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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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Porous Geopolymer Components through Inverse Replica of 3D Printed Sacrificial Templates

G. Franchin1, P. Colombo1,2

1 Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy
2 Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16801, USA

received December 29, 2014, received in revised form February 2, 2015, accepted February 26, 2015

Vol. 6, No. 2, Pages 105-112   DOI: 10.4416/JCST2014-00057

Abstract

Geopolymeric components with high controlled porosity were designed and produced by means of CAD/CAM and FDM (Fused Deposition Modeling) techniques. PLA sacrificial structures with different patterns were 3D printed with high accuracy and a geopolymeric slurry was used to produce close inverse replicas by means of impregnation in vacuum conditions and subsequent geopolymerization reaction and template removal in a combined chemical and thermal treatment. The FDM-manufactured sacrificial structures replicated the computationally designed porosity to be obtained in the final geopolymer components in terms of total porosity, average pore size and pore architecture. Geopolymer features were not affected by the fabrication route, and the process resulted in highly porous geopolymeric components with well-defined interconnected channels designed at both the macro- and microscopic scale. The specific surface area of the samples was ∼ 23 m2/g. The total porosity of the samples ranged from ∼ 66 to ∼ 71 vol%, given both by the designed geometrical macroporosity and by the inherent chemical micro- and meso-porosity of the geopolymer.

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Keywords

Geopolymers, solid freeform fabrication, fused deposition modeling, inverse replica, 3D printing

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