Cellular MgAl2O4 spinels prepared by reactive sintering of emulsified suspensions


Emulsification of mixed precursor powder mixtures (Al2O3+MgCO3) and subsequent reactive firing were, for the first time, combined to prepare single phase cellular MgAl2O4 and corresponding MgxAl3-xO4 spinels with deviations, from ideal stoichiometry. Suspensions with 50% v/v solid load were emulsified in melted paraffin, with collagen additions to assist consolidation by gelcasting. Early burnout stages and firing conditions were adjusted to avoid collapse of green bodies on heating and to induce favorable microstructural changes, with emphasis on porosity and percolation. (C) 2015 Elsevier B.V. All rights reserved.




Materials Science; Physics


Vitorino, N; Freitas, C; Kovalevsky, AV; Abrantes, JCC; Frade, JR

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This work was developed in the scope of the project CICECO-Aveiro Institute of Materials (Ref. FCT UID /CTM /50011./2013, PTDC/CTM-ENE/2073/2012 and PEst-C/CTM/LA0011/2013, and Grants SFRH/BPD/99367/2013 and IF/00302/2012), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement.; SEM and XRD facilities were funded by FEDER Funds through QREN - Aviso SAIECT-IEC/2/2010, Operacao NORTE-07-0162-FEDER-000050.

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