Journal
CARBON
Volume 50, Issue 3, Pages 1243-1252Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2011.10.043
Keywords
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Funding
- State Key Laboratory of Powder Metallurgy of China
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The effect of the type of carrier gas on the bulk density and microstructure distribution of carbon/carbon (C/C) composites fabricated by thermal gradient chemical vapor infiltration from propylene was investigated. The results show that the type of carrier gas has an appreciable influence on the radial distribution of density and microstructure of the C/C composites. When N-2 is used as carrier gas, the average bulk density of the carbon disk is 1.54 g/cm(3) after 400-h infiltration, and the radial density difference of the disk is 0.24 g/cm(3). Furthermore, smooth laminar pyrolytic carbon forms at the outer wall of the disks. When H-2 is used as carrier gas, an entirely rough laminar pyrolytic carbon matrix and C/C disks with average bulk density of 1.67 g/cm(3) are obtained in the same time, and the radial density difference of the disk is only 0.11 g/cm(3). No matter which of these two carrier gases is used, the lower density zone is found to be at or near the middle of the disks. (C) 2011 Elsevier Ltd. All rights reserved.
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