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采用Al-7Si-20Cu钎料在真空钎焊条件下(不添加钎剂)对1060铝合金与Q235钢(镀Ni与不镀Ni)进行钎焊试验,研究了钎焊接头的显微组织及力学性能。研究结果表明,570℃钎焊5 min时,Fe表面不镀Ni时,Fe侧界面处生成厚度较大的Fe_2A_(l5)和FeAl_3脆性化合物,接头抗剪切强度仅为40 MPa。当Fe表面镀Ni后,Ni层的存在抑制了脆性Fe-Al化合物的形成,Fe侧界面生成Ni_2Al_3和NiAl_3化合物层,接头的剪切强度显著提高。延长钎焊时间,Ni_2Al_3层变薄,Ni Al3层增厚,接头剪切强度提高。当钎焊时间继续增加,Ni层消失,再次生成Fe-Al化合物,接头剪切强度降低。
The brazing test of 1060 aluminum alloy and Q235 steel (Ni-plating and Ni-free plating) under vacuum brazing condition (without addition of flux) was carried out with Al-7Si-20Cu brazing filler metal. Mechanical properties. The results show that when brazing at 570 ℃ for 5 min, Fe2A_ (15) and FeAl_3 brittle compounds are formed at the interface of Fe side when the surface of Fe is not coated with Ni, the joint shear strength is only 40 MPa. The presence of Ni layer suppresses the formation of brittle Fe-Al compounds when Ni is plated on the Fe surface, and the Ni2Al3 and NiAl3 compound layers are formed on the Fe side interface. The shear strength of the joints is significantly increased. Prolong the brazing time, thinning Ni_2Al_3 layer, Ni Al3 layer thickening, joint shear strength increased. When the brazing time continues to increase, the Ni layer disappears and the Fe-Al compound is formed again, and the shear strength of the joint decreases.