Increase of the thermal conductivity of aluminum-copper compound castings by selective modification of the interface

在用于高功率密度电子设备或热交换器的复杂散热器组件的制造中，通常将铜和铝合金接合。然而，目前用于这些材料的连接工艺通常具有导热性降低的特点，此外，还具有很高的复杂性。借助复合铸造，可以在初始铸造过程中生产由不同材料制成的散热器。为了实现最佳的热传递，具有高导热性的材料之间的热粘合连接至关重要。使用锌基涂料，一些复合铸件生产在初步调查中，它被观察到的界面的质量受到涂层材料和铸造参数的强烈影响。该项目的目的是生产铝-铜复合铸件，其特点是具有高导热性的界面使用压铸工艺。将彻底检查粘合区，以确定所得相的热物理性质以及本项目中使用的不同涂层材料、涂层方法和涂层形态的影响。为了确保最佳的导热性，将研究是否可以在铸件的初始制造期间抑制不期望的相的形成，或者是否可以在之后通过对铸造部件的热处理来减少不期望的相的形成。

In the manufacture of complex heat sink components, which are used for electronics with high power densities or heat exchangers, usually copper and aluminum alloys are joined. However, the joining processes that are currently used for these materials, typically feature reduced thermal conductivity, and, in addition, possess a high complexity.With the aid of compound casting, heat sinks made from different materials might be produced during the initial casting process. For an optimal heat transfer, a metallurgically-bonded connection between materials with high thermal conductivities is essential. Using a zinc-based coating, some compound castings were produced during the preliminary investigations, and it was observed that the quality of the interface is strongly influenced by the coating material and the casting parameters.The aim of the proposed project is the production of aluminum-copper compound castings, which feature an interface with high thermal conductivity using the die-casting process. The bond zone will be examined thoroughly in order to determine the thermo-physical properties of the resulting phases as well as the influence of the different coating materials, the coating methods and the morphology of the coatings used in this project. In order to ensure an optimal thermal conductivity, it will be investigated if the formation of undesirable phases can be suppressed either during the initial manufacture of the casting or if it can be reduced afterwards by means of a heat treatment of the cast component.