| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Journal of the American Ceramic Society Awards Symposium
|
| Presentation Title |
Direct Ink Writing (DIW) of Hierarchical Porous Alumina Stabilized Emulsions: Rheology and Printability |
| Author(s) |
George V. Franks, Shareen S. L. Chan, Mitchell L. Sesso |
| On-Site Speaker (Planned) |
George V. Franks |
| Abstract Scope |
Multiscale porous ceramics are produced by Direct Ink Writing (DIW) (3D printing) alumina pastes. Millimeter scale porosity is created by the 3D printed filaments. 20 micron scale porosity is introduced within the scaffold filaments by adding oil to the aqueous suspension to create pores via particle stabilized emulsions or capillary suspensions. Micron scale porosity is developed by partial sintering. The printed and sintered alumina lattices possess high overall porosity (78.7%) and open porosity (64.7%). The effects of formulation (surfactant and oil concentrations, particle size, and mixing) on rheology and pore size and morphology are presented. The rheological properties (storage modulus, yield stress) of the emulsions have been found to delineate samples with good shape retention from those that slump. The internal features of the sintered structures have been analyzed via X-ray tomography and SEM. Additional more recent work on the ultra-high temperature ceramic, zirconium diboride will be presented as well. |