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 fib er preform was studied by polarized light microscope(PLM) and scanning electroni c microscope(SEM). The experimental results indicate that the amount of pyrolyti c carbon deposited on the surface of chopped carbon fiber is more than that on t he surface of long carbon fiber. The reason is the different porosity between th e 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 o n the surface of chopped carbon fiber. The pyrolytic carbon on the surface of lo ng carbon fibers is produced by the carbon precursor gas diffusing from the chop ped fiber and the Z-d fiber. Uniform pore distribution and porosity in preform are necessary for producing C/C composites with high properties.
The carbon/carbon composites were made by chemical vapor infiltration(CVI) with needled felt preform. The distribution of the pyrolytic carbon in the carbon fib er preform was studied by polarized light microscope(PLM) and scanning electroni c microscope(SEM). The experimental results indicate that the amount of pyrolyti c carbon deposited on the surface of chopped carbon fiber is more than that on t he surface of long carbon fiber. The reason is the different porosity between th e 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 o n the surface of chopped carbon fiber. The pyrolytic carbon on the surface of lo ng carbon fibers is produced by the carbon precursor gas diffusing from the chop ped fiber and the Z-d fiber. Uniform pore distribution and porosity in preform are necessary for producing C/C composites with high properties.
出处
《中国有色金属学会会刊：英文版》
CSCD
2004年第4期733-737,共5页
Transactions of Nonferrous Metals Society of China
基金
ProjectsupportedbytheNationalKeyIndustrialTestingProjectfromtheNationalPlanningandDevelopmentCommitteeofChina
关键词
碳/碳复合材料
热解碳
碳纤维
多孔材料
CVI
carbon/carbon composites
chemical vapor infiltration
carbon fiber prefo rm
porosity
pyrolytic carbon
