摘要
以40％,30％及25％3种不同纤堆体积分数的针刺整体毡为坯体,经3次CVI后得到C／C复合材料;采用X射线衍射与拉曼光谱微区分析测试了3个试样在沉积态与2200,2400℃热处理的宏观与微区石墨化度,并在偏光下观察了其微观结构,分析了不同纤维体积分数的CVIC／C复合材料石墨化度不同的原因。结果表明:CVI后的热解炭为典型光滑层结构,且随着纤维体积分数的增加C／C复合材料在不同热处理温度下的石墨化度增加;热处理温度越南,石墨化度越高;纤维与光滑层热解发界面及2种不同光滑层热解发界面均发生应力石墨化,导致纤维体积分数高的试样石墨化度高。
In this paper, C/C composites were made by needled felt with fibre volume fraction 40%, 30% and 25% densifing through three times of CVI. The graphitization degree of C/C composites at 2 200 and 2 400 ℃ were investigated by means of X-ray diffraction and Raman spectra. And the microstructure was observed by optical metallography. The results show that C/C composites with higher fiber volume fraction have higher graphitization degree. The higher the HTT, the higher graphitization degree; stress graphitization takes place at the interface between fibre and smooth laminar pyrolytic carbon and that of different smooth laminar pyrolytic carbons, which is the reason for that C/C composites with higher fiber volume fraction have higher graphitization degree.
出处
《粉末冶金材料科学与工程》
EI
2004年第3期254-258,共5页
Materials Science and Engineering of Powder Metallurgy
基金
国家重点工业性实验项目((计高技)[1998]1817)
关键词
纤维体积分数
C/C复合材料
石墨化度
应力石墨化
carbon/carbon composite
fiber volume fraction
graphitization degree
stress graphitization
