Enhanced Physical and Thermal Performance of Expanded Graphite-Based Heat Sink for LED Radiator

摘要

An experimental study was carried out to investigate the heat transfer characteristics of Cu and Al-modified expanded graphite heat sinks. In this study, the heat sinks were composed of expanded graphite as an active material, Cu and Al as heat transfer enhancement material and resin as a binder. Graphite with high purity was obtained via treated with different amount of Na2CO3. The as-prepared heat sinks were characterized by XRD, pH, SEM, electrical resistivity, bending strength and thermal analysis. The metal Al modified expanded graphite composite heat sink in our experiment exhibited a good rate of capability in physical and thermal performances. Sample GA5-300 showed highest thermal diffusivity and thermal conductivity.