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Influence of Manufacturing Parameters and Post Processing on the Electrical Conductivity of Extrusion-Based 3D Printed Nanocomposite Parts

机译：制造参数和后处理对基于挤压的3D打印纳米复合材料零件电导率的影响

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摘要

The influence of manufacturing parameters of filament extrusion and extrusion-based Additive Manufacturing (AM), as well as different post processing techniques, on the electrical conductivity of 3D printed parts of graphene nanoplatelets (GNP)-reinforced acrylonitrile butadiene styrene (ABS) has been analyzed. The key role of the manufacturing parameters to obtain electrically conductive filaments and 3D printed parts has been demonstrated. Results have shown that an increase in extrusion speed, as well as lower land lengths, induces higher extrudate swelling, with the consequent reduction of the electrical conductivity. Additionally, filaments with lower diameter values, which result in a higher surface-to-cross-section ratio, have considerably lower electrical conductivities. These factors tune the values of the volume and surface electrical conductivity between 10 –10 S/m and 10 –10 S/sq, respectively. The volume and surface electrical conductivity considerably diminished after 3D printing. They increased when using higher printing layer thickness and width and were ranging between 10 –10 S/m and 10 –10 S/sq, respectively. This is attributed to the higher cross section area of the individual printed lines. The effect of different post processing (acetone vapor polishing, plasma and neosanding, which is a novel finishing process) on 3D printed parts in morphology and surface electrical conductivity was also analyzed.
机译：长丝挤压和基于挤压的增材制造（AM）的制造参数以及不同的后处理技术对石墨烯纳米片（GNP）增强的丙烯腈丁二烯苯乙烯（ABS）的3D打印部件的电导率的影响分析。已经证明了制造参数对获得导电细丝和3D打印部件的关键作用。结果表明，挤出速度的提高以及较短的刃带长度会引起较高的挤出物溶胀，从而降低电导率。另外，具有较低直径值的细丝（其导致较高的表面截面积比）具有明显较低的电导率。这些因素将体积和表面电导率的值分别调整在10 –10 S / m和10 –10 S / sq之间。 3D打印后，体积和表面电导率大大降低。使用较高的印刷层厚度和宽度时，它们会增加，分别在10 –10 S / m和10 –10 S / sq之间。这归因于各个印刷线的较大的横截面积。还分析了不同的后处理（丙酮蒸气抛光，等离子和新砂光，这是一种新颖的精加工工艺）对3D打印零件的形态和表面电导率的影响。

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