This paper explores the characteristics of a new lightweight thermoplastic composite filament filled with hollow glass beads developed for material extrusion additive manufacturing. Compounding experiments, which mix hollow glass beads with neat acrylonitrile butadiene styrene matrix, were conducted using a twin-screw extruder to prepare composite filaments. Two different types of hollow glass beads were selected as the fillers of composite filament due to their varying densities. In order to characterize the final components produced using composite filament, various specimens were fabricated by a material extrusion additive manufacturing process. In order to characterize the physical properties of the specimens, measurements of density and flexural testing were performed. To identify the thermomechanical effects of hollow glass beads on the neat acrylonitrile butadiene styrene matrix, thermal diffusivity and specific heat were obtained. Consequently, the thermal conductivity of the specimen was derived from its density, thermal diffusivity, and specific heat capacity. The microstructures of the fractured interfaces of the specimens were also observed by scanning electron microscopy. The experimental results revealed that most of the hollow glass beads survived, thus bringing about lighter weight (lower density) and thermal insulation (lower thermal conductivity), which can be useful for numerous potential applications.

中文翻译：

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为材料挤出增材制造开发的中空玻璃珠填充热塑性复合长丝的制造和表征

本文探讨了为材料挤出增材制造而开发的填充空心玻璃珠的新型轻质热塑性复合长丝的特性。使用双螺杆挤出机进行复合实验，将空心玻璃珠与纯丙烯腈丁二烯苯乙烯基质混合，以制备复合长丝。由于密度不同，选择了两种不同类型的空心玻璃珠作为复合长丝的填料。为了表征使用复合长丝生产的最终部件，通过材料挤出增材制造工艺制造了各种样品。为了表征样品的物理特性，进行了密度测量和弯曲试验。为了确定空心玻璃珠对纯丙烯腈丁二烯苯乙烯基体的热机械影响，获得了热扩散率和比热。因此，样品的热导率来自其密度、热扩散率和比热容。还通过扫描电子显微镜观察了试样断裂界面的微观结构。实验结果表明，大多数中空玻璃珠幸存下来，从而带来更轻的重量（更低的密度）和隔热（更低的热导率），可用于许多潜在的应用。和比热容。还通过扫描电子显微镜观察了试样断裂界面的微观结构。实验结果表明，大多数中空玻璃珠幸存下来，从而带来更轻的重量（更低的密度）和隔热（更低的热导率），可用于许多潜在的应用。和比热容。还通过扫描电子显微镜观察了试样断裂界面的微观结构。实验结果表明，大多数中空玻璃珠幸存下来，从而带来更轻的重量（更低的密度）和隔热（更低的热导率），可用于许多潜在的应用。