石墨烯/Al复合材料的显微组织和物理性能研究OA

Aluminum matrix composites have become mainstream in current research on light metal matrix composites because of their advantages,such as light weight,corrosion resistance,low thermal expansion coefficient,excellent electrical and thermal conductivity and excellent processing properties.Among them,graphene/Al composites are currently a hot research topic.To investigate the effect of graphene content on the physical properties of graphene/Al composites,graphene/Al composites with graphene mass fractions of 0%(pure aluminium),0.3%,0.6%and 0.9%were prepared via the cold press sintering method,and the micromorphology of the graphene/Al composites was analysed using optical microscopy,scanning electron microscopy and X-ray diffractometer.The density,hardness,specific heat capacity,thermal diffusion coefficient and thermal conductivity of the graphene/Al composites were tested and analysed using a high-precision solid densitometer,microhardness tester,high-temperature DSC analyser and laser thermal conductivity meter(LFA)to compare and analyse the mechanism of the influence of different graphene contents on the properties of the graphene/Al composites.The results show that the graphene in the graphene/Al composites is uniformly distributed in the aluminium matrix,and the addition of graphene results in obvious grain refinement in the matrix.When the graphene content is greater than 0.6 wt.%,the agglomeration of graphene is observed in the composites.With increasing graphene content,the density and densification of the graphene/Al composites gradually decrease,the hardness tends to increase and then decrease,the specific heat capacity gradually decreases,the thermal diffusion coefficient increases and then slightly decreases,and the thermal conductivity slowly increases.