abstract
FLASH sintering is a field-assisted technique that allows the densification of ceramics in a few seconds at temperatures significantly lower than those of conventional cycles. There is still discussion among the scientific community about the mechanism behind this sintering process, that has been typically attributed to Joule heating, defect creation and movement or liquid phase assisted sintering. Computational modelling can be a powerful tool in helping to explain and predict this process. Using potassium sodium niobate (KNN) as a case study, a lead-free piezoelectric, this work explores Finite Element Modelling to evaluate the dependence of Joule heating generation and temperature distribution as a function of the cubic particle orientation.
keywords
THERMAL RUNAWAY; DENSIFICATION; ZIRCONIA; KINETICS; ZNO
subject category
Materials Science
authors
Serrazina, R; Vilarinho, PM; Senos, AMOR; Pereira, L; Reaney, IM; Dean, JS
our authors
Ana Maria de Oliveira e Rocha Senos
Collaborator
Paula Maria Lousada Silveirinha Vilarinho
Vice Director
Ricardo Serrazina
PhD Studentacknowledgements
The authors are grateful to the JECS Trust for funding the visit of Ricardo Serrazina to University of Sheffield (Contract No. 2018193). This work was also developed within the scope of the project CICECO-Aveiro Institute of Materials, FCT Ref. UID/CTM/50011/2019, financed by national funds through the FCT/MCTES. This work was also financed by Portugal 2020through European Regional Development Fund (ERDF), in the frame of Operational Competitiveness and Internationalization Programme (POCI), in the scope of the project FLASH sintering of lead free functional oxides towards sustainable processing of materials for energy and related applications -FLASH, POCI-01-0247-FEDER-029078. Ricardo Serrazina acknowledges FCTfor financial support (SFRH/PD/BD/128411/2017).