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Micromechanical Characterization of Ce 0.8 Gd 0.2 O 2‐ δ –FeCo 2 O 4 Dual Phase Oxygen Transport Membranes
Author(s) -
Zeng Fanlin,
Malzbender Jürgen,
Baumann Stefan,
Schulze-Küppers Falk,
Krüger Manja,
Nijmeijer Arian,
Guillon Olivier,
Meulenberg Wilhelm Albert
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201901558
Subject(s) - materials science , elastic modulus , perovskite (structure) , analytical chemistry (journal) , phase (matter) , porosity , oxygen , spinel , indentation , ceramic , composite material , crystallography , metallurgy , chemistry , organic chemistry , chromatography
Aiming toward an optimization of dual phase oxygen transport membrane materials for oxygen separation applications, ceramic composites consisting of a Ce 1− x Gd x O 2− δ (0 < x < 0.2) fluorite phase, Gd 0.9 Ce 0.1 Fe 0.8 Co 0.2 O 3 perovskite phase, Fe x Co 3− x O 4 (0 < x < 1) spinel phase, and CoO rock salt phase are developed and micromechanical properties (elastic modulus and hardness) of x Ce 0.8 Gd 0.2 O 2− δ : (1− x )FeCo 2 O 4 (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 Gd 0.9 Ce 0.1 Fe 0.8 Co 0.2 O 3 > Ce 1− x Gd x O 2− δ ≈ Fe x Co 3− x O 4 > 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%.