不同长径比纳米银线对焊料金属间化合物形貌及厚度的影响  

Effect of Different Aspect Ratios of Silver Nanowires on Morphology and Thickness of Solder Intermetallics

作　　者：白海龙 赵梅莉 张欣 周蝶 陈东东[3] 祖梓翀 赵玲彦 严继康 郭胜惠[1] BAI Hailong;ZHAO Meili;ZHANG Xin;ZHOU Die;CHEN Dongdong;ZU Zichong;ZHAO Lingyan;YAN Jikang;GUO Shenghui(Faculty of Metallurgy and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;R&D Center of Yunnan Tin Group(Holding)Co.,Ltd.,Kunming 650000,China;Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Tin Industry Tin Material Co.,Ltd.,Kunming 650217,China;School of Engineering,Southwest Petroleum University,Nanchong 637001,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,昆明650093 [2]云南锡业集团(控股)有限公司研发中心,昆明650000 [3]昆明理工大学材料科学与工程学院,昆明650093 [4]云南锡业锡材有限公司,昆明650217 [5]西南石油大学工程学院,四川南充637001

出　　处：《有色金属工程》2022年第12期12-21,共10页Nonferrous Metals Engineering

基　　金：云南省重大专项(2018ZE004);云南省创新团队(202105AE160028)。

摘　　要：为了提高汽车电子焊料的可靠性,研究了添加一维纳米线对焊料金属间化合物(IMCs)形貌及厚度的影响。通过添加不同长径比的纳米银线(AgNWs),制备了SAC3005-x AgNWs复合焊点。采用扫描电子显微镜(SEM)观察纳米银线的表面形貌,采用金相显微镜观察焊点的显微组织。结果表明:PVP与硝酸银摩尔比为6.0时,合成的纳米银线长径比和均匀性更好,d=30 nm,L=4~20μm;随着时效时间的延长,Cu_(6)Sn_(5) IMCs出现平面化现象;添加纳米银线可以抑制Cu_(6)Sn_(5) IMCs生长,抑制作用随着纳米银线长径比增大而减弱,d=80 nm,L=4~23μm时抑制效果最好。这是由于Ag原子和Sn原子的化学亲和力高于Sn原子和Cu原子的化学亲和力,添加纳米银线,Ag原子浓度增加,生成更多的Ag_(3) Sn IMCs抑制Cu_(6)Sn_(5) IMCs的生长,纳米银线长径比增大容易发生团聚、打结,扩散速率减慢,抑制作用减弱。In order to improve the reliability of automotive electronic solders,the effect of adding one dimension nanowires on the morphology and thickness of solder intermetallic compounds(IMCs)was studied.SAC3005-x AgNWs composite solder joints were prepared by adding silver nanowires(AgNWs)with different aspect ratios.Scanning Electron Microscope(SEM)was used to characterize the surface morphology of silver nanowires,and metallographic microscope was used to observe the microstructure of solder joints.The results showed that when the molar ratio of PVP to silver nitrate was 6.0,the length diameter ratio and uniformity of the synthesized silver nanowires were better,d=30 nm,L=4~20μm;With the prolongation of aging time,Cu_(6)Sn_(5) IMCs appear planarization;The addition of silver nanowires can inhibit the growth of Cu_(6)Sn_(5) IMCs.The inhibition decreases with the increase of the aspect ratio of silver nanowires.The inhibition effect is best when d=80 nm and L=4~23μm,which is because the chemical affinity of Ag atoms and Sn atoms is higher than that of Sn atoms and Cu atoms.When silver nanowires are added,the concentration of Ag atoms increases,and more Ag_(3) Sn IMCs are generated to inhibit the growth of Cu_(6)Sn_(5) IMCs.When the length diameter ratio of silver nanowires increases,agglomeration and knotting easily occur,the diffusion rate slows down,and the inhibition is weakened.

关 键 词：纳米银线 长径比 IMCs 厚度 化学亲和力 

分 类 号：TG425.1[金属学及工艺—焊接]