Chapter 22. Formation of an Alumina-Mullite Composite via Reaction Sintering
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1996 The American Ceramic Society
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
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1996
Print ISBN: 9780470375426
Online ISBN: 9780470314821
- mechanical properties;
- thermal expansion
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.