采用润湿平衡法,选用商用水洗钎剂研究了Sn-2.5Ag-0.7Cu-0.1RE-xNi钎料合金在Cu引线和Cu基板上的润湿特性.结果表明,当Ni添加量为0.05％ ～0.1％时,Sn-2.5Ag-0.7Cu-0.1RE钎料合金中在Cu引线上具有较短的润湿时间,较小的润湿角,较大的润湿力;在Cu基板上具有较小的润湿角和较大的铺展面积;焊点界面区Cu6Sn5厚度小而平整;其润湿特性满足现代表面组装技术对无铅钎料润湿性能的要求.
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