Mechanical properties and lifetime predictions of dense SrTi1-xFexO3-δ (x = 0.25, 0.35, 0.5). Issue 7 (July 2017)

• Record Type: Journal Article
• Authors: Oliveira Silva, R.; Malzbender, J.; Schulze-Küppers, F.; Baumann, S.; Guillon, O.
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 7(2017)
• Page Start: 2629
• Page End: 2636
• Publication Date: 2017-07
• Subjects: Oxygen transport membrane -- Young's modulus -- Fracture strength -- Subcritical crack growth -- Lifetime; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2017.02.038
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: New oxygen transport membrane materials based on SrTi1-x Fex O3-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 1 N load for SrTi1-x Fex O3-δ (x = 0.25, 0.35, 0.5) specimens were 147 ± 10 GPa, 123 ± 6 GPa and 158 ± 10 GPa, respectively. Fracture stress was accessed by ring-on-ring testing performed at 100 N/min and the obtained results were 92 ± 9 MPa, 117 ± 15 MPa, and 100 ± 15 MPa for SrTi0.75 Fe0.25 O3, SrTi0.65 Fe0.35 O3, and SrTi0.5 Fe0.5 O3 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-x Fex O3-δ (x = 0.25, 0.35, 0.5) may resist for 1 year with a failure probability of 0.1% at least 15 MPa, 22 MPa, and 12 MPa respectively.