Authors:
Abdolreza Simchi (Sharif University of Technology, Iran),
Frank Petzolfdt (Fraunhofer Institute IFAM, Germany),
Sebastian Boris Hein (Fraunhofer Institute IFAM, Germany),
Lea Reineke (Fraunhofer Institute IFAM, Germany),
Bastian Barthel (Fraunhofer Institute IFAM, Germany),
Daniel Hosseini (Sharif University of Technology, Iran)
Abstract:
Sintering anisotropy is the major challenge limiting the fabrication of large and complex-shaped parts by binder jet additive manufacturing. We employed 3D shell binder jetting to fabricate green parts with a minimum heterogeneity in the pore structure. The advantages of the process include fast printing speed, minimum consumption of the binder, easier de-powdering|de-binding processes, and homogeneous sintering shrinkage. The applicability of the shell printing process for the fabrication of 316L and Ti-6Al-4V parts is demonstrated. Using dilatometric analysis, we show that the sintering shrinkage in different directions only varies by about 1%; hence, deflection during high-temperature sintering is prohibited. The fine and uniform pore structure also renders reduced sintering temperature and time, yielding finer microstructural features and superior mechanical properties. The 3D shell printing could overcome the main limitations of the 3D binder jetting process; hence, it has a great potential to be employed for versatile materials systems.
DOI:
https://doi.org/10.59499/WP225371865