Abstract Selective laser sintering (SLS) and Multi Jet Fusion (MJF) are two of the most developed powder bed fusion additive manufacturing techniques for the manufacture of polymeric components. In this work, a systematic benchmark and comparison of polyamide 12 (PA12) parts printed by SLS and MJF was conducted on the physicochemical characterization of raw powder materials (EOS PA2200 and HP 3D HR PA12) and their printed specimens, as well as the mechanical performance and printing characteristics of printed objects. Both designated-supply PA12 powders for each technique possessed almost identical thermal features, phase constitutions, functional groups, and chemical states. The mechanical strength of the MJF-printed specimens was slightly stronger than that of SLS-printed counterparts due to the synergistic effect of an area fusion mode and carbon black additive in the MJF process. The SLS-printed specimens had a better surface finish on the top surface, but the MJF-printed specimens showed much smoother front and side surfaces. Scaled-down merlions were printed by both processes for the printing accuracy assessment. The results show that the SLS-printed merlion presented higher profile deviations than those of the MJF-printed counterpart, especially in areas with sharp contours. These fundamental experimental results can provide a comprehensive understanding of SLS and MJF processes and serve as a valuable guideline for their industrial applications.

中文翻译：

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选择性激光烧结与多射流融合3D打印聚酰胺12的对比研究

摘要 选择性激光烧结 (SLS) 和多射流熔融 (MJF) 是两种最发达的粉末床熔融增材制造技术，用于制造聚合物部件。在这项工作中，对 SLS 和 MJF 打印的聚酰胺 12 (PA12) 零件进行了系统基准和比较，对原材料粉末材料（EOS PA2200 和 HP 3D HR PA12）及其打印样品的物理化学表征以及机械性能进行了比较。打印对象的性能和打印特性。每种技术的两种指定供应 PA12 粉末都具有几乎相同的热特性、相构成、官能团和化学状态。由于区域融合模式和碳黑添加剂在 MJF 工艺中的协同作用，MJF 打印试样的机械强度略强于 SLS 打印试样。SLS 打印的试样在顶面上具有更好的表面光洁度，但 MJF 打印的试样显示出更光滑的前表面和侧表面。两种工艺都打印了缩小的鱼尾狮，用于打印精度评估。结果表明，与 MJF 印刷的对应物相比，SLS 印刷的鱼尾狮呈现出更高的轮廓偏差，尤其是在轮廓清晰的区域。这些基本的实验结果可以提供对 SLS 和 MJF 过程的全面了解，并为其工业应用提供宝贵的指导。SLS 打印的试样在顶面上具有更好的表面光洁度，但 MJF 打印的试样显示出更光滑的前表面和侧表面。两种工艺都打印了缩小的鱼尾狮，用于打印精度评估。结果表明，与 MJF 印刷的对应物相比，SLS 印刷的鱼尾狮呈现出更高的轮廓偏差，尤其是在轮廓清晰的区域。这些基本的实验结果可以提供对 SLS 和 MJF 过程的全面了解，并为其工业应用提供宝贵的指导。SLS 打印的试样在顶面上具有更好的表面光洁度，但 MJF 打印的试样显示出更光滑的前表面和侧表面。两种工艺都打印了缩小的鱼尾狮，用于打印精度评估。结果表明，与 MJF 印刷的对应物相比，SLS 印刷的鱼尾狮呈现出更高的轮廓偏差，尤其是在轮廓清晰的区域。这些基本的实验结果可以提供对 SLS 和 MJF 过程的全面了解，并为其工业应用提供宝贵的指导。结果表明，与 MJF 印刷的对应物相比，SLS 印刷的鱼尾狮呈现出更高的轮廓偏差，尤其是在轮廓清晰的区域。这些基本实验结果可以提供对 SLS 和 MJF 过程的全面了解，并为其工业应用提供宝贵的指导。结果表明，与 MJF 印刷的对应物相比，SLS 印刷的鱼尾狮呈现出更高的轮廓偏差，尤其是在轮廓清晰的区域。这些基本的实验结果可以提供对 SLS 和 MJF 过程的全面了解，并为其工业应用提供宝贵的指导。