Dispersion of CNT via an effective two-step method, and enhanced thermal conductivity of Mg composite reinforced by the dispersed CNT

被引：16
作者：
Meng, Fanjing [1 ]
Du, Wenbo [1 ]
Lou, Feng [1 ]
Du, Xian [1 ]
Zhao, Chenchen [1 ]
Liu, Ke [1 ]
Li, Shubo [1 ]
机构：
[1] Beijing Univ Technol, Coll Mat Sci & Engn, Fac Mat & Mfg, 100 Ping Le Yuan, Beijing 100124, Peoples R China
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2022年 / 278卷
基金：
中国国家自然科学基金; 北京市自然科学基金;
关键词：
Mg matrix composite; Carbon nanotube; Thermal conductivity; CARBON NANOTUBES; MECHANICAL-PROPERTIES; GRAPHENE; WATER;
D O I：
10.1016/j.matchemphys.2021.125683
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Based on the co-dispersion behavior of CNT and graphene, an effective two-step process, from water-based to ethanol-based, for dispersing CNT was developed. The magnesium matrix composites reinforced with the dispersed CNT (D-CNT) were fabricated via powder metallurgy along with hot extrusion. Results indicated that CNT were complexed with graphene by the 7C-7C stacking interactions and the dispersion of CNT in water and ethanol relied on electrostatic repulsion and steric hindrance, respectively. The uniformly distributed D-CNT with the intact structure embedded into Mg matrix, forming the interfacial bonding with sandwich structure or embedded structure. The thermal conductivity of the 1.0 wt% D-CNT/Mg composite was reached up to 187.7 W/ (mK), 42.2% higher than that of pure Mg. The enhancement of thermal conductivity was ascribed to the multi tunnel effect of the D-CNT and the sandwich structure and/or embedded structures interface.
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页数：8
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