添加铜网对片层石墨/Al复合材料热物理性能的影响

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512 W/（mK）和127 MPa。 

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

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 512 W/(mK) and 127 MPa, respectively.