Abstract Large-sized carbon nanotube lamella/silicon carbide matrix (CNTL/SiC) composites were fabricated by infiltrating SiC into a lamellar CNT skeleton as a matrix, which avoids the uneven dispersion and high-temperature sintering damage resulting from easily agglomerated CNTs. Due to the highly aligned lamellar structure of the CNTL, the compressive properties of the CNTL/SiC composites were anisotropic and were increased by increasing the number of CVI cycles. The in-plane compressive strengths were higher than the out-of-plane compressive strengths. The flexural strength was as high as 240 ± 5 MPa after 6 CVI cycles. After fracture, the CNTs were pulled-out from matrix, indicating that the CNTs played the main role in bearing load, enhancing the mechanical properties. Since the CNTL/SiC possessed numerous channels, the electromagnetic (EM) waves could be trapped and attenuated by repeated reflection and absorption, yielding outstanding electromagnetic interference (EMI) shielding effectiveness. The total shielding effectiveness (SET) values were significantly determined by the thickness and number of CVI cycles. Consequently, the SET values of the CNTL/SiC reached 33.1–35.7 dB, which means that the EMI shielding effectiveness is excellent.

中文翻译：

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三维碳纳米管薄片增强碳化硅增强机械和电磁屏蔽性能

摘要 通过将碳化硅作为基体渗透到层状碳纳米管骨架中，制备了大尺寸碳纳米管片层/碳化硅基体（CNTL/SiC）复合材料，避免了碳纳米管易团聚导致的分散不均匀和高温烧结损伤。由于CNTL的高度排列的层状结构，CNTL/SiC复合材料的压缩性能是各向异性的，并且随着CVI循环次数的增加而增加。面内压缩强度高于面外压缩强度。经过 6 次 CVI 循环后，弯曲强度高达 240 ± 5 MPa。断裂后，碳纳米管从基体中被拉出，表明碳纳米管在承载载荷中起主要作用，提高了力学性能。由于CNTL/SiC拥有众多通道，通过反复反射和吸收，可以捕获和衰减电磁 (EM) 波，从而产生出色的电磁干扰 (EMI) 屏蔽效果。总屏蔽效率 (SET) 值主要由 CVI 循环的厚度和数量决定。因此，CNTL/SiC 的 SET 值达到了 33.1–35.7 dB，这意味着 EMI 屏蔽效果非常好。