Development of New Brazing Alloys for Joining of Thermoelectric Materials

该项目的目标是建立适用于热电材料连接的新型填充金属合金成分的模型。大多数商业上可用的填充金属倾向于在350℃以下(焊料)或575C以上(钎焊填充金属)熔化，而银钎焊填充金属在650℃以上熔化。热电材料的连接被认为是一项技术挑战，因为：(1)焊料没有足够的强度，在较高的工作温度下可能会发生蠕变，以及(Ii)钎料的熔化温度可能会对热电材料本身造成损害。一种方法是寻找具有所谓高熵特性的钎焊合金，这种特性可能会表现出低于预期的熔化范围。

The aim of the project will be to model new filler metal alloy compositions that will be suitable for joining of thermo electric materials. The majority of commercially available filler metals tend to melt either below 350C (solders) or above 575C (brazing filler metals) with silver brazing filler metals melting above 650C. The joining of thermo electric materials is identified as a technology challenge because; (1) solders do not have sufficient strength and may suffer from Creep at the elevated operating temperatures and (ii) the melting temperature of brazing filler metals can result in damage to the thermo electric materials themselves. One approach will be to look for brazing alloys with so called high entropy characteristics which may exhibit lower than expected melting ranges.