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Mechanical reliability of Ce 0.8 Gd 0.2 O 2− δ ‐FeCo 2 O 4 dual phase membranes synthesized by one‐step solid‐state reaction
Author(s) -
Zeng Fanlin,
Malzbender Jürgen,
Baumann Stefan,
Zhou Wenyu,
Ziegner Mirko,
Nijmeijer Arian,
Guillon Olivier,
Schwaiger Ruth,
Albert Meulenberg Wilhelm
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17583
Subject(s) - materials science , ultimate tensile strength , residual stress , membrane , composite material , stress (linguistics) , phase (matter) , reliability (semiconductor) , thermal stability , chemical engineering , chemistry , thermodynamics , linguistics , biochemistry , philosophy , power (physics) , organic chemistry , physics , engineering
Ce 0.8 Gd 0.2 O 2− δ ‐FeCo 2 O 4 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% Ce 0.8 Gd 0.2 O 2− δ :50 wt% FeCo 2 O 4 and 85 wt% Ce 0.8 Gd 0.2 O 2− δ :15 wt% FeCo 2 O 4 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.