Abstract
Alumina-based, porous filter media was made via a binder jet 3D printing process consisting of an alumina powder printing step with subsequent heating, colloidal silica infiltration, drying, and sintering to consolidate particles yet retain a net open porous microstructure. The composites made were alumina-silica or alumina-mullite, where the silica sintering aid was used to densify and join the alumina particles. The resulting composite structures had open porosities in the 25–31 vol% range as measured by Archimedes density. Pressure drops were measured across the filter media at constant flow rates to compare disc shapes and complex, 3D printed filters based on the N95 design requirements. Complex, 3D-printed alumina composites were produced with acceptable pressure drops for N95 implementation.
| Original language | English |
|---|---|
| Pages (from-to) | 1960-1968 |
| Number of pages | 9 |
| Journal | International Journal of Applied Ceramic Technology |
| Volume | 18 |
| Issue number | 6 |
| DOIs | |
| State | Published - Nov 1 2021 |
Funding
The authors would like to acknowledge Tom Geer for his work with preparing samples for characterization. This research was sponsored by the Laboratory Directed Research and Development Program (LDRD) of Oak Ridge National Laboratory (ORNL), managed by UT-Battelle, LLC for the US Department of Energy under contract DE-AC05-00OR22725 and LOIS ID: 10100. This manuscript has been authored by UT‐Battelle LLC under Contract No. DE‐AC05‐00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non‐exclusive, paid‐up, irrevocable, world‐wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe‐public‐access‐plan ). The authors would like to acknowledge Tom Geer for his work with preparing samples for characterization. This research was sponsored by the Laboratory Directed Research and Development Program (LDRD) of Oak Ridge National Laboratory (ORNL), managed by UT‐Battelle, LLC for the US Department of Energy under contract DE‐AC05‐00OR22725 and LOIS ID: 10100.
Keywords
- alumina
- binder jet 3D printing
- colloidal silica
- infiltration
- mullite