5005铝合金与4J34可伐合金的真空钎焊工艺Process of vacuum brazing 5005 aluminum alloy to 4J34 Kovar alloy

利用Al-Si-Mg钎料实现5005铝合金与4J34可伐合金的真空钎焊，研究了接头界面结构及其形成机理，分析了钎焊温度及保温时间对接头界面结构和抗剪强度的影响。结果表明：随着钎焊温度的升高和保温时间的延长，接头的抗剪强度先升高后降低；当钎焊温度为580 ℃、保温时间为15 min时，接头抗剪强度达到最大值81 MPa，此时，接头的典型界面结构为4J34可伐合金/FeAl/FeAl₃/Fe_mAl_n+α(Al)/5005铝合金。接头的断裂形式主要受钎焊温度的影响；当钎焊温度较低时，接头断裂于铝合金侧氧化膜层及铝合金内；当温度升高至580 ℃时，接头断裂于Fe_mAl_n+α(Al)反应层中。

Vacuum brazing of 5005 aluminum alloy and 4J34 Kovar was carried out with Al-Si-Mg filler foil as braze alloy. Various brazing heating cycles were carried out to study the effects of brazing parameters on the joint interface and mechanical properties. The results show that the shear strength of the joints increases firstly, and then decreases with increasing brazing temperature and holding time. According to the mechanical property tests, the joints brazed at 580 ℃ for 15 min obtain the maximum shear strength of 81 MPa, and the typical interface structure of the joints is 4J34 Kovar/FeAl/FeAl₃/Fe_mAl_n+α(Al)/5005 aluminum alloy from 4J34 Kovar to 5005 aluminum alloy side. The fracture form of the joints is mainly affected by brazing temperature. When the brazing temperature is low, the joints fracture on the oxide layer and aluminum alloy. When the temperature is high, the joints fracture on Fe_mAl_n+α(Al) layer.

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