镀铜/镍烧结钕铁硼永磁体与DP1180钢钎焊接头的组织与性能  

Microstructure and Properties of Soldered Joints of Cu/Ni-Coated Sintered-NdFeB Permanent Magnets and DP1180 Steel

作　　者：苏金龙 罗萃 阮野 邱小明[1] 邢飞[1,2] Su Jinlong;Luo Cui;Ruan Ye;Qiu Xiaoming;Xing Fei(Key Laboratory of Automobile Materials Ministry of Education,Jilin University,Changchun 130022,China;Shenzhen Research Institute of Jilin University,Shenzhen 518057,China;Shanghai Aerospace Control Technology Research Institute,Shanghai 201109,China)

机构地区：[1]吉林大学汽车材料教育部重点实验室,吉林长春130022 [2]吉林大学深圳研究院,广东深圳518057 [3]上海航天控制技术研究所,上海201109

出　　处：《稀有金属材料与工程》2024年第2期365-370,共6页Rare Metal Materials and Engineering

基　　金：Creation and Development Technology Project of Shenzhen,China(2021Szvup050);Shanghai Sailing Program(23YF1417400);2020 Renewal Program of Jilin University(419080520464)。

摘　　要：采用Zn-6Sn-5Bi钎料对镀Cu/Ni的烧结Nd Fe B永磁体和DP1180钢进行钎焊连接,对比分析了2种镀层条件下钎焊接头的微观组织和力学性能。结果表明,对于镀Cu的烧结Nd Fe B永磁体和DP1180钢的钎焊接头,Cu在钎料中扩散并与Zn、Fe反应生成脆性金属间化合物,导致钎缝中出现裂纹和孔洞。与无镀层时的烧结Nd Fe B永磁体和DP1180钢的钎焊接头相比,接头的剪切强度由61.9 MPa降低至52.3 MPa;对于镀Ni的烧结Nd Fe B永磁体和DP1180钢的钎焊接头,Ni集中分布在Nd Fe B一侧的界面处,并且由于Sn和Bi的扩散形成了不同的扩散层,其剪切强度提高至78.1 MPa。Zn-6Sn-5Bi alloy was used to solder DP1180 steel and NdFeB permanent magnet coated with Cu and Ni,and the microstructures and mechanical properties of the soldered joints under different coating conditions were compared and analyzed.Results show that for the soldered joint of sintered NdFeB permanent magnet with Cu coating and DP1180 steel,Cu diffuses in the solder and reacts with Zn and Fe to form brittle intermetallic compounds,resulting in cracks and holes in the soldering seam.The shear strength of the soldered joint of sintered NdFeB permanent magnet with Cu coating and DP1180 steel decreases to 52.3 MPa,compared with that without Cu coating(61.9 MPa).For the soldered joint of sintered NdFeB permanent magnet with Ni coating and DP1180 steel,Ni is concentrated at the interface of NdFeB side,different diffusion layers are formed due to the diffusion of Sn and Bi,and the shear strength of soldered joint increases to 78.1 MPa.

关 键 词：烧结NDFEB永磁体 金属镀层 钎焊接头 微观组织 剪切强度 

分 类 号：TG454[金属学及工艺—焊接]