Evaluation of elastic properties of reduced NiO-8YSZ anode-supported bi-layer SOFC structures at elevated temperatures in ambient air and reducing environments

Biswas, Saheli; Nithyanantham, T.; Saraswathi, N.T.; Bandopadhyay, Sukumar

doi:10.1007/s10853-008-3141-9

Cited by 28 publications

(13 citation statements)

References 33 publications

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“…The temperature dependence of the elastic modulus of Ni(O)-YSZ anode materials is well described in literature, showing fairly similar trends [17,23,24]. The elastic modulus in oxidized state (NiO-YSZ) exhibits a peak at temperature around 250330 C related to the antiferromagnetic to paramagnetic transition of NiO, followed by a slight decrease (less than 3% upto 800 C), though a shift in temperature appears when comparing the data between [23] and [24].…”

Section: Influence Of Temperature On Strength Of Reduced/unreduced Ansupporting

confidence: 69%

“…The elastic modulus in oxidized state (NiO-YSZ) exhibits a peak at temperature around 250330 C related to the antiferromagnetic to paramagnetic transition of NiO, followed by a slight decrease (less than 3% upto 800 C), though a shift in temperature appears when comparing the data between [23] and [24]. In the reduced state the elastic modulus decreased linearly with temperature.…”

Section: Influence Of Temperature On Strength Of Reduced/unreduced Anmentioning

confidence: 99%

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Influence of temperature and atmosphere on the strength and elastic modulus of solid oxide fuel cell anode supports

Charlas

Kwok

et al. 2016

Journal of Power Sources

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Section: Influence Of Temperature On Strength Of Reduced/unreduced Ansupporting

confidence: 69%

Section: Influence Of Temperature On Strength Of Reduced/unreduced Anmentioning

confidence: 99%

Influence of temperature and atmosphere on the strength and elastic modulus of solid oxide fuel cell anode supports

Charlas

Kwok

et al. 2016

Journal of Power Sources

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“…Therefore, simulations were carried out with only the lowest temperature-dependent CTE, together with a smaller Young's modulus of 10 GPa reported for LSM [16]. Alternative temperature dependent mechanical properties used for the simulation of the sintering process are the CTE of 8YSZ from Pratihar et al [38] and Young's modulus in oxidised and reduced state from Biswas et al [39]. The Weibull and creep parameters of the different layers are not varied.…”

Section: Original Research Papermentioning

confidence: 99%

“…• a slower cooling rate of 100 K h -1 , along with the CTE of 8YSZ from Pratihar et al [38] and the Young's modulus of the anode support from Biswas et al [39] to reproduce the XRD data from Fischer et al [18], • the CTE of 8YSZ from Johnson and Qu [43] for the XRD measurements of [19] and [22].…”

Section: Comparison Against Xrd Measurementsmentioning

confidence: 99%

Sensitivity of Stresses and Failure Mechanisms in SOFCs to the Mechanical Properties and Geometry of the Constitutive Layers

2011

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A model based on the Euler–Bernoulli theory is used to assess the sensitivity of residual stresses in solid oxide fuel cells to the mechanical properties and geometry of the constituents. It considers different cell configurations, characterised by the presence or not of a compensating layer, and a cathode based on either lanthanum strontium manganite (LSM) or lanthanum strontium cobaltite ferrite (LSCF). The implementation of creep in the model provides insights into the parameters that affect the zero‐stress temperature and behaviour during ageing. The amount of irreversible deformation generated in the cell layers after the sintering step depends on the mechanical properties of the layers, type of cell and to some extent, cooling rate. X‐ray diffraction measurements from literature are used to verify the prediction. Depending on the mechanical properties, the stress state in the LSM cathode changes from tensile to compressive with respect to temperature. During combined ageing and thermal cycling, tensile stress might arise in the compatibility layer of LSCF‐based cells, due to the relief of the initial compressive stress at operating temperature. The Weibull analysis provides the assessment of mechanical failure. A simplified approach is used for buckling‐driven delamination, but the propagation of cracks is predicted for unlikely large pre‐existing defects.

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“…Strength of the anode can be influenced by the reduction treatment: low reduction temperature weakens the anode support [4,5]. Furthermore, the elastic properties of the anode are described versus temperature in oxidized and reduced state [6,7].…”

Section: Introductionmentioning

confidence: 99%

Strength of Anode‐Supported Solid Oxide Fuel Cells

Faes

Frandsen²,

Kaiser³

et al. 2011

Fuel Cells

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Nickel oxide and yttria doped zirconia composite strength is crucial for anode‐supported solid oxide fuel cells, especially during transient operation, but also for the initial stacking process, where cell curvature after sintering can cause problems. This work first compares tensile and ball‐on‐ring strength measurements of as‐sintered anodes support. Secondly, the strength of anode support sintered alone is compared to the strength of a co‐sintered anode support with anode and electrolyte layers. Finally, the orientation of the specimens to the bending axis of a co‐sintered half‐cell is investigated. Even though the electrolyte is to the tensile side, it is found that the anode support fails due to the thermo‐mechanical residual stresses.

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Evaluation of elastic properties of reduced NiO-8YSZ anode-supported bi-layer SOFC structures at elevated temperatures in ambient air and reducing environments

Cited by 28 publications

References 33 publications

Influence of temperature and atmosphere on the strength and elastic modulus of solid oxide fuel cell anode supports

Influence of temperature and atmosphere on the strength and elastic modulus of solid oxide fuel cell anode supports

Sensitivity of Stresses and Failure Mechanisms in SOFCs to the Mechanical Properties and Geometry of the Constitutive Layers

Strength of Anode‐Supported Solid Oxide Fuel Cells

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