Abstract CF-PEEK composites were manufactured by 3D-printing using a novel FDM methodology and customized printer and were compared with their cast counterparts. The characterization of composite thermal properties in the range 25–300 °C revealed that 3D-printed CF-PEEK composites manifest 25–30% lower thermal conductivity than cast composites. Short carbon fibers used for reinforcement showed orientation along the polymer flow both in cast and 3-D printed samples causing the anisotropy of thermal properties. The hierarchical nature of 3DP CF-PEEK porosity was observed by SEM imaging, which allowed the identification of large scale inter-layer gaps and cracks, and fine scale intra-layer defects that are likely to be induced by the thermal and mechanical gradients within the deposit that arise during fabrication. Purposeful lay-up of long continuous carbon yarns during 3D-printing opens a way to fabricate tailored mechanical parts with desired anisotropy of properties.

中文翻译：

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3D 打印 PEEK-碳纤维 (CF) 复合材料：结构和热性能

摘要 CF-PEEK 复合材料是使用新型 FDM 方法和定制打印机通过 3D 打印制造的，并与其铸造对应物进行了比较。在 25-300°C 范围内对复合材料热性能的表征表明，3D 打印的 CF-PEEK 复合材料的热导率比铸造复合材料低 25-30%。用于加固的短碳纤维在浇铸和 3D 打印样品中都显示出沿聚合物流的取向，导致热性能的各向异性。通过 SEM 成像观察到 3DP CF-PEEK 孔隙率的分层性质，这允许识别可能由热梯度和机械梯度引起的大尺度层间间隙和裂缝以及细尺度层内缺陷。制造过程中产生的沉积物。