Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Tsinghua University, Beijing 100084, China.
Nanoscale. 2013 Jul 7;5(13):6181-6. doi: 10.1039/c3nr01069d. Epub 2013 Jun 4.
Multi-walled carbon nanotube (MWCNT)-based carbon/carbon composites were fabricated by the chemical vapor infiltration of pyrolytic carbon into pre-compressed MWCNT blocks. The pyrolytic carbon was deposited on the surface of the MWCNTs and filled the gaps between the MWCNTs, which improved the connection between the MWCNTs and formed a three-dimensional network structure. The mechanical and electrical properties were improved significantly. The values of the maximum compressed deformation, maximum breaking strength, Young's modulus and energy absorption are measured as 10.9%, 148.6 MPa, 1588.6 MPa and 13.8 kJ kg(-1), respectively. The conductivity reached about 204.4 S cm(-1), more than 10 times larger than that of pre-compressed MWCNT blocks. After annealing at 1800 °C in vacuum, the graphitization improved remarkably. The pyrolytic carbon deposited on the surface of the MWCNTs was rearranged along the walls, and resulted in an increase of the number of walls of the MWCNTs.
基于多壁碳纳米管（MWCNT）的碳/碳复合材料是通过将热解碳化学气相渗透到预压缩的 MWCNT 块中来制备的。热解碳沉积在 MWCNT 的表面上并填充了 MWCNT 之间的间隙，这提高了 MWCNT 之间的连接，并形成了三维网络结构。力学和电学性能得到了显著改善。最大压缩变形、最大断裂强度、杨氏模量和能量吸收的测量值分别为 10.9%、148.6 MPa、1588.6 MPa 和 13.8 kJ kg(-1)。电导率达到约 204.4 S cm(-1)，比预压缩的 MWCNT 块大 10 多倍。在真空 1800 °C 退火后，石墨化得到了显著改善。沉积在 MWCNT 表面上的热解碳沿着壁重新排列，导致 MWCNT 的层数增加。
