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Estimating Joule heating and ionic conductivity during flash sintering of 8YSZ

Abstract : Sintering is a crucial processing step used in a wide variety of fields. Flash sintering is a recent technique to quickly density conductive ceramics in the presence of an electric field. Full densification can occur in seconds and at low temperatures. However, the mechanisms responsible for such extreme densification rates remain a matter of debate. We provide evidence that Joule heating sets off a chain of events resulting in flash sintering of 8% yttria-doped zirconia (YSZ). We show that prior to flash onset, Joule heating raises sample temperature relative to the thermal equilibrium established with the furnace. Flash sintering occurs once the sample temperature is high enough to cause densification. We derive an empirical model to estimate the conductivity of 8YSZ during flash sintering. We show that the model is equally valid under constant heating rate and in isothermal conditions, regardless of applied electric field strength.
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https://hal.archives-ouvertes.fr/hal-01308061
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Submitted on : Wednesday, April 27, 2016 - 11:01:05 AM
Last modification on : Friday, February 28, 2020 - 1:26:14 PM

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Yaxi Du, Adam J. Stevenson, Dorothée Vernat, Magaly Diaz, Daniel Marinha. Estimating Joule heating and ionic conductivity during flash sintering of 8YSZ. Journal of the European Ceramic Society, Elsevier, 2016, 36 (3), pp.749-759. ⟨10.1016/j.jeurceramsoc.2015.10.037⟩. ⟨hal-01308061⟩

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