Chapter 8. Microwave-Assisted Chemical Vapor Infiltration

  1. John B. Wachtman Jr.
  1. Mark S. Spotz,
  2. Daniel J. Skamser,
  3. Paul S. Day,
  4. Hamlin M. Jennings and
  5. D. Lynn Johnson

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314234.ch8

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

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

Author Information

  1. Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1993

ISBN Information

Print ISBN: 9780470375273

Online ISBN: 9780470314234

SEARCH

Keywords:

  • chemical vapor infiltration;
  • uniaxially;
  • microwave susceptor;
  • chemical vapor infiltration (CVI);
  • deposition

Summary

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.