对Sn-3.5Ag-0.7Cu/Ni-P界面上的焊点进行了150℃固相老化和250℃液相回流老化实验.两种条件下焊料体内和界面处金属间化合物的成分、长大速率及形貌均有较大差异.在液相回流条件下金属间化合物长大更快,对焊点的可靠性有较大的影响.延长固相老化时间,焊点内生成大尺寸的Ag3Sn相;高温液相回流有Ni3P层生成,降低焊点的焊接强度.
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