一种红外探测器用电子束焊接技术研究

Study on electron beam welding technology for infrared detector

针对当前制冷型红外探测器所使用的冷指零件材料(TC4)、冷台零件材料(可伐合金)开展真空电子束焊接技术研究。TC4合金和可伐合金在熔化焊接时,焊缝组织内会出现Fe—Ti金属间化合物,该类型的金属间化合物属于脆性材料。在焊接完成后温度降低的过程中,会因TC4和可伐合金的热膨胀系数差异导致焊缝开裂。本文通过在焊缝区域添加过渡金属,将Fe、Ti元素进行物理隔离,实现了TC4/可伐合金之间的熔化焊接。

Vacuum electron beam welding technology is studied for the titanium alloy(TC4)and kovar alloy used in infrared detectors.In the welding progress of TC4 alloy and kovar alloy,a kind of intermetallic compound containing Fe and Ti elements appears in the welding across.This kind of intermetallic compounds is a kind of fragile material.In the process of temperature reduction after welding,the difference of thermal expansion coefficient between TC4 and felling alloy would lead to weld cracking.By adding transition metal to the welding across,Fe and Ti elements are physically isolated to realize melting welding between TC4/felling alloy.