Effect of CNT addition and its orientation on thermal shock resistance of B4C/CNT composites fabricated by hot-pressing

Journal of Asian Ceramic Societies

Ryosuke S. S. Maki¹  Anna V. Gubarevich²  Fajar Muhammad²  Toyohiko Yano²  Katsumi Yoshida²  Jelena Maletaskic³  Tetsuo Uchikoshi⁴  Tohru S. Suzuki⁴ 

[1] Department of Applied Chemistry and Biotechnology, Okayama University of Science, Kita-ku, Japan;Laboratory for Zero-Carbon Energy, Tokyo Institute of Technology, Tokyo, Japan;Material Science Laboratory, University of Belgrade, Belgrade, Serbia;Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan;

关键词: Boron carbide (B4C);    carbon nanotube (CNT);    composites;    thermal shock resistance;   

DOI  :  10.1080/21870764.2022.2054512

来源: DOAJ

【 摘 要 】

This paper describes the synthesis of B4C/carbon nanotube (CNT) composite by hot-pressing and shows the details for the effectiveness of CNT addition, additive amount and its orientation on the thermal shock resistance. CNTs tend to array perpendicular to the hot-pressing direction, which caused anisotropic mechanical and thermal properties of B4C/CNT composite. We investigated the residual bending strength of thermally shocked B4C/CNT composites and determined the critical temperature ΔTC that causes precipitous strength drop. In the case of B4C/15 vol% CNT composite, the residual bending strength almost unchanged at ~450°C; ΔTC increased by 150°C or more than that of monolithic B4C. Based on the thermal stress fracture-resistance parameter R’ of the composites, it was clarified that the excellent R’ is mainly due to the higher thermal conductivity and lower elastic modulus. The numerical results showed that CNT addition has a pronounced effect on the thermal shock residual bending strength and thermal stress fracture-resistance of B4C/CNT composite.

【 授权许可】

Unknown