Alumina-based filters made via binder jet 3D printing of alumina powder, colloidal silica infiltration, and sintering

Cramer, Corson; Armstrong, Beth L.; Trofimov, Artem; Wang, Peter; Siddel, Derek; Wang, Hsin; Cakmak, Ercan; Klett, James; Elliott, Amy

doi:10.1111/ijac.13852

Title: Alumina-based filters made via binder jet 3D printing of alumina powder, colloidal silica infiltration, and sintering

Journal Article · 19 August 2021 · International Journal of Applied Ceramic Technology

DOI: https://doi.org/10.1111/ijac.13852 · OSTI ID:1817563

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^[1]; Wang, Peter ^[1]; Siddel, Derek ^[1];

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1817563

Journal Information:: International Journal of Applied Ceramic Technology, Journal Name: International Journal of Applied Ceramic Technology Journal Issue: n/a Vol. n/a; ISSN 1546-542X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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