高温真空钎焊炉钼屏开裂原因分析

Fracture analysis of molybdenum lamella for high temperature vacuum brazing furnace

在高温真空钎焊炉中对汽车用三元催化净化器金属蜂窝载体进行真空钎焊,设备使用较短时间内,炉胆钼屏出现变形、开裂失效现象。对开裂的高温真空钎焊炉钼屏进行了使用前后的形貌对比及化学成分分析。结果表明,钼屏加速变形、开裂的原因是镍基钎料在钼屏表面的沉积,沉积物改变了钼屏表面的组织成分并带来钼屏物理性能的改变。据此提出高温真空钎焊炉炉胆钼屏的设计要点。

When a metal honeycomb carrier of the automotive three -way catalytic converter is vacuum brazed in high temperature brazing furnace, the furnace′s molybdenum lamella appear the phenomenon of failure such as deformation and fracture. The author compares the morphology and chemical composition of the fractured molybdenum lamella in high temperature brazing furnace with the untapped molybdenum lamella, the results show that the reason of deformation and fracture is the nickel-based solder deposition on the molybdenum lamella surface. The sediments change the tissue components and physical properties of the molybdenum lamella. According to the results, the design elements of molybdenum lamella in high temperature brazing furnace is proposed.