Escano Luis I, Parab Niranjan D, Guo Qilin, Qu Minglei, Fezzaa Kamel, Everhart Wes, Sun Tao, Chen Lianyi
Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA.
Rev Sci Instrum. 2022 Apr 1;93(4):043707. doi: 10.1063/5.0076235.
In powder-bed-based metal additive manufacturing (AM), the visualization and analysis of the powder spreading process are critical for understanding the powder spreading dynamics and mechanisms. Unfortunately, the high spreading speeds, the small size of the powder, and the opacity of the materials present a great challenge for directly observing the powder spreading behavior. Here, we report a compact and flexible powder spreading system for in situ characterization of the dynamics of the powders during the spreading process by high-speed x-ray imaging. The system enables the tracing of individual powder movement within the narrow gap between the recoater and the substrate at variable spreading speeds from 17 to 322 mm/s. The instrument and method reported here provide a powerful tool for studying powder spreading physics in AM processes and for investigating the physics of granular material flow behavior in a confined environment.
在基于粉末床的金属增材制造（AM）中，粉末铺展过程的可视化和分析对于理解粉末铺展动力学及机制至关重要。不幸的是，高铺展速度、粉末的小尺寸以及材料的不透明性给直接观察粉末铺展行为带来了巨大挑战。在此，我们报道了一种紧凑且灵活的粉末铺展系统，用于通过高速X射线成像原位表征铺展过程中粉末的动力学。该系统能够在17至322毫米/秒的可变铺展速度下追踪再涂覆器与基板之间狭窄间隙内单个粉末的运动。本文报道的仪器和方法为研究增材制造过程中的粉末铺展物理以及研究受限环境中颗粒材料流动行为的物理提供了一个强大工具。
