Interactions in laser joining of metals to polymers

金属与聚合物激光连接中的相互作用

• 批准号: 417913350
• 负责人: Professor Dr.-Ing. Christian Hopmann
• 金额: --
• 依托单位: Institut für Kunststoffverarbeitung (IKV) in Industrie und Handwerk an der RWTH Aachen
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/417913350?language=en
• 关键词: Interactions; laser; joining; metals; polymers

The joining of metals and plastics becomes more and more important due to the increasing use of plastics in many industrial sectors and an increased demand for lightweight structures. This trend is reinforced by a development towards miniaturization and functional integration in the electrical industry as well as by the utilization of specific lightweight potentials of materials that are used in the automotive sector. Such compounds are, however, procedurally not easy to realize as the materials have very different physical and mechanical properties. Within this context, flat, firmly bonded compounds are especially difficult to realize.It is the aim of this research project to investigate the adhesion mechanisms and composite properties of firmly bonded, laser beam joined plastic-metal composites that were subjected to physical / chemical surface pre-treatments. The metallic specimens will be directly joined to the plastic specimen by using two different configurations in a lap joint procedure, utilizing direct as well as indirect laser beam joining processes. In a first step, significant influencing factors on the bond strength of thermally joined metal-plastic joints will be determined. The correlation of the process parameters and the obtained bond strengths allows the determination of useful process windows for selected material combinations. For this purpose, the failure behavior of thermal joints is analyzed and evaluated. Subsequently, an examination of the bonding strength and adhesion mechanisms is conducted in relation to the plasma pretreatment /coating. Additionally, the influence of the plasma pretreatment /coating on the aging of the composite is investigated. Furthermore, metal-plastic composites with metallic interlayers will be produced and examined concerning their bond strength and adhesion mechanisms. The influence of the metallic interlayers on the aging of the composite will be investigated as well. In the part that is concerned with modeling, the thermal and thermo-mechanical images of the direct and indirect laser beam joining processes will be used to calculate the local temperature fields as well as the thermally induced stresses. Finally, the process variants with a plasma pretreatment / coating or with metallic interlayers will be compared and evaluated.

由于塑料在许多工业领域的使用不断增加以及对轻质结构的需求不断增加，金属和塑料的连接变得越来越重要。电气行业向小型化和功能集成方向发展，以及汽车行业所用材料的特定轻量化潜力的利用，进一步强化了这一趋势。然而，这种化合物在程序上并不容易实现，因为这些材料具有非常不同的物理和机械性能。在此背景下，平坦、牢固粘合的化合物特别难以实现。该研究项目的目的是研究经受物理/化学表面处理的牢固粘合、激光束连接的塑料-金属复合材料的粘合机制和复合材料性能预处理。通过在搭接过程中使用两种不同的配置，利用直接和间接激光束连接工艺，将金属样本直接连接到塑料样本。第一步，将确定对热连接金属-塑料接头粘合强度的重要影响因素。工艺参数和获得的粘合强度的相关性允许确定所选材料组合的有用工艺窗口。为此，对热接头的失效行为进行了分析和评估。随后，对与等离子体预处理/涂层相关的结合强度和粘附机制进行检查。此外，还研究了等离子体预处理/涂层对复合材料老化的影响。此外，还将生产具有金属中间层的金属塑料复合材料，并检查其粘合强度和粘合机制。金属中间层对复合材料老化的影响也将被研究。在涉及建模的部分中，直接和间接激光束连接过程的热图像和热机械图像将用于计算局部温度场以及热致应力。最后，将比较和评估具有等离子预处理/涂层或金属夹层的工艺变体。