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Rapid Processing of Carbon-Carbon Composites by Forced Flow-Thermal Gradient Chemical Vapor Infiltration (FCVI)

Published online by Cambridge University Press:  15 February 2011

S. Vaidyaraman ,
W. J. Lackey ,
P. K. Agrawal ,
G. B. Freeman  and
M. D. Langman
S. Vaidyaraman
Affiliation:
School of Chemical Engineering, Georgia Institute of Technology, Atlanta, GA 30332
W. J. Lackey
Affiliation:
Georgia Tech Research Institute, Georgia Institute of Technology, Atlanta, GA 30332
P. K. Agrawal
Affiliation:
School of Chemical Engineering, Georgia Institute of Technology, Atlanta, GA 30332
G. B. Freeman
Affiliation:
Georgia Tech Research Institute, Georgia Institute of Technology, Atlanta, GA 30332
M. D. Langman
Affiliation:
Georgia Tech Research Institute, Georgia Institute of Technology, Atlanta, GA 30332
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Abstract

Carbon fiber-carbon matrix composites were fabricated using the forced flow-thermal gradient chemical vapor infiltration (FCVI) process. Preforms were prepared by stacking 40 layers of plain weave carbon cloth in a graphite holder. The preforms were infiltrated using propylene, propane, and methane. The present work showed that the FCVI process is well suited for fabricating carboncarbon composites; without optimization of the process, we have achieved uniform and thorough densification. Composites with porosities as low as 7% were fabricated in 8–12 h. The highest deposition rate obtained in the present study was ∼3 μm/h which is more than an order of magnitude faster than the typical value of 0.1–0.25 μm/h for the isothermal process. It was also found that the use of propylene and propane as reagents resulted in faster infiltration compared to methane.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 365: Symposium M – Ceramic Matrix Composites–Advanced High-Temperature Structural Materials , 1994 , 325
Copyright
Copyright © Materials Research Society 1995

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References

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