Influence of preparation method and alumina content on crystallization and morphology of porous yttria stabilized zirconia |
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| Affiliation: | 1. University of Zagreb, Faculty of Chemical Engineering and Technology, Marulićev trg 19, HR-10000 Zagreb, Croatia;2. Ruđer Bošković Institute, Bijenička cesta 54, HR-10000 Zagreb, Croatia;1. Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia;2. University of Applied Health Sciences, Mlinarska cesta 38, 10000, Zagreb, Croatia;3. Faculty of Chemical Engineering and Technology, Marulićev trg 19, Zagreb, Croatia;4. Sincrotrone Trieste, Strada Statale 14, km 163.5, 34149, Basovizza, TS, Italy;5. Jozef Stefan Institute, Ljubljana, Jamova 11, Slovenia;6. Central European Research Infrastructure Consortium, Strada Statale 14, km 163.5, 34149, Basovizza, TS, Italy;1. University of Zagreb, Faculty of Chemical Engineering and Technology, Marulićev trg 19, HR-10000 Zagreb, Croatia;2. University of Zagreb, Faculty of Geotehnical Engineering, Hallerova aleja 7, HR-42000 Varaždin, Croatia;3. Ruđer Bošković Institute, Bijenička cesta 54, HR-10000 Zagreb, Croatia;1. Ruđer Bošković Institute, 54 Bijenička cesta, HR-10 000 Zagreb, Croatia;2. Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, D-14195 Berlin, Germany;1. Nuclear Research Center of Birine, Box 180, Ain Oussera, Algeria;2. Laboratoire de Technologie des Matériaux, Département de Sciences des Matériaux, Faculté de Génie Mécanique et Génie des Procédés, USTHB, BP No 32, 16111 El-Alia, Bab-Ezzouar, Algiers, Algeria;3. Nuclear Research Center of Algiers, 2 Bd Frantz Fanon, Box 399, Alger-Gare, Algiers, Algeria |
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| Abstract: | Influence of addition of alumina and preparation methods (sol-gel synthesis and mechanochemical preparation) on crystallization and morphology of yttria stabilised zirconia was examined. Presence of alumina was found to delay crystallization of zirconia, the effect being more pronounced at higher alumina content. The two oxides form easily distinguished separate phases. Milling lowers the crystallization temperatures of the sol-gel derived powders since nuclei are formed during the milling and smaller particle size allows easier removal of residual organic components. The milling results in crystallization of some monoclinic zirconia, both in sol-gel derived powders and in case of mechanochemical processing. There are no significant differences between the preparation methods in pore size and relative density of sintered tablets: powders obtained by mechanochemical processing and milled sol-gel derived powders both give tablets with homogeneous morphology. The advantage of sol-gel process is preparation of pure tetragonal zirconia phase without traces of monoclinic phase. |
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| Keywords: | Sol-gel Mechanochemical processing Alumina Porosity |
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