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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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Selective Laser Sintering as an Additive Manufacturing Method for Manufacturing Ceramic Components

M. Ahlhelm, H.-J. Richter, K. Haderk

Fraunhofer Institute for Ceramic Technologies and Systems (IKTS) Winterbergstrasse 28, 01277 Dresden, Germany

received June 29, 2012, received in revised form November 19, 2012, accepted December 03, 2012

Vol. 4, No. 1, Pages 33-40   DOI: 10.4416/JCST2012-00024

Abstract

Selective Laser Sintering (SLS) offers the advantage of directly manufacturing complex-shaped parts without the uneconomic loss of material so common when conventional manufacturing methods are applied. Originating from the laser sintering of polymers, lots of research has been conducted on advanced materials like metals and ceramics. In recent years the Fraunhofer IKTS has conducted research on the laser sintering of SiC and different hydroxyapatite (HAp) powders. The HAp powders have been characterized based on their laser sintering ability with the variation of process parameters like spreading behavior, different grain shape and size, hatch clearance, etc. More elaborate research has been conducted concerning the laser sintering of SiSiC components. After infiltration and pyrolysis of laser-sintered SiC parts, the resulting SiSiC components showed similar mechanical characteristics to those of conventionally processed SiSiC components. Different complex geometries were realized e.g. a 120-mm honeycomb-structured mirror support model (wall thickness of 1 mm, for aerospace applications) and a small turbine rotor (minimal wall thickness of 0.3 mm) as a demonstrator part for automotive components. A laser mirror with integrated cooling channels for application in movable beam arms for laser material processing was also manufactured. Another successfully generated SiSiC component is an injection molding tool insert (ca. 35 x 30 mm; diameter x height) with a complex-structured surface and inner cooling channels. The next steps will be towards research dealing with more complex designs and other ceramics as well as metal-ceramic hybrids.

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Keywords

Selective Laser Sintering (SLS), ceramic, silicon carbide, hydroxyapatite

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