Abstract
The Cu/Zn-14.1Al-0.9Si/Al joints were joined by flame brazing and furnace brazing, respectively. The influence of brazing methods on the interface structure and property of Cu/Al brazed joint was investigated. It was found that the interface structure near Cu substrate of the joint with different brazing method are both Cu/diffusion layer/Al4.2Cu3.2Zn0.7 layer, but the thickness of the interface layer of the joint with the flame brazing (3-4μm) is obviously thinner than that of the joint with the furnace brazing (5-10μm). The filler metal zone of the joint with flame can not find the Cu-Al IMCs. Instead, the block CuAl2 IMC can generate in the filler metal zone of the joint with the furnace brazing. For thinner interface layer, the joint with flame brazing has higher shear strength of average 60.5MPa, which is 20.6MPa higher than that of the joint with air cooling (39.9MPa).
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