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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received August 30, 2011
Accepted December 31, 2011

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Modeling studies on the effects of the process parameters in forced-flow chemical vapor infiltration reactor for the preparation of C/C composites

Dong Geun Hwang Gui Yung Chung^†

Department of Chemical Engineering, Hongik University, 72-1, Sangsu-dong, Mapo-gu, Seoul 121-791, Korea

Korean Journal of Chemical Engineering, September 2012, 29(9),
10.1007/s11814-011-0303-2

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Abstract

The mathematical modeling for the preparation of C/C composites from propane by F-CVI (Forced-flow chemical vapor infiltration) was studied. Experimental data were fitted with the modeling calculations and an adjusted reaction rate constant was obtained. Effects of many operation parameters such as temperature, the inlet concentration of propane, flow rate, and the initial porosity were observed. The decrease of the deposition rate due to the decrease of porosity and the depletion of propane in the middle of the preform was compensated with the increase of the lateral surface area of fibers. It was confirmed that a slow reaction rate with a low temperature and a low concentration is necessary for a uniform infiltration. As the gas flow rate and the initial porosity increase, the amount of deposition increases.

Keywords

C/C Composites CVI Propane Numerical Modeling Process Parameter

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