Effects of local Joule heating during the field assisted sintering of ionic ceramics

Recent investigations regarding the role of applied fields on the grain growth and densification behavior of ionic ceramics are providing strong insights into the efficacy of Field Assisted Sintering Technique (FAST), aka Spark Plasma Sintering (SPS). Explanations of the observed behaviors, such as...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2012-11, Vol.32 (14), p.3667-3674
Main Authors: Holland, Troy B., Anselmi-Tamburini, Umberto, Quach, Dat V., Tran, Tien B., Mukherjee, Amiya K.
Format: Article
Language:English
Subjects:
Ceramics
Densification
Electrical conductivity
Grain growth
Grains
Joule heating
Necks
Sintering
Spark plasma sintering
SPS
Thermal conductivity
ZrO2
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Summary:Recent investigations regarding the role of applied fields on the grain growth and densification behavior of ionic ceramics are providing strong insights into the efficacy of Field Assisted Sintering Technique (FAST), aka Spark Plasma Sintering (SPS). Explanations of the observed behaviors, such as grain growth suppression and densification enhancement, are based upon the conjectured presence of a Joule heating driven temperature differential between grain interfaces and grain cores. These differentials were thought to be responsible for providing increased densification rates and lower densification temperatures through grain growth suppression and/or increased local kinetics at the forming necks. In this paper, we analyze the energetic, thermal, and practical details of this process in the context of the commonly accepted stages of sintering.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2012.02.033