Fused deposition modeling (FDM) has been successfully applied to fabricating short fiber reinforced polymer composites parts. However, due to the intrinsically limited mechanical properties of matrix polymers, there is critical need to develop fiber reinforced high-performance thermoplastic composites for FDM-3D printing to expand engineering applications. In this work, the potential of FDM-3D printing short carbon fiber (CF) and glass fiber (GF) reinforced high-performance PEEK composites has been investigated. Composite filaments with fiber contents of 5 wt%, 10 wt% and 15 wt% were prepared using extrusion process and characterized by micromorphology observation; and thermal properties testing demonstrated its better thermal stability than pure PEEK. The performance evaluation of printed CF/GF-PEEK parts was focused, including mechanical properties, microstructure, surface quality and porosity. The results indicate that the addition of CF/GF to PEEK can significantly enhance the tensile and flexural strength at the cost of ductility. Lower fiber content of 5 wt% is conducive to increasing mechanical properties, improving surface quality and reducing porosity of printed CF/GF-PEEK. GF/PEEK has better interfacial bonding than CF/PEEK due to the different surface treatments on fibers. Furthermore, microstructure observation suggests that fibers aligned along the printing orientation can strengthen the properties, while pores lead to performance degradation of 3D printed CF/GF-PEEK.

熔融沉积建模（FDM）已成功地应用于制造短纤维增强聚合物复合材料零件。但是，由于基体聚合物的固有力学性能受到限制，因此迫切需要开发用于FDM-3D打印的纤维增强高性能热塑性复合材料，以扩大工程应用范围。在这项工作中，已经研究了FDM-3D打印短碳纤维（CF）和玻璃纤维（GF）增强的高性能PEEK复合材料的潜力。纤维含量分别为5wt％，10wt％和15wt％的复合长丝采用挤压工艺制备，并通过微观形貌观察进行表征。热性能测试表明，其热稳定性优于纯PEEK。着重于印刷CF / GF-PEEK零件的性能评估，包括机械性能，微观结构，表面质量和孔隙率。结果表明，在PEEK中添加CF / GF可以显着提高拉伸强度和弯曲强度，但以延展性为代价。较低的5 wt％的纤维含量有助于提高机械性能，改善表面质量并降低印刷的CF / GF-PEEK的孔隙率。由于对纤维的表面处理不同，因此GF / PEEK具有比CF / PEEK更好的界面粘合性。此外，微观结构观察表明，沿着打印方向排列的纤维可以增强性能，而孔会导致3D打印的CF / GF-PEEK的性能下降。结果表明，在PEEK中添加CF / GF可以显着提高拉伸强度和弯曲强度，但以延展性为代价。较低的5 wt％的纤维含量有助于提高机械性能，改善表面质量并降低印刷的CF / GF-PEEK的孔隙率。由于对纤维的表面处理不同，因此GF / PEEK具有比CF / PEEK更好的界面粘合性。此外，微观结构观察表明，沿着打印方向排列的纤维可以增强性能，而孔会导致3D打印的CF / GF-PEEK的性能下降。结果表明，在PEEK中添加CF / GF可以显着提高拉伸强度和弯曲强度，但以延展性为代价。较低的5 wt％的纤维含量有助于提高机械性能，改善表面质量并降低印刷的CF / GF-PEEK的孔隙率。由于对纤维的表面处理不同，因此GF / PEEK具有比CF / PEEK更好的界面粘合性。此外，微观结构观察表明，沿着打印方向排列的纤维可以增强性能，而孔会导致3D打印的CF / GF-PEEK的性能下降。