Direct microwave sintering of alumina in a single mode cavity: Magnesium doping effects
| Autor: | Jérémy Croquesel, Claude Carry, Sébastien Saunier, Didier Bouvard, Jean-Marc Chaix |
|---|---|
| Přispěvatelé: | Science et Ingénierie des Matériaux et Procédés (SIMaP ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Laboratoire Génie Physique et Mécanique des Matériaux, Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS), UMR 5146 - Laboratoire Claude Goux (LCG-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT) |
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Single-mode optical fiber Sintering 02 engineering and technology Ponderomotive force 021001 nanoscience & nanotechnology 01 natural sciences 7. Clean energy [SPI.MAT]Engineering Sciences [physics]/Materials Microwave sintering 0103 physical sciences Thermal Materials Chemistry Ceramics and Composites Direct heating Composite material 0210 nano-technology ComputingMilieux_MISCELLANEOUS Microwave Magnesium doping |
| Zdroj: | Journal of the European Ceramic Society Journal of the European Ceramic Society, Elsevier, 2018, 38 (4), pp.1841-1845. ⟨10.1016/j.jeurceramsoc.2017.12.010⟩ |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2017.12.010 |
| Popis: | Unexpected results have been obtained when comparing the densification behaviour of undoped and MgO-doped α and γ alumina powders in conventional and direct microwave heating. Although the densification starts at lower temperature under microwaves, the addition of MgO in the raw powder slows down the densification under microwaves. This leads to samples with a lower final density compared to undoped or conventionally heated samples after similar thermal cycles. These original results have been obtained realizing microwave sintering experiments by direct heating, in a 2.45 GHz single-mode cavity. The furnace allowed for an accurate control of the thermal cycle and for a continuous measurement of specimen dimensional changes. Direct comparison with conventional sintering has been achieved. These results are explained by the combination of the MgO effect on the alumina sintering behavior at low temperature generally reported under conventional heating and of a specific microwave effect linked to a ponderomotive force. |
| Databáze: | OpenAIRE |
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