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The mathematical modeling for the preparation of C/C composites
from propane by F-CVI (Forced-flow Chemical Vapor Infiltration) was studied. The
modeling for the actual processes including overturning the preform in the middle
of the deposition process was carried out. Effects of the interval and the number
of overturning processes on the time changes of porosity distribution were observed.
The actual deposition process could be continued longer by overturning the preform.
Furthermore, the total amount of deposition increased twice when several times of
overturning were applied. It was confirmed that a low concentration and a slow reaction
rate are necessary for a uniform infiltration even when the preform is overturned
in the middle of the process.