Dresden 2017 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 34: Poster session II

MM 34.17: Poster

Tuesday, March 21, 2017, 18:30–20:30, P4

In-situ Electron Microscopy Studies of Electric Field Assisted Sintering of Oxide Ceramics — •Danny Schwarzbach, Max Steinbrück, and Cynthia A. Volkert — Institut für Materialphysik, Georg-August-Universität Göttingen

A wide range of studies show a dramatic effect of applied electric fields or currents on the sintering behavior of oxide ceramic powders. However, the mechanisms accounting for these strong effects remain elusive despite the wide application potential.

By using in-situ scanning and transmission electron microscopy, material changes during sintering of model oxide ceramics (e.g. ZnO) will be directly observed. The evolution of microstructure and morphology, including grain/void morphology, segregation, and precipitation, will be tracked, both with and without applied fields and currents. The results will be compared to models to determine the dominant driving forces and mechanisms for sintering, and how these are affected by fields and currents. In addition, in-situ high resolution and electron holography studies, EELS, and in-situ studies under oxidizing and reducing atmospheres will be used to gain insight into the atomic origins of sintering behavior, as well as of high conductivity states that occur in conjunction with flash events during field-assisted sintering.

Due to the fact that this project has just started, the focus of this poster is to present the above-mentioned methods and to provide an overview of the current state of research. Nevertheless, some initial results are already expected.

Support of SPP 1959 by the DFG is gratefully acknowledged.