期刊
CARBON
卷 57, 期 -, 页码 371-379出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2013.01.085
关键词
-
资金
- National Basic Research Program of China [2011CB605801]
Rapid densification of thick-walled carbon/carbon (C/C) composite tubes by electrically coupled chemical vapor infiltration (EC-CVI) was investigated. The bulk densities and pore sizes of the C/C composites after different densification periods were measured. The results show that C/C composites were able to be densified by EC-CVI rapidly and efficiently. A thick-walled C/C composite tube, whose outer diameter, inner diameter and height was 240, 60 and 200 mm, respectively, was able to be densified to 1.71 g/cm(3) after a densification time of 400 h. If the outer diameter and inner diameter were increased to 400 and 100 mm, respectively, the final density of the component reached 1.50 g/cm(3) under the same experimental condition. After densified by EC-CVI, the amount of the pores with a size larger than 100 mu m decreased significantly, and the porosity was even close to zero for the composites with a density of 1.62 g/cm(3). It indicates that EC-CVI can effectively fill the large pores in the composites. In the densified composite by EC-CVI, the pyrocarbon on the carbon fibers presented a rough laminar and smooth laminar morphology dominantly. Finally, the densification mechanism of the C/C composites by EC-CVI was simulated by the fractal method. (c) 2013 Elsevier Ltd. All rights reserved.
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