Journal
ADVANCED ENGINEERING MATERIALS
Volume 22, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.201901558
Keywords
ceramic composites; indentations; mechanical properties; microstructures; oxygen transport membranes
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Funding
- China Scholarship Council
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Aiming toward an optimization of dual phase oxygen transport membrane materials for oxygen separation applications, ceramic composites consisting of a Ce1-xGdxO2-delta (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 xCe(0.8)Gd(0.2)O(2-delta): (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-delta approximate to 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 approximate to 1%.
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