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Laser sintering mechanism and shear performance of Cu–Ag–Cu joints with mixed bimodal size Ag nanoparticles

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Abstract

In order to obtain Ag nanoparticles (NPs) sintered Cu–Cu joints with better mechanical properties in a relative short time and under a suitable pressure, a laser sintering process and a novel paste prepared by mixed Ag NPs (19 and 62 nm in diameters) were utilized and studied. The results indicated that joints with low porosities were fabricated within 15 s’ laser irradiation. By increasing laser power and sintering time, shear strength of the joints increased obviously. Shear strength of joints with 30% (mass ratio) 62 nm NPs was the highest and could reach 32 MPa when the samples were sintered at 60 W for 15 s under 5 MPa. The enhanced mechanical properties of the joints could be attributed to small NPs that could fill pores between larger NPs and improve initial packing density of the mixed particles. The results indicated that the mixed pastes had excellent potentials as alternative die-attach materials for high temperature power device applications.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 51375003 and 51505104).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China

    Wei Liu, Yiping Wang, Zhen Zheng, Chunqing Wang, Rong An, Yanhong Tian, Lingchao Kong & Ronglin Xu

  2. Key Laboratory of Micro-Systems and Micro-Structures Manufacturing, Ministry of Education, Harbin Institute of Technology, Harbin, 150080, China

    Chunqing Wang & Rong An

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  1. Wei Liu
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  2. Yiping Wang
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  6. Yanhong Tian
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Liu, W., Wang, Y., Zheng, Z. et al. Laser sintering mechanism and shear performance of Cu–Ag–Cu joints with mixed bimodal size Ag nanoparticles. J Mater Sci: Mater Electron 30, 7787–7793 (2019). https://doi.org/10.1007/s10854-019-01094-6

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  • DOI: https://doi.org/10.1007/s10854-019-01094-6

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