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An Analysis of Densification Process of Carbon/Carbon Composites

Published online by Cambridge University Press:  22 February 2011

Seh-Min Oh  and
Yang-Duk Park
Seh-Min Oh
Affiliation:
Research Institute of Industrial Science and Technology, Organic Materials Division, PO Box 135, Pohang, Korea
Yang-Duk Park
Affiliation:
Research Institute of Industrial Science and Technology, Organic Materials Division, PO Box 135, Pohang, Korea
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Abstract

An analytical method was developed to calculate efficiency of densifying carbon/carbon (C/C) composite with pitch for each cycle. Three factors were defined in the densificationprocess: an impregnation efficiency, w, a retention efficiency, x, and an overall densification efficiency, E. The relationships developed were applied to the results for three cycles of densification of C/C composite to evaluate the factors which depend on the route of impregnation and carbonization. The impregnation efficiency increases as the process is repeated due to a decrease of porosity, and the retention efficiency shows a tendency to be in a reverse proportion to the impregnation efficiency. The overall densification efficiency depends on the carbonization yield of pitch impregnant. The carbonization route P+A+G is the most effective method in densifying C/C composites, in which pressure carbonization(P) increases the carbonization yield and the retention efficiency of pitch, and graphitization(G) increases the impregnation efficiency.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 349: Symposium T – Novel Forms of Carbon II , 1994 , 93
Copyright
Copyright © Materials Research Society 1994

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References

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