期刊
MATERIALS TODAY COMMUNICATIONS
卷 31, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mtcomm.2022.103356
关键词
Sn-Zn; Core-shell particles; Lead-free solder; Intermetallic compounds (IMCs); Die attach
资金
- Natural Science Foundation of Guangdong Province [2019A1515011844]
- Opening Project of Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory [ZHD201801, 31512050201]
A novel Sn-Zn solder paste based on Zn@Sn core-shell structure was developed to improve the oxidation resistance of Zn particles and enhance the strength of solder joints.
With the advancement of lead-free solder, Sn-Zn solder was once considered the best choice. However, the high activity of Zn limited its application. To solve the problems of serious oxidation of zinc in Sn-Zn solder, a novel Sn-Zn solder paste based on Zn@Sn core-shell structure was developed. The Zn particles with a diameter of 3.5 mu m are coated with a Sn layer with a thickness of 1.5 mu m, which improves the oxidation resistance of Zn particles. The effect of the weight ratio of Zn@Sn to the Sn particles on the type and thickness of the intermetallic compounds (IMCs) layer was investigated. The shear strengths of solder joints based on the Zn@Sn core-shell particles were increased by 44% compared with that of the commercial Sn-Zn preforms, after reflowing at 230 degrees C for 10 min. The fracture microstructure showed a mixed fracture mode with both ductile and brittle characteristics. The results demonstrate that composite solder paste based on Zn@Sn core-shell structure is a promising die attach material for power device packaging.
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