|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Multi-material Additive Manufacturing: Processing and Materials Design
||Extrusion of Direct-write Inks with Particle Gradients
||Leanne Friedrich, Matthew Begley
|On-Site Speaker (Planned)
Field-assisted positioning of microparticles in polymer matrices in direct write nozzles can produce structural and functional gradients both across and along printed filaments. Field-assisted microstructural control is most effective in matrices with lower viscosity than conventional direct-write inks. In this relatively unexplored space, both rheology and interfacial energy (wetting) influence filament deposition. Further, to maintain particle gradients established in the nozzle, flow rates need to be closer to raster speeds than conventional direct ink writing, increasing the risk that filaments will break into droplets. Here, we outline the scope of particle gradients and material systems that direct ink writing with acoustic fields can fabricate. We characterize the effects of interfacial energy, raster speed, flow speed, stand-off distance, and ink rheology on filament stability and the disruption of field-induced particle gradients during deposition. These results provide the foundation to identify requisite material properties and processing parameters for inks with designed microstructures.
||Planned: Supplemental Proceedings volume