Mechanical reliability of Ce0.8Gd0.2O2−δ-FeCo2O4 dual phase membranes synthesized by one-step solid-state reaction

Fanlin Zeng*, Jürgen Malzbender, Stefan Baumann, Wenyu Zhou, Mirko Ziegner, Arian Nijmeijer, Olivier Guillon, Ruth Schwaiger, Wilhelm Albert Meulenberg

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
7 Downloads (Pure)

Abstract

Ce0.8Gd0.2O2−δ-FeCo2O4 composites are attractive candidate materials for high-purity oxygen generation providing robust chemical stability. Aiming for future industrial applications, a feasible solid-state reaction process with one thermal processing step was used to synthesize 50 wt% Ce0.8Gd0.2O2−δ:50 wt% FeCo2O4 and 85 wt% Ce0.8Gd0.2O2−δ:15 wt% FeCo2O4 composites. Mechanical reliabilities of the sintered membranes were assessed based on the characterized mechanical properties and subcritical crack growth behavior. In general, the fracture strengths of as-sintered membranes were reduced by tensile residual stresses and microcracks. In particular, the enhanced subcritical crack growth behavior, which leads to limited stress tolerance and high failure probability after a 10-year operation, was evaluated in more detail. Further materials and processing improvements are needed to eliminate the tensile stress and microcracks to warrant a long-term reliable operation of the composites.

Original languageEnglish
Pages (from-to)1814-1830
Number of pages17
JournalJournal of the American Ceramic Society
Volume104
Issue number4
DOIs
Publication statusPublished - 1 Apr 2021

Keywords

  • UT-Hybrid-D
  • lifetime prediction
  • mechanical properties
  • oxygen transport membrane
  • residual stress
  • dual phase ceramic composite

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