Fabrication of ZrO2–Al2O3 hybrid nano-porous layers through micro arc oxidation process

Zirconia-alumina layers, with a pores size of 40–300nm, were fabricated via micro arc oxidation method for the first time. The layers were grown under alternative current in the electrolytes of ZrOCl2 salt. They consisted of α-Al2O3, γ-Al2O3, monoclinic ZrO2, tetragonal ZrO2. Increasing the voltage...

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Bibliographic Details
Published in:Materials letters 2011-06, Vol.65 (12), p.1835-1838
Main Authors: Shoaei-Rad, V., Bayati, M.R., Golestani-Fard, F., Zargar, H.R., Javadpour, J.
Format: Article
Language:English
Subjects:
Alumina
Composite materials
Electric potential
electric power
electrochemistry
electrolytes
Micro arc oxidation
Microcracks
Nanocomposites
Nanomaterials
Nanostructure
Oxidation
Porous materials
Voltage
Zirconia
zirconium
Zirconium dioxide
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Summary:Zirconia-alumina layers, with a pores size of 40–300nm, were fabricated via micro arc oxidation method for the first time. The layers were grown under alternative current in the electrolytes of ZrOCl2 salt. They consisted of α-Al2O3, γ-Al2O3, monoclinic ZrO2, tetragonal ZrO2. Increasing the voltage resulted in higher zirconium concentrations in the layers. A porous structure was obtained when the layers were grown under intermediate voltages. Microcracks were observed to appear when the applied voltage increased. Finally, a formation mechanism was proposed with emphasis on the chemical and the electrochemical foundations.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2011.03.086