Electrical characteristics of flash sintering: thermal runaway of Joule heating

By R. Todd, E. Zapata-Solvas, R. S. Bonilla, T. Sneddon, P. Wilshaw. 2015

387 citations recorded by the source corpus.

Abstract Flash sintering occurs when an electric field is applied to a heated ceramic powder compact. At a critical combination of field and temperature, a power surge occurs (the “flash event”) and sintering takes place in a few seconds. This paper investigates the possibility that this surge occurs by runaway Joule heating. The resistivity of 3YSZ was measured under the relevant conditions. To a good approximation, resistivity was found to be history-independent and to have the same temperature dependence before and after the flash event. These data were used to model the thermal and electrical response of 3YSZ to an applied electric field. All electrical characteristics of the flash event observed experimentally were predicted with a high degree of accuracy. It is concluded that the thermal and electric characteristics of flash sintering are a classical consequence of the negative temperature coefficient of resistivity leading to runaway Joule heating at constant voltage.

Subfields: Ceramics and Composites, Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/ea65f9c66114ed3a695b7974f2b1a5e4713dfae4

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In Ceramics and Composites

In Electrical and Electronic Engineering

In Materials Chemistry

Citations in the corpus

Thermal runaway, flash sintering and asymmetrical microstructural development of ZnO and ZnO–Bi2O3 under direct currents (2015, positive): “in a publication [38] that was submitted shortly after the initial submission of this manuscript, which we noted during the revision of this manuscript) without the need of introducing an avalanche of non-equilibrium defects, although some non-equilibrium defects may form after the onset of the flas”
Review of flash sintering: Materials, mechanisms and modelling (2017, methodology): “Relying on the surveyed literature, assuming that TS is about 1600°C for 3YSZ [13], the electroluminescence effect might be a weak effect compared to the incandescence effects.”
Decarbonising ceramic manufacturing: A techno-economic analysis of energy efficient sintering technologies in the functional materials sector (2019, background): “2 kV/cm applied to the samples through the wires [93].”