Al/Zn-3Al/Cu无钎剂钎焊接头界面冶金反应行为及性能研究  

Study on Interfacial Reaction Behavior and Properties of Al/Zn-3Al/Cu Fluxless Brazed Joint

作　　者：符永高 王玲 肖勇[2] 万超 杜彬 高锐[3] 

机构地区：[1]中国电器科学研究院有限公司,广东广州510300 [2]哈尔滨工业大学深圳研究生院,广东深圳518129 [3]辽源职业技术学院,吉林辽源136200

出　　处：《电子工艺技术》2014年第6期326-329,333,共5页Electronics Process Technology

基　　金：国家"十二.五"科技支撑计划项目(项目编号:2012BAF01B04)

摘　　要：研究了采用Zn-3Al钎料钎焊Al/Cu异质金属时,钎焊温度对接头冶金反应行为及性能的影响。结果表明,在400℃超声钎焊时,接头的钎缝层由不均匀分布的α-Al和CuZn5树枝状晶以及Zn-Al共晶基体组成,接头的Cu界面处形成了较厚的扇贝状CuZn5金属间化合物层和Cu基扩散层。增加钎焊温度到440℃时,接头的钎缝层转变为由均匀弥散分布的CuZn5、α-Al和Al4.2Cu3.2Zn0.7相组成,接头Cu界面处的金属间化合物层则由CuZn5相转变为锯齿状的Al4.2Cu3.2Zn0.7相。进一步增加钎焊温度至480℃引起了接头显微组织的粗化和钎缝层中缩孔的形成。性能测试表明,与在400℃和480℃超声钎焊相比,在440℃超声钎焊获得的Cu/Al接头有着最佳的拉伸强度值(78.9 MPa)The metallurgic reaction behavior and properties of Al/Zn-3Al/Cu dissimilar joints ultrasonically brazed at different temperatures were investigated. Results showed that, in the joint brazed at 400℃, the ifller metal layer was composed of Zn-Al eutectic matrix and randomly distributedα-Al and CuZn5 dendrites, the Cu interfacial layer was composed of thick CuZn5 intermetallic compounds layer and Cu based diffusion layer. Increasing the brazing temperature to 440℃, however, the ifller metal layer was composed of refined and dispersed CuZn5,α-Al and Al4.2Cu3.2Zn0.7 phases, and the CuZn5 layer on the Cu surface changed to a serrated Al4.2Cu3.2Zn0.7 intermetallic compounds layer. Further increase the brazing temperature to 480℃ resulted in the coarsening of the microstructure and the creation of cavities in the ifller metal layer. Properties tests showed that, compared with the joints brazed at 400℃ and 480℃, the joint brazed at 440℃ had the highest tensile strength （78.9 MPa） and corrosion resistance.

关 键 词：Cu/Al接头 ZN-AL钎料 超声钎焊 显微结构 力学性能 抗腐蚀性 

分 类 号：TG40[金属学及工艺—焊接]