Hostname: page-component-76fb5796d-x4r87 Total loading time: 0 Render date: 2024-04-26T10:30:47.251Z Has data issue: false hasContentIssue false
  • English
  • Français

Pyrolytic Carbon Deposition on Graphitic Surfaces

Published online by Cambridge University Press:  15 February 2011

Ismail M. K. Ismail
Ismail M. K. Ismail*
Affiliation:
University of Dayton Research Institute c/o Phillips Laboratory/RKFC, Edwards Air Force Base, CA 93523-5000, USA
Get access

Abstract

The present study outlines the importance of carbon active sites in controlling the kinetics of pyrolytic carbon deposition on a graphitized pitch fiber at 1025°C. Blockage of active sites with chemisorbed hydrogen retards deposition rates substantially. Removal of the chemisorbed hydrogen from the occupied sites raises deposition rates to the normal values noted on a fresh “clean” surface. The effect of surface activation prior to deposition is discussed. Activating the surface generates additional active sites and enhances the rates. However, not all the newly developed sites contribute to the kinetics. After the deposition of the first carbon layer, a fraction of those newly developed sites is instantaneously blocked and does not further contribute to subsequent deposition. The remaining fraction, along with the original sites available before activation, keeps replicating during the remaining course of deposition. That is, the disappearance of one active site after carbon deposition is associated with the generation of a new site. This trend continues up to the deposition of 60 carbon layers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 250: Symposium R – Chemical Vapor Deposition of Refractory Metals and Ceramics II , 1991 , 71
Copyright
Copyright © Materials Research Society 1992

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Bokros, J. C., Chemistry and Physics of Carbon. Volume 5, Edited by Walker, P. L. Jr, (Marcel Dekker, Inc., New York, 1969), p. 1.Google Scholar
2. Je, J. H. and Lee, Jai Young, Carbon 22, 563 (1984).CrossRefGoogle Scholar
3. Kotlensky, W. V., Chemistry and Physics of Carbon. Volume 9, Edited by Walker, P. L. Jr. and Thrower, P. A. (Marcel Dekker, Inc., New York, 1973), p. 173.Google Scholar
4. Marinkovic, S. and Dimitruevic, S., Carbon 23, 691 (1985).CrossRefGoogle Scholar
5. Kaae, J. L., Carbon 23, 665 (1985).CrossRefGoogle Scholar
6. Tenser, P. A., Chemistry and Physics of Carbon. Volume 19, Edited by Thrower, P. A. (Marcel Dekker, Inc., New York, 1975), p. 19.Google Scholar
7. Goma, J. and Oberlin, A., Carbon 23, 85 (1985).CrossRefGoogle Scholar
8. Goma, J. and Oberlin, A., Carbon 24, 135 (1986).CrossRefGoogle Scholar
9. Ismail, I. M. K., Carbon 27. 958 (1989).Google Scholar
10. Ismail, I. M. K., Rose, M. M. and Mahowald, M. A., Carbon 29, 575 (1990).Google Scholar
11. Hoffman, W. P., Vastola, F. J. and Walker, P. L Jr., Carbon 23, 151 (1985).Google Scholar
12. Hoffman, W. P., Vastola, F. J., Walker, P. L. Jr, Carbon 26, 485 (1988).Google Scholar
13. Ismail, I. M. K., Carbon 25, 653 (1987).Google Scholar
14. Ismail, I. M. K., Carbon 26, 749 (1988).CrossRefGoogle Scholar