Chapter 34. Rapid Densification of Carbon-Carbon by Thermal-Gradient Chemical Vapor Infiltration

  1. John B. Wachtman Jr
  1. I. Golecki,
  2. R. C. Morris,
  3. D. Narasimhan and
  4. N. Clements

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314715.ch34

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

How to Cite

Golecki, I., Morris, R. C., Narasimhan, D. and Clements, N. (1995) Rapid Densification of Carbon-Carbon by Thermal-Gradient Chemical Vapor Infiltration, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314715.ch34

Author Information

  1. AlliedSignal Inc., Corporate Research and Technology, 101 Columbia Road, Morristown, NJ 07962.

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1995

ISBN Information

Print ISBN: 9780470375372

Online ISBN: 9780470314715

SEARCH

Keywords:

  • patented;
  • densified;
  • cyclopentane;
  • microstructure;
  • decompose

Summary

Using a novel patented method, porous carbon-carbon preforms, 10.8 cm (4.25″) od ± 4.4 cm (1.75″) id ± 3.0 cm (1.2″) thick have been densified in as little as 26 h in a one-cycle process. The disks are heated by induction in a manner which creates an inside-out thermal gradient, and are exposed to cyclopentane vapor in a water-cooled vacuum chamber. Rough-laminar carbon microstructure is obtained. A compressive strength of 268 MPa at 1.79 g/cm3 is measured. The densification rate and end point are monitored in real time. The precursor utilization efficiency is 20-30%, the amount of tar generated is very small and no measurable soot is observed. Our process has significant scale-up potential, is economically competitive and can be used in other materials systems.