TY - JOUR
T1 - Anisotropic compressive properties of CNT/SiC composites produced by direct matrix infiltration of vertically aligned CNT forests
AU - Han, Daoyang
AU - Mei, Hui
AU - Farhan, Shameel
AU - Xiao, Shanshan
AU - Bai, Qianglai
AU - Cheng, Laifei
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017
Y1 - 2017
N2 - Carbon nanotube-reinforced silicon carbide composites (CNT/SiC) produced by direct infiltration of matrix into a porous CNT arrays have been demonstrated to possess a unique microstructure and excellent micro-mechanical properties. Here, the study reports on the anisotropic compressive behavior of vertically aligned CNT-reinforced SiC composites (VACNT/SiC) produced by chemical vapor infiltration (CVI) of SiC matrix into the VACNT forests. Findings demonstrate that the longitudinal and transverse compressive strengths of VACNT/SiC specimens with a density of 1.54 g/cm3are 160 ± 16 and 41 ± 3 MPa, respectively. No matter which compressive mode they all exhibit a typical ductile failure with a similar load-displacement behavior but the stress concentration level of the transverse compression is lower than that of the longitudinal. The mechanisms describing the enhanced strength of these composites were clarified by examining the morphologies of fracture surfaces under scanning electron microscope. CNT pull-out, bridging, sequential breaking and slippage of the walls of the CNT during failure were consistently observed in all fractured specimens.
AB - Carbon nanotube-reinforced silicon carbide composites (CNT/SiC) produced by direct infiltration of matrix into a porous CNT arrays have been demonstrated to possess a unique microstructure and excellent micro-mechanical properties. Here, the study reports on the anisotropic compressive behavior of vertically aligned CNT-reinforced SiC composites (VACNT/SiC) produced by chemical vapor infiltration (CVI) of SiC matrix into the VACNT forests. Findings demonstrate that the longitudinal and transverse compressive strengths of VACNT/SiC specimens with a density of 1.54 g/cm3are 160 ± 16 and 41 ± 3 MPa, respectively. No matter which compressive mode they all exhibit a typical ductile failure with a similar load-displacement behavior but the stress concentration level of the transverse compression is lower than that of the longitudinal. The mechanisms describing the enhanced strength of these composites were clarified by examining the morphologies of fracture surfaces under scanning electron microscope. CNT pull-out, bridging, sequential breaking and slippage of the walls of the CNT during failure were consistently observed in all fractured specimens.
KW - Anisotropic compressive behavior
KW - Chemical vapor infiltration (CVI)
KW - Vertically aligned carbon nanotube forests (VACNT)
KW - Vertically aligned carbon nanotube/silicon carbide composites (VACNT/SiC)
UR - http://www.scopus.com/inward/record.url?scp=85010695255&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2017.01.185
DO - 10.1016/j.jallcom.2017.01.185
M3 - 文章
AN - SCOPUS:85010695255
SN - 0925-8388
VL - 701
SP - 722
EP - 726
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -