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Materials 2017, 10(2), 179; doi:10.3390/ma10020179

Particle Surface Softening as Universal Behaviour during Flash Sintering of Oxide Nano-Powders

Department of Materials Science and Engineering, Technion—Israel Institute of Technology, Haifa 32000, Israel
Academic Editor: Jai-Sung Lee
Received: 14 December 2016 / Revised: 29 January 2017 / Accepted: 8 February 2017 / Published: 14 February 2017
(This article belongs to the Section Manufacturing Processes and Systems)
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Abstract

The dissipated electric power in oxide powder compacts, subjected to flash sintering, is several hundreds of W·cm−3. This power is analyzed considering local softening/melting and transient plasma/liquid formation at the particle contacts due to thermal runaway. The sudden increase in compact electric conductivity and dissipated power referred to current percolation through the softening/liquid formed at the particle contacts, at the percolation threshold. The energy-balance and heat transfer considerations during the transient flash event are consistent with the local heating of the nanoparticle contacts to the ceramic melting temperature, or above it. The formation of the plasma by field emission of electrons is also considered. View Full-Text
Keywords: flash sintering; spark plasma sintering; densification; plasma; electric field; invasive percolation; nano-powders; oxides flash sintering; spark plasma sintering; densification; plasma; electric field; invasive percolation; nano-powders; oxides
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chaim, R. Particle Surface Softening as Universal Behaviour during Flash Sintering of Oxide Nano-Powders. Materials 2017, 10, 179.

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