Abstract In this study, the tensile, flexural and fracture behavior of PEEK processed by fused filament fabrication (FFF) is reported. Three different configurations, viz., specimens built horizontally with a raster angle of 0° (H-0°) and 90° (H-90°), and vertically with a raster angle of 90° (V-90°) are examined. The best performing specimen in terms of its tensile, flexural and fracture toughness properties is H-0°, followed by H-90° and V-90°. The H-0° and H-90° specimens exhibit 85% and 75% of tensile and flexural strengths of molded bulk PEEK, respectively. The fracture toughnesses of the H-0° and H-90° specimens are 78% and 70% of molded bulk PEEK, respectively. However, V-90° specimens show lower tensile, flexural and fracture toughness properties compared to those of H-0°, H-90° and molded PEEK. The fracture surface and microtomography analyses indicate that the degree of interfacial bonding between beads during layer-by-layer buildup, is affected by the thermal gradient across the beads. The PEEK specimen configurations examined here have different thermal gradient in the build directions and such variations manifest themselves in their macroscopic mechanical behavior. The findings of this study provide guidelines for FFF of PEEK to enable its realization in applications such as orthopedic implants.

中文翻译：

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通过熔融沉积增材制造加工的生物相容性 PEEK 的性能

摘要 在这项研究中，报道了通过熔丝制造 (FFF) 加工的 PEEK 的拉伸、弯曲和断裂行为。三种不同的配置，即以 0° (H-0°) 和 90° (H-90°) 的光栅角水平构建的试样，以及以 90° (V-90°) 的光栅角垂直构建的试样. 就拉伸、弯曲和断裂韧性性能而言，性能最好的试样是 H-0°，其次是 H-90° 和 V-90°。H-0° 和 H-90° 试样的拉伸和弯曲强度分别为模塑散装 PEEK 的 85% 和 75%。H-0° 和 H-90° 试样的断裂韧性分别是模制散装 PEEK 的 78% 和 70%。然而，与 H-0°、H-90° 和模制 PEEK 相比，V-90° 试样的拉伸、弯曲和断裂韧性性能较低。断口和显微断层扫描分析表明，在逐层堆积过程中珠子之间的界面结合程度受珠子上的热梯度的影响。这里检查的 PEEK 试样配置在构建方向上具有不同的热梯度，这种变化体现在它们的宏观机械行为中。这项研究的结果为 PEEK 的 FFF 提供了指导方针，以使其在矫形植入物等应用中得以实现。