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

通过选择性界面改性提高铝铜复合铸件的导热率

• 批准号: 261481227
• 负责人: Professor Dr.-Ing. Hans Jürgen Maier
• 金额: --
• 依托单位: Institut für Werkstoffkunde (IW)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/261481227?language=en
• 关键词: Increase; thermal; conductivity; aluminum; copper

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.

在用于高功率密度电子设备或热交换器的复杂散热器部件的制造中，通常会连接铜和铝合金。然而，目前用于这些材料的连接工艺通常具有导热率降低的特点，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。为了获得最佳的传热效果，高导热率材料之间的冶金结合连接至关重要。在初步研究过程中，使用锌基涂层生产了一些复合铸件，结果发现，涂层材料和铸造参数对界面质量有很大影响。该项目的目标是生产铝-铜复合铸件，采用压铸工艺，具有高导热率的界面。将彻底检查粘合区域，以确定所得相的热物理性质以及该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过程中抑制不良相的形成，或者是否可以在之后通过铸造部件的热处理来减少不良相的形成。