Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10624810 | Ceramics International | 2015 | 6 Pages |
Abstract
Advanced oxygen transport membrane designs rely upon a thin functional layer supported by a porous substrate material that carries the mechanical loads. The creep deformation behavior needs to be assessed in order to warrant a long-term reliable operation at elevated temperatures. The current study reports the creep behavior of porous La0.6Sr0.4Co0.2Fe0.8O3âδ in air for a temperature range of 750-950 °C. Stress exponents and activation energies are derived from the deformation data. A comparison with the creep rates of dense material revealed a progressively increasing creep rate with increasing temperature that might be related to surface diffusional effects. Additional tests at room temperature revealed non-linear stress-strain curves and an apparent ferroelastic creep due to domain switching in the rhombohedral phase that is stable at lower temperature.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Ying Zou, Falk Schulze-Küppers, Jürgen Malzbender,