Riechmann Simon, Wunnicke Odo, Kwade Arno
Institut für Partikeltechnik, TU Braunschweig, Volkmaroder Str. 5, 38104 Braunschweig, Germany.
Evonik Operations GmbH, Creavis, Paul-Baumann-Str. 1, 45764 Marl, Germany.
Materials (Basel). 2021 Mar 3;14(5):1190. doi: 10.3390/ma14051190.
Binder jetting is known to produce porous objects by depositing the binder selectively layer by layer on a powder bed. In this study, the pore size of printed parts and the correlating mechanical properties are investigated on a commercially available PMMA powder binder system. Pore sizes are measured via capillary flow porometry and mechanical properties via tensile tests. Porometry indicates that the pore size stays at a constant level of 22 µm at 5 to 10 wt% binder loading before decreasing to 6 µm at loadings of 30 wt% or higher. The results were compared with the mechanical testing and related to the agglomerate strength model of Rumpf. The highlights of the article are the application of a binder jetted part as a filter and the identification of a close relationship between porosity and mechanical strength, similar to phenomena in agglomeration science.
粘结剂喷射成型是通过在粉末床上逐层选择性地沉积粘结剂来制造多孔物体。在本研究中，在一种市售的聚甲基丙烯酸甲酯粉末粘结剂体系上，对打印部件的孔径及其相关力学性能进行了研究。通过毛细管流动压汞法测量孔径，通过拉伸试验测量力学性能。压汞法表明，在粘结剂含量为5%至10%（重量）时，孔径保持在22微米的恒定水平，在粘结剂含量为30%（重量）或更高时，孔径降至6微米。将结果与力学测试进行了比较，并与伦普夫的团聚强度模型相关联。本文的亮点是将粘结剂喷射成型部件用作过滤器，以及确定孔隙率与机械强度之间的密切关系，这类似于团聚科学中的现象。
