Potential for layer-less Additive Manufacturing with liquid precursor feedstocks
HUANG K. 1, DE MARZI A. 1, COLOMBO P. 1, FRANCHIN G. 1
1 Industrial Engineering Department, University of Padova, Padova, Italy
Additive manufacturing (AM) of ceramics from liquid precursor feedstocks has some advantages with respect to slurry-based feedstocks in which powders are present. Particularly, lower viscosity, enhanced transparency, and lack of scattering and sedimentation are advantageous features for vat photopolymerization processes, whereas the absence of particulates reduces clogging problems at the nozzle for extrusion-based processes. Moreover, these features unlock the use of novel AM technologies able to overcome the conventional layer-by-layer construction process and thus avoid the introduction of multiple interfaces and/or the requirement of sacrificial supports. Preceramic polymers are great candidates to explore the capabilities of liquid precursor feedstocks and produce ceramic components; here, we demonstrate their successful employment in a variety of techniques, including embedded direct ink writing, hybrid UV-extrusion robotic AM, two-photon polymerization, and xolography. The technology requirements and features are presented, toghether with the characterization and properties of the produced ceramic parts.