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稀土Ce加速Sn晶須生長的研究
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“十一五”國家科技支撐重點項目“含有毒有害材料元素材料替代技術”


Study of Rapid Growth of Tin Whisker Accelerated by Rare Earth Ce
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    摘要:

    稀土被認為是金屬中的“維他命”,在釬料中添加微量的稀土Ce可以顯著地改善釬料合金的綜合性能。然而,當釬料中添加過量的稀土時,將會發(fā)現(xiàn)Sn晶須的快速生長現(xiàn)象。結果表明,如果將Sn3.8Ag0.7Cu1.0Ce釬料內部的稀土相暴露于空氣中,稀土相將發(fā)生氧化而產(chǎn)生體積膨脹,釬料基體對體積膨脹的抑制作用將使稀土相內部產(chǎn)生巨大的壓應力從而加速Sn晶須的生長

    Abstract:

    Rare earth elements are recognized as the “vitamin” of metals, and trace amount of rare earth Ce can effectively improve the comprehensive properties of the solder alloy. However, rapid tin whisker growth has been found when excessive amount of rare earth were doped in the solder alloys. The results indicated that the rare earth-phase will be oxidized and induce volume expansion when Sn 3.8Ag0.7Cu1.0Ce solder was exposed in air, and the constraint action of the solder matrix on the volume expansion of the oxidized rare earth-phase will result in a compressive stress that will accelerate the growth of tin whiskers

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郝 虎,李廣東,史耀武,夏志東,雷永平,郭 福,李曉延.稀土Ce加速Sn晶須生長的研究[J].稀有金屬材料與工程,2009,38(5):866~869.[Hao Hu, Guangdong, Shi Yaowu, Xia Zhidong, Lei Yongping, Guo Fu, Li Xiaoyan. Study of Rapid Growth of Tin Whisker Accelerated by Rare Earth Ce[J]. Rare Metal Materials and Engineering,2009,38(5):866~869.]
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  • 收稿日期:2008-05-14
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