Enhancement of C/C-LAS joint using aligned carbon nanotubes prepared by injection chemical vapor deposition

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• 作者：Feng-Ling Zhao ; Qian-Gang Fu ; ^{fuqiangang@nwpu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Lei Feng ; Qing-Liang Shen
• 关键词：Mechanical characterization ; Composites ; Bonding ; Fracture ; Interfaces
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：5 January 2016
• 年：2016
• 卷：650
• 期：Complete
• 页码：67-74
• 全文大小：7365 K

文摘

Carbon nanotubes (CNTs) enhanced carbon/carbon-lithium aluminum silicate (C/C-LAS) joint was prepared by a three-step technique of pack cementation, injection chemical vapor deposition (ICVD) and hot-pressing. A layer of aligned CNTs was grown on the surface of SiC coated C/C composites by ICVD method, and the joint was obtained by hot-pressing with magnesium aluminum silicate (MAS) as the interlayer. SEM observation reveals that the introduced CNTs result in the formation of a dense and crack-free CNT/MAS nanocomposite interface between SiC and MAS. Compared with the joints without CNTs, the average shear strength of the joints reinforced by CNTs was improved by 48% accompanied by an obvious change in failure mode from brittle fracture without CNTs to plastic fracture with CNTs. The pulling-out and bridging of CNTs on the fracture surfaces had a positive effect on the strength enhancement of the C/C-LAS joint.