残留熱応力解析による熱電変換モジュール用FGMコンプライアント・パッドの傾斜組成設計

概要

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Thermoelectric power generation is an electric system used to directly translate a temperature difference to a potential difference based on the Seebeck effect. Although thermoelectric generation as a small power source in spacecraft has been developed mainly in the U.S., the generation system did not spread industrial power generation because of high manufacturing cost. We proposed a structural concept of a FGM (functionally gradient material) compliant pad to reduce the concentration of thermal stress between the thermoelectric cell and the wall of the heat exchanger for a SiGe thermoelectric conversion system as industrial power generation. This paper describes a graded compositional design of the compliant pad for reducing the residual stress caused by a sintering process. The graded compositional profile in Pd/Si_3N_4 and Si_3N_4/Cu graded interface was examined by a local approach method which was proposed in this study. As results, a concentration of residual thermal stress in the thermoelectric cell was reduced by an application of the compliant pad with Si_3N_4-rich FGM. Also, the application of FGM to compliant pad had no effect on temperature distribution in the module.
一般社団法人日本機械学会の論文
1996-02-25