Analysis of the Thermal Properties of Scaly Graphite/Aluminum-based Thermal Composites
The scaled graphite with high thermal conductivity was used as the filling material,and thecomposite material with high thermal conductivity was prepared with aluminum matrix.ABAQUS was used to analyze the shape distribution pattern,arrangement position and volume fraction,graphite shape and heat flow channel.The simulation results show that when the volume fraction of scaly graphite in the composite material is 15％and the ratio of the long axis to the thickness of the graphite sheet is greater than 4,the composite material has a higher thermal conductivity.As the aspect ratio of graphite flakes increases,the thermal expansion performance of the composite material first increases and then decreases,but the impact on the entire composite material is relatively small.Four models with a graphite content of 25％and a ratio of 1,2,3,and 6 between the long and short axes is established.The thermal conductivity of the composite material increases first and then decreases with the ratio of the long and short axes of the flake graphite,and has a higher thermal conductivity when the ratio is between 3 and 5.Neat and continuous heat flow channels can transfer more heat,but their ability to counteract thermal stress is poor.
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