Ultrasonic soldering of Cu alloy using Ni-foam/Sn composite interlayer

焊接 材料科学 金属间化合物 复合材料 微观结构 复合数 冶金 合金 抗剪强度(土壤) 图层(电子) 环境科学 土壤科学 土壤水分
作者
Yong Xiao,Qiwei Wang,Ling Wang,Xian Zeng,Mingyu Li,Ziqi Wang,Xingyi Zhang,Xiaomeng Zhu
出处
期刊:Ultrasonics Sonochemistry [Elsevier BV]
卷期号:45: 223-230 被引量:34
标识
DOI:10.1016/j.ultsonch.2018.03.005
摘要

In this study, Cu alloy joints were fabricated with a Ni-foam reinforced Sn-based composite solder with the assistance of ultrasonic vibration. Effects of ultrasonic soldering time on the microstructure and mechanical properties of Cu/Ni-Sn/Cu joints were investigated. Results showed that exceptional metallurgic bonding could be acquired with the assistance of ultrasonic vibration using a self-developed Ni-foam/Sn composite solder. For joint soldered for 5 s, a (Cu,Ni)6Sn5 intermetallic compound (IMC) layer was formed on the Cu substrate surface, Ni skeletons distributed randomly in the soldering seam and a serrated (Ni,Cu)3Sn4 IMC layer was formed on the Ni skeleton surface. Increasing the soldering time to 20 s, the (Ni,Cu)3Sn4 IMC layer grew significantly and exhibited a loose porous structure on the Ni skeleton surface. Further increase the soldering time to 30 s, Ni skeletons were largely dissolved in the Sn base solder, and micro-sized (Ni,Cu)3Sn4 particles were formed and dispersed homogeneously in the soldering seam. The formation of (Ni,Cu)3Sn4 particles was mainly ascribed to acoustic cavitations induced erosion and grain refining effects. The joint soldered for 30 s exhibited the highest shear strength of 64.9 ± 3.3 MPa, and the shearing failure mainly occurred at the soldering seam/Cu substrate interface.
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