研究了焊粉粒度分布和氧含量对锡膏稳定性的影响.试验采用Malcom粘度计测试不同保存时间锡膏的粘度变化;采用锡膏搅拌机模拟锡膏使用过程,观察锡膏状态随搅拌时间的变化.实验结果表明焊粉D50越小,所制备锡膏的使用稳定性越好,但锡膏的储存稳定性变差,锡膏呈现沙化状态;焊粉氧含量越低,所制备锡膏的储存和使用稳定性均较好.试验对搅拌沙化后的锡膏进行了金属含量测定,结果表明焊粉与助焊剂之间的化学反应是锡膏沙化的主要原因.
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