SiGe熱電素子とMo電極のろう付け接合

抄録

Si-Ge elements and Mo electrodes were tried to braze with 4 kinds of Ti-base brazes. Aπ-shaped module used for thermoelectric generator was constructed from one couple of p and n-type Si-Ge elements and Mo electrodes. The maximum electrical power P_max and the internal resistivity R_in of the modules were evaluated as a function of temperature difference between the hot side and cold side of the module. The module using TZCN braze (TZCN-module) showed the highest P_max and the lowest R_in After annealing treatment at 700°C in vacuum for 5hr, the R_in of the TZCN-module was increased to 1.5-2 times of the initial value before annealing. After the first 5hr annealing, the R_in was found to be stable for 53hr. Before and after annealing treatment at 700°C in vacuum for 3hr, the optical and the X-ray images of Si-Ge/Mo joint section brazed with TZCN were not observed to be changed. We thought that the increase of R_in during the first 5hr annealing is due to the fine cracks between Si-Ge and brazing layer.