Characterizing Binder-Powder Interaction in Binder Jetting Additive Manufacturing Via Sessile Drop Goniometry
Characterizing Binder-Powder Interaction in Binder Jetting Additive Manufacturing Via Sessile Drop Goniometry
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DOI：
10.1115/1.4041624
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发表时间：
2019-01-01
影响因子：
4
通讯作者：
Williams, Christopher B.
中科院分区：
文献类型：
--
作者：
Bai, Yun;Wall, Candace;Williams, Christopher B.
了解粘合剂-粉末相互作用和原始形成对于推进粘合剂喷射增材制造工艺和提高打印部件的精度、精度和机械性能至关重要。在这项工作中，作者提出了一种基于粉末基材上的固定式滴角测量的实验方法来表征粘合剂润湿粉末过程。当粘结剂滴入制备的粉末基材时，根据测量的粘结剂渗透时间计算粉末孔隙中形成的动态接触角，并从粉末基材中回收的粘结剂-粉末颗粒中测量粘结剂的渗透深度。结合毛细管流动模型，该技术提供了对粘合剂-粉末相互作用的基本理解，这种相互作用决定了粘合剂喷射过程中的材料相容性和打印参数。在此基础上，研究人员确定，悬浮在粘合剂中的纳米颗粒可以增加毛细管驱动的渗透深度，然后通过进一步增加纳米颗粒固体负载和粘合剂粘度来降低渗透深度。
Understanding the binder-powder interaction and primitive formation is critical to advancing the binder jetting Additive Manufacturing process and improving the accuracy, precision, and mechanical properties of the printed parts. In this work, the authors propose an experimental approach based on sessile drop goniometry on a powder substrate to characterize the binder wetting powder process. As a binder drop penetrates into a prepared powder substrate, the dynamic contact angle formed in powder pores is calculated based on the measured binder penetration time, and the binder penetration depth is measured from the binder-powder granule retrieved from the powder substrate. Coupled with models of capillary flow, the technique provides a fundamental understanding of the binder-powder interaction that determines the material compatibility and printing parameters in binder jetting. Enabled by this gained understanding, it was determined that suspending nanoparticles in a binder could increase the capillary-driven penetration depth, which was then reduced by the further increase of the nanoparticle solid loading and resultant binder viscosity.