Investigation on the role of Joule heating on flash sintering using a combined experimental and modeling approach

Flash sintering is a novel technique of ultrafast densification. There is a continuous debate over the mechanisms that are responsible for such fast sintering. In this work, we have assessed the role of Joule heating and thermal runaway on densification using a combined experimental and modeling app...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2022-10, Vol.105 (10), p.6049-6062
Main Authors: Arya, Kumar Sadanand, Eqbal, Ammar, Rai, Pranav, Yadav, Devinder, Chakrabarti, Tamoghna
Format: Article
Language:English
Subjects:
computational materials science
Continuous sintering
Current density
Densification
FAST
Finite element method
finite element modeling
flash sintering
Joule heating
Low currents
master sintering curve
Mathematical models
Modelling
Ohmic dissipation
Resistance heating
Resistance sintering
Sintering
Thermal runaway
Titanium dioxide
Yttrium oxide
Zirconium dioxide
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Summary:Flash sintering is a novel technique of ultrafast densification. There is a continuous debate over the mechanisms that are responsible for such fast sintering. In this work, we have assessed the role of Joule heating and thermal runaway on densification using a combined experimental and modeling approach. First, flash sintering (FS) experiments have been carried out for three different oxides that have very different electrical and thermal conductivities, namely, 3‐ and 8‐mol% yttria‐stabilized zirconia and titania (TiO2). Then, we modeled the densification during FS, for identical experimental conditions, using a novel combined finite element modeling and master sintering curve approach. The results obtained through experiment and modeling have been compared. Finally, our results show that ultrafast densification observed during FS cannot be replicated through Joule heating and thermal runaway alone at low current density (
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.18584