• CN:11-2187/TH
  • ISSN:0577-6686

›› 2012, Vol. 48 ›› Issue (8): 67-73.

• 论文 • 上一篇    下一篇

SnAgCu/SnAgCuCe焊点的显微组织与性能

张亮;韩继光;郭永环;赖忠民; 张亮   

  1. 江苏师范大学机电工程学院;江苏科技大学先进焊接技术省级重点实验室;鲁科斯钎焊材料(苏州)有限公司
  • 发布日期:2012-04-20

Microstructures and Property of SnAgCu/SnAgCuCe Solder Joints

ZHANG Liang;HAN Jiguang; GUO Yonghuan;LAI Zhongmin;ZHANG Liang   

  1. School of Mechanical & Electrical Engineering, Jiangsu Normal University Provincial Key Laboratory of Advanced Welding Technology, Jiangsu University of Science and Technology Lucas Milhaupt Brazing Materials(Suzhou) Co., Ltd.
  • Published:2012-04-20

摘要: 针对SnAgCu和SnAgCuCe两种无铅焊点,研究焊点内部组织、力学性能及热疲劳特性。研究结果表明,稀土元素Ce的加入可以提高焊点的力学性能,稀土元素的添加可以使SnAgCu焊点拉伸力提高近12.7%。稀土元素的添加细化SnAgCu基体组织,同时减小金属间化合物颗粒(Cu6Sn5和Ag3Sn)的尺寸,这是SnAgCuCe焊点力学性能提高的主要原因。拉伸断裂后的扫描电镜分析表明,两种焊点的断裂呈现明显的韧性断裂特征。另外在温度循环载荷下,稀土元素可以显著提高SnAgCu焊点的疲劳寿命。基于有限元模拟发现SnAgCuCe的抗蠕变性能显著高于SnAgCu焊点。

关键词: 力学性能, 韧性断裂, 无铅焊点, 稀土元素

Abstract: For SnAgCu/SnAgCuCe solder joints, the microstructures, mechanical property and thermal fatigue property are investigated respectively. Results indicate that the mechanical properties of SnAgCu solder joints are enhanced with the addition of Ce, and the tensile forces of SnAgCuCe solder joints are 12.7% higher than that of SnAgCu solder joints. With the addition of rare earth Ce, the microstructure of SnAgCu can be refined, and the size of intermetallic compound (IMC) particles (Cu6Sn5 and Ag3Sn) can be reduced, which are the reasons for the mechanical properties enhancement of SnAgCu solder joints. The SEM inspection and analysis show that fracture of the SnAgCu/SnAgCuCe solder joints presents obviously toughness fracture mechanism. In addition, during thermal cyclic loading, it is found that the addition of rare earth Ce can enhance the fatigue life of SnAgCu solder joints. Based on finite element simulation, it is found that SnAgCuCe solder joints shows higher creep resistance than that SnAgCu solder joints.

Key words: Lead-free solder joints, Mechanical property, Rare earths, Toughness fracture

中图分类号: