Thermal Conductivity of Carbon/Carbon Composites with the Fiber/Matrix Interface Modified by Silicon Carbide Nanofibers

Thermal Conductivity of Carbon/Carbon Composites with the Fiber/Matrix Interface Modified by Silicon Carbide Nanofibers
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碳化硅纳米纤维改性纤维/基体界面碳/碳复合材料的导热性能

DOI:
10.4236/aces.2016.64045
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发表时间:
2016-08
期刊:
Advances in Chemical Engineering and Science (ACES)
影响因子:
--
通讯作者:
xiao peng
xiao peng
中科院分区:
其他
文献类型:
--
作者:
chen jie;xiong xiang;xiao peng

文献摘要

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采用CCVD法在单向碳预制体的碳纤维表面生长SiC纳米纤维,然后采用化学气相渗透法对预制体进行致密化,得到SiCNF-C/C复合材料。研究了SiC纳米纤维对热解炭微观结构和SiCNF-C/C复合材料导热性能的影响。结果表明,碳化硅纳米纤维在碳纤维表面诱导了高织构热解碳在其周围的沉积。碳纤维与热解碳之间的界面结合得到很好的调节。因此,在复合材料的界面处的传热效率得到了很好的提高。SiCNF-C/C复合材料的导热系数大于C/C复合材料,尤其是垂直于纤维轴向的导热系数。
Silicon carbide nanofibers grew on the surface of carbon fibers of a unidirectional carbon preform by CCVD and then chemical vapor infiltration was used to densify the preform to get the SiCNF-C/C composite. The effects of silicon carbide nanofibers on the microstructure of the pyrolytic carbon and the thermal conductivity of the SiCNF-C/C composite were investigated. Results show that silicon carbide nanofibers on the surface of carbon fibers induce the deposition of high texture pyrolytic carbon around them. The interface bonding between carbon fibers and pyrolytic carbon is well adjusted. So the efficiency of heat transfer in the interface of the composite is well enhanced. The thermal conductivity of the SiCNF-C/C composite is greater than that of the C/C composite, especially the thermal conductivity perpendicular to the fiber axis.
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