J. Phys. IV France 09 (1999) Pr8-73-Pr8-77
The role of the pore surface area/pore volume ratio in chemical vapor infiltrationW. Benzinger and K. J. Hüttinger
Institut für Chemische Technik, Universität Karlsruhe, Kaiserstr. 12, 76128 Karlsruhe, Germany
Chemical vapor infiltration of a carbon fiber felt with carbon using methane was studied as a test reaction to demonstrate the influence of the pore surface area/pore volume ratio, [Ap/Vp], on infiltration kinetics as well as structures of the deposited carbon. With progressive infiltration this ratio continuously increases leading to a continuous change in deposition chemistry and kinetics. As a secondary effect carbons of different structures are deposited. All these effects can be exclusively explained with the pore surface area/pore volume ratio, [Ap/Vp].
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