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Open AccessArticle

New Feedstock System for Fused Filament Fabrication of Sintered Alumina Parts

by 1,2 and 1,2,*
1
Karlsruhe Institute of Technology, Institute for Applied Materials, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
2
Department of Microsystems Engineering, University Freiburg, Georges-Köhler-Allee 101, 79110 Freiburg, Germany
*
Author to whom correspondence should be addressed.
Materials 2020, 13(19), 4461; https://doi.org/10.3390/ma13194461
Received: 11 September 2020 / Revised: 29 September 2020 / Accepted: 30 September 2020 / Published: 8 October 2020
(This article belongs to the Section Manufacturing Processes and Systems)
Only a few 3D-printing techniques are able to process ceramic materials and exploit successfully the capabilities of additive manufacturing of sintered ceramic parts. In this work, a new two component binder system, consisting of polyethyleneglycol and polyvinylbutyral, as well stearic acid as surfactant, was filled with submicron sized alumina up to 55 vol.% and used in fused filament fabrication (FFF) for the first time. The whole process chain, as established in powder injection molding of ceramic parts, starting with material selection, compounding, measurement of shear rate and temperature dependent flow behavior, filament fabrication, as well as FFF printing. A combination of solvent pre-debinding with thermal debinding and sintering at a reduced maximum temperature due to the submicron sized alumina and the related enhanced sinter activity, enabled the realization of alumina parts with complex shape and sinter densities around 98 % Th. Finally the overall shrinkage of the printed parts were compared with similar ones obtained by micro ceramic injection molding. View Full-Text
Keywords: fused filament fabrication; 3D Printing; FFF/FDM; composites; ceramics; alumina fused filament fabrication; 3D Printing; FFF/FDM; composites; ceramics; alumina
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MDPI and ACS Style

Nötzel, D.; Hanemann, T. New Feedstock System for Fused Filament Fabrication of Sintered Alumina Parts. Materials 2020, 13, 4461. https://doi.org/10.3390/ma13194461

AMA Style

Nötzel D, Hanemann T. New Feedstock System for Fused Filament Fabrication of Sintered Alumina Parts. Materials. 2020; 13(19):4461. https://doi.org/10.3390/ma13194461

Chicago/Turabian Style

Nötzel, Dorit; Hanemann, Thomas. 2020. "New Feedstock System for Fused Filament Fabrication of Sintered Alumina Parts" Materials 13, no. 19: 4461. https://doi.org/10.3390/ma13194461

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