Flash microwave sintering of zirconia by multiple susceptors cascade strategy
Résumé
In the field of flash sintering, microwave energy represents an interesting way to densify ceramics complex shapes, thanks to a contactless volumetric heating. Attaining a fast and homogeneous heating is a critical parameter and hybrid heating, using silicon carbide susceptors, is generally used. In this study, an original multiple susceptors cascade strategy is developed, using both SiC and 3D-printed ZrO2 susceptors. This novel configuration follows perfectly the flash heating scheme, even for high heating rates up to 1000 K.min-1 and leads to a high stability of the "flash" hybrid heating. Flash microwave sintering produced dense (97% relative density) microstructures within 45 s. Based on comprehensive multiphysics simulations of the overall process, in-situ dilatometry measurements, kinetics method analysis and microstructural characterizations, this work highlights the sintering behavior of zirconia and the temperature distribution during flash microwave sintering.
Domaines
MatériauxOrigine | Fichiers produits par l'(les) auteur(s) |
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