abstract
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.
keywords
MICROWAVE-ASSISTED COMBUSTION; POWDER
subject category
Materials Science; Physics
authors
Vitorino, N; Freitas, C; Kovalevsky, AV; Abrantes, JCC; Frade, JR
our authors
Andrei Kavaleuski
Principal Researcher
João Carlos de Castro Abrantes
Professor Adjunto
Jorge Ribeiro Frade
Full professor
Nuno Miguel Dias Vitorino
Post-doc FellowshipProjects
THERMICS- Cellular PCM-based composites with enhanced thermal conduction and shape stabilization (PTDC/CTM-ENE/2073/2012)
Centre for Research in Ceramics and Composite Materials - CICECO (LA0011: 2013-2014) (PEst-C/CTM/LA0011/2013)
acknowledgements
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.