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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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Influence of Material and Processing Parameters on the Surface Roughness of Injection-Molded Ceramic Parts

S. Greiner1, K. Kurth1, C. Fix2, T. Braun3, J. Franke3, D. Drummer1

1 Institute of Polymer Technology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg
2
3 Institute for Factory Automation and Production Systems, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg

received Febuary 9, 2017, received in revised form Febuary 17, 2017, accepted March 16, 2017

Vol. 8, No. 2, Pages 277-286   DOI: 10.4416/JCST2017-00009

Abstract

Ceramic parts were prepared by means of injection molding and a two-step debinding and sintering process. For four different alumina ceramic feedstocks, the influence of processing parameters like holding pressure, injection speed, melt and mold temperature on the surface roughness was studied. The surface roughness was measured in the direction of flow and perpendicular to it with a tactile cantilever measuring system. A gradient in the surface roughness is detected along the flow path, which ended in a relatively coarse surface section. Smoother and more even surface structures can be generated with higher mold temperatures. In general, larger particle diameters cause greater surface roughness. Lower injection speed and melt temperature show similar effects. However, no significant effect was observed with regard to the holding pressure. Based on these results, the surface roughness could be adjusted in a certain range by changing material or processing parameters in order to fulfill the requirements of a subsequent metallization step.

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Keywords

Ceramic injection molding, surface roughness, ceramic feedstock, Al2O3 ceramics

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