摘要
以丙烯气作为炭源气体,普通炭毡作为增强体,采用多元耦合场CVI方法快速制备了炭/炭复合材料。为了在炭/炭复合材料制备的实验条件和材料质量之间建立相应的关系,设计了一组实验。通过使用偏光显微分析、XRD测定、Raman微区分析等手段对结果进行了表征。结果表明:在650℃,12kPa实验条件下可以得到密度较高、均匀性较好,并具有较好结构的炭/炭复合材料,这说明较低的温度和较高的压力适合实验需要。对样品中出现的巨大再生锥结构进行了简要的分析。实验中出现了一种新形貌的热解炭,其具有最高的可石墨化性能。这种雨点状偏光结构热解炭被命名为点状热解炭,其形成机理可以认为是电磁场吸附和不完全固化粘液层的脱氢炭化。
With propylene as carbon source, carbon felt as porous preform, C/C composites were rapid fabricated by multi-coupling fields CVI process. A series of experiments were designed for building relationship between fabrication parameters and material quality. Pyrocarbon microstructures were investigated with polarized optical microscope （PLM）, SEM, XRD and Raman spectra. The results show the C/C composite with higher density, uniformity and microstructure is obtained under the condition of 650℃ and 12 kPa. It indicates higher pressure and lower temperature are favorable. Analysis for giant regenerative cones in samples was carried out. A new type of pyrocarbon was observed under the PLM which has highest graphitizability. It is called ＂Dot structure＂ with its rain drop appearance and its formation mechanism is supposed electromagnetic field absorption and hydrogen abstraction and carbonization of non-fully solidified viscosity.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2007年第6期35-38,共4页
Journal of Materials Engineering
基金
国家重点基础研究发展计划973计划(2006CB600901)
