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- 저자 : Zhenzhen Shan (검색결과 2 건)
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Mitigation and Mechanism of Tin Whisker on Micro-bumps by Hard and Soft Underfills
Zhenzhen Shan,Ke Lin,Anmin Hu,Ming Li 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.6
It is the first time that the mitigation and mechanism of tin whisker on micro-bumps by different types of underfills are investigated under high temperature and humidity (55 ℃/88% RH) storage. Hard epoxy, soft silicone and polyurethane are selected as underfills to spin-coat the 10 μm-diameter and 20 μm-pitch Cu/Ni/SnAg micro-bumps. After six-month storage, underfills exhibite a good mitigation effect despite the surface decomposition, delamination, cracks and voids in varying degrees. Compared with the micro-bumps without underfill, the probability of whisker or hillock and oxidation or corrosion in micro-bumps is reduced by up to 66% and 96%, respectively. Based on the statistics and characterization results, the mitigation mechanism of tin whisker by underfills is proposed. The diameter and critical length of tin whisker are discussed as well to estimate its buckle or penetrate growth. Besides, several underfills failures are summarized. The findings are of great significance to the study of tin whisker mitigation on micro-bumps and provide insights into the reliability of advanced packaging.
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Yi-Yan Lu,Zhenzhen Liu,Shan Li,Xiaobo Zhao 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.3
This paper aimed to investigate the optimum outer diameter of square RC columns strengthened with self-compacting concrete fi lled circular steel tube. An experiment of twelve strengthened RC columns (SRC) and two referential RC columns subjected to axial load was presented. The variables considered in the test were the confi nement index and the diameter of the strengthened section. The experimental results showed that, with the same confi nement index, the material strength utilization of SRC columns dropped with the increasing of strengthened section diameter. There existed an optimum outer diameter to take full use of material strength. With the outer diameter below the optimum value, the material strength utilization increased with increasing confi nement index. As the outer diameter beyond the optimum one, the material strength utilization decreased with improving confi nement index.
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