Journal
CARBON
Volume 41, Issue 12, Pages 2325-2337Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0008-6223(03)00284-7
Keywords
pyrolytic carbon; chemical vapor infiltration; mercury porosimetry; optical microscopy; microstructure
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Chemical vapor infiltration of a 2D carbon fiber preform with a 0/0/90/90degrees fiber architecture and a fiber volume fraction of 22.5% was investigated as a function of methane pressure at various temperatures as well as a function of infiltration time at constant pressure. Inside-outside densification was obtained at the most attractive temperature of 1095 degreesC up to 29 kPa resulting in a maximum bulk density of 1.84 g cm(-3) and a matrix density of 2.17 g cm(-3), which corresponds to high-textured carbon. Texture formation can be perfectly explained with the earlier proposed particle-filler model. Studies at increasing infiltration times suggest a recrystallization of carbon deposited in the early stages of the infiltration. (C) 2003 Published by Elsevier Ltd.
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