For composites based on polypropylene (PP) filled with short carbon fibres (CF), extrusion-based additive manufacturing provides a promising and cost-effective manufacturing technique that utilises the flow-induced orientation of the fibres for their targeted alignment through the control of the printing direction. This study investigates the impact of the fibre orientation on mechanical properties and thermal conductivity of 3D-printed PP composites filled with short-CF. Provided a homogeneous fibre-dispersion and a good fibre-matrix adhesion, the composites showed considerably improved mechanical properties compared to neat PP regardless of the fibre orientation. However, for the different printing orientations, a strong anisotropy in terms of flexural and impact properties and thermal conductivity was observed. For example, it was found that the thermal conductivity along the printing and, thus, the fibre direction was three times higher than perpendicular to that direction. The present work provides a key to the fabrication of parts with tailored, orientation-dependent properties.

对于填充有短碳纤维（CF）的基于聚丙烯（PP）的复合材料，基于挤压的增材制造技术提供了一种有前途且具有成本效益的制造技术，该技术利用纤维的流致取向来控制纤维的定向排列。印刷方向。这项研究调查了纤维取向对填充短CF的3D打印PP复合材料的机械性能和导热性的影响。提供了均匀的纤维分散性和良好的纤维-基质粘合性，与纯PP相比，无论纤维取向如何，复合材料均显示出显着改善的机械性能。但是，对于不同的印刷方向，在挠曲和冲击性能以及热导率方面观察到强烈的各向异性。例如，已经发现，沿着印刷方向的热导率以及因此纤维方向的导热率是垂直于该方向的导热率的三倍。本工作为制造具有定制的，与方向相关的特性的零件提供了关键。