Rietveld refinement and estimation of residual stress in GDC–LSCF oxygen transport membrane ceramic composites

Raju, Kati; Seyoung, Kim; Yu, Ji Haeng; Kim, Soohyun; Han, In Sub

doi:10.1016/j.ceramint.2018.03.036

Cited by 24 publications

(10 citation statements)

References 47 publications

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“…CoO seems to appear only in 50CGO:50FCO, and the CoO in the bulk is around double that at the surface. Since the penetration depth of X-rays increases with the incident angle during measurement, and is on average greater than a few microns [73,74], the XRD investigation at the surface is expected to reveal crystal information also of the sub-surface material. Thus, the amount of CoO detected at the surface might, in fact, include some amount of sub-surface CoO.…”

Section: Phase Constituents and Microstructurementioning

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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Section: Phase Constituents and Microstructurementioning

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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“…2. Composite ceramic characteristics, structures, and mechanical behaviors [4,32,34,[51][52][53][54]. Module systems including the plate-, hollow [18], and honeycomb-type membrane modules (Figure 2) have been developed [19].…”

Section: Introduction Oxygen Transport Membranementioning

confidence: 99%

“…2. Composite ceramic characteristics, structures, and mechanical behaviors [4,32,34,[51][52][53][54]. In the late 1980s, the US, Japan, Europe, and other countries acknowledged the importance of high-oxygen separation techniques [20] and invested substantially in related studies.…”

Section: Introduction Oxygen Transport Membranementioning

confidence: 99%

“…5. Computer simulation, which is used to analyze the weak points in the membrane, predict the stresses in the OTM module system, and optimize or verify production [53,57,[59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76]. Although a few researchers have studied hollow and tubular modules, limited research has been devoted toward plate-type modules.…”

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Structure Optimization of a High-Temperature Oxygen-Membrane Module Using Finite Element Analysis

et al. 2021

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The oxygen transport membrane (OTM) is a high-density ion-conducting ceramic membrane that selectively transfers oxygen ions and electrons through the pressure differential across its layers. It can operate at more than 800 °C and serves as an economical method for gas separation. However, it is difficult to predict the material properties of the OTM through experiments or analyses because its structure contains pores and depends on the characteristics of the ceramic composite. In addition, the transmittance of porous ceramic materials fluctuates strongly owing to their irregular structure and arbitrary shape, making it difficult to design such materials using conventional methods. This study analyzes the structural weakness of an OTM using CAE software (ANSYS Inc., Pittsburgh, PA, USA). To enhance the structural strength, a structurally optimized design of the OTM was proposed by identifying the relevant geometric parameters.

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“…Zhang and al [17] taking into account oriented curved fibers and the rule of change of fiber angles and determining the residual stresses using abaqus, have proposed a mathematical model of stratified composites with variable rigidity for the residual stresses prediction induced during the polymerization process, they showed that the residual stresses induced in composites with variable stiffness are reduced by increasing the final angle of the fiber path during the hardening process. Kati and al [18], using X-ray diffraction (XRD), they analyzed the residual stresses induced in biphasic composite types Ce9GdO1-b-La 6 Sr 4 Co 2 Fe 8 O 3-6 (GDC-LSCF) obtained by sintering at 1250 °C and used for the manufacture of oxygen transport membranes, they showed that theses stresses put on compression the GDC and in tension the LSCF. The scanning electron microscopy has shown that these two compounds crystallize in cubic and rhombohedral spatial groups respectively.…”

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confidence: 99%

Finite element analysis of the thermomechanical behavior of metal matrix composites (MMC)

Baghdadi

Bouchra

Sérier

et al. 2019

Frattura Ed Integrità Strutturale

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In this work the finite element method (FEM) was used to analyze the mechanical behavior of the composite materials subjected to the mechanical loading. This behavior is studied in terms of stress intensity factor variation as a function of the applied stress intensity. The residual stresses induced in the composites, during the elaboration of these composites are taken into consideration in this study. The superimposition of these types of stresses (residuals and commissioning) is simulated here by thermomechanical stresses. The results obtained show that in the vicinity very close to the fibermatrix interface and under the effect of this loading type, the matrix cracks propagate in modes I, II and III, and far from the interface, in mode I. The propagation kinetics is slowed down by the interface-crack interaction. The effects of the crack size, the orientation and propagation of the crack, commissioning stresses, the elaboration temperature, fiber physical properties, matrix stiffness and thermomechanical stresses have been highlighted in this work.

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Rietveld refinement and estimation of residual stress in GDC–LSCF oxygen transport membrane ceramic composites

Cited by 24 publications

References 47 publications

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

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

Structure Optimization of a High-Temperature Oxygen-Membrane Module Using Finite Element Analysis

Finite element analysis of the thermomechanical behavior of metal matrix composites (MMC)

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Rietveld refinement and estimation of residual stress in GDC–LSCF oxygen transport membrane ceramic composites

Cited by 24 publications

References 47 publications

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

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

Structure Optimization of a High-Temperature Oxygen-Membrane Module Using Finite Element Analysis

Finite element analysis of the thermomechanical behavior of metal matrix composites (MMC)

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

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