Journal of Materials Science

, Volume 53, Issue 9, pp 6378–6389 | Cite as

On thermal runaway and local endothermic/exothermic reactions during flash sintering of ceramic nanoparticles

Ceramics
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Abstract

Numerical analysis of the heat balance at the flash event during flash sintering of granular ceramic nanoparticles was performed assuming continuum solid state as well as simultaneous surface softening/liquid formation and current percolation through the nanoparticle contacts. Assuming inter-particle radiations in the specimen volume, the electric Joule heat generated at the nanoparticle contacts partially lost by radiation from the specimen external surfaces. Considering the thermal effects due to rapid heating rate and free-molecular heat conduction regime, high-temperature gradients between the nanoparticle surfaces and the surrounding gas were developed. The attractive capillary forces, induced by the particle surface softening/liquid at the percolation threshold, lead to rapid rearrangement and densification of the nanoparticles. The excess Joule heat, already at the flash event, suffices the excess internal heat that is necessary for partial or full melting. Particle surface softening/liquid formation is a transient process, hence followed by crystallization immediate after the nanoparticle rearrangement. Thermal runaway is associated with local surface softening/melting and its solidification.

Notes

Acknowledgements

R. Chaim acknowledges the warm and kind hospitality of the colleagues from CIRIMAT during his sabbatical stay in Toulouse, where this paper was prepared. We thank Dr. Rachel Marder for kindly providing the Fig. 4.

Compliance with ethical standards

Conflict of interest

All authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringTechnion – Israel Institute of TechnologyHaifaIsrael
  2. 2.Université de Toulouse, CIRIMAT, CNRS INPT UPS, Université Paul-SabatierToulouse Cedex 9France

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