镍对Ag-Cu-Sn-In钎料组织及加工性能的影响

Influence of Ni on microstructure and processing performance of Ag-Cu-Sn-In brazing alloy

在制备Ag-Cu-Sn-In钎料、分析钎料组织的基础上,研究了添加Ni元素对钎料组织与加工性能的影响.结果表明,Ag-Cu-Sn-In合金组织由粗大的β-Cu枝晶、弥散分布于枝晶间的(α-Ag)相及少量Ag5Sn相组成.镍的添加可使钎料组织明显细化,熔点略有升高,并对钎料加工性能产生显著影响.随着镍含量的增大,合金形变率增大,钎料加工性能提高,含0.2%Ni的合金形变率达到峰值;继续升高镍含量,合金组织逐渐变得粗大,钎料加工性能变差.0.2%Ni钎料的固、液相线分别升高18℃和8℃,熔化温度区间减小20℃.采用退火轧制工艺,0.2%Ni钎料可轧制成厚为50～80μm的薄带.镍的适量添加可解决因银含量降低而引起的钎料加工性能恶化问题.

Influence of Ni on the microstructure and processing performance of Ag-Cu-Sn-In brazing alloy was investigated.The microstructures of Ag-Cu-Sn-In of solder were composed of β-Cu coarse dendrite,(α-Ag) distributing in the interdendritic space and little Ag5Sn.By adding Ni element,the grains refined,the melting point rised a little,and processability was influenced evidently.With Ni content increasing,rate of deformation is bigger,processability of brazing alloy is better.As Ni content was 0.2%,the rate of deformation reached maxinum.Ni content sequentially increasing,microstructures of brazing alloy are becoming bulkily,and processability is worse.With 0.2% Ni Content,the temperature of solidus and liquidus of alloy foils increased respectively by 18 ℃ and 8 ℃,the temperature interval decreased by 20 ℃.After annealing treatment,brazing alloy with 0.2%Ni can be rolled into foils of 50-80 μm thickness.