摘要随着科学技术发展的日新月异,Sn-Zn系无铅钎料作为Sn-Pb系钎料最有潜力的替代者之一,其优异性能越来越受到人们的重视。但Sn-Zn系钎料仍存在润湿性差、抗氧化性能及抗腐蚀性能弱等缺陷。通过向Sn-Zn系钎料中添加其他微量元素有利于其性能提升。87772
本文主要针对Sn-9Zn无铅钎料,通过添加稀土元素Nd,对比了添加不同含量的Nd对焊接结果的影响,使用光学显微镜对钎缝进行了微观组织观察和分析。 结果显示,在钎料中添加适量的稀土Nd元素,有助于润湿性能的改善,Nd元素质量分数为0。1%时,钎料润湿性能最佳。且随着Nd元素的加入,钎料基体组织得到细化,Nd%=0。1%时,钎料组织最为均匀、细小。Nd元素的添加还可改善焊点的力学性能。因此Nd元素在Sn-9Zn无铅钎料中的最佳添加量为0。1%左右。
关键词 无铅钎料 Sn-9Zn 稀土元素Nd 微观组织
毕业设计说明书外文摘要
Title Study on the microstructure and Ndoperties of rare Earth Nd
department of SnZn lead-free solder
Abstract
Along with the rapid scientific and technological development, Sn-Zn-based solder’s excellent performance get more and more people’s attention as the most Ndomising alternative of Sn-Pb-based solder。 However, Sn-Zn-based solder remains poor wetting, oxidation resistance and corrosion resistance and weak defects。It’s beneficial to performance by adding other trace lements to the Sn-Zn-based brazing filler。
This article mainly aims at Sn-9Zn lead-free solder,by adding rare earth elements Nd, Compare the effects of different content of Nd welding results, using the brazing seam microstructure observation and analysis。 The results showed that adding an apNdoNdiate amount of rare earth elements Nd can help to imNdove the wetting Ndoperties, Nd element content of 0。1%, the best performance of solder wetting。 And with the added element of Nd, solder matrix structure is refined, when Nd% = 0。1%, the most homogeneous solder organization, fine。 Add Nd elements also imNdove the mechanical Ndoperties of solder joints。 So Nd element in the Ndeferred dosage is about 0。1% Sn-9Zn lead-free brazing alloy。
Keywords Lead-free solder Sn-9Zn Nd microstructure
目 次
1 绪论 1
1。1 引言 1
1。2 Sn-Zn系无铅钎料特点 1
1。4 本课题研究内容 7源-于,优Y尔E论W文.网wwW.yOueRw.com 原文+QQ752018`766
2 试验材料与方法 8
2。1 钎料的制备与试验方法 8
2。2 钎料润湿性能试验 8
2。3 微焊点力学性能试验 9
2。4 显微组织分析 8
3 稀土Nd添加量对Sn-9Zn无铅钎料组织及性能影响 12
3。1 稀土Nd添加量对Sn-9Zn无铅钎料润湿性能影响 12
3。2 稀土Nd添加量对Sn-9Zn无铅钎料组织影响 14
4 稀土Nd添加量对Sn-9Zn组织及焊点力学性能影响