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Deep Drawing of Ceramic Green Tapes – A Promising Technology for Producing New Lightweight Non-Planar Kiln Furniture
E. Schwarzer, U. Scheithauer, M. Brosche, H.-J. Richter, T. Moritz
Fraunhofer IKTS, Institute for Ceramic Technologies and Systems, Winterbergstrasse 28, D-01277 Dresden, Germany
received November 15, 2016, received in revised form January 11, 2017, accepted January 31, 2017
Vol. 8, No. 1, Pages 169-176 DOI: 10.4416/JCST2016-00106
Abstract
For the processing of ceramic green tapes to form 3D components, different technologies are known, for instance lamination to multilayer structures or folding. In the metals and plastics industries, deep drawing is, in addition to bending, a widely known method for reshaping sheet metals and polymers. This technology is not, however, applied for processing ceramic green tapes because of the downstream debinding and sintering steps. During the complex shaping process, the ceramic particles arranged within the polymer matrix become rearranged, which can result in inhomogeneous particle distribution. During sintering, this can lead to defects because of the resulting inhomogeneous shrinkage behavior. This study presents basic investigations into the deep drawing of ceramic green tapes. A special method was developed to investigate the particle distribution within the green tapes before and after the deep drawing and to correlate the results with the process conditions and the location of the investigated volume. One possible application for deep-drawn ceramic tapes could be as pre-product for non-planar kiln furniture. In combination with extruded pre-products, lamination, and co-sintering, large components with a low density and thermal mass can be produced with a top surface geometry similar to that of the sintered products.
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Keywords
Structural ceramic, tape casting, shaping, forming, deep drawing
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