|About this Abstract
||MS&T21: Materials Science & Technology
||Additive Manufacturing of Ceramic-based Materials: Process Development, Materials, Process Optimization and Applications
||Direct-Ink-Writing and Cold-Sintering of ZnO Ceramics
||Russell A. Maier, Igor Levin, Lawrence Friedman, Andrew Allen, Abhay Goyal, Nicos S. Martys
|On-Site Speaker (Planned)
||Russell A. Maier
Efforts are underway at NIST to develop computer modeling tools and standardized experimental methods for characterizing critical steps of direct-ink-writing (DIW) of ceramic materials. Current research focuses on a model system of colloidal ZnO suspensions. We are synthesizing ZnO particles from solution to develop slurries that contain monodispersed and bimodal suspensions of spherical particles to promote green-body packing density and improve the sinterability of printed parts. Concurrently, we are developing computational methods that combine Discrete Element Method (DEM) and multi-phase Computational Fluid Dynamics (CFD) to model DIW printability using the knowledge of particle size/morphology, rheological properties of the slurry, interparticle forces, and physical properties of an extruder. The recently invented cold sintering process permits ZnO densification at temperatures that are an order of magnitude lower than those used in traditional sintering. We are working to understand the physical mechanisms of cold sintering, as required for its effective integration with DIW.