稀土元素Pr对Ag基焊料组织与性能的影响  

Effect of Rare Earth Pr on the Microstructure and Properties of Ag Based Filler Metal

作　　者：张亮 龙伟民 钟素娟 王蒙 董宏伟 Zhang Liang;Long Weimin;Zhong Sujuan;Wang Meng;Dong Hongwei(Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd,Zhengzhou 450001,China;School of Mechatronic Engineering,Jiangsu Normal University,Xuzhou 221116,China)

机构地区：[1]郑州机械研究所有限公司,河南郑州450001 [2]江苏师范大学机电工程学院,江苏徐州221116

出　　处：《稀有金属材料与工程》2022年第10期3905-3909,共5页Rare Metal Materials and Engineering

基　　金：先进焊接与连接国家重点实验室开放课题重点项目(AWJ-19Z04)。

摘　　要：Ag基焊料因其良好的加工性能和力学性能成为硬钎焊主要连接材料之一,研究了稀土元素Pr对BAg30焊料组织和性能的影响。结果表明:微量的稀土元素Pr可以促使焊料的熔化温度提高约3℃,提高焊料在钢基板表面的润湿铺展面积,显著提高焊点的抗剪切强度,但是过量的稀土元素会降低焊料的润湿性和焊点抗剪切强度。通过优化分析证实稀土元素Pr的最佳添加量(质量分数)为0.12%左右。对BAg30-xPr焊料SEM组织分析,发现稀土元素Pr含量≤0.12%,显著细化焊料基体组织,当稀土元素含量大于0.12%,焊料的组织就被显著地粗化。对BAg30-1.0Pr焊料进行元素分析,证实元素在焊料内部均匀分布,存在PrCu_(6)相。Due to the perfect processing property and sufficient mechanical performance,Ag based filler metal is one of the main jointing materials for brazing.The effect of rare earth Pr on the microstructure and properties of BAg30 filler metal was investigated.The results show that a trace amount of rare earth Pr can increase the melting temperature with~3℃,improve the wetting spreading area of filler metal on the surface of steel substrate and obviously increase the shear strength of brazed joint.But excessive rare earth Pr would decrease the wettability and shear strength.Based on the content optimization analyze of rare earth Pr,it is found that the optimal addition amount of rare earth Pr is about 0.12%.With the observation of SEM microstructure,it is indicated that the addition of rare earth Pr(≤0.12%)can refine the microstructure of filler metal.When the content of Pr is more than 0.12%,the microstructure will be coarsening obviously.The elements mapping of BAg30-1.0Pr filler metal demonstrates the uniform distribution of elements and the precipitation of PrCu6 phase.

关 键 词：Ag基焊料 润湿性 抗剪切强度 微观组织 

分 类 号：TG454[金属学及工艺—焊接]