Abstract
This paper uses finite element method to study the effect of Al 2O 3 film on thermal stresses in the bonded compliant seal (BCS) design of a planar solid oxide fuel cell. The effects of Al 2O 3 thickness, operating temperature, window frame thickness, foil thickness and cell length on thermal stresses have been discussed. The results show that compressive stresses are generated in Al 2O 3 film. A bowing deformation is generated due to the BCS design, which can trap and relax some thermal stresses. With Al 2O 3 thickness increase, compressive stresses in Al 2O 3 film and foil are decreased slightly, while tensile stresses in BNi 2 and frame are increased. With operating temperature increase, compressive stress in Al 2O 3 is increased greatly, while the stresses in foil, BNi2 and frame are increased slightly. The bowing deformation is increased with operating temperature increase. The window frame thickness has little effect on thermal stresses and bowing deformation. With sealing foil thickness increase, thermal stresses and bowing deformation are increased. The cell length has little effect on thermal stresses, but reducing the cell length can decrease the bowing deformation.
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