Mechanical properties and lifetime predictions for Ba0.5Sr0.5Co0.8Fe0.2O3−δ membrane material

摘要: Abstract The mixed ion–electron conductor Ba0.5Sr0.5Co0.8Fe0.2O3−δ has a strong application potential as high-temperature gas separation membrane. However, for real components the mechanical integrity of this brittle perovskite ceramic will be challenged by boundary conditions transient and stationary temperature exposure. In particular, long-term failure mechanisms such static fatigue at room creep rupture operation may occur. relevance both effects is assessed. effect slow crack growth been investigated using fracture stresses obtained in biaxial bending under different loading rates. provided data permit to assess Furthermore, strength–probability–time plot derived that permits prediction lifetime hence reliability temperature. typical operating temperatures was analysed three-point tests permitting determination stress application-related combined tensile–compressive mode. are described modified Monkman–Grant relationship.