Development of an instrumented and automated flash sintering setup for enhanced process monitoring and parameter control

Heterogeneous grain size distributions due to cathodic reduction of samples sintered by flash sintering (FS) are a recurring problem. Herein, we present an experimental setup for FS with refined control of the process parameters, especially the electric current density, to control the power peak tha...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2019-02, Vol.39 (2-3), p.531-538
Main Authors: Campos, João Vitor, Lavagnini, Isabela Reis, Sousa, Rafael Vieira de, Ferreira, Julieta Adriana, Pallone, Eliria Maria de Jesus Agnolon
Format: Article
Language:English
Subjects:
3YSZ
Field-assisted sintering technique
Multi step flash sintering
Zirconia
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Summary:Heterogeneous grain size distributions due to cathodic reduction of samples sintered by flash sintering (FS) are a recurring problem. Herein, we present an experimental setup for FS with refined control of the process parameters, especially the electric current density, to control the power peak that could reduce the grain size heterogeneity of sintered materials. The real-time control of the equipment enabled the development of a Multi-Step Flash Sintering (MSFS) process. This technique involves varying the maximum current density at the onset of the abrupt shrinkage of the sample during the flash phenomenon, smoothing the shrinkage and power density curves, avoiding power peak and allowing its control in real time. Tetragonal stabilised zirconia (3YSZ) was sintered in this equipment by both FS and MSFS. Preliminary results of this study were promising in terms of density control and improvement of grain size homogeneity.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2018.09.002