含硼Cu-P基非晶钎料钎焊紫铜接头的连接强度及微观组织

The strength and microstructure of Cu joints brazed with Cu-P based amorphous brazing filler metal contained B

采用CuP7.7Sn5.4Ni14Si0.2B0.03非晶和常规钎料钎焊紫铜接头,研究了钎焊工艺对连接强度的影响,分析了钎焊接头的微观组织.研究结果表明:钎焊工艺对CuP7.7Sn5.4Ni14Si0.2B0.03常规与非晶钎料钎焊接头的强度均有明显影响,同样条件下,钎焊温度的影响更大;非晶钎料钎焊接头的剪切强度始终高于常规钎料;CuP7.7Sn5.4Ni14Si0.2B0.03非晶钎料钎焊接头扩散区和界面区主要是α-Cu固溶体组织,钎缝中心区主要为α-Cu+(Cu,Ni)3P+(α-Cu+Cu3P)共晶+(α-Cu+Cu3P+δ)共晶的混合组织;CuP7.7Sn5.4Ni14Si0.2B0.03钎焊接头断裂界面处存在大量的Cu-P,Ni-P,Cu-Sn等脆性相,因此,减少脆性化合物的数量有助于提高钎焊接头强度.

The copper joints were brazed with CUP7.7Sn5.4Nil4Si0.2B0.03amorphous filler metal and conventional filler metal, the microstructure of filler metal and brazing joint were analyzed and the effect of brazing pro- cedure on joints strength was studied. The results show that the brazing procedure has great effects on the brazing joints of both of the CUP7.7Sn5.4Nil.4Si0.2B0.03 normal and amorphous filler metal. In the same experimental condition, the temperature has more ,effects on the shear strength. And tile shear strength of amorphous metal joints are always higher than the normal. The microstrueture of diffusion and interface zone in joint brazed with CUP7.7Sn5.4Nil4Si0.2B0.03 amorphous brazing filler metal are mainly composed of α- Cu solid solution, and the center in the brazing seam is mainly composed of α -Cu and （Cu, Ni）3P and （α -Cu ＋ Cu3P） eutectic and （α - Cu ＋ Cu3P ＋δ） ternary eutectic. A large number of Cu - P, Ni - P, Cu - Sn and other brittle pha- ses exist on the fracture interface of amorphous CUP7.7Sn5.4Nil4Si0.2B0.03 filler metal joint, therefore, reducing the number of fragile eompouncls will help to increase the shear stren^h of the, ioints.