Abstract
The elevated operational temperature of a solid oxide fuel cell (SOFC) means that the cell components are subject to a number of issues affecting their mechanical integrity within the composite structure. These include residual stresses due to thermal expansion mismatch of the components, thermally induced stresses, and material creep at the elevated temperature. Half cells made of a standard yttria stabilized zirconia (YSZ) electrolyte substrate coated with an anode or cathode were specially prepared for the residual stress and creep analysis, and a porous support material was tested to fracture under thermally induced stresses. The creep deflection of the coated material was observed to be greater than that of the corresponding plain YSZ under the same temperature and stress conditions. Results of residual stress measurements based on curvature measurement were also found to be significantly lower than the predicted Finite Element stresses. The porous support exhibited good resistance to thermal stresses.
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