Investigation of the mechanism(s) controlling microwave sintering of alpha-alumina: Influence of the powder parameters on the grain growth, thermodynamics and densification kinetics

Abstract : The objective of this investigation is to deepen the understanding of the mechanism(s) involved in densification and grain growth underlying microwave sintering of alpha-alumina. The densification behavior and microstructure evolution of alpha-alumina powders with different MgO doping levels as well as specific surface areas have been systematically and quantitatively studied during conventional and 2.45 GHz microwave multimode sintering. It is shown that the microwave-induced favorable effects on densification could be more important due to the existence of MgO dopant or a decrease of particle size. Combined with the thermodynamics and kinetics considerations, one assumed that grain-boundary diffusion could be significantly enhanced by microwave non-thermal effect. In addition, the grain growth retardation effect has been attributed to the fine porosity retention induced by microwave electromagnetic field, but not to the local over-heating at grain boundaries.
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Journal articles
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https://hal-emse.ccsd.cnrs.fr/emse-01145446
Contributor : Géraldine Fournier-Moulin <>
Submitted on : Friday, April 24, 2015 - 11:44:31 AM
Last modification on : Thursday, February 7, 2019 - 5:41:17 PM

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Fei Zuo, Sébastien Saunier, Sylvain Marinel, Pauline Chanin-Lambert, Nathalie Peillon. Investigation of the mechanism(s) controlling microwave sintering of alpha-alumina: Influence of the powder parameters on the grain growth, thermodynamics and densification kinetics. Journal of the European Ceramic Society, Elsevier, 2015, 35 (3), pp.959-970. ⟨10.1016/j.jeurceramsoc.2014.10.025 ⟩. ⟨emse-01145446⟩

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