Abstract
3 mol% yttria-stabilized zirconia membranes prepared by a non-solvent induced phase separation technique can balance the performance between robust mechanics and high porosity, because of having a multi-scale porous microstructure. However, the fracture mechanism of membranes with multi-scale pores is incomplete due to the nonlinear structure, which limits its performance optimization. In this study, effects of the various pores on stress distributions and related mechanical properties were experimentally studied and simulated. The gradient diameter of the macro-channels led to a loading direction dependent flexural strength. Meanwhile, no strength degradation was found when penetration depths of these macro-channels increased from 70% to 80% of the membrane thickness, because the channel tails hardly caused interference to the maximum bending stress. The flexural strength was determined by the cellular structure surrounding the macro-channels, and its bimodal porosity distribution reduced the elastic modulus, which might favor an improvement of strain tolerance.
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