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| Home > Publications database > Mechanical properties and lifetime predictions of SrTi1-xFexO3-d (x = 0.25, 0.35, 0.5) |
| Home > Publications database > Mechanical properties and lifetime predictions of SrTi1-xFexO3-d (x = 0.25, 0.35, 0.5) |
| Conference Presentation (After Call) | FZJ-2018-03719 |
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2018
Abstract: Oxygen transport membranes based on mixed ionic-electronic conducting ceramics can be an alternative to existing state-of-the-art processes for oxygen production in small and medium scale. Typically, such membranes have to be operated at 800 - 900 °C and under large pressure gradients, which challenges significantly the mechanical stability of the respective ceramic components. The current work concentrates on the mechanical characterization of promising oxygen transport perovskite membranes based on SrTi1-xFexO3-δ, (STFx) with x = 0.25, 0.35 and 0.5. The materials were synthesized through solid state reaction and most mechanical testing relevant specimens were obtained by tape casting. The mechanical stability was assessed via ring-on-ring bending tests serving the estimate of materials’ reliabilities and lifetime. Furthermore, aiming towards the determination of the mechanical stability at the operational relevant temperatures, flexural tests were conducted at 900 °C, where the derived fracture stress revealed to be higher. Hence, it appears that the material undergoes stress relaxation at high temperature associated to an anelastic behavior that might relate to a strong primary creep. Overall, the current study aids the adjustment of the membrane design regarding the process requirements, while data for mechanically derived lifetime predictions are acquired for STF based membranes.
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