| Microstructure of carbon fiber preform and distribution of pyrolytic carbon by chemical vapor infiltration |
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| 作者姓名： | 陈建勋 黄伯云 |
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| 作者单位： | StateKeyLaboratoryofPowderMetallurgy,CentralSouthUniversity,Changsha410083,China |
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| 基金项目： | ProjectsupportedbytheNationalKeyIndustrialTestingProjectfromtheNationalPlanningandDevelopmentCommitteeofChina |
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| 摘 要： | The carbon/carbon composites were made by chemical vapor infiltration(CVI) with needled felt preform. The distribution of the pyrolytic carbon in the carbon fiber preform was studied by polarized light microscope (PLM) and scanning electronic microscope(SEM). The experimental results indicate that the amount of pyrolytic carbon deposited on the surface of chopped carbon fiber is more than that on the surface of long carbon fiber. The reason is the different porosity between the layer of chopped carbon fiber and long carbon fiber. The carbon precursor gas which passes through the part of chopped carbon fibers decomposes and deposits on the surface of chopped carbon fiber. The pyrolytic carbon on the surface of long carbon fibers is produced by the carbon precursor gas diffusing from the chopped fiber and the Z-d fiber. Uniform pore distribution and porosity in preform are necessary for producing C/C composites with high properties.
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| 关 键 词： | 碳／碳复合材料 热解碳 碳纤维 多孔材料 CVI |
Microstructure of carbon fiber preform and distribution of pyrolytic carbon by chemical vapor infiltration |
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| CHEN Jian-xun,HUANG Bai-yun.Microstructure of carbon fiber preform and distribution of pyrolytic carbon by chemical vapor infiltration[J].Transactions of Nonferrous Metals Society of China,2004,14(4):733-737. |
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| Authors: | CHEN Jian-xun HUANG Bai-yun |
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| Abstract: | The carbon/carbon composites were made by chemical vapor infiltration(CVI) with needled felt preform. The distribution of the pyrolytic carbon in the carbon fiber preform was studied by polarized light microscope(PLM) and scanning electronic microscope(SEM). The experimental results indicate that the amount of pyrolytic carbon deposited on the surface of chopped carbon fiber is more than that on the surface of long carbon fiber. The reason is the different porosity between the layer of chopped carbon fiber and long carbon fiber. The carbon precursor gas which passes through the part of chopped carbon fibers decomposes and deposits on the surface of chopped carbon fiber. The pyrolytic carbon on the surface of long carbon fibers is produced by the carbon precursor gas diffusing from the chopped fiber and the Z-d fiber. Uniform pore distribution and porosity in preform are necessary for producing C/C composites with high properties. |
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| Keywords: | carbon/carbon composites chemical vapor infiltration carbon fiber preform porosity pyrolytic carbon |
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