ABSTRACT

Multi jet fusion (MJF) is an emerging powder three-dimensional (3D) printing technology with an ultrafast printing speed, in which polyamide 12 (PA12) is the main material currently utilised. Although structurally sophisticated 3D components have been printed by MJF, there are limitations due to the high cost of printing materials and inferior performance of the printed parts. Here, PA12/glass beads (PA12/GBs) composites with improved performance were manufactured via the MJF technique. Incorporating GBs effectively regulated the dimensional accuracy. Furthermore, the composite possessed lower surface roughness and higher surface hardness than neat PA12. Thermal analysis showed that the composite exhibited an enhanced decomposition temperature (390 °C) and char yield (38.4 wt.%) compared to neat PA12. Remarkably, the incorporation of GBs did not improve the flame retardance of neat PA12. We identified the improved functionalities of PA12/GBs composites in terms of dimensional accuracy, surface, and thermal properties and analysed possible mechanisms for the observed increased flammability.

摘要

多喷射融合（MJF）是一种新兴的粉末三维（3D）打印技术，具有超快的打印速度，其中聚酰胺12（PA12）是目前使用的主要材料。尽管 MJF 已经打印出结构复杂的 3D 组件，但由于打印材料成本高且打印部件性能较差，因此存在局限性。在这里，具有改进性能的 PA12/玻璃珠 (PA12/GBs) 复合材料是通过 MJF 技术制造的。结合GBs有效地调节了尺寸精度。此外，复合材料具有比纯 PA12 更低的表面粗糙度和更高的表面硬度。热分析表明，与纯 PA12 相比，复合材料表现出更高的分解温度 (390 °C) 和炭产率 (38.4 wt.%)。值得注意的是，GB 的加入并没有改善纯 PA12 的阻燃性。我们确定了 PA12/GBs 复合材料在尺寸精度、表面和热性能方面的改进功能，并分析了观察到的可燃性增加的可能机制。