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研究了微量Zn颗粒对Sn-0.7Cu钎料焊点微观组织、钎料铺展性能及Cu/Sn-0.7Cu-x Zn/Cu接头力学性能的影响。结果表明:适量Zn颗粒的添加可以细化钎料组织,减小界面IMC的厚度,提高钎料的铺展性能和硬度;过量Zn的添加则会粗化钎料组织,增大界面IMC的厚度,降低钎料的铺展性能和硬度值;接头抗拉强度随Zn的添加呈先增大后减小的趋势。当Zn含量小于0.20wt%拉伸断口类型为韧断,超过0.20wt%,拉伸断口类型为脆断。Zn的最佳添加量为0.20 wt%。
The effects of Zn particles on the microstructure, solder spreading and mechanical properties of Cu / Sn-0.7Cu-xZn / Cu joints were studied. The results show that proper addition of Zn particles can refine the brazing filler metal, reduce the thickness of IMC and improve the spreading performance and hardness of brazing filler metal. Excess Zn addition will roughen the brazing filler metal and increase the thickness of IMC, Reduce the spreadability and hardness of the brazing filler metal. The tensile strength of the joint first increases and then decreases with the addition of Zn. When the content of Zn is less than 0.20wt%, the tensile fracture type is ductile fracture, more than 0.20wt%, and the tensile fracture type is brittle fracture. The optimal addition amount of Zn is 0.20 wt%.