LIU Yu-tai, BAI Rui-cheng, LI Hong, ZHANG Jia-bao, REN Mu-su, SUN Jin-liang. Simulation of chemical vapor infiltration of propylene into C/C composites. New Carbon Mater., 2011, 26(5): 381-388.
Citation:
LIU Yu-tai, BAI Rui-cheng, LI Hong, ZHANG Jia-bao, REN Mu-su, SUN Jin-liang. Simulation of chemical vapor infiltration of propylene into C/C composites. New Carbon Mater., 2011, 26(5): 381-388.
LIU Yu-tai, BAI Rui-cheng, LI Hong, ZHANG Jia-bao, REN Mu-su, SUN Jin-liang. Simulation of chemical vapor infiltration of propylene into C/C composites. New Carbon Mater., 2011, 26(5): 381-388.
Citation:
LIU Yu-tai, BAI Rui-cheng, LI Hong, ZHANG Jia-bao, REN Mu-su, SUN Jin-liang. Simulation of chemical vapor infiltration of propylene into C/C composites. New Carbon Mater., 2011, 26(5): 381-388.
LIU Yu-tai, BAI Rui-cheng, LI Hong, ZHANG Jia-bao, REN Mu-su, SUN Jin-liang
Funds:
Shaanxi Science and Technology Research and Development Program (2011K07-10), The Natural Science Specialized Foundation from Shaanxi Department of Education (09JK449, 2010JK579), Guidance Research Program of China Textile Industry Association(2008046) and Basic Research Foundation of Xi’an Polytechnic University(XGJ08010).
Chemical vapor infiltration of propylene into C/C composites was studied by numeric simulation and an improved model for homogeneous gas-phase reactions of propylene pyrolysis was proposed. The model consists of 34 elementary reactions of 16 species. Then a bipore model for describing the changes of the pore topology with the progress of densification and a computer code for simulation of surface reactions by other authors were coupled together to predict the process. The numerical simulation showed that the density distribution of C/C composites is dependent on residence time of gas, densification temperature and densification time. There are two infiltration stages (rapid densification of micro-pores and successive densification of macro-pores) which act closely with the concentration distributions of main homogeneous pyrolytic products of propylene. Among them the concentration distribution of benzene seems most apparently to influence the densification speed and C/C density uniformity. The infiltration would be terminated when the benzene rich region becomes narrow, and the surface crusting of C/C appears. The present model is validated by comparing the predicted densities with the experimental ones.