Influence of pulse current during Spark Plasma Sintering evidenced on reactive alumina–hematite powders
| Autor: | Claude Estournès, Vincent Bley, Geoffroy Chevallier, Christophe Laurent, Julien Gurt Santanach, Alicia Weibel, Alain Peigney |
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| Přispěvatelé: | Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Matériaux Diélectriques dans la Conversion d’Energie (LAPLACE-MDCE), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3) |
| Rok vydání: | 2011 |
| Předmět: |
Nanocomposite
Materials science Matériaux Diffusion Metallurgy Spark plasma sintering SPS Microstructure Hot pressing Fe-Al2O3 Cathode Nanocomposites law.invention [SPI]Engineering Sciences [physics] Chemical engineering law Electron microscopy Materials Chemistry Ceramics and Composites Current (fluid) Joule heating Spark Plasma Sintering |
| Zdroj: | Journal of the European Ceramic Society Journal of the European Ceramic Society, Elsevier, 2011, 31 (13), pp.2247-2254. ⟨10.1016/j.jeurceramsoc.2011.06.003⟩ |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2011.06.003 |
| Popis: | International audience; Spark Plasma Sintering (SPS) is increasingly used. The temperature and current are not independent parameters, making it difficult to separate the current intrinsic role from Joule heating. There is a debate on whether there are any specific SPS mechanisms. The influence of a key parameter, the (on:off) pulse pattern, is studied on the SPS of reactive α-Al2−2xFe2xO3 (x = 0.02; 0.05; 0.07; 0.10) powders. Changing it modifies the current crest intensity and has a great influence on the materials microstructure. Comparisons with runs where the current is blocked and hot-pressing reveal three competing phenomena: formation of FeAl2O4, dominant in the core and not peculiar to SPS, formation of Fe, producing Fe-Al2O3 composite surface layers, and most notably electrical-field induced diffusion of Fe3+ ions towards the cathode, which could have far-ranging implications for the consolidation of ionic materials and the in situ reactive shaping of composites and multimaterials. |
| Databáze: | OpenAIRE |
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