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分别采用Zn-15Al,Zn-22Al,Zn-28Al,Zn-37Al和Zn-45Al钎料钎焊获得Cu/Al接头.利用SEM,EDS和XRD研究了Zn-Al钎料成分对Cu/Al接头中Cu母材/钎缝界面结构的影响,并系统阐述了Zn-Al钎料成分-接头界面结构-接头抗剪切强度之间的关系.研究发现,Cu/Zn-15Al/Al接头中Cu母材/钎缝界面结构为Cu/Al4.2Cu3.2Zn0.7,且Al4.2Cu3.2Zn0.7界面层较薄,其厚度为2~3μm,接头具有较高的抗剪切强度,达66.3 MPa.随着钎料中Al含量的提高,在Cu/Zn-22Al/Al接头界面处Al4.2Cu3.2Zn0.7界面层的厚度逐渐增大,甚至在Cu/Zn-28Al/Al接头的Al4.2Cu3.2Zn0.7界面层附近出现少量的Cu Al2,接头的抗剪切强度逐渐降低.当采用Al含量较高的Zn-37Al钎料钎焊Cu/Al接头时,Cu母材/钎缝界面结构转变为Cu/Al4.2Cu3.2Zn0.7/Cu Al2;脆性Cu Al2层的出现,使接头抗剪切强度大幅下降,为34.5 MPa.当采用Al含量最高的Zn-45Al钎料钎焊Cu/Al接头时,Cu母材/钎缝界面结构转变为Cu/Cu Al2,接头抗剪切强度最低,为31.6 MPa.
Cu / Al joints were obtained by soldering with Zn-15Al, Zn-22Al, Zn-28Al, Zn-37Al and Zn-45Al brazing respectively.The effects of composition of Zn-Al brazing filler metal on Cu / Al joints were studied by SEM, EDS and XRD. Cu / Zn-15Al / Al joints in Cu / Zn-15Al / Al joints were investigated systematically.The results show that the Cu-Zn- The base metal / brazing seam interface structure is Cu / Al4.2Cu3.2Zn0.7, and the interface layer of Al4.2Cu3.2Zn0.7 is thin, the thickness is 2 ~ 3μm, the joint has a high shear strength of 66.3 MPa. With the increase of Al content in the brazing filler metal, the thickness of interface layer of Al4.2Cu3.2Zn0.7 at Cu / Zn-22Al / Al joint interface gradually increases, even at Al4 .2Cu3.2Zn0.7 interface layer appears a small amount of Cu Al2, joint shear strength decreased gradually.When the use of high content of Zn-37Al brazing brazing filler metal Cu / Cu joint The interface structure was changed to Cu / Al4.2Cu3.2Zn0.7 / CuAl2. The appearance of brittle Cu Al2 layer caused the joint shear strength to decrease significantly to 34.5 MPa. When Zn-45Al solder with the highest Al content was used for brazing Cu / Al joints, Cu base material / solder joint interface structure changes to Cu / Cu Al2, joints Minimum shear strength is 31.6 MPa.