Investigation of the media tightness of a microform-fitted plastic/light metal composite

IF 3.8 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Moritz Mascher, Pia Wagner, Christian Hopmann
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Abstract

Plastic/metal hybrid components made of amorphous thermoplastics such as polycarbonate and light metals such as aluminum offer potential to be used in modern automotive headlights to meet the high requirements for tolerances and surface quality. A microform-fit joining approach is used to join plastics and metals, which combines the advantages of material-fit and form-fit joining processes while at the same time avoiding some of the disadvantages of the respective joining approaches, such as stress peaks or the use of additional chemicals. For this purpose, the light metal component is microstructured through laser ablation. To ensure the functional safety of electrical components, the media tightness of the hybrid component is tested with a pressure drop test. An influence of the structure arrangement, the structure spacing and the molding compound on the media tightness can be determined. The highest media tightness can be achieved with a ring-shaped structural arrangement in which the microstructures are orientated orthogonally to the outlet direction of the test medium. The media permeability of a ring-shaped structure arrangement with a structure spacing of 500 µm is 0.42 cm3/s for test specimens made of aluminum and polycarbonate. As the value is below the threshold value of 12 cm3/s, watertightness up to an overpressure of at least 0.5 bar can be concluded.

Abstract Image

微成型塑料/轻金属复合材料的介质密封性研究
由聚碳酸酯等无定形热塑性塑料和铝等轻金属制成的塑料/金属混合组件有望用于现代汽车前大灯,以满足对公差和表面质量的高要求。塑料和金属的接合采用了微成型接合方法,它结合了材料接合和成型接合工艺的优点,同时避免了各自接合方法的一些缺点,如应力峰值或使用额外的化学品。为此,可通过激光烧蚀对轻金属元件进行微结构处理。为确保电气元件的功能安全,混合元件的介质密封性通过压降试验进行测试。可以确定结构排列、结构间距和模塑化合物对介质密封性的影响。环形结构布置的介质密封性最高,其中微结构的方向与测试介质的出口方向正交。对于由铝和聚碳酸酯制成的测试样本,结构间距为 500 微米的环形结构布置的介质渗透率为 0.42 立方厘米/秒。由于该值低于 12 立方厘米/秒的临界值,因此可以断定在至少 0.5 巴的超压条件下不会漏水。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.10
自引率
9.80%
发文量
58
审稿时长
44 days
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