2001 (and backfills for previous years) / DB reference years
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Author Risthaus-P; Gohring-D; Knitter-R
Source Key-Engineering-Materials. v 206-213 n I 2001, p 337-340; 7th Conference of the European Ceramic Society. Brugge, Belgium
Abstract To speed up the time from the idea to the finished ceramic component and to reduce the cost during product development various Rapid Prototyping techniques have been developed. From these, stereolithography is the best known and the most accurate and precise technique available to build a polymer prototype. For some applications, however, it is necessary to control not only the design but also the function of the prototypes. As Rapid Prototyping techniques for the fabrication of ceramic components are either still lacking a sufficient accuracy for micropatterned components or do not provide prototypes with the properties of conventionally fabricated ceramic components, a Rapid Prototyping Process Chain (RPPC) was applied to the development of a modular ceramic microreactor system left bracket 1 right bracket . This RPPC combines the rapid supply of precise polymer models by stereolithography with low-pressure ceramic injection moulding (LP-CIM). Due to the reduced process temperature and pressure in comparison to the better known high-pressure injection moulding, the demands on the tools are much lower, and it is possible to use polymer or even silicone rubber moulds as moulding tools. Furthermore, because of the much easier feedstock preparation it is possible to modify the feedstock for specific requirements. By a high solid content of the feedstock the shrinkage of the specimens can be minimised, thus reducing warping and cracking during binder burnout of relatively large parts, and the moulding especially of tiny parts with high aspect ratios can be improved. The total solid loading of the feedstocks and the density of the sintered parts could be increased by a new mixing technique, using a cryogenic mill for the preparation of LP-CIM feedstocks. 11 Refs. (Auth abstract) XX