Abstract
New oxygen transport membrane materials based on SrTi1-xFexO3-δ, synthesized through solid state reaction and processed via tape casting were characterized with respect to their mechanical behaviour via depth-sensitive indentation and ring-on-ring flexural testing. The elastic moduli obtained by indentation with 1N load for SrTi1-xFexO3-δ (x=0.25, 0.35, 0.5) specimens were 147±10GPa, 123±6GPa and 158±10GPa, respectively. Fracture stress was accessed by ring-on-ring testing performed at 100N/min and the obtained results were 92±9MPa, 117±15MPa, and 100±15MPa for SrTi0.75Fe0.25O3, SrTi0.65Fe0.35O3, and SrTi0.5Fe0.5O3 respectively. Ring-on-ring tests conducted at different loading rates gave access to subcritical crack growth sensitivity and aided the prediction of the materials’ lifetime through stress-time-probability diagrams, where SrTi1-xFexO3-δ (x=0.25, 0.35, 0.5) may resist for 1year with a failure probability of 0.1% at least 15MPa, 22MPa, and 12MPa respectively.
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