Direct joining of metals and polymers is a promising approach for today’s challenges in joining technology due to fast cycling time, its robustness, and the absence of duroplastic adhesives. Laser pretreatment of the metallic surface has been proven to enhance joint strength and has become a popular method for joining hybrid components. However, the versatility of the laser process allows the generation of endless variations in structure geometry. Such structures possess various geometric characteristics like depth, width, density, and orientation, which all influence joint strength. Precise laser structuring of aluminum by nanosecond-pulsed laser radiation was utilized to gain a deep understanding of the correlation between structure geometry characteristics and joint strength. After laser pretreating the metallic surface, the parts were subsequently joined with a thermoplastic polymer by injection molding. The authors were able to distinguish between the effect of surface enlargement and structure geometry effects, as well as directionality and arrangement of the structures on the specimen. Although the authors did not focus on producing joints with high shear strength, some specimens exceeded 12 MPa during lap shear testing. The results are a step further toward advanced joint design for thermal direct joining and its application.

中文翻译：

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精确的激光结构作为了解金属-聚合物接头的工具

金属和聚合物的直接连接是应对当今连接技术挑战的一种很有前途的方法，因为它具有快速的循环时间、坚固性和没有热固性粘合剂。金属表面的激光预处理已被证明可以增强接头强度，并已成为连接混合部件的流行方法。然而，激光工艺的多功能性允许在结构几何形状中产生无限变化。这种结构具有各种几何特征，如深度、宽度、密度和方向，都会影响接头强度。通过纳秒脉冲激光辐射对铝进行精确的激光结构化，以深入了解结构几何特征与接头强度之间的相关性。激光预处理金属表面后，这些部件随后通过注塑成型与热塑性聚合物连接。作者能够区分表面扩大和结构几何效应的影响，以及样本上结构的方向性和排列。尽管作者没有专注于生产具有高剪切强度的接头，但在搭接剪切测试中，一些试样超过了 12 MPa。结果是朝着用于热直接连接的先进接头设计及其应用迈进了一步。一些试样在搭接剪切试验期间超过 12 MPa。结果是朝着用于热直接连接的先进接头设计及其应用迈进了一步。一些试样在搭接剪切试验期间超过 12 MPa。结果是朝着用于热直接连接的先进接头设计及其应用迈进了一步。