Papers by Author: Jürgen Haußelt

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Authors: L. Merz, S. Rath, Volker Piotter, Robert Ruprecht, Jürgen Haußelt
Authors: Volker Piotter, L. Merz, Robert Ruprecht, Jürgen Haußelt
Authors: Hendrik C. Elsenheimer, Jan Tabellion, Florian Paul, Jürgen Haußelt
Abstract: The spatially distributed local electric field strength during the electrophoretic deposition (EPD) of alumina suspensions on a membrane is within the scope of the present article. The water-based alumina suspensions were optimized in order to achieve stable suspensions, high deposition rates and maximum green densities of the deposited bodies. In-situ measurements of the local potential drop inside the EPD-cell were carried out using a computer assisted process control set-up with electronic data acquisition. The behaviour of the spatial- and time-dependent electric field distribution was calculated from measured potential drops. The influence of varrying input voltages on the output parameters, such as deposition rate and green density for EPD on membranes was investigated and is discussed. It is shown that the distribution of the local electric field depends on the applied voltage and on time for the case of higher voltages. A dependance of the local electrical fields on the deposition rate is suggested as well.
Authors: Sylvia Bonnas, Jan Tabellion, Jürgen Haußelt
Abstract: By systematic interaction of sedimentation and electrical field in electrophoretic deposition the particle size distribution of the deposited green body can be influenced. This can be employed for producing coatings with a very smooth surface by deposition of only the nanosized fraction of a conventional powder with broad or non-monomodal size distribution, thus avoiding preceding classification. In this paper, the preparation of stabilised slurries is described focussing on the criteria particle size distribution, zeta-potential and sedimentation behaviour. The effectiveness of the interaction of sedimentation and electrophoretic deposition is to be shown.
Authors: Volker Piotter, G. Finnah, B. Zeep, Robert Ruprecht, Jürgen Haußelt
Abstract: To overcome the lack of micro manufacturing processes suitable for medium and large scale production as well as to process high resistive materials a special variant of micro injection molding is currently under development: micro powder injection molding (MicroPIM), which already enables the manufacturing of finest detailed components with structure sizes down to a few ten micrometer. In order to expand the scope of application of MicroPIM, tests are being conducted with pure tungsten powders or tungsten alloy powders. As further improvement, micro twocomponent injection molding allows, for example, the fabrication of micro components consisting of two ceramic materials with different physical properties.
Authors: Werner Bauer, Gunter Bartelt, Hans-Joachim Ritzhaupt-Kleissl, Jürgen Haußelt
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