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Preparation of aliened porous Ni-GDC nano composite by freeze-casting process

Year: 1396
COI: JR_ACERPT-3-1_003
Language: EnglishView: 83
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Zahra Khakpour - ceramic, Material and Energy Research Center
Amin Mousavi - ceramic, Material and Energy Research Center
Morteza Niazmand - ceramic, Material and Energy Research Center
Masoud Alizadeh - ceramic, Material and Energy Research Center
Ali Zamanian - Nano-Technology and Advanced Materials, Material and Energy Research Center


This current study reports preparation of Nickel-Gadolinium doped Ceria (Ni-GDC) composite via controlled unidirectional freeze casting of aqueous-based GDC slurry completed with nickel infiltrated into the porous GDC samples. Gadolinium doped ceria powder prepared by gel-combustion synthesis method. The oxide powder was confirmed to be the fluorite-structured of Ce۰.۸Gd۰.۲O۱.۹ solid solution by X-ray diffraction. The synthesized powder with dolapix as a dispersant, ammoniac as an agent pH, poly vinyl alcohol (PVA) as a binder and water as a solvent were used to prepare stable GDC slurries.  Freeze casting process was done in different solid loading of GDC at ۳۵, ۴۵ and ۴۴ wt. %, and two different rates of ۱ and ۳ ̊C/min to obtain desirable pore structure. After removing the frozen ice at -۵۸ ̊C the green samples were sintered for ۲ h in air at ۱۳۰۰ °C. The pore structure and final microstructure were studied by scanning electron microscopy. The porosity of the sintered samples was in a range of ۶۰-۷۰% , and were depended on solid content and freeze casting rate.  Finally nickel solution was infiltrated into hierarchically porous GDC samples, after reduction at ۸۰۰ ̊C, Ni-GDC composite was attained.


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Khakpour, Zahra and Mousavi, Amin and Niazmand, Morteza and Alizadeh, Masoud and Zamanian, Ali,1396,Preparation of aliened porous Ni-GDC nano composite by freeze-casting process,

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