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以碳毡为基底原位生长了碳纳米管(CNTs),借助化学气相渗透制备了CNTs-C/C复合材料。研究了催化剂含量对碳纳米管生长的影响以及不同含量碳纳米管对C/C复合材料弯曲性能的影响。结果表明:催化剂对CNTs产量影响较大,且含量越多,生成的CNTs量越大;原位生长CNTs引入的催化剂会导致CNTs-C/C复合材料弯曲性能变差;CNTs的加入改变了热解碳的沉积行为,诱导了球状和锥状小尺寸热解碳的形成,减少了微裂纹的出现。适量CNTs能提高C/C复合材料的弯曲强度和模量,并改善材料的断裂行为。
Carbon nanotubes (CNTs) were grown in situ on carbon felt, and CNTs-C / C composites were prepared by chemical vapor infiltration. The effect of catalyst content on the growth of carbon nanotubes and the effect of different content of carbon nanotubes on the bending properties of C / C composites were investigated. The results show that the catalyst has a great influence on the yield of CNTs, and the more the content of CNTs, the larger the amount of CNTs is. The CNTs-C / C composites have poor bending properties due to the introduction of CNTs. The de-carbon deposition behavior induced the formation of spherical and pyramidal small-size pyrolytic carbons and reduced the appearance of microcracks. Appropriate CNTs can improve the flexural strength and modulus of C / C composites and improve the fracture behavior of the composites.