Control of the γ-alumina to α-alumina phase transformation for an optimized alumina densification
In: ISSN: 0366-3175 ; Boletín de la Sociedad Española de Cerámica y Vidrio ; https://hal.science/hal-01804220 ; Boletín de la Sociedad Española de Cerámica y Vidrio, 2017, 56 (2), pp.47-54. ⟨10.1016/j.bsecv.2016.10.001⟩, 2017
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Zugriff:
cited By 6 ; International audience ; In this work, we studied the aptitude to sintering green bodies using γ-Al2O3 transition alumina as raw powder. We focused on the influence of the heating rate on densification and microstructural evolution. Phase transformations from transition alumina γ → δ → θ → α-Al2O3 were studied by in situ X-rays diffraction from the ambient to 1200 °C. XRD patterns revealed coexistence of various phase transformations during the heating cycle. DTA and dilatometry results showed that low heating rate leads to a significant reduction of the temperature of the α-Al2O3 alumina formation. Around 1190, 1217 and 1240 °C were found when using 5, 10 and 20 °C/min of heating rate, respectively. The activation energy for θ-Al2O3 → α-Al2O3 transformation calculated by Kissinger and JMA equations using dilatometry method were 464.29 and 488.79 kJ/mol, respectively and by DTA method were 450.72 and 475.49 kJ/mol, respectively. In addition, the sintering of the green bodies with low heating rate promotes the rearrangement of the grains during θ-Al2O3 → α-Al2O3 transformation, enhancing the relative density to 95% and preventing the development of a vermicular structure. © 2016 SECV.
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Control of the γ-alumina to α-alumina phase transformation for an optimized alumina densification
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Autor/in / Beteiligte Person: | Lamouri, Samir ; Hamidouche, M. ; Bouaouadja, Noureddine ; Belhouchet, H. ; Garnier, Vincent ; Fantozzi, Gilbert ; Trelcat, Jean-François ; Laboratoire des Matériaux Non Métalliques ; Université Ferhat-Abbas Sétif 1 Sétif (UFAS1) ; Matériaux, ingénierie et science Villeurbanne (MATEIS) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon) ; Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS) ; Laboratoire des Matériaux Céramiques et Procédés Associés - EA 2443 (LMCPA) ; Université de Valenciennes et du Hainaut-Cambrésis (UVHC) |
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Zeitschrift: | ISSN: 0366-3175 ; Boletín de la Sociedad Española de Cerámica y Vidrio ; https://hal.science/hal-01804220 ; Boletín de la Sociedad Española de Cerámica y Vidrio, 2017, 56 (2), pp.47-54. ⟨10.1016/j.bsecv.2016.10.001⟩, 2017 |
Veröffentlichung: | HAL CCSD ; Elsevier, 2017 |
Medientyp: | academicJournal |
DOI: | 10.1016/j.bsecv.2016.10.001 |
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