Microstructure Evolution of Cu/Sn-58Bi/Cu Solder Joints with Small Gap during Thermomigration

Wei Jingmin; Wei Guoqiang; Kang Yunqing; Liu Lei

doi:10.15980/j.tzzz.2019.11.031

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Microstructure Evolution of Cu/Sn-58Bi/Cu Solder Joints with Small Gap during Thermomigration
Vol. 39, Issue 11, Pages: 1273-1276(2019)
Published： 2019 ，
DOI： 10.15980/j.tzzz.2019.11.031

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[1]韦静敏,卫国强,康云庆,刘磊.热迁移作用时小间隙Cu/Sn-58Bi/Cu焊点显微组织演变[J].特种铸造及有色合金,2019,39(11):1273-1276.

Wei Jingmin, Wei Guoqiang, Kang Yunqing, et al. Microstructure Evolution of Cu/Sn-58Bi/Cu Solder Joints with Small Gap during Thermomigration. [J]. Special Casting & Nonferrous Alloys 39(11):1273-1276(2019)
[1]韦静敏,卫国强,康云庆,刘磊.热迁移作用时小间隙Cu/Sn-58Bi/Cu焊点显微组织演变[J].特种铸造及有色合金,2019,39(11):1273-1276. DOI： 10.15980/j.tzzz.2019.11.031.

Wei Jingmin, Wei Guoqiang, Kang Yunqing, et al. Microstructure Evolution of Cu/Sn-58Bi/Cu Solder Joints with Small Gap during Thermomigration. [J]. Special Casting & Nonferrous Alloys 39(11):1273-1276(2019) DOI： 10.15980/j.tzzz.2019.11.031.

摘要

研究了高度为10μm的Cu/Sn-58Bi/Cu微焊点在加载2 000℃/cm温度梯度以及125℃时效不同时间后的显微组织。结果表明

随着热迁移时间延长

Bi先粗化

然后向冷端偏聚

800h时焊点冷端形成几乎连续的Bi层

同时焊点界面金属间化合物（IMCs）呈对称生长

并且生长速率较慢。在时效条件下

焊点两端的界面IMCs向焊点中心快速生长

逐渐在焊点中心形成均匀且连续的Bi带

200h时Sn被消耗完毕。随着时效时间进一步延长

IMCs中Cu

逐渐转变为Cu

Sn。此外

热迁移条件下

焊点中的Bi可以抑制界面IMCs的不对称生长

并且降低界面IMCs的生长速率

这表明在钎料合金中加Bi可提高微焊点的服役可靠性。

Abstract

The microstructure evolution of the Cu/Sn-58Bi/Cu solder joints with 10μm bump heiGHTunder a temperature gradient of 2 000℃/cm and aging at 125 ℃for different time were investigated

respectively.The results reveal that Bi phase is firstly coarsened and then segregated to the cold end with TM time increase

and then formed a nearly continuous Bi layer at the cold end after TM 800 h.Meanwhile

the intermetallic compounds（IMCs）are grown nearly symmetrically and slowly at the solder joint interface.However

during aging process

the interfacial IMCs are grown rapidly toward the center of the solder joint

resulting in a uniform and continuous Bi layer generation.After Sn phase is consumed completely at aging for 200 h

the Cu

Sn-5 in IMCs is gradually transformed to Cu

Sn.By comparing the above experimental results

it is found that Bi phase in the solder joint can inhibit asymmetric growth and reduce the growth rate of the interfacial IMCs under TM condition

which reveal that the Bi addition in the solder alloy can improve the service reliability of micro solder joint.

关键词

热迁移效应Sn-58Bi钎料微焊点IMCs

Keywords

Thermomigration EffectSn-58Bi SolderMicro-solder JointIMCS

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Electromigration Behavior of Cu/Sn-58Bi/Cu Solder Joints