摘要：本文研究了In元素对Sn-10Bi钎料的润湿性、力学性能和微观组织的影响。在Sn-10Bi钎料中添加不同含量的In元素，钎料的润湿性会不同。当在Sn-10Bi钎料中添加1wt.%的In时，钎料的润湿性没有明显的变化；当在钎料中添加3wt.%和5wt.%的In元素后，发现钎料的润湿性明显改善，钎料在Cu基板上的铺展面积明显变大，说明添加In元素改善了Sn-10Bi钎料的润湿性。当添加不同含量的In元素在Sn-10Bi钎料中时，发现钎料组织中的Bi相先减少，出现了球形富Sn相，接着富Sn相延伸，Bi相偏析分布在Sn相周围。当添加5wt.%的In元素时，钎料的微观组织中出现了深黑色的物质。通过分析微观组织，发现添加的In元素取代了Bi，而Bi在钎料中起到固溶强化的作用，另外，剪切试验结果表明，在Sn-10Bi钎料中添加不同量的In，钎料的剪切力明显地减小。试验结果说明In元素对钎料的剪切强度有影响。

关键词：Sn-10Bi-In无铅钎料；润湿性；力学性能

Abstract：In this paper, the influence of In element on the wettability, mechanical properties and microstructure of Sn-10Bi solder was studied.In the Sn-10Bi solder to add different content of In elements, solder wetting will be different.When the addition of 1 wt.% Of In in the Sn-10Bi solder, the wettability of the solder did not change significantly. When the 3 wt.% And 5 wt.% Of the In element were added to the solder,the improvement of the wettability and the spreading area of solder on the Cu substrate were obviously increased, indicating that the addition of In element improved the wettability of Sn-10Bi solder.When adding different content of In elements in Sn-10Bi solder, it was found that the Bi phase in the solder was first reduced, the spherical Sn-rich phase appeared, followed by the Sn-rich phase extension, and the Bi-phase segregation was distributed around the Sn phase.When 5wt.% Of the In element is added, dark black material appears in the microstructure of the solder.By analyzing the microstructure, it was found that the added In element replaces Bi and Bi acts as a solid solution in the solder.  In addition, the results of the shear test show that different amounts of In are added to the Sn-10Bi solder.The shearing force of the solder is significantly reduced.The experimental results show that the In element has an effect on the shear strength of the solder.

Keywords:Sn-Bi-In lead-free solder；wettability；mechanical properties

目 录

第一章 绪论 1

1.1引言 1

1.2传统钎料与无铅钎料 1

1.2.1传统钎料的使用及危害 1

1.2.2无铅钎料的提出及研究发展 2

1.3Sn-Bi系钎料的研究 4

1.3.1添加其他元素对Sn-Bi系钎料的影响 4

1.3.2Sn-Bi基钎料的研究方法及现状 10

1.4本论文的研究方法及内容 11

第二章 试验方法及过程 12

2.1试验试样的制备 12

2.1.1熔钎料 12

2.1.2钎料制样 13

2.2试验步骤 13

2.2.1Sn-10Bi-xIn钎料的铺展试验 13

2.2.2Sn-10Bi-xIn钎料的力学性能试验 14

2.2.3Sn-10Bi-xIn钎料的显微组织试验