Effect of carrier gases on densification rate, bulk density and microstructure of carbon/carbon composites

HOU Zhen-hua; HAO Ming-yang; LUO Rui-ying; XIANG Qiao; YANG Wei; SHANG Hai-dong; XU Huai-zhe

doi:10.1016/S1872-5805(15)60196-2

Volume 30 Issue 4

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Article Navigation > New Carbon Mater. > 2015 > 30(4): 364-371

HOU Zhen-hua, HAO Ming-yang, LUO Rui-ying, XIANG Qiao, YANG Wei, SHANG Hai-dong, XU Huai-zhe. Effect of carrier gases on densification rate, bulk density and microstructure of carbon/carbon composites. New Carbon Mater., 2015, 30(4): 364-371. doi: 10.1016/S1872-5805(15)60196-2

Citation:

HOU Zhen-hua, HAO Ming-yang, LUO Rui-ying, XIANG Qiao, YANG Wei, SHANG Hai-dong, XU Huai-zhe. Effect of carrier gases on densification rate, bulk density and microstructure of carbon/carbon composites. New Carbon Mater., 2015, 30(4): 364-371. doi: 10.1016/S1872-5805(15)60196-2

Citation:

HOU Zhen-hua, HAO Ming-yang, LUO Rui-ying, XIANG Qiao, YANG Wei, SHANG Hai-dong, XU Huai-zhe. Effect of carrier gases on densification rate, bulk density and microstructure of carbon/carbon composites. New Carbon Mater., 2015, 30(4): 364-371. doi: 10.1016/S1872-5805(15)60196-2

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Effect of carrier gases on densification rate, bulk density and microstructure of carbon/carbon composites

doi: 10.1016/S1872-5805(15)60196-2

School of Physics and Nuclear Energy Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

Funds: National Natural Science Foundation of China (21071011).

Received Date: 2015-02-25
Accepted Date: 2015-09-07
Rev Recd Date: 2015-07-20
Publish Date: 2015-08-28

Abstract

Abstract

Effect of carrier gases(H₂ and CO₂) on the densification rate, bulk density and microstructure of carbon/carbon composites fabricated by isothermalchemical vapor infiltration from methane (CH₄) was investigated.In the initial 50 h, the densification rate obtained from CH₄-H₂ is obviously higher than that from CH₄-CO₂, while the densification rate from CH₄-H₂ is lower than that from CH₄-CO₂with a further increase of infiltration time. When the carrier gas is switched from H₂ to CO₂, the average bulk density of the compositeincreases from 1.626 to 1.723 g/cm³, the maximum radial density gradient decreases from 0.074 to 0.056 g/cm³, the matrix changes from the pure rough laminar to hybrid rough laminar pyrocarbon with overgrowth cones, and the average degree of graphitization reduces from 62.7% to 50.8%. These significant changes are caused by the fact that CO₂ can effectively reduce the surface deposition rate but does not inhibit the in-pore infiltration, and thatdefects are formed in the deposits by a CO₂ introduction in gas phase and the resulting overgrowth cones deteriorate the texture degree of pyrocarbon.
- Carbon/carbon composites,
- Microstructure,
- Chemical vapor deposition,
- Carrier gas

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References(16)

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