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Finite-element modeling of the electro-thermal contacts in the spark plasma sintering process.pdf

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Finite-element modeling of the electro-thermal contacts in the spark plasma sintering process.pdf

Journal of the European Ceramic Society 36 (2016) 741–748 Contents lists available at Journal of the European Ceramic Society journal homepage: /locate/jeurceramsoc Finite-element modeling of the electro-thermal contacts in the spark plasma sintering process C. Manière a,b,c, A. Pavia a,b, L. Durand c, G. Chevallier a,b, K. Afanga a,b, C. Estournès a,b,? a Université de Toulouse, Institut Carnot Cirimat, UPS CNRS, Université Paul-Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 9, France b CNRS, Institut Carnot Cirimat, 118 route de Narbonne, 31602 Toulouse Cedex 9, France c Cemes, CNRS UPR 8011 et Université de Toulouse, 29 rue Jeanne Marvig, 31055 Toulouse, France article info Article history: Received 26 March 2015 Received in revised form 29 September 2015 Accepted 21 October 2015 Available online 11 November 2015 Keywords: Spark-plasma-sintering Electrical and thermal contact Papyex Finite element method abstract Spark plasma sintering (SPS) is a breakthrough process for powder consolidation assisted by pulsed current and uniaxial pressure. In order to model the temperature variations of the tools during a SPS cycle, the Graphite-Papyex-Graphite contact phenomena are studied experimentally and modeled by ?nite element calculations. Compared to conducting materials, the thermo graphic image of an insulating sample (alumina) shows strongly localized heating along the Papyex implying contact effects are predominant. The aim of this modeling study is to determine the main contact phenomena due to Papyex. It is based on numerous experimental data and studies the case of alumina sintering. Finally the contact model is confronted to experimental thermal images. ? 2015 Elsevier Ltd. All rights reserved. 1. Introduction Spark plasma sintering (SPS) is essentially a powder consolidation process assisted by pulsed current and uniaxial pressure. It allows sintering of refractory materials in few minutes instead of days by free sintering [1]. The main goal of the ther