Evaluation of the residual stress for anode-supported SOFCs

Yakabe, H.; Baba, Yoshitaka; Sakurai, Teruhiro; Yoda, Yoshitaka

doi:10.1016/j.jpowsour.2003.11.049

Cited by 108 publications

(92 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is also known that the residual stress values of SOFC electrodes (or any other materials) are very much dependent upon the measurement method (e.g. X-ray diffraction [2,[4][5][6][7][8][9][10][11][12][13][14][15][16][17], synchrotron X-ray radiation [18][19][20][21], curvature method [15,[22][23][24][25][26], finite element [27,28], numerical [16,29], focused ion beam milling and digital image correlation [30], white light interferometry [25], nanoindentation [25,28], and neutron diffraction [31] methods). Furthermore, thermal spray deposition processes due to high cooling rates of the impacting particles (lamella) impart residual stress in the layered SOFC materials and hence influence the durability and efficiency of the cell.…”

Section: Introductionmentioning

confidence: 99%

Neutron Diffraction Residual Strain Measurements of Molybdenum Carbide-Based Solid Oxide Fuel Cell Anode Layers with Metal Oxides on Hastelloy X

et al. 2017

View full text Add to dashboard Cite

Thermal spray deposition processes impart residual stress in layered Solid Oxide Fuel Cells (SOFC) materials and hence influence the durability and efficiency of the cell. The current study which is the first of its kind in published literature, reports results on using a neutron diffraction technique, to non-destructively evaluate the through thickness strain measurement in plasma sprayed (as-sprayed) anode layer coatings on a Hastelloy®X substrate. Through thickness neutron diffraction residual strain measurements were done on three different anode coatings (Mo-Mo 2 C/Al 2 O 3 , Mo-Mo 2 C/ ZrO 2 and Mo-Mo 2 C/TiO 2 ) using the vertical scan mode. The three anode coatings (developed through optimised process parameters) investigated had porosities as high as 20%, with thicknesses between 200 μm to 300 μm deposited on 4.76 mm thick Hastelloy®X substrate discs of 20 mm diameter. The results showed that while the through thickness residual strain in all three anodes was dissimilar for the investigated crystallographic planes, on average it was tensile. Other measurements include X-ray diffraction, nanoindentation and SEM microscopy. As the anode layer microstructures are complex (includes bi-layer alternate phases), nondestructive characterisation of residual strain, e.g. using neutron diffraction, provides a useful measure of through thickness strain profile without altering the stress field in the SOFC electrode assembly.

show abstract

Section: Introductionmentioning

confidence: 99%

Neutron Diffraction Residual Strain Measurements of Molybdenum Carbide-Based Solid Oxide Fuel Cell Anode Layers with Metal Oxides on Hastelloy X

et al. 2017

View full text Add to dashboard Cite

show abstract

“…However, the huge compressive internal stress of approximately 650 MPa was observed in the electrolyte for ASCs by Xray stress measurement at room temperature, 13) which is caused by the mismatch of coefficients of thermal expansion between dense YSZ thin-film (10 © 10 ¹6 K ¹1 ) 14) and porous Ni-YSZ substrate (12 © 10 ¹6 K…”

Section: )12)mentioning

confidence: 99%

Metal-supported microtubular solid oxide fuel cells with ceria-based electrolytes

Sumi

Shimada

Yamaguchi

et al. 2017

J. Ceram. Soc. Japan

View full text Add to dashboard Cite

Metal-supported solid oxide fuel cells (SOFCs) are expected to lower operating temperature and improve reliability. The residual crushing strength and electrical conductivity of porous metallic nickel microtubes were higher than those of nickel-gadoliniadoped ceria (Ni-GDC) cermets. The maximum power density of the metal-supported microtubular SOFC with GDC electrolyte was approximately three times higher than that of a conventional anode-supported microtubular SOFC with yttria-stabilized zirconia electrolyte at a relatively low temperature of 550°C. The metal-supported microtubular SOFCs have a potential to be applied not only in stationary devices, such as residential combined heat/power systems, but also in portable power sources and vehicles.

show abstract

“…The key feature of the model consists in numerical coupling of the three-dimensional Computational Fluid Dynamics technique, used for an accurate evaluation of the flow and temperature distributions inside the mSOFC stack, with Computational Structural Mechanics Finite Element Method (FEM) analysis that allows to predict thermal stresses. A similar approach was applied by Wei et al [17], Yakabe et al [8,12], Nakajo et al [13], Liu et al [18] and Peksen [19,20].…”

Section: Introductionmentioning

confidence: 96%

“…The results revealed that the foil seal was able to accommodate a significant degree of thermal mismatch strain between the metallic support structure and the ceramic cell via elastic deformation of the foil and plasticity in the foil to cell braze layer. Yakabe et al [12] examined experimentally and numerically the residual thermal stresses in the electrolyte of anode supported planar Solid Oxide Fuel Cells. The effect of the sample cut on the residual stress was studied.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of thermal stresses in a new design of microtubular stack

2015

View full text Add to dashboard Cite

Microtubular Solid Oxide Fuel Cells (mSOFCs) are one of the most promising and efficient devices that convert chemical energy of fuels into electrical energy. However, mSOFC stacks work at high operating temperature over 650°C, which leads to thermally induced mechanical stresses and in consequence may cause failure of stack components. In order to reduce the local thermal gradients and prevent high stresses in the stack components, it is desirable to study the effect of stack design on its performance. For this purpose a 3D numerical approach was developed to estimate thermal expansion of fuel cell inside an mSOFC stack and to reduce the associated experimental efforts and costs. Initially, a Computational Fluid Dynamics (CFD) model was used to calculate the temperature and species concentration profiles. During the second modeling step temperature profiles were used in the thermo-mechanical model to calculate the thermal stress distribution in the mSOFC stack. The results maximum thermal axial elongation that equals 1.4 mm for the mSOFC stack. The modelled maximum radial elongation was equal to 0.5 mm in the contact areas of the cylindrical housing and manifolds on the fuel inlet side.

show abstract

Evaluation of the residual stress for anode-supported SOFCs

Cited by 108 publications

References 6 publications

Neutron Diffraction Residual Strain Measurements of Molybdenum Carbide-Based Solid Oxide Fuel Cell Anode Layers with Metal Oxides on Hastelloy X

Neutron Diffraction Residual Strain Measurements of Molybdenum Carbide-Based Solid Oxide Fuel Cell Anode Layers with Metal Oxides on Hastelloy X

Metal-supported microtubular solid oxide fuel cells with ceria-based electrolytes

Numerical analysis of thermal stresses in a new design of microtubular stack

Contact Info

Product

Resources

About