摘要
炭布叠层为预制体,采用等温CVI工艺制备出炭/炭(C/C)复合材料。通过调节丙烯与氢气的比例得到热解炭结构分别为粗糙层(RL),光滑层(SL),各向同性(ISO)的三种C/C复合材料,研究了热解炭组织结构对C/C复合材料热导率的影响,讨论了C/C复合材料的导热机理。结果表明:RL织构C/C复合材料的热导率无论是在平行方向还是在垂直方向上都明显高于SL和ISO织构C/C复合材料,在两个方向上,RL织构C/C复合材料的最大热导率比SL织构C/C复合材料分别大41.0%和31.7%,是ISO织构C/C复合材料的2倍多,且3种C/C复合材料的热导率随温度的升高呈现不同的变化趋势。
C/C composites were fabricated by isothermal chemical vapor infiltration （ICVI） using carbon cloth laminate as preform. Three kinds of pyrocarbons （rough laminar, smooth laminar and isotropic structures） were obtained by adjusting the ratio of propene/hydrogen. On the basis of the experimental investigation and theoretical analyses, thermal mechanism and the effect of microstructure of pyrocarbon on thermal conductivity of C/C composite were studied. The results show that： the thermal conductivity coefficients of the C/C composite with RL pyrocarbon are larger about 41. 0%and 31.7%, respectively, than that of the composite with SL pyrocarbon, and are 2 times larger than that of the composite with ISO pyrocarbon in two directions, The thermal conductivity coefficients for the three samples exhibit various trend with the increased temperatures.
出处
《炭素技术》
CAS
CSCD
2007年第5期10-13,共4页
Carbon Techniques
关键词
C/C复合材料
热解炭
热导率
导热机理
C/C composites
pyrocarbon
thermal conductivity coefficient
thermal mechanism
