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材料工程  2014 

热循环对SnAgCu(纳米Al)/Cu焊点界面与性能影响

DOI: 10.3969/j.issn.1001-4381.2014.03.010, PP. 55-59

Keywords: 无铅钎料,界面反应,金属间化合物,失效路径

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Abstract:

研究了纳米0.1%(质量分数)Al颗粒对SnAgCu无铅钎料与铜基板之间界面反应的影响,研究两种无铅钎料界面在-55~125℃热循环过程中的生长行为及其焊点力学性能变化。结果表明随着热循环次数的增加,界面层金属间化合物的厚度明显增加,焊后界面层金属间化合物为Cu6Sn5相,在热循环过程中在Cu6Sn5和Cu基板之间出现Cu3Sn相。发现纳米Al颗粒的添加,界面层金属间化合物的厚度明显减少,纳米颗粒对界面层的生长具有明显的抑制作用。同时对焊点在热循环过程中的可靠性进行分析,发现焊点的拉伸力随着循环次数的增加逐渐降低,含纳米Al颗粒的焊点具有明显的优越性,在焊点服役期间,焊点失效路径为Cu6Sn5/Cu3Sn的界面处。

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