This study has investigated mechanical properties of perovskite-structured Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF) oxygen transport membrane. The Young’s modulus and fracture toughness are determined by both macroscopic-scale and microscopic-scale methods. Both three-point and ring-on-ring bending tests as macroscopic-scale methods produce broadly similar results with a Young’s modulus, which is lower than that measured from micro-indentation method under a 10 N load. Young’s modulus and fracture toughness of BSCF show strongly dependent of the porosity. However, the fracture toughness of BSCF is independent of grain size. The fracture toughness determined by macroscopic-scale method is similar with that measured by microscopic-scale method. The crack shape of BSCF under a 10 N load is determined to be a median-radial mode. The intrinsic Young’s modulus and fracture toughness are determined to be 105.6 GPa and 1.49 MPa m^0.5, respectively, according the Minimum Solid Area (MSA) model. Annealing decreases the fracture toughness of BSCF between RT and 800 °C.

本研究研究了钙钛矿结构的Ba _0.5 Sr _0.5 Co _0.8 Fe _0.2 O3 _-δ的力学性能（BSCF）氧气传输膜。杨氏模量和断裂韧性通过宏观和微观方法确定。作为宏观方法的三点弯曲试验和环上弯曲试验均产生与杨氏模量大致相似的结果，该杨氏模量低于在10 N载荷下通过微压痕法测得的杨氏模量。BSCF的杨氏模量和断裂韧性与孔隙率密切相关。但是，BSCF的断裂韧性与晶粒尺寸无关。用宏观方法测定的断裂韧性与用微观方法测定的断裂韧性相似。BSCF在10 N载荷下的裂纹形状确定为中值径向模式。确定的固有杨氏模量和断裂韧性为105.6 GPa和1.49 MPa m ^0.5分别根据最小实体面积（MSA）模型。退火降低了BSCF在室温和800°C之间的断裂韧性。