摘要
在化学元素周期表中Ge元素与Sn元素相邻,同为第Ⅳ主族元素,物理与化学性能有许多近似。文中在无铅钎料Sn2.5Ag0.7Cu中添加少量Ge元素(0.25,0.5,0.75,1.0,质量分数,%),设计、焊接了剪切试样,测试了接头抗剪强度,并且对断口做了扫描电镜和能谱分析。结果表明,添加少量Ge元素以后,接头的抗剪强度有显著提高;接头的断裂形式主要是韧性断裂,并且大都有二次裂纹;添加Ge元素后在剪切断口表面形成很多韧窝;金属间化合物Cu6Sn5对韧窝的形成有一定的作用。
In Periodic Table of the Elements,germanium(Ge) is adjacent to tin.They are both the elements in the main group Ⅳ and resemble each other in physical and chemical property.A little element Ge was added into lead-free solder Sn2.5Ag0.7Cu(0.25,0.5,0.75,1.0 wt%),and the shear test specimens were designed and welded.The joint shearing strengths were measured and fracture surfaces were analyzed by scanning electron microscope and energy dispersive X-ray analysis method.The result indicates that the shearing strength of the joint increases obviously.The joint fracture forms of the Sn-Ag-Cu-Ge lead-free solder are mainly ductile fracture,and most of them have secondary cracks.Lots of dimples formed on the fracture surface when adding element Ge,and IMC Cu6Sn5 play a part on the dimple forming.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2008年第9期59-62,共4页
Transactions of The China Welding Institution
关键词
无铅钎料
抗剪强度
断口
锗
lead-free solder
shearing strength
fracture surface
germanium
