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纳米Ag颗粒/In-3Ag复合焊料的微观组织演变

, PP. 147-154

Keywords: In-3Ag焊料,纳米Ag颗粒,微观组织,多次回流,复合焊料

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Abstract:

通过外向法制备纳米Ag颗粒/In-3Ag复合焊料,研究在多次回流过程中,添加不同含量的纳米Ag颗粒对In-3Ag焊料焊点基体组织和界面IMC层(intermetalliccompound)的影响规律,采用SEM、HRTEM、能量色散仪(EDS)和电子探针(EPMA)分别对焊点基体及IMC层的微观结构及成分进行观察和分析。研究结果表明:纳米Ag颗粒能诱发晶粒成核,多次回流后,复合焊料基体中颗粒状二次相AgIn2没有明显长大现象;通过塞积扩散通道和表面吸附效应,纳米Ag颗粒能显著抑制焊料界面IMC层在多次回流过程的生长;纳米Ag颗粒的合适添加量为0.5%(质量分数,下同),当添加1%时,颗粒团聚,导致界面处出现球形AgIn2,降低焊料的力学性能。

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