Additive Manufacturing of Ceramic-based Materials: Process Development, Materials, Process Optimization and Applications: Poster Session
Sponsored by: ACerS Basic Science Division, ACerS Engineering Ceramics Division, ACerS Manufacturing Division
Program Organizers: Lei Chen, University of Michigan-Dearborn; Xuan Song, University of Iowa; Xiangyang Dong, Arizona State University; Yiquan Wu, Alfred University; Paolo Colombo, University of Padova; Rajendra Bordia, Clemson University; Long-Qing Chen, Pennsylvania State University
Monday 5:00 PM
October 10, 2022
Room: Ballroom BC
Location: David L. Lawrence Convention Center
Session Chair: Lei Chen, University of Michigan-Dearborn
A-13: Evaluation of Reliability of Using Combined Rheological Methods for the Development of Ceramic Materials for 3D Printing: Francisco Lima1; Heitor Bernardo1; Valdecir Quarcioni2; Roberto Cesar de Oliveira Romano1; Rafael Pileggi1; 1University of Sao Paulo; 2Instituto de Pesquisas Tecnológicas
Ceramic 3D-printing is a computer-controlled additive manufacturing process in which material is extruded through a nozzle and deposited layer-by-layer to build products with defined properties according to desired geometric complexity and performance. The synergism between the fresh product and the 3D-printer is one of the most important stages of production. So, the development of printable ceramics needs to consider the adequate rheology of pastes. Yield stress, viscosity, viscoelasticity, and thixotropy, are some properties that must be correctly monitored. In this work, four extrudable clays were evaluated, as received, using the Benbow-Bridgwater, squeeze flow, and oscillatory rheometry methods. After that, the clays were printed in a Scara V4 3D printer, and the qualitative aspects of products were evaluated. The results obtained allowed us to correlate the rheological parameters and the quality of products, being possible to obtain a rheological profile to follow for the development of compositions made by different materials.
A-14: Nanomechanical Characterization of 3D Printed Ceramics: Bryan Regan1; Shuhan Zhang1; Nicole Ross2; Nicholas Voellm2; Ryan Fordham2; Shawn Allan2; Udo Schwarz1; Amit Datye1; 1Yale University; 2Lithoz
A common question in additive manufacturing (AM) is the ability to generate a uniform microstructure throughout parts. AM processes such as extrusion of a filament, jetting of materials or binders, and vat photopolymerization all buildparts layer by layer. However, after ceramic parts are printed, they must be heated in a furnace to remove any binder, and to consolidate the part through sintering, into a final ceramic. The printing and the heating processes may introduce both defects and non-uniformities. The goal of this project is to validate the uniformity of the material properties for 3D printed alumina and zirconia samples made by a lithography-based printing method. To accomplish this, the effective elastic modulus and hardness of small sections of the sample will be tested using nanoindentation. Hundreds of indentations will be made in various regions of the sample to verify that the modulus and hardness are consistent throughout the material.
A-15: Rheological Study of 3D Printable All-inorganic Thermoelectric Inks for Direct Writing of Micro-thermoelectric Generator: Han Gi Chae1; 1Ulsan National Institute of Science and Technology
To improve the performance and efficiency of the TE generator, 3d printing methods for TE materials are applied to create suitable geometries for heat sources. In this study, to attain high-quality 3D printing of TE inorganic materials, inorganic ionic binders have been used to achieve mild viscoelasticity in colloidal inks and perform layer-wise deposition of 3D TE structures without any degradation of TE performance. We analyzed the rheological properties of the BiTe-based TE inorganic inks to evaluate printability, thixotropy, and structure shape retention after printing regarding the properties of TE particles and binders to include the strong electrostatic interactions by various and comprehensive rheological analysis such as structural deformation parameters via three-interval thixotropy test (3ITT). The optimized printing inks can be directly written into complex architectures having a high aspect ratio. These printed micro-thermoelectric generators have exhibited large temperature gradients and a power density of 479.0 μW cm–2.