Advanced oxygen transport membrane designs consist of a thin functional layer supported by a porous substrate material that carries mechanical loads. Creep deformation behavior is to be assessed to warrant a long-term reliable operation at elevated temperatures. Aiming towards an asymmetric composite, the current study reports and compares the creep behavior of La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ (LSCF) perovskite porous substrate material with different porosity and pore structures in air for a temperature range of 800–1000 °C. A porosity and pore structure independent average stress exponent and activation energy are derived from the deformation data, both being representative for the LSCF material. To investigate the structural stability of the dense layer in an asymmetric membrane, sandwich samples of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF) and La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ (LSCF) with porous substrate and dense layers on both side were tested by three-point bending with respect to creep rupture behavior of the dense layer. Creep rupture cracks were observed in the tensile surface of BSCF, but not in the case of LSCF.

先进的氧气传输膜设计包括一层薄薄的功能层，该薄层由承载机械载荷的多孔基材支撑。应评估蠕变变形行为，以确保在高温下能长期可靠地运行。针对不对称复合材料，本研究报告并比较了La _0.6 Sr _0.4 Co _0.2 Fe _0.8 O3 _-δ的蠕变行为（LSCF）钙钛矿多孔基质材料，在800-1000°C的温度范围内，在空气中具有不同的孔隙率和孔结构。孔隙率和孔隙结构无关的平均应力指数和活化能均来自变形数据，均代表了LSCF材料。为了研究不对称膜中致密层的结构稳定性，将Ba _0.5 Sr _0.5 Co _0.8 Fe _0.2 O3 _-δ（BSCF）和La _0.6 Sr _0.4 Co _0.2 Fe _0.8 O3 _-δ的夹心样品相对于致密层的蠕变断裂行为，通过三点弯曲测试了具有多孔基底和致密层的两面（LSCF）。在BSCF的拉伸表面观察到蠕变破裂裂纹，而在LSCF的情况下则没有。