Synthesis of silicon carbide (SiC) nanostructures and their composites has been a topic of interest for the scientific community due to the unique properties that can be obtained with nanoscale features. Herein, we report the scalable fabrication of anisotropic and low density, carbon nanotube/SiC (CNT/SiC) core-shell structures synthesized via chemical vapor infiltration (CVI) of silicon on aligned CNT foams followed by heat treatment at 1350 °C. Structures made of CNT/SiC nanotube networks with a thickness of 1 cm and length of 9 cm were prepared in the present work. Upon the removal of the CNT foam via calcination of the hybrid nanocomposite in air, a free-standing mechanically robust three-dimensional network of pure SiC nanotubes was left behind. The density of the synthesized CNT/SiC is the lowest reported for any C/SiC structure. Furthermore, the CNT/SiC hybrid nano-architecture demonstrated superb heat resistance and stability in ultrahigh temperature environment.

碳化硅（SiC）纳米结构及其复合材料的合成由于其具有纳米级特征而具有的独特特性，一直是科学界关注的话题。在这里，我们报告了各向异性和低密度的碳纳米管/ SiC（CNT / SiC）核-壳结构的可扩展制造，该结构是通过硅在对准的CNT泡沫上的化学气相渗透（CVI）合成的，然后在1350°C下进行热处理。在本工作中，准备了厚度为1 cm，长度为9 cm的CNT / SiC纳米管网络结构。在去除CNT泡沫通过在空气中煅烧杂化纳米复合材料后，留下了纯SiC纳米管的独立式机械坚固的三维网络。对于任何C / SiC结构，合成的CNT / SiC的密度是最低的。此外，CNT / SiC杂化纳米结构在超高温环境下表现出极好的耐热性和稳定性。