Effect of CNT orientation on the mechanical property and fracture mechanism of vertically aligned carbon nanotube/carbon composites. Issue 4 (March 2020)

• Record Type: Journal Article
• Authors: Shen, Sijia; Yang, Lingwei; Wang, Chuanyun; Wei, Liming
• Is Part Of: Ceramics international. Volume 46:Issue 4(2020)
• Page Start: 4933
• Page End: 4938
• Publication Date: 2020-03
• Subjects: CNT/C composite -- CNT arrays -- Nanomechanical property -- Orientation; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.10.230
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The effect of carbon nanotube (CNT) orientation on the mechanical properties and fracture mechanisms of a vertically aligned CNT/C composite was studied in this work by a combination of nanoindentation and micropillar compression techniques. The results suggest stronger response of the composite when loading parallel to the CNT orientation. This led to higher Young's modulus and hardness (≈34 GPa and ≈3.75 GPa) at this direction than those at perpendicular direction (≈19 GPa and ≈2.6 GPa). The mechanical anisotropy led to fracture mechanisms that were also dependent on the CNT orientation. At 0° direction, the composite was fractured into segments by splitting of the micropillar. While at 90° direction, the composite was much brittle and was fractured by dual shearing, implying a strong CNT/C interface.