An emerging class of 3D GNPs&MWCNTs structure of Mg matrix composites with improved thermal conductivity  

作　　者：Qian Zhang Wenlong Tian Jiming Zhou Yan Lia Lehua Qi 

机构地区：[1]School of Mechanical Engineering,Northwestern Polytechnical University,Xi’an 710072,China [2]Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials,Xi’an 710072,China [3]Research&Development Institute of Northwestern Polytechnical University in Shenzhen,Northwestern Polytechnical University,Shenzhen 518057,China

出　　处：《Journal of Magnesium and Alloys》2024年第12期5051-5060,共10页镁合金学报(英文)

基　　金：supported by the National Natural Science Foundation of China(grant numbers 52231004,51972271 and 52205415);Guangdong Basic and Applied Basic Research Foundation(No.2021A1515110034)。

摘　　要：Graphene nanoplates(GNPs)and carbon nanotubes(CNTs)can construct efficient thermal flux channels in composites,which is becoming one of the effective methods to improve thermal conductivity(TC)of composites.In this paper,an emerging class of GNPs&MWCNTs preform with 3D orientated structures were prepared by using electrostatic self-assembly and directional freeze-drying methods,and then fabricated the GNPs&MWCNTs reinforced AZ91D magnesium(GNPs&MWCNTs/AZ91D)composites by squeeze casting process.To ensure the well preparation of the composites,the GNPs&MWCNTs preforms need to possess enough compression strength to withstand squeezing pressure.Therefore,the effects of the electrostatic self-assembly process,directional freeze drying process and thermal reduction process on the compression strength of 3D structure GNPs&MWCNTs preforms were studied.The compression strength of GNPs&MWCNTs preforms were well improved to 98 KPa,which were used for the fabrication of AZ91D matrix composites.The TC of 0.5 wt.%(1:1)GNPs&MWCNTs/AZ91D composites reached 71.7 W/(m·K)in the freezing direction,which was 41.8%higher than that(50.6 W/(m·K))of the AZ91D alloy.This work provides a novel method for preparing GNPs&MWCNTs/AZ91D composites with improved TCs.

关 键 词：AZ91D matrix composites 3D structure Carbon nanotube Graphene nanoplate Thermal conductivity 

分 类 号：TB33[一般工业技术—材料科学与工程]