Spark plasma sintering of a commercially available granulated zirconia powder: Comparison with hot-pressing |
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| Authors: | Guillaume Bernard-Granger Ahmed Addad Gilbert Fantozzi Guillaume Bonnefont Christian Guizard Dorothée Vernat |
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| Affiliation: | 1. Laboratoire de Synthèse et Fonctionnalisation des Céramiques, UMR 3080 CNRS/Saint-Gobain, Saint-Gobain CREE, 84306 Cavaillon Cedex, France;2. Laboratoire de Structure et Propriétés de l’Etat Solide, UMR 8008 CNRS, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq Cedex, France;3. Laboratoire MATEIS, UMR 5510 CNRS, Institut National des Sciences Appliquées de Lyon, 69621 Villeurbanne Cedex, France |
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| Abstract: | A commercially available granulated TZ3Y powder has been sintered by hot-pressing (HP). The “grain size/relative density” relationship, referred to here as the “sintering path”, has been established for a constant value of the heating rate (25 °C min?1) and a constant value of the macroscopic applied pressure (100 MPa). It has then been compared to that obtained previously on the same powder but sintered by spark plasma sintering (SPS, heating rate of 50 °C min?1, same applied macroscopic pressure). By coupling the analysis of a sintering law (derived from creep rate equations) and comparative observations of sintered samples using transmission electron microscopy, a hypothesis about the densification mechanism(s) involved in SPS and HP has been proposed. Slight differences in the densification mechanisms lead to scars in the microstructure that explain the higher total ionic conductivity measured, in the temperature range 300–550 °C, when SPS is used for sintering. |
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