Strength degradation and failure limits of dense and porous ceramic membrane materials

G. Pećanac, Søren Preben Vagn Foghmoes, M. Lipińska-Chwałek, S. Baumann, T. Beck, J. Malzbender

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Thin dense membrane layers, mechanically supported by porous substrates, are considered as the most efficient designs for oxygen supply units used in Oxy-fuel processes and membrane reactors. Based on the favorable permeation properties and chemical stability, several materials were suggested as promising membrane and substrate materials: Ba0.5Sr0.5Co0.8Fe0.2O3−δ, La0.6−xSr0.4Co0.2Fe0.8O3−δ (x=0, 0.02) and Ce0.9Gd0.1O1.95−δ. Although membranes operate at elevated temperatures, the ends of tubes in certain three-end concepts remain almost at room temperature. The current work concentrates on the failure potential of these membrane parts, where in a complex device also the highest residual stresses should arise due to differences in thermal expansion. In particular, sensitivity of the materials to subcritical crack growth was assessed since the long-term reliability of the component does not only depend on its initial strength, but also on strength degradation effects. The results were subsequently used as a basis for a strength–probability–time lifetime prediction.
Original languageEnglish
JournalJournal of the European Ceramic Society
Volume33
Issue number13-14
Pages (from-to)2689-2698
ISSN0955-2219
DOIs
Publication statusPublished - 2013

Keywords

  • Ceramics
  • Membranes
  • Strength
  • Failure
  • Lifetime

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