caley, W. F. (1996) Formation of an Alumina-Mullite Composite via Reaction Sintering, in Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314821.ch22

Author Information

  1. Department of Mining and Metallurgical Engineering, Technical University of Nova Scotia, Halifax, N.S. Canada B3J 2X4 (902) 420–7674

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1996

ISBN Information

Print ISBN: 9780470375426

Online ISBN: 9780470314821

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Keywords:

  • decomposes;
  • microelectrophoresis;
  • mechanical properties;
  • coefficients;
  • thermal expansion

Summary

Naturally occurring kyanite (Al2O3 SiO2) thermally decomposes above 1400C to form mullite (3Al2O3 2SiO2) and free silica. By sintering in an alumina matrix, the silica may subsequently react to form additional mullite, thereby forming an inexpensive mullite-alumina composite. Techniques including pH aging, sedimentation, micro-electrophoresis and rheology were employed to optimize aqueous processing conditions. The most stable dispersion pH for kyanite/alumina suspensions containing up to 20 vol% kyanite was established to be 3.5. Composite green bodies were cast and sintered specimens examined mineralogically using electron probe microanalysis.