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Slurry-Based Powder Beds for the Selective Laser Sintering of Silicate Ceramics

T. Mühler, C. Gomes, M.E. Ascheri, D. Nicolaides, J.G. Heinrich, J. Günster, J. Günster

Journal of Ceramic Science and Technology, Vol. 6, No. 2 (2015), pp. 113-118

DOI: 10.4416/JCST2015-00007

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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.

Keywords

LSD, powder bed, SLS, additive manufacturing, silicate ceramics

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