Authors:
C. Kukla (1), V. Momeni (2), S. Schuschnigg (2), C. Holzer (2)
1- Montanuniversitaet Leoben, Research and Innovation Service, Leoben, Austria
2- Montanuniversitaet Leoben, Department of Polymer Engineering and Science, Institute of Polymer Processing, Leoben, Austria
Abstract:
The backbone plays a significant role in the binder system for FFF of metals. Since the backbone is degraded thermally, the temperature for this debinding step should be below the sintering temperature of the involved metal. Thus, the low degradation temperature makes PLA a proper candidate for the backbone in feedstocks for aluminium with a relatively low sintering temperature starting at about 550 °C. However, processing of PLA is challenging due to high shear and temperature sensitivity. Therefore, the printability at different nozzle temperatures (230, 250, 270 °C) was investigated for various formulations with PLA content ranging from 25 to 40 vol.% in the binder system. Solvent debinding for printed samples was conducted at room temperature and different immersion times. The results indicated the substantial impact of printing temperature on enhancing shape retention and preventing interlayer cracking during the solvent debinding process. The main binder was removed successfully without any defects during solvent debinding.
DOI:
https://doi.org/10.59499/EP246281505
