研究Cu/SnBi/Cu焊点在电流密度分别为8×103,1×104和1.2×104A/cm2的作用下通电80 h后钎料基体内部金属间化合物(IMC)的形貌演变.结果表明:电流密度为8×103 A/cm2时,在焊点的阳极界面出现了大量的形状不规则的IMC,而在阴极界面并未有明显的IMC形成;当电流密度为1×104A/cm2时,阴极界面的IMC层呈扇贝状,有些IMC已经在界面处脱落,而阳极界面的IMC里层状,而且厚度要比阴极的薄;当电流密度为1.2×104A/cm2时,阳极界面的IMC厚度有所增加,但是阴极界面的IMC已经向钎料基体中进行了扩散迁移,使得界面变得凹凸不平.值得注意的是,随着电流密度的增加,在阳极形成的Bi层的厚度明显增加.
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