Studies on mechanical behavior of LSFT-CGO dual-phase membranes at elevated temperatures in ambient air and slightly reducing environments

Nithyanantham, T.; Biswas, Somnath; Nagabhushana, Nagendra; Bandopadhyay, Sukumar

doi:10.1016/j.ceramint.2013.12.121

Cited by 8 publications

(8 citation statements)

References 49 publications

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“…Rather well-defined indentations and crack profiles can be seen. The fracture toughness of some dual-phase ceramics was reported to be influenced strongly by crack deflections [30,67]. In addition, it was reported that cracks were attracted to the phase with the lower elastic modulus and lower thermal expansion coefficient in dual-phase ceramics [30,31].…”

Section: Tablementioning

confidence: 99%

“…A higher mechanical strength has been reported for ceramics with smaller grain size [34,44,45]. According to the limited reported studies [24,30,31,46], the mechanical properties of dense dual-phase oxygen transport membranes show comparable dependence on microstructural characteristics such as porosity and grain size.…”

Section: Introductionmentioning

confidence: 98%

“…Although the research activities on dense dual-phase oxygen transport membranes showed a preference towards chemical properties, e.g., conductivity, oxygen permeability, and chemical stability [11][12][13][14][15][16][17][18][19][20][21][26][27][28], investigation and optimization of the mechanical properties are also indispensable for the realization of a long-term reliable operation [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of sintering conditions for improved microstructural and mechanical properties of dense Ce0.8Gd0.2O2--FeCo2O4 oxygen transport membranes

Zeng

Malzbender

Baumann

et al. 2021

Journal of the European Ceramic Society

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Section: Tablementioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Optimization of sintering conditions for improved microstructural and mechanical properties of dense Ce0.8Gd0.2O2--FeCo2O4 oxygen transport membranes

Zeng

Malzbender

Baumann

et al. 2021

Journal of the European Ceramic Society

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“…There are a number of reports on the mechanical properties of single phase oxygen transport membranes; however, studies on the mechanical properties of dual phase membranes are limited . Currently no study has been reported on the mechanical properties of CGO20–FC2O composites.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical Characterization of Ce_0.8Gd_0.2O_2‐δ–FeCo₂O₄ Dual Phase Oxygen Transport Membranes

et al. 2020

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Oxygen transport membranes, which exhibit an almost 100% permeation selectivity regarding oxygen, [1] are a promising option to realize environmental-friendly, economically sound, and efficient processes for pure oxygen production, [1-4] oxycombustion, [5-7] and conversion of carbonaceous products. [8-12] These applications typically involve harsh environments, in particular high temperatures, and oxygen partial pressure gradients as well as the exposure to flue gas, which can be detrimental to the chemical and mechanical stability of the respective membrane components. [13,14] Ceramic dual phase oxygen transport membranes are promising candidates for long-term stable operation under application-relevant conditions. [15-19] These dual phase membranes consist of two separated phases responsible for ionic and electronic conductivity, respectively. [1] Flexible tailoring regarding chemical properties and stability is permitted by a choice of plenty of possible materials for the individual phases with sufficient ionic or electronic conductivity. [20-23] In fact, it has been indicated that the use of Ce 0.8 Gd 0.2 O 1.9 as an ionic conducting phase enables the formation of mechanically and chemically stable composites. [15,18,24-26] Furthermore, it appears that the performance of Ce 0.8 Gd 0.2 O 1.9-based dual phase membranes can benefit from phase interactions between the two phases in the composites. [27,28] To limit thermal stresses that might induce microcracking and failure, the selection of an electronic conducting phase for Ce 0.8 Gd 0.2 O 1.9-based dual phase membranes should be based not only on performance regarding conductivity, but also on a matching coefficient of thermal expansion (TEC) with that of Ce 0.8 Gd 0.2 O 1.9. Therefore, FeCo 2 O 4 is an excellent candidate because of its high electronic conductivity of 18 S cm À1 at 800 C. Furthermore, it possesses a TEC that is close to that of Ce 0.8 Gd 0.2 O 1.9 (%12 Â 10 À6 K À1). [13] In fact, composites of xCe 0.8 Gd 0.2 O 2Àδ : (1Àx)FeCo 2 O 4 (60 wt% ≤ x ≤ 90 wt%) (CGO20-FC2O) have been reported to possess a remarkable chemical stability under flue gas conditions. [19] These composites are multiphase systems consisting of a Ce 1Àx Gd x O 2Àδ (0 < x < 0.2) (CGO) fluorite phase, an Fe x Co 3Àx O 4 (0 < x < 1) (FCO) spinel phase, a (Fe,Co)O rock salt phase, and a Gd 0.85 Ce 0.15 Fe 0.75 Co 0.25 O 3 (GCFCO) perovskite phase formed via phase reaction between Ce 0.8 Gd 0.2 O 2Àδ (CGO20) and FeCo 2 O 4 (FC2O). [19,28] In this case, the newly formed electronic conductive phases, i.e., (Fe,Co)O and GCFCO, contribute to an improved ambipolar conductivity. [19,28] There are a number of reports on the mechanical properties of single phase oxygen transport membranes; [29-33] however, studies on the mechanical properties of dual phase membranes are limited. [18,34,35] Currently no study has been reported on the mechanical properties of CGO20-FC2O composites. Therefore, in this work, we report on the investigation of the mechanical

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“…25 Aiming toward future scaling-up of dual phase membranes for industrial applications, mechanical behavior and robustness, in addition to chemical performance and stability, are of critical importance to warrant long-term safe operation. 7,20 Only a limited number of reports focused on the mechanical properties of dual phase membranes, [49][50][51][52][53] reporting values for, for example, elastic modulus, hardness, fracture strength, and fracture toughness. The subcritical crack growth behavior of dual phase membranes, though, has not yet been studied.…”

mentioning

confidence: 99%

Mechanical reliability of Ce_0.8Gd_0.2O₂₋_δ‐FeCo₂O₄ dual phase membranes synthesized by one‐step solid‐state reaction

et al. 2020

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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 Accepted Article This article is protected by copyright. All rights reserved failure probability after a 10-years 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.

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Studies on mechanical behavior of LSFT-CGO dual-phase membranes at elevated temperatures in ambient air and slightly reducing environments

Cited by 8 publications

References 49 publications

Optimization of sintering conditions for improved microstructural and mechanical properties of dense Ce0.8Gd0.2O2--FeCo2O4 oxygen transport membranes

Optimization of sintering conditions for improved microstructural and mechanical properties of dense Ce0.8Gd0.2O2--FeCo2O4 oxygen transport membranes

Micromechanical Characterization of Ce_0.8Gd_0.2O_2‐δ–FeCo₂O₄ Dual Phase Oxygen Transport Membranes

Mechanical reliability of Ce_0.8Gd_0.2O₂₋_δ‐FeCo₂O₄ dual phase membranes synthesized by one‐step solid‐state reaction

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Studies on mechanical behavior of LSFT-CGO dual-phase membranes at elevated temperatures in ambient air and slightly reducing environments

Cited by 8 publications

References 49 publications

Optimization of sintering conditions for improved microstructural and mechanical properties of dense Ce0.8Gd0.2O2--FeCo2O4 oxygen transport membranes

Optimization of sintering conditions for improved microstructural and mechanical properties of dense Ce0.8Gd0.2O2--FeCo2O4 oxygen transport membranes

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

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

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Micromechanical Characterization of Ce_0.8Gd_0.2O_2‐δ–FeCo₂O₄ Dual Phase Oxygen Transport Membranes

Mechanical reliability of Ce_0.8Gd_0.2O₂₋_δ‐FeCo₂O₄ dual phase membranes synthesized by one‐step solid‐state reaction