稀土相表面特殊形态锡晶须生长现象  

Special tin whisker growth on surface of oxidized RE-phases

作　　者：田君[1] 李东南[1] 李巍[1] 郝虎[2] 

机构地区：[1]福建工程学院材料系,福州350108 [2]北京工业大学机电学院,北京100124

出　　处：《焊接学报》2012年第4期73-76,116-117,共4页Transactions of The China Welding Institution

基　　金：福建省教育厅资助项目(JB08191);福建工程学院院基金项目(GY-Z0744)

摘　　要：在Sn3.8Ag0.7Cu钎料中添加过量的稀土Ce和Er元素会在其内部形成尺寸较大的稀土相CeSn3和ErSn3.将钎料合金Sn3.8Ag0.7Cu1.0Ce/Er的铺展试样沿中心剖开,利用金相水砂纸及专用抛光液抛光后,将制备好的试样在空气中分别进行室温与150℃时效处理.分析了时效处理过程中稀土相CeSn3及ErSn3表面锡晶须的生长行为.结果表明,在稀土相的表面出现了大量规则的针状及线状锡晶须,它们在生长过程中始终保持了恒定的截面.试验中还发现了一些特殊形态的锡晶须,如锡晶须的分枝、合并以及锡晶须的搭接现象.CeSn3 and ErSn3 phases with large size were precipitated in the Sn-3.8Ag-0.7Cu-1.0Ce/Er solder alloys.The aging treatment at room temperature and 150℃ was carried out for the prepared sample of Sn-3.8Ag-0.7Cu-1.0Ce/Er solder alloy,respectively.After various storage periods,the tin whiskers appeared on the specimen surfaces were analyzed by scanning electron microscopy（SEM）.The results indicated that a great number of needle-like and thread-like tin whiskers were formed on the surface of the oxidized RE phases.It was noteworthy to mention that these tin whiskers kept the constant cross section during growth process.However,besides these regular tin whiskers,some new ones with special morphology,such as lapped whiskers,branch and combination of whiskers,were also found.

关 键 词：稀土相 时效 锡晶须 形态 

分 类 号：TN601[电子电信—电路与系统]