FINITE ELEMENT SIMULATION OF THERMAL PROPERTIES OF COATED GRAPHITE FLAKE/ALUMINUM MATRIX COMPOSITES
Abstract
A three-dimensional, multi-scale finite element model was developed to predict the effective thermal conductivity of graphite flake/aluminum composites. The factors influencing the effective thermal conductivity and thermal expansion coefficient of graphite flake/aluminum composites were investigated, including the type and thickness of the coating, temperature, and the volume fraction of graphite flakes. The results indicate that higher thermal conductivity and reduced coating thickness enhance the thermal conductivity of the composites. Taking into account the thermal expansion behavior and coating costs, it is advisable to select a copper coating with a thickness maintained between 1 and 1.5 μm. Temperature fluctuations influence the thermal resistance at the interface and the strength of the bonding. While an increase in temperature can improve thermal conductivity, excessively high temperatures lead to a significant rise in the thermal expansion coefficient, adversely affecting overall performance. The optimal temperature is 300 °C. Copper plating treatment can enhance the thermal conductivity of the composites, and a higher volume fraction of graphite is associated with improved overall thermal performance, which aligns with the experimental results.
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