抄録
The influences of the sintering additive content of Y2O3 on elastic modulus of ceria ceramics were investigated by small punch (SP) testing method and molecular dynamics (MD) method. Y2O3 doped ceria powders with a composition of (CeO2)1-x(YO1.5)x (x=0, 0.10, 0.15, 0.20, 0.30, 0.40) were prepared by a co-precipitation method. The powders were compacted by die pressing (50 MPa) followed by cold isostatic pressing (120 MPa), and sintered at 1500°C in air for 5 h. The elastic modulus was decreased significantly with increasing additive contents of the Y2O3 oxides. Especially, it tended to exhibit a minimum value at 10∼20 mol%. However, ionic conductivity increased with increasing additive content of the Y2O3 oxides, exhibited a maximum value at 15 mol%. Calculation model and interatomic potential were shown to be useful to evaluate the elastic property.
