플라즈마 소결법을 이용한 고체산화물 연료전지 음극제조 시 소결온도에 따른 미세구조 및 물성평가
Effect of Sintering Temperature on the Microstructure and Mechanical Properties of Solid Oxide Fuel Cell Anode Fabricated by Spark Plasma Sintering
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초록
Microstructural and mechanical properties of Ni-YSZ fabricated using SPS processing have been investigated at various sintering temperatures. Our study shows samples to be applied as a SOFC anode have the proper porosity of 40% and high hardness when processed at 1100ºC. These results are comparable to the values obtained at 100-200ºC higher sintering temperature reported by others. This result is important because when the fabrication processes are performed above 1100ºC, the mechanical property starts to decrease drastically. This is caused by the fast grain coarsening at the higher temperature, which initiates a mismatch between thermal expansion coefficients of Ni and YSZ and induces cracks as well.
Abstract
Microstructural and mechanical properties of Ni-YSZ fabricated using SPS processing have been investigated at various sintering temperatures. Our study shows samples to be applied as a SOFC anode have the proper porosity of 40% and high hardness when processed at 1100ºC. These results are comparable to the values obtained at 100-200ºC higher sintering temperature reported by others. This result is important because when the fabrication processes are performed above 1100ºC, the mechanical property starts to decrease drastically. This is caused by the fast grain coarsening at the higher temperature, which initiates a mismatch between thermal expansion coefficients of Ni and YSZ and induces cracks as well.
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