resumo
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.
palavras-chave
ZIRCONIA; ALUMINA; MONOLITHS; PERFORMANCE; COMPOSITE; FUTURE; WATER
categoria
Materials Science, Ceramics
autores
Ivanova, YA; Lopes, DV; Durana, E; Lisenkov, A; Frade, JR; Kovalevsky, AV
nossos autores
Aleksey Lisenkov
Investigador Júnior
Andrei Kavaleuski
Investigador principal
Daniela Vanessa Rosendo Lopes
Investigador Júnior
Jorge Ribeiro Frade
Professor(a) Jubilado(a)
Yuliya Ivanova
Bolseiro de pós-DoutoramentoProjectos
Collaboratory for Emerging Technologies, CoLab (EMERGING TECHNOLOGIES)
SusPhotoSolutions - Soluções Fotovoltaicas Sustentáveis (SUSPHOTOSOLUTIONS)
agradecimentos
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.