J0802-4-1 ナノインデンテーション試験によるジルコニア系電解質材料の機械特性評価([J0802-4]SOFC,PV,キャパシタ)

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Young's modulus and hardness of polycrystalline sintered compacts of yttria-stabilized zirconia (YSZ), (Y_20_3)_<0.08>(Zr0_2)_<0.92> and gadolinium-doped ceria (GDC) (Gd_2O_3)_<0.05>(Ce0_2)_<0.90> were investigated by using the nano-indentation method. Together with results obtained by the secondary electron microscope observation and the electron backscattering diffraction analysis, the effect of the crystal orientation on the mechanical properties was discussed. It was empirically demonstrated that the Young's moduli of YSZ and GDC depend on the crystal orientation. The Young's moduli of YSZ and GDC showed the highest values on the (001) surface while the lowest values on the (111) surface. However, the observed anisotropy of the Young's modulus of YSZ was rather small compared with predicted one from the single crystal elastic constants in literature.
2010-09-04