TY - JOUR

T1 - 3D-printed alumina-based ceramics with spatially resolved porosity

AU - Nohut, Serkan

AU - Schlacher, Josef

AU - Kraleva, Irina

AU - Schwentenwein, Martin

AU - Bermejo, Raul

N1 - 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.

PY - 2024

Y1 - 2024

N2 - 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.

AB - 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.

KW - additive manufacturing

KW - alumina

KW - mechanical properties

KW - pores/porosity

KW - Vat photopolymerization

UR - http://www.scopus.com/inward/record.url?scp=85169101918&partnerID=8YFLogxK

UR - https://pureadmin.unileoben.ac.at/portal/en/publications/3dprinted-aluminabased-ceramics-with-spatially-resolved-porosity(a60e82f6-be5b-42b5-8d44-28b3f6d8f656).html

U2 - 10.1111/ijac.14512

DO - 10.1111/ijac.14512

M3 - Article

AN - SCOPUS:85169101918

VL - 21.2024

SP - 89

EP - 104

JO - International journal of applied ceramic technology

JF - International journal of applied ceramic technology

SN - 1546-542X

IS - 1

ER -