Sn-37PbNi界面反应行为的相图计算分析

Analysis of interfacial reactions between Sn-37Pb and Ni by phase diagram calculation method

摘要: 采用ThermoCalc软件及相关数据库,将相图计算应用到SnPb共晶焊料与N基体的界面反应行为的分析当中。依据局部平衡理论,通过亚稳平衡状态的计算和中间相形成驱动力大小的比较,预测出了500K焊接温度下Sn37Pb与Ni基体界面处金属间化合物的形成序列为Ni₃Sn₄→Ni₃Sn₂→Ni₃Sn。通过SnPbNi三元系500K和423K下等温截面的计算,预测出了润湿反应和固态时效反应过程中系统的相转变的情况计算与试验结果吻合较好。

Abstract: Through Thermo-Calc software and the related database,phase diagrams were calculated to analyze the interfacial reactions between Sn-Pb eutectic alloy and Ni matrix.By calculating metastable equilibrium between liquid Sn-37Pb and Ni according to the local equlibria theory,the compounds forming sequence has been predicted,which is Ni₃Sn₄→Ni₃Sn₂→Ni₃Sn.By calculating the isothermal section at 500 K and 423 K respectively,the information of the phase transformation during wetting and aging reaction has been obtained.All above agrees with the previous experimental results well.