abstract
Porous 3 YTZ-Al2O3 membranes were processed aiming controlled cellular microstructures for potential sepa-ration and electrochemical applications. The processing method relies on emulsification of mixed suspensions of Al2O3 and 3 YTZ powders in sunflower oil. Taguchi experimental planning was used to seek guidelines for optimization of microstructural and structural characteristics, including porosity, phase composition and percolation of resulting membranes. Effects of alumina content, oil:suspension ratio, firing temperature and 2 step firing were evaluated by a correlation matrix and multivariate fitting. This analysis provided interpretation for prevailing effects on open and closed porosity, relative porosity loss during firing, and relevant micro structural and structural effects. The results demonstrate that the content of alumina plays key effects on partial transformation of tetragonal to monoclinic zirconia and on cell size. Percolation was analyzed by impedance spectroscopy, revealing that it is determined by series association of resistance to transport across the open cells and internal interfaces, ascribed to interruptions of open cell paths.
keywords
ZIRCONIA; ALUMINA; MONOLITHS; PERFORMANCE; COMPOSITE; FUTURE; WATER
subject category
Materials Science, Ceramics
authors
Ivanova, YA; Lopes, DV; Durana, E; Lisenkov, A; Frade, JR; Kovalevsky, AV
our authors
Aleksey Lisenkov
Junior Researcher
Andrei Kavaleuski
Principal Researcher
Daniela Vanessa Rosendo Lopes
Junior Researcher
Jorge Ribeiro Frade
Retired Professor
Yuliya Ivanova
Post-Doc FellowshipProjects
Collaboratory for Emerging Technologies, CoLab (EMERGING TECHNOLOGIES)
SusPhotoSolutions - Soluções Fotovoltaicas Sustentáveis (SUSPHOTOSOLUTIONS)
acknowledgements
This research was supported by the European Commission (project SIDERWIN-DLV-768788 - Horizon 2020/SPIRE10), and projects SusPhotoSolutions (Centro-01-0145-FEDER-000005) and CICECO-Aveiro Institute of Materials (UIDB/50011/2020 & UIDP/50011/2020) financed by national funds through the Portuguese Foundation for Science and Technology/MCTES. DVL also acknowledges her FCT grant PD/BD/114106/2015.