Microstructural design of cellular 3 YTZ-Al2O3 ceramic membranes
authors Ivanova, YA; Lopes, DV; Durana, E; Lisenkov, A; Frade, JR; Kovalevsky, AV
nationality International
journal CERAMICS INTERNATIONAL
author keywords Zirconia; Cellular ceramics; Taguchi planning; Suspension emulsification; Ceramic membrane
keywords ZIRCONIA; ALUMINA; MONOLITHS; PERFORMANCE; COMPOSITE; FUTURE; WATER
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.
publisher ELSEVIER SCI LTD
issn 0272-8842
isbn 1873-3956
year published 2021
volume 47
issue 1
beginning page 1040
ending page 1046
digital object identifier (doi) 10.1016/j.ceramint.2020.08.218
web of science category 7
subject category Materials Science, Ceramics
unique article identifier WOS:000589647600004

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