Preparation of aliened porous Ni-GDC nano composite by freeze-casting process
محل انتشار: مجله سرامیک های پیشرفته، دوره: 3، شماره: 1
سال انتشار: 1396
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 223
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شناسه ملی سند علمی:
JR_ACERPT-3-1_003
تاریخ نمایه سازی: 11 اردیبهشت 1400
چکیده مقاله:
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.
کلیدواژه ها:
نویسندگان
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