Tough, Additively Manufactured Structures Fabricated with Dual-Thermoplastic Filaments
Tough, Additively Manufactured Structures Fabricated with Dual-Thermoplastic Filaments
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DOI：
10.1002/adem.201901184
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发表时间：
2019-12-17
影响因子：
3.6
通讯作者：
Wetzel, Eric D.
中科院分区：
文献类型：
--
作者：
Hart, Kevin R.;Dunn, Ryan M.;Wetzel, Eric D.
熔丝制造（FFF）是最常见的增材制造技术，但使用FFF制造的零件缺乏足够的机械完整性，无法满足大多数工程应用。本文中，使用新颖的热拉伸工艺制造包含具有星形聚碳酸酯（PC）芯的丙烯腈丁二烯苯乙烯（ABS）的双材料（DM）长丝。然后将该DM长丝用作传统FFF打印机的原料，以创建具有复合ABS/PC介观结构的3D实体。使这些部件经受介于ABS和PC的玻璃化转变温度之间的退火温度，产生具有与注塑成型ABS相当的延展性和比打印的ABS结构高15倍的断裂韧性值的固体。使用DM长丝制造的试样的PC骨架抵抗蠕变和聚合物松弛，以在退火期间保持精确的部件几何形状。这种新型DM长丝可以彻底改变增材制造，使低成本打印机能够生产出具有与注塑塑料竞争的机械性能的零件。
Fused filament fabrication (FFF) is the most common additive manufacturing technology, but parts fabricated using FFF lack sufficient mechanical integrity for most engineering applications. Herein, a dual material (DM) filament comprising acrylonitrile butadiene styrene (ABS) with a star-shaped polycarbonate (PC) core is fabricated using a novel thermal draw process. This DM filament is then used as feedstock in a conventional FFF printer to create 3D solid bodies with a composite ABS/PC meso-structure. Subjecting these parts to annealing temperatures intermediate between the glass-transition temperatures of ABS and PC produces a solid body with ductility comparable to injection-molded ABS and fracture toughness values 15 x higher than comparable as-printed ABS structures. The PC skeleton of specimens fabricated using the DM filament resists creep and polymer relaxation to maintain accurate part geometry during annealing. This novel DM filament can revolutionize additive manufacturing allowing low-cost printers to produce parts with mechanical properties competitive with injection-molded plastics.