resumo
Iron oxides are attractive for a variety of applications, since they offer unique physical and chemical properties, while being abundant and environmentally friendly. Some of those potential applications, including electrochemical and catalytic systems, require ceramics with designed porosity and well-developed percolation networks. In the present work, representative Al- and Mg-substituted hematite and magnetite- based cellular ceramics were processed by emulsification of mixed oxide suspensions. Reactive firing conditions were adjusted to attain a reasonable compromise between designed porosity, percolation and phase composition. The impact of firing conditions on the cellular ceramics microstructure, porosity, phase content and interconnectivity of the cells was studied and discussed. Thus, the applicability of the proposed emulsification of ceramic suspensions method was demonstrated for iron oxide-based ceramics.
palavras-chave
ALPHA-FE2O3; PARAMETERS; REDUCTION; MONOLITHS; HEMATITE; SPINELS; DESIGN
categoria
Materials Science
autores
Lopes, DV; Kovalevsky, AV; Quina, MJ; Frade, JR
nossos autores
Andrei Kavaleuski
Investigador principal
Daniela Vanessa Rosendo Lopes
Investigador Júnior
Jorge Ribeiro Frade
Professor(a) Jubilado(a)agradecimentos
This work was supported by the Portuguese Fundacao para a Ciencia e Tecnologia (FCT) grants PD/BD/114106/2015 and IF/00302/2012, projects LEANCOMB (refs. 04/SAICT/2015, PTDC/CTM-ENE/2942/2014) and CICECO-Aveiro Institute of Materials (ref. UID/CTM/50011/2013), financed by COMPETE 2020 Programme and National Funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement. The authors are grateful to Artur Sarabando (University of Aveiro) for the assistance provided with the XRD analysis.