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Verfahren zur Herstellung eines keramischen Formkörpers

Producing ceramic molded article in form of denture, by providing suspension e.g. from powder composition by position-layer deposition of individual slurry layer and solidifying individual slurry layer area to construct the molded body
 
: Grzesiak, Andrzej; Graf, Careen; Visotschnik, R.; Refle, O.; Kraft, T.; Schaefer, R.; Ziegler, T.; Richter, H.-J.; Haderk, K.

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Frontpage ()

DE 102011117005 A1: 20111025
Deutsch
Patent, Elektronische Publikation
Fraunhofer IPA ()

Abstract
The method of producing a ceramic molded article in the form of a denture on the basis of a generative production process, comprises providing a suspension such as slurry from a powder composition by a position-layer deposition of individual, slurry layer (2) and solidifying an individual slurry layer area to construct the ceramic molded body, where the slurries: are different from the powder composition; are stored for forming the slurry layer; and are delivered next to each other in the form of single-droplet or linear-shaped slurry deposition based on a separation pattern. The method of producing a ceramic molded article in the form of a denture on the basis of a generative production process, comprises providing a suspension such as slurry from a powder composition by a position-layer deposition of individual, slurry layer (2) and solidifying an individual slurry layer area to construct the ceramic molded body, where the slurries: are different from the powder composition; are stored for forming the slurry layer; and are delivered next to each other in the form of single-droplet or linear-shaped local slurry deposition based on a predetermined separation pattern along one of the respective slurry layer attributable to a separator level. After separating the slurry layer, a first smooth layer surface is subjected to the position-layer deposition. A portion of the smoothed surface layer is applied to a liquid ink. Color pigments and/or the slurry layer contain a solidified material composition. The color pigments and the material compositions containing a solution are applied to a stationary partial region of the layer surface. A molded green body is: obtained after the separation of non-solidified slurry layer area from the solidified slurry layer area; and subjected to a sintering process for obtaining the molded article. The slurries with respect to their powder composition and/or concentration of the powder composition are selected such that both the slurries, after solidification and the sintering process, lead to form material microstructures having different mechanical properties. The powder composition contains a ceramic or glass ceramic, and a glass or metal. The droplet-shaped slurry has a diameter of 100-300 mu m, and the linear-shaped slurry deposition has a width of 100-300 mu m. The smooth layer surface for compressing a compression of the powder composition within the respective slurry is applied to the slurry layer. A shearing force is longitudinally orientated to the layer surface. The liquid ink and the material composition solidifying the slurry layer are applied by an inkjet printing technique in the form of isolated droplets having a diameter of less than 30 mu m on the layer surface. A second smooth layer surface is provided after applying the partial region of the smooth layer surface with the ink liquid to the layer surface.

: http://publica.fraunhofer.de/dokumente/N-270837.html