Effect of Temperature and Environmental Aging on the Mechanical Reliability of N- and P-Type Thermoelectric Couples
Bismuth telluride-based alloys are the most widely used thermoelectric materials,which can obtain the conversion between heat energy and electricity.As a kind of lead-free solder alloy,Sn96.5Ag3.0Cu0.5 (SAC305) shows great potential in soldering between the thermoelectric element and electrode in thermoelectric couples.Cu/ SAC305 /Ni-plated Bi0.5Sb1.5Te3 (n-type) and Cu/ SAC305/ Ni-plated Bi1.8Sb0.2Se0.15Te2.85 (p-type) couples were connected at 250oC by reflow soldering to investigate effects of temperature and thermall aging on the efficiency and reliability of thermoelectric device.Effects of temperature and environmental aging on shear force of thermoelectric couples were studied respectively in the temperature range of 20oC to 180oC.At room temperature of 20oC,n-type thermoelectric couples showed higher shear force than p-type thermoelectric couples.N-type thermoelectric couple showed higher shear reliability than p-type thermoelectric couples after synchronized environmental aging.The shear force of both types of thermoelectric couples decreased with the growth of thermal aging cycles.Finally,the fracture surfaces of two types of thermoelectric couples were investigated respectively using SEM to further analyse the failure mechanism.
Temperature Thermal cycling effect Shear force Failure surface
Yansong Tan Xu Chen
School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China
国际会议
2016 International Symposium on Structural Integrity，ISSI—2016(2016国际结构完整性研讨会)
天津
英文
399-404
2016-05-26（万方平台首次上网日期，不代表论文的发表时间）