P,稀土La对AgCuZnSn钎料合金组织与性能的影响

Effect of P and rare-earth La on microstructure and property of AgCuZnSn brazing alloy

通过向AgCuZnSn钎料合金中添加适量的元素P和稀土元素La,研究了不同含量的P元素,稀土La对AgCuZnSn系无镉钎料组织性能的影响。结果表明,P元素的加入可以降低液态钎料与试件间的表面张力,改善钎料的润湿性和流动性;稀土La的加入,可以改善钎料的润湿性,但随稀土含量的增加,钎料的润湿性能降低。显微组织分析表明,AgCuZnSn钎料合金微观组织主要由CuZn化合物相、Cu5.6Sn化合物相和Ag的析出相组成,AgCuZnSn钎料合金中加入P元素后生成黑灰色的Cu3P化合物,微量稀土La的加入可以细化钎料组织,抑制金属间化合物的生长。

The P and rare-earth La were added into AgCuZnSn brazing alloy.The effect of P and La on the microstructure and property of AgCuZnSn cadmium-free brazing alloy system was investigated.The results showed that the addition of P could decrease the interfacial tension between liquid brazing alloy and specimen,and the wettability and fluidity were also improved.With the addition of La,the wettability of the brazing alloy was improved.while the wettabilty decreased as the content of La increased.The microstructure of AgCuZnSn brazing alloy consisted of CuZn intermetallic compound,Cu5.6Sn intermetallic compound and Ag-rich phase.The black Cu3P compound was generated when P was added.And addition of La could make microstructure homogeneous,and restrain the growth of intermetallic compound.