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Slurry-Based Powder Beds for the Selective Laser Sintering of Silicate Ceramics
T. Mühler1, C. Gomes2, M.E. Ascheri2, D. Nicolaides2, J.G. Heinrich1, J. Günster1,2
1 Institute of Non-Metallic Materials, Clausthal University of Technology, Zehntnerstrasse 2a, D-38678 Clausthal-Zellerfeld, Germany
2 BAM Federal Institute of Materials Research and Testing, Unter den Eichen 87, D-12205 Berlin, Germany
received February 6, 2015, received in revised form April 10, 2015, accepted April 24, 2015
Vol. 6, No. 2, Pages 113-118 DOI: 10.4416/JCST2015-00007
Abstract
Selective laser sintering of ceramic powders is a promising technique for the additive manufacturing of complex- and delicate-shaped ceramic parts. Most techniques have in common that the powder to be sintered is spread to a thin layer as a dry powder by means of a roller or shaker system. These layers have a relatively low density. On the other hand, appreciable densities can be reached with the use of ceramic slurries as the starting material. Therefore, the layer-wise slurry deposition (LSD) process has been developed. Layer stacks, i.e. powder beds, built up by employing the LSD technology exhibit a density comparable to ceramic powder compacts processed by means of conventional forming technologies. Writing the layer information with a focused laser beam in these dense ceramic powder compacts enables the manufacture of ceramic bodies with a high density and precision in contour.
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Keywords
LSD, powder bed, SLS, additive manufacturing, silicate ceramics
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