S0305-3-2 共振法によるSOFC電解質材料の機械的特性評価(SOFC構成材料の信頼性(3))

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The Young's modulus, the shear modulus, the Poisson ratio and the internal friction of typical electrolyte materials for solid oxide fuel cells, (Gd_2O_3)_<0.05>(CeO_2)_<0.9>, (Sm_2O_3)_<0.05>(CeO_2)_<0.9>, (Y_2O_3)_<0.08>(ZrO_2)_<0.92>, (Y_2O_3)_<0.1>(ZrO_2)_<0.9>, (Sc_2O_3)_<0.1>(ZrO_2)_<0.9>, (Sc_2O_3)_<0.1>Ce_<0.01>(ZrO_2)_<0.89> were evaluated by a resonance method. The measurements were carried out from room temperature to 1273 K. The Young's modulus of (Gd_2O_3)_<0.05>(CeO_2)_<0.9> and (Sm_2O_3)_<0.05>(CeO_2)_<0.9> gradually decreased with increasing temperature as expected for the typical ceramics. However, the Young's modulus of the series of zirconia-based electrolyte drastically decreased in the temperature range between 573 K and 873 K, and correspondingly the internal friction increased. Such a characteristic temperature dependence of the mechanical properties was discussed in terms of phase change.
2009-09-12