S0305-3-5 ナノインデンテーション法によるSOFC電極/電解質界面の機械的特性評価(SOFC構成材料の信頼性(3))

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We investigated how the mechanical properties, i.e. the Young's modulus and the hardness, of the SOFC electrolyte were affected by cation diffusion from the electrode materials by using the nano-indentation method. In this work, the effect of Mn ion diffusion into (Y_2O_3)_<0.08>(ZrO_2)_<0.92>(YSZ) on its mechanical properties was discussed. From measurements with sintered compacts of Mn-doped YSZ, it was suggested that the Young's modulus of Mn-doped YSZ decreased with increasing the Mn content while the hardness was almost independent on the Mn content. In the diffusion couple of the single crystal YSZ and Mn_2O_3, decrease in the Young's modulus was observed in the vicinity of the interface depending on the Mn content. These results indicated that cation diffusion form the electrode material possibly leads to the local degradation of mechanical properties of the SOFC electrolyte.
2009-09-12