3D-printed alumina-based ceramics with spatially resolved porosity

Serkan Nohut, Josef Schlacher, Irina Kraleva, Martin Schwentenwein, Raul Bermejo

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

Abstract

The interest on porous ceramics has increased in the last years with the developments in additive manufacturing methods, enabling design of components with complex geometries for membranes, filters, catalytic converters, or biostructures. In this study, porous alumina samples were produced by using different concentrations of poly(methyl methacrylate) (PMMA) as pore-forming agent (PFA) in a photocurable slurry via vat photopolymerization (VPP). The effect of layer thickness, PMMA particle size, and sintering temperature on the mechanical properties and microstructural features of the samples was investigated as a function of PMMA concentration. It is shown that the mechanical properties of 3D-printed porous alumina are comparable with those fabricated by conventional processes. The Young modulus, fracture toughness as well as the biaxial strength decreased with increasing weight concentration of PFA (resulting in an increased total porosity). Specially using smaller PMMA particles has a positive effect, resulting in higher Young's modulus as well as fracture toughness. The feasibility of VPP for fabricating novel parts with more complex porosity regions is explored by printing multi-material samples and porosity-graded architectures. The counterbalance effect between porosity and mechanical properties may be optimized by tailoring material composition and processing parameters.
OriginalspracheEnglisch
Seiten (von - bis)89-104
Seitenumfang16
FachzeitschriftInternational journal of applied ceramic technology
Jahrgang21.2024
Ausgabenummer1
DOIs
PublikationsstatusElektronische Veröffentlichung vor Drucklegung. - 16 Aug. 2023

Bibliographische Notiz

Funding Information:
This work is part of the Marie Skłodowska-Curie Individual Fellowship (H2020-MSCA-IF-2020) project entitled “GraCerLit–Development of Functionally Graded Ceramics by Lithography-based Ceramic Manufacturing (LCM)”. This project has received funding from the European Union's Horizon 2020 research and innovation programe under grant agreement No 101020104. Funding for this research was also provided by the European Research Council (ERC) excellent science grant “CERATEXT” through Horizon 2020 program under contract 817615. We gratefully acknowledge the support of Fraunhofer Institute for Computer Graphics Research IGD for the generation of layer images for the fabrication of porosity-graded alumina cube.

Funding Information:
This work is part of the Marie Skłodowska‐Curie Individual Fellowship (H2020‐MSCA‐IF‐2020) project entitled “GraCerLit–Development of Functionally Graded Ceramics by Lithography‐based Ceramic Manufacturing (LCM)”. This project has received funding from the European Union's Horizon 2020 research and innovation programe under grant agreement No 101020104. Funding for this research was also provided by the European Research Council (ERC) excellent science grant “CERATEXT” through Horizon 2020 program under contract 817615. We gratefully acknowledge the support of Fraunhofer Institute for Computer Graphics Research IGD for the generation of layer images for the fabrication of porosity‐graded alumina cube.

Publisher Copyright:
© 2023 Lithoz Gmbh and The Authors. International Journal of Applied Ceramic Technology published by Wiley Periodicals LLC on behalf of American Ceramics Society.

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