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Mechanism of flash sintering with high electric field: In the view of electric discharge and breakdown
Ist Teil von
Scripta materialia, 2020-10, Vol.187, p.93-96
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2020
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
‘Thermal runaway’ was the most popular mechanism in flash sintering, but this theory was inappropriate under high electric field. In this paper, we described electric discharge and breakdown phenomena in experiment to verify this point. And water moisture was found an important role in conducting electric discharge, that increasing moisture content of samples decreased the onset electric field of flash sintering and as low as 1628 V/cm of onset electric field was realized in this paper. With high electric field that can induce electric discharge in the sample, the flash sintering can be induced at room temperature and atmosphere.
With increasing electric field, discharge, sparks and arcs appeared continuously until the electric breakdown happened with flash sintering; moisture inside the sample intensified this process and reduce the onset electric field of flash sintering under high electric field. [Display omitted]