Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 105, Issue 10, Pages 6049-6062Publisher
WILEY
DOI: 10.1111/jace.18584
Keywords
computational materials science; FAST; finite element modeling; flash sintering; Joule heating; master sintering curve
Categories
Funding
- Department of Science and Technology, Government of India [DST/Inspire/04/2017/000548]
Ask authors/readers for more resources
This study assessed the role of Joule heating and thermal runaway on densification during flash sintering using both experimental and modeling approaches. The results showed that ultrafast densification observed during flash sintering cannot be explained solely by Joule heating and thermal runaway at low current density, but can be accounted for at higher current density.
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 (<100 mA/mm(2)), suggesting that a contribution from other mechanisms is likely essential to explain the observed ultrafast densification. However, Joule heating and thermal runaway can account for the ultrafast densification at higher than 100 mA/mm(2) current density.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available