碳纳米管对Ag-Cu-Ti焊料组织与性能的影响  

Effect of CNTs on Microstructure and Properties of Ag-Cu-Ti Filler Metal

作　　者：张亮 龙伟民 钟素娟 李志豪 李木兰 Zhang Liang;Long Weimin;Zhong Sujuan;Li Zhihao;Li Mulan(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9期3492-3496,共5页Rare Metal Materials and Engineering

基　　金：河南省特聘研究员项目。

摘　　要：Ag-Cu-Ti合金作为活性焊料可以实现金属-陶瓷连接,选择碳纳米管作为添加材料,以Ag-26.7Cu-4.5Ti作为基体材料,在Ag-Cu-Ti焊料中添加碳纳米管,研究了不同含量的碳纳米管(CNTs)对Ag-Cu-Ti焊料组织和性能的影响。结果表明:添加碳纳米管可以明显降低焊料在钢基板表面的润湿铺展面积,焊料的熔化温度可以提高约9℃,显著提高焊点的抗剪切强度,当纳米管添加质量分数为0.2%时,抗剪切强度达到最大值,提高幅度达49.3%。对Ag-Cu-Ti-x CNTs(x=0,0.05,0.1,0.2,0.5,1.0,质量分数,%,下同)焊料组织SEM分析,发现适量碳纳米管(≤0.1%)显著细化焊料基体组织,过量的碳纳米管导致焊料组织明显粗化。对Ag-Cu-Ti-x CNTs焊点断口形貌进行分析表明,Ag-Cu-Ti-x CNTs(x=0.05,0.1,0.2,0.5)焊点呈现明显的韧性断裂特征,Ag-Cu-Ti和Ag-Cu-Ti-1.0CNTs焊点则表现出明显的混合断裂特征。Ag-Cu-Ti alloy can be used as active filler metal to achieve metal-ceramic bonding.Carbon nanotubes(CNTs) were selected as the additive material and Ag-26.7Cu-4.5Ti was used as the matrix material.The effect of CNTs content on the microstructure and properties of Ag-Cu-Ti filler metal was investigated.The results indicate that CNTs can reduce the wetting spreading area of filler metal on the surface of steel substrate,and increase the melting temperature by ~9 ℃,and obviously increase the shear strength of brazed joint.When the content of CNTs is 0.2%,the shear strength reaches the maximum value,and the increase range is 49.3%.Moreover,SEM analysis indicates that the addition of CNTs can refine the microstructure of filler metal,but excessive CNTs would coarsen the microstructure of Ag-Cu-Ti.For the fracture morphologies of Ag-Cu-Ti-x CNTs(x=0,0.05,0.1,0.2,0.5,1.0,wt%) brazed joints,obvious ductile fracture mode can be observed on the fracture surface of Ag-Cu-Ti-x CNTs(x=0.05,0.1,0.2,0.5) brazed joints.However,the fracture mechanism of Ag-Cu-Ti and Ag-Cu-Ti-1.0CNTs brazed joints shows obvious mixed fracture mode.

关 键 词：AG-CU-TI 熔化温度 剪切强度 韧性断裂 

分 类 号：TG454[金属学及工艺—焊接]