以添加了5％(质量分数,下同)CsF-AlF3共晶钎剂的Zn粉为原料,采用冷喷涂技术在5083铝合金表面制备涂层,喷涂后的5083铝板在530℃进行钎焊连接.采用扫描电子显微镜结合能谱仪对涂层的显微结构及钎焊后的接头组织形貌进行观察与分析.结果表明:涂层与5083基体连接致密,钎剂颗粒呈絮状存在于Zn粒子交界面处;由于涂层对5083基体的保护,钎焊时5083基体表面没有出现Mg元素上浮现象,表面未形成复杂的氧化膜,530℃喷涂后的5083与1060可成功实现连接;钎焊接头组织均匀,主要由α铝基固溶体和β富锌基固溶体组成,存在少量孔洞缺陷.
With Zn and 5wt％ CsF-A1Fa eutectic flux mixed powders as raw materials,coatings on 5083 aluminum alloy were prepared by cold gas dynamic spray,then the 5083 aluminum alloy deposited coatings were brazed at 530 ℃.The microstructure and composition of the coatings and brazing joint were characterized by SEM and EDS.The results reveal that the combination between coatings and 5083 aluminum alloy substrate is tight,the CsF-AlF3 eutectic flux particles appear at the interface of Zn particles.Due to the protection of coatings,the Mg element isn't enriched at the 5083 aluminum alloy outermost surface during brazing and the complex oxide film doesn't form,the bonding of 5083 aluminum alloy deposited coatings and 1060 aluminum alloy can be realized.The brazing joint has a homogeneous microstructure consisting of aluminum based solid solution (α phase) and zinc based solid solution (β phase),only a little of cavities defects occur.
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