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

关键词:  钎料合金  微观组织  润湿性能

Key words:  brazing alloy  microstructure  wettability

摘要:

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、Cu_5.6Sn化合物相、Cu_40.5Sn₁₁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Cu₃P化合物相。

Abstract:

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_40.5Sn₁₁ intermetallic compound and Ag-rich phase.Dendrite that formed in the alloy microstructure make brazing alloy friable after the addition of Sn.The black Ni₃ P compound was generated when Ni was added, and make microstructure homogeneous.The gray Cu₃ P compound was generated when P was added.