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The control of gas phase kinetics to maximize densification during chemical vapor infiltration

Published online by Cambridge University Press:  31 January 2011

Brian W. Sheldon
Brian W. Sheldon
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6063
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Abstract

A serious problem during the fabrication of composite materials by isothermal chemical vapor infiltration is that the matrix forms more rapidly at the external edges of the body and traps a large amount of porosity inside. In theory, this problem can be eliminated by controlling the gas-phase kinetics to obtain densification which is more rapid in the center of a preform than at its outer surfaces. An analysis of a first-order gas-phase reaction followed by a first-order deposition reaction indicates that improved infiltration is possible under a relatively narrow range of conditions.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 11 , November 1990 , pp. 2729 - 2736
Copyright
Copyright © Materials Research Society 1990

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References

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