Abstract
In order to ensure reliability of the thermoelectric module, we had applied a FGM layer with composition of Cu and Si3N4 to the bonding parts in the module and decided the functionally graded compositional profile based on numerical analysis. In this study, Cu/Si3N4 functionally gradient material and Cu/Si3N4 composite materials were fabricated by hot press (HP) and static strength at room temperature was evaluated. As a result, it was found by observation with an optical microscope that neither FGM nor the composite materials produced by HP had internal defects. Static strength of composite materials obtained by the 4-point bending test exhibited a lower value as compared with those based on the rule of linear mixture. Finite element analysis for the FGM was performed. It was shown that fractured stress and initiation site of cracks could be predicted by using the fracture criterion for the bending strength of the composite materials.
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