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采用真空熔敷法在304不锈钢表面制备Cu-Ni涂层,然后以Cu-Ni涂层为中间层,扩散连接304不锈钢与6063铝合金。利用光学显微镜、SEM及EDS,研究了不锈钢/Cu-Ni涂层/铝合金接头的界面显微组织特征及成分分布。结果表明,与不锈钢母材熔合的Cu-Ni涂层中,形成了宽约4μm的Fe、Cr、Ni元素扩散带;与Cu-Ni涂层扩散结合的铝母材中则形成了两层化合物,靠近结合线的化合物层厚约1μm,主要由CuAl2和CuAl组成;远离结合线的化合物层厚约3μm,主要由CuAl2组成;没有在铝合金母材中检测到Ni原子。Al原子扩散进入Cu-Ni涂层的距离约3μm。
The Cu-Ni coating was prepared on the surface of 304 stainless steel by vacuum deposition method. Then the Cu-Ni coating was used as the intermediate layer to diffuse and connect 304 stainless steel and 6063 aluminum alloy. The microstructure and composition distribution of stainless steel / Cu-Ni coating / aluminum alloy joint were studied by means of optical microscope, SEM and EDS. The results show that the diffusion zone of Fe, Cr and Ni with a width of about 4μm is formed in the Cu-Ni coating fused with the stainless steel base material. Two layers of compound are formed in the aluminum base material diffused and bonded with the Cu-Ni coating , The compound layer close to the bond line has a layer thickness of about 1 μm and is mainly composed of CuAl2 and CuAl; the compound layer away from the bond line has a layer thickness of about 3 μm and is mainly composed of CuAl2; no Ni atom is detected in the aluminum alloy base material. The diffusion of Al atoms into the Cu-Ni coating is about 3 μm.