Micromechanical Characterization of Ce0.8Gd0.2O2-δ–FeCo2O4 Dual Phase Oxygen Transport Membranes

Fanlin Zeng*, Jürgen Malzbender, Stefan Baumann, Falk Schulze-Küppers, Manja Krüger, Arian Nijmeijer, Olivier Guillon, Wilhelm Albert Meulenberg

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)
7 Downloads (Pure)

Abstract

Aiming toward an optimization of dual phase oxygen transport membrane materials for oxygen separation applications, ceramic composites consisting of a Ce1−xGdxO2−δ (0 < x < 0.2) fluorite phase, Gd0.9Ce0.1Fe0.8Co0.2O3 perovskite phase, FexCo3−xO4 (0 < x < 1) spinel phase, and CoO rock salt phase are developed and micromechanical properties (elastic modulus and hardness) of xCe0.8Gd0.2O2−δ: (1−x)FeCo2O4 (50 wt% ≤ x ≤ 90 wt%) composites are characterized via indentation testing at room temperature. The results obtained at low indentation loads indicate that the magnitude of the elastic moduli of the different phases is in the order Gd0.9Ce0.1Fe0.8Co0.2O3 > Ce1−xGdxO2−δ ≈ FexCo3−xO4 > CoO, and furthermore, hardness values are also in the same order. The hardness values of the obtained composites at higher impression loads reveal a stronger dependency on porosity than on composition due to similar hardness values of the main phases. Any compositional effect appears to diminish above a porosity of ≈1%.

Original languageEnglish
Article number1901558
JournalAdvanced engineering materials
Volume22
Issue number6
DOIs
Publication statusPublished - 1 Jun 2020

Keywords

  • UT-Hybrid-D
  • indentations
  • mechanical properties
  • microstructures
  • oxygen transport membranes
  • ceramic composites

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