添加铜网对片层石墨/Al复合材料热物理性能的影响  

Effects of Cu mesh on thermal conductivity and mechanical properties of graphite flakes/Al composites

作　　者：曾凡坤 宁越洋 马洪兵[2] 薛晨[2] 江南[2] 童幸生[1] ZENG Fankun;NING Yueyang;MA Hongbing;XUE Chen;JIANG Nan;TONG Xingsheng(School of Electrical-Mechanical Engineering,Jiang Han University,Wuhan 430056,China;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Science,Ningbo 315201,China)

机构地区：[1]江汉大学机电与建筑工程学院,武汉430056 [2]中国科学院宁波材料技术与工程研究所,宁波315201

出　　处：《复合材料学报》2019年第10期2357-2363,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金青年基金(51501209)

摘　　要：使用盐浴法对片层石墨(GFs)进行表面镀Si处理,采用真空热压法制备片层石墨/Al复合材料(Si-GFs/Al)。向Si-GFs/Al复合材料中添加10vol%的铜网,研究了铜网对Si-GFs/Al复合材料热导率和力学性能的影响。使用SEM、聚焦离子束(FIB)和TEM对Si-GFs/Al复合材料的微观结构和微观界面进行表征,并分析了复合材料的断裂机制。结果表明,添加铜网使Si-GFs/Al复合材料内部出现了高聚集定向GFs带,形成高导热通道。当GFs体积分数为30vol%~40vol%时,Si-GFs/Al复合材料的热导率提升了约20%,弯曲强度提升了40%以上。当GFs体积分数为40vol%时,Si-GFs/Al复合材料热导率和弯曲强度同时达到一个优值,分别为512W/(m·K)和127MPa。The surface of graphite flakes(GFs)was coated with Si by salt bath method,and the graphite flakes/Al composites(Si-GFs/Al)were prepared by vacuum hot pressing method.10vol%Cu mesh was added to Si-GFs/Al composites,and the effects of Cu mesh on thermal conductivity and mechanical properties were studied.The microstructure and micro interface of Si-GFs/Al composites were characterized by SEM,focusing ion beam(FIB)and TEM.The fracture mechanism of the composites was analyzed.The results show that highly clustered GFs bands have been built in the Si-GFs/Al composites after Cu mesh added.When the GFs volume fraction is 30vol%~40vol%,the thermal conductivity of Si-GFs/Al composites increases by about 20%,and the bending strength increases by more than 40%.The thermal conductivity and bending strength of Si-GFs/Al composites with 40vol%GFs both reach a satisfactory value,which are 512W/(m·K)and 127MPa,respectively.

关 键 词：石墨/Al复合材料 热导率 弯曲强度 真空热压法 界面反应 

分 类 号：TB333[一般工业技术—材料科学与工程]