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An Analysis of Densification Process of Carbon/Carbon Composites

  • Seh-Min Oh (a1) and Yang-Duk Park (a1)

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.

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References

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1. Fitzer, E., Hüttner, W., and Manocha, L.M., Carbon 18, 291 (1980).
2. Weisshaus, H., Kenig, S., Kastner, E., and Siegmann, A., Carbon 28, 125 (1990).
3. Weisshaus, H., Kenig, S., and Siegmann, A., Carbon 29, 1203 (1991).
4. Fitzer, E., Kompalik, D., and Yudate, K., Fuel 66, 1504 (1987).

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