Ni镀层对Cu/Al钎焊接头界面组织与力学性能的影响  

Effect of Ni-P Coating on Microstructure and Mechanical Properties of Cu/Al Brazed Joints

作　　者：张学智[1] 黄玲玲 李云鹏 于卓立 曹新娜 宋路阳 安鹏涛 魏世忠[1] ZHANG Xuezhi;HUANG Lingling;LI Yunpeng;YU Zhuoli;CAO Xinna;SONG Luyang;AN Pengtao;WEI Shizhong(National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials,Henan University of Science and Technology,Luoyang 471023,China;School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;State Key Laboratory of Advanced Brazing Filler Metals&Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd,Zhengzhou 450001,China)

机构地区：[1]河南科技大学金属材料磨损控制与成型技术国家地方联合工程研究中心,河南洛阳471023 [2]河南科技大学材料科学与工程学院,河南洛阳471023 [3]郑州机械研究所有限公司新型钎焊材料与技术国家重点实验室,河南郑州450001

出　　处：《河南科技大学学报（自然科学版）》2024年第4期23-29,M0003,M0004,共9页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(U2341258);河南省科技厅自然科学基金项目(232300420088);河南省科技攻关计划(222103810032)。

摘　　要：为探究Ni-P镀层对Cu/Al异种金属钎焊界面反应的影响,采用化学镀方法对T2紫铜进行化学镀镍处理,使用BAl88Si药芯钎料通过感应钎焊方法钎焊Cu/Al接头。采用扫描电子显微镜和电子背散射衍射技术对接头进行微观组织观察与物相分析,并对接头进行力学性能测试,分析镀层对Cu/Al接头微观组织结构及力学性能的影响,探讨钎焊过程中不同钎焊接头的界面形成机理。结果表明:无镀层接头在界面处形成了Cu_(9)Al_(4)和CuAl_(2)两层金属间化合物,有镀层接头界面处形成了Al_(2)Ni和Al_(3)Ni金属间化合物。无镀层接头的抗拉强度可达56.4 MPa,优于有镀层接头。接头均发生脆性断裂,断裂位置从无镀层接头的CuAl2和α-Al固溶体的界面处转变为有镀层接头的Al3Ni金属间化合物处。To investigate the effect of Ni-P coating on the interfacial reactions in Cu/Al dissimilar metal brazing,a chemical plating method was employed to nickel plate T2 copper,followed by brazing of the Cu/Al joints using the induction brazing technique with BAl88Si flux-cored filler metal.Scanning electron microscopy and electron backscatter diffraction were utilized for microstructural observation and phase analysis of the joints.Mechanical testing was performed to analyze the influence of the coating on the microstructure and mechanical properties of the Cu/Al joints,while also exploring the interface formation mechanism of different brazing joints during the brazing process.The results reveal the formation of intermetallic compounds Cu_(9)Al_(4) and CuAl_(2) at the interface of uncoated joints,whereas intermetallic compounds Al_(2)Ni and Al_(3)Ni are formed at the interface of the coated joints.The tensile strength of uncoated joints reaches to 56.4 MPa,outperforming that of coated joints.Brittle fractures occurre in all joints,with the fracture location transitioning from the interface of CuAl_(2) and theα-Al solid solution in uncoated joints to the Al 3Ni intermetallic compound in coated joints.

关 键 词：Cu/Al异种金属 NI-P镀层 金属间化合物 微观组织 力学性能 

分 类 号：TG454[金属学及工艺—焊接]