合金元素对AgCuZn系钎料合金组织与性能的影响

Effect of alloying elements on microstructure and property of AgCuZnSn brazing alloy

通过向AgCuZn系钎料合金中添加适量的合金元素Sn,Ni,P,研究了不同元素含量的Sn,Ni,P对AgCuZn系无镉钎料组织性能的影响。结果表明,随着Sn元素含量的增加,钎料的润湿铺展性能整体呈上升趋势;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。显微组织分析表明,AgCuZn系钎料合金微观组织主要由富Cu相、CuZn化合物相、Cu5.6Sn化合物相、Cu40.5Sn11化合物相和Ag的析出相组成,AgCuZn钎料合金中加入Sn元素后生成粗大的树枝晶,使钎料脆性增大;钎料合金中加入Ni元素,生成灰黑色的Ni3P化合物相,微观组织细化;P元素的加入生成灰色的CuP化合物相。

The Sn,Ni,P were added into AgCuZnSn brazing alloy. And the effects of Sn,Ni and P on the microstructure and property of AgCuZn cadmium-free brazing alloy system were investigated. The results showed that the wettability of the brazing alloy was improved with the addition of Sn. The addition of P could decrease the interfacial tension between liquid brazing alloy and specimen, and the wettability and fluidity were also improved. The microstructure of AgCuZn brazing alloy was consisted of Cu-rich phase, CuZn intermetallic compound, Cu 5.6 Sn intermetallic compound, Cu 40.5 Sn 11 intermetallic compound and Ag-rich phase. Dendrite that formed in the alloy microstructure make brazing alloy friable after the addition of Sn. The black Ni 3P compound was generated when Ni was added, and make microstructure homogeneous. The gray Cu 3P compound was generated when P was added.