稀土相RE-Sn表面Sn晶须的生长规律  

Growth Law of Tin Whiskers on the Surface of the Oxidized RE-Sn Phases

作　　者：郝虎[1] 郭福[1] 徐广臣[1] 史耀武[1] 宋永伦[1] 

机构地区：[1]北京工业大学,北京100124

出　　处：《稀有金属材料与工程》2012年第8期1421-1425,共5页Rare Metal Materials and Engineering

基　　金：北京市教育委员会科技计划重点项目(KZ200910005004);中国博士后科学基金(20100480172)

摘　　要：将稀土相CeSn3、LaSn3、(La0.4Ce0.6)Sn3及ErSn3暴露于空气中,研究在时效处理过程中其表面Sn晶须的生长规律。结果表明:室温时效过程中,在稀土相的表面均出现了Sn晶须的生长现象,且稀土相LaSn3的表面倾向于形成包状和扭结状的Sn晶须,稀土相CeSn3和(La0.4Ce0.6)Sn3的表面倾向于形成针状和扭结状的Sn晶须,而稀土相ErSn3的表面倾向于形成大尺寸的杆状和棒状Sn晶须。150℃时效过程中,稀土相CeSn3、LaSn3和(La0.4Ce0.6)Sn3的表面没有出现Sn晶须的生长现象,而稀土相ErSn3的表面出现了大量的小尺寸线状Sn晶须。综上所述,稀土相的氧化倾向决定了其表面Sn晶须的生长规律。The growth law of tin whiskers on the surface of the oxidized CeSn 3,LaSn 3,（La 0.4 Ce 0.6）Sn 3 and ErSn 3 precipitates was investigated during the aging.The results indicate that during aging at room temperature,rapid tin whisker growth was found on all of the oxidized RE-Sn surfaces,hillocks and kinked whiskers were easily formed on the oxidized LaSn 3 surface,needle-like and kinked whiskers were easily formed on the oxidized CeSn 3 and（La 0.4 Ce 0.6）Sn 3 surfaces,especially,large sized rod-like and stick-like whiskers were easily formed on the surface of the oxidized ErSn 3 phase.During aging at 150 ℃,no whiskers were found on the surfaces of the oxidized CeSn 3,LaSn 3,（La 0.4 Ce 0.6）Sn 3 phases.However,a great number of thread-like whiskers were formed over the whole surface of the oxidized ErSn 3 phase.In conclusion,the oxidation tendency of RE-Sn phases dominates the growth law of whisker on the oxidized RE-Sn surface.

关 键 词：SnAgCu钎料 稀土 SN晶须 形态 

分 类 号：TG156.92[金属学及工艺—热处理]