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Numerical model for sparking and plasma formation during spark plasma sintering of ceramic compacts

Marder, Rachel and Estournès, Claude and Chevallier, Geoffroy and Chaim, Rachman Numerical model for sparking and plasma formation during spark plasma sintering of ceramic compacts. (2015) Journal of Materials Science, vol. 50 (n°13). pp. 4636-4645. ISSN 0022-2461

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Official URL: http://dx.doi.org/10.1007/s10853-015-9015-z

Abstract

The conditions for spark discharge and plasma formation in non-conducting ceramic granular compacts subjected to spark plasma sintering (SPS) were analyzed. The SPS plungers-die-powder assembly was modeled, whereby a compact of spherical YAG nanoparticles was considered. Electric resistance of the simulated SPS assembly versus temperature was comparable to that of the experimental SPS system. The conditions for particle surface charging and discharge were determined with respect to the applied current, the SPS temperature, and duration. Sudden increase in the electric current through the simulated granular compact was observed around 1200°C, confirming the percolative nature of the current. This finding is in agreement with the experimental densification start at 1250°C. Moreover, the electric current percolation was simulated by passing a DC current through a modeled granular compact box, comprised of resistors and capacitors which resembled the particle’s surface resistivity and the inter-particle gaps, respectively. Spark discharge and plasma formation depend on connectivity within the granular compact and cease with the formation of a closepacked system.

Item Type:Article
Additional Information:Thanks to Springer editor. The definitive version is available at http://link.springer.com The original PDF of the article can be found at Journal of Materials Science website : http://link.springer.com/journal/10853.
Audience (journal):International peer-reviewed journal
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Technion – Israel Institute of Technology (ISRAEL)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:01 Feb 2017 10:21

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