Abstract
Graphite/Al composites have attracted much attrition due to their excellent thermal properties. However, the improvement of thermal conductivity (TC) is limited by the difficulty in controlling the orientation of graphite and the poor wettability between graphite and aluminum. In this study, a novel process for fabricating the Graphite/Al composites is proposed, which involves fabricating graphite film and aluminum foil into laminate material. Then, taking a rolling method, the fractured and well oriented graphite film can help the composite achieve high TC while maintaining a certain strength. The result reveals that both single and total reduction have a significant influence on the diameter and orientation of the graphite, and by adjusting the process parameters, composites with high TC can be acquired at a relatively low reinforcement volume. This near-net-forming process can directly meet the thickness requirements for electronic packaging and avoids the exposure of graphite to the surface during secondary processing, which is promising to promote the application for high TC Graphite/Al composites in thermal management.
Highlights
With the rapid development of electronic devices towards miniaturization, lightweight, and high performance, the heat produced by the ever-increasing power density has become a key problem in restricting the reliability and efficiency of electronic equipment [1,2]
In order to effectively dissipate heat, the thermal management materials with high thermal conductivity (TC) and low coefficient of thermal expansion (CTE) which matches to the semiconductors are urgently needed
By reducing the single reduction to 15%, the rolled piece is mainly affected by the friction of the roller, the deformation cannot penetrate into the interior, and the metal flow rate between the surface layer and the inner layer is quite different
Summary
Graphite films and pure Al 1060 foils (99.6% in purity, with TC of 234 W/m·K) were used as raw materials. Al foils with thickness of 50 μm ware purchased from Shanghai Yuanyi metals Co.Ltd (Shanghai, China). The graphite films with average thickness of 25 μm were acquired from Tanyuantech Co., Ltd. The in-plane and out-of-plane TC of the graphite films were measured to be 1258 W/m·K and 18 W/m·K, respectively
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