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Pattern Formation during Current Sintering


Densification and Coarsening

Pattern Formation during Current Sintering

Prof. Dr. Markus Winterer
Universität Duisburg-Essen
Lotharstraße 1
47057 Duisburg
Telefon: 0203 379-4446
Fax: 0203 379-4453
markus.winterer@uni-due.de
Prof. Dr. Dietrich Wolf
Universität Duisburg-Essen
Lotharstraße 1
47057 Duisburg
Telefon: 0203 379-3327/2816
Fax: 0203 379-1681
dietrich.wolf@uni-due.de
Proj.-Nr. WI 981/16-1Proj.-Nr. WO 577/13-1

The microstructural evolution during current sintering is investigated experimentally and theoretically for the case that the conductivity drops locally due to a reaction-diffusion process induced by the current. Aluminum-doped ZnO serves as a paradigm for this class of transport processes with negative feedback. The self-organized patterns that emerge due to this mechanism are being analyzed in dependence of the process parameters for thin films as well as for bulk samples. The possibility of manipulating the pattern formation e.g. by applying the current as a pulse sequence or by external cooling are explored. Potentially they will allow control of the micro-structure on length scales larger than grain or pore size in the green body.

Experiment (Al:ZnO)Simulation

Pattern FormationE = 0 V/m 900°C, 1h

Pattern FormationE > 0 V/m, CAPAD 900°C, 3 min

Pattern Formationelectrical power for digitized experimental configuration


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