Chapter 8. Microwave-Assisted Chemical Vapor Infiltration
- John B. Wachtman Jr.
Published Online: 26 MAR 2008
Copyright © 1993 The American Ceramic Society
Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10
How to Cite
Spotz, M. S., Skamser, D. J., Day, P. S., Jennings, H. M. and Johnson, D. L. (2008) Microwave-Assisted Chemical Vapor Infiltration, in Proceedings of the 17th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 14, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314234.ch8
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 1993
Print ISBN: 9780470375273
Online ISBN: 9780470314234
- chemical vapor infiltration;
- microwave susceptor;
- chemical vapor infiltration (CVI);
Alumina fiber/α-alumina matrix composites have been formed by microwave-assisted chemical vapor infiltration (MCVI), taking advantage of thermal gradients developed by volumetric heating in combination with gas pressure gradients. Preforms consisted of 10–20 μm diameter fibers laid uniaxially into a cylindrical geometry 16 mm in diameter. The gaseous reactant mixture consisted of AICI3, H2, C02, and N2. Deposition was achievd by flowing reactants axially through the preform, inside which H20 is produced to hydrolyze AICI3. Heating was supplied by 2.45 GHz microwave energy in a single mode cavity with a perturbed TM012 mode. Heating was initiated with a fugitive additive which acted as a microwave susceptor. The radial thermal gradients produced preferential deposition initially near the preform center.