Tekin, Sinem

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https://hdl.handle.net/11147/16420
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01. Izmir Institute of Technology
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NO POVERTY1
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GOOD HEALTH AND WELL-BEING3
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QUALITY EDUCATION4
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CLEAN WATER AND SANITATION6
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AFFORDABLE AND CLEAN ENERGY7
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DECENT WORK AND ECONOMIC GROWTH8
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INDUSTRY, INNOVATION AND INFRASTRUCTURE9
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SUSTAINABLE CITIES AND COMMUNITIES11
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  • Master Thesis
    Sintering and Densification Behavior of Gdc Infiltrated Porous Gdc Electrolyte
    (01. Izmir Institute of Technology, 2021) Akkurt, Sedat; Tekin, Sinem; Ebil, Özgenç; Akkurt, Sedat; Ebil, Özgenç; 03.09. Department of Materials Science and Engineering; 03.02. Department of Chemical Engineering; 01. Izmir Institute of Technology; 03. Faculty of Engineering
    It is desired that the electrolytes used in solid oxide fuel cells have a dense structure. Ceria-based electrolytes require temperatures of 1400-1500oC to densify. High densification temperatures make this material less in demand despite its good ionic conductivity. In this study, it was aimed to sinter and densify porous GDC scaffolds made of GDC (Gd0.10Ce0.90O1.95) material at low temperatures using infiltration technique. A porous GDC scaffold is first produced by sintering the GDC pellet around 1000oC to obtain an intermediate product ready to be infiltrated by a GDC-bearing solution. Multiple infiltration and drying cycles were intended to fill the pores by GDC nanoparticles which are expected to densify at lower temperatures. Two different groups (infiltrated and non-infiltrated) were formed and their densification behaviors with temperature and infiltration repetition cycles were investigated using a vertical dilatometer. The porous GDC scaffold was infiltrated with a polymeric solution prepared from Ce(NO3)3.6H2O and Gd(NO3)3.6H2O. The prepared samples were sintered at 1400oC. As a result of the experiments, it was observed that the densification decreased with the increase in temperature and infiltration cycles. This is thought to be because the porous scaffold could not be completely dried during the infiltration cycles. This led to the formation of a dense outer layer of GDC and porous inner layer. This dense layer inhibited shrinkage of the pellet during dilatometric analysis. Further studies need to be conducted to fully evaporate the solvent during drying of the infiltrated pellets.