J081023 SOFC燃料極材料であるNi/NiO-YSZの作動環境下における機械特性([J08102]燃料電池(2))

概要

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We measure the stress?strain curves of the Ni-YSZ cermets, which reduced from NiO-8YSZ composites (60:40wt%) with 30% porosity and under 5% porosity, using the in-situ four points bending instrument in SOFC operating conditions. In reduction atmospheres, the s-s curves clearly change from elastic behavior to ductile behavior at the temperatures over than 380°C both specimens, and do not show clear yield points. Profile measurement reveals that Ni-8YSZ cermets plastically deform with elastic deformation, and it is deformed at very low applied stress. The results suggest that local plastic deformation will easily occur when anode supported type cells are reduced at first time. The bending strength of NiO/8YSZ hardly changes from room temperature to 800°C. While the Ni-8YSZ anodes show a complex profile of bending strength as a function of temperature, which is significantly different from the un-reduced NiO/8YSZ samples. SOFC is required to be designed with in mind that mechanical property of anode depends on temperature.
一般社団法人日本機械学会の論文
2011-09-11