TY - JOUR
T1 - Three-dimensional CNT lamellae reinforced SiC for enhanced mechanical and electromagnetic shielding properties
AU - Mei, Hui
AU - Fan, Yuntian
AU - Yan, Yuekai
AU - Han, Daoyang
AU - Cheng, Laifei
N1 - Publisher Copyright:
© 2020 Elsevier Ltd and Techna Group S.r.l.
PY - 2020/11
Y1 - 2020/11
N2 - 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.
AB - 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.
KW - Carbon nanotube/silicon carbide composites
KW - Chemical vapor infiltration
KW - Electromagnetic interference shielding effectiveness
KW - Mechanical properties
UR - http://www.scopus.com/inward/record.url?scp=85088216317&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2020.06.286
DO - 10.1016/j.ceramint.2020.06.286
M3 - 文章
AN - SCOPUS:85088216317
SN - 0272-8842
VL - 46
SP - 25008
EP - 25016
JO - Ceramics International
JF - Ceramics International
IS - 16
ER -