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Effect of Carbon Nanotubes on the Shear Strength and Electrical Resistivity of a Lead-Free Solder

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Abstract

In this study, the influence of carbon nanotubes (CNTs) on the shear strength and electrical resistivity of 95.8Sn-3.5Ag-0.7Cu lead-free solder was investigated. Composite solders containing various weight percentages of CNTs were synthesized, and electrical resistivity results of the bulk composite solders revealed that the presence of CNTs did not degrade the electrical performance of such solders. Tests conducted on lap-shear solder joint samples showed an improvement in the shear strength of the composite solders. However, at higher amounts of CNT additions (0.04 wt.% and 0.07 wt.%), the strength improvement was only marginal compared to that of the monolithic solder joint. A comparison of yield stress and ultimate stress test results between the solder joint and bulk solder also showed good agreement. Furthermore, the presence of CNTs in the solder matrix had a minimal influence on the thickness of the interfacial intermetallic compound layer formed during soldering.

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Acknowledgement

The authors gratefully acknowledge the support received from Singapore Institute of Manufacturing Technology under Ref. SIMT/03-420018.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117576, Singapore

    S.M.L. Nai & M. Gupta

  2. Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore, 638075, Singapore

    J. Wei

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  1. S.M.L. Nai
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  2. J. Wei
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  3. M. Gupta
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Correspondence to S.M.L. Nai.

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Nai, S., Wei, J. & Gupta, M. Effect of Carbon Nanotubes on the Shear Strength and Electrical Resistivity of a Lead-Free Solder. J. Electron. Mater. 37, 515–522 (2008). https://doi.org/10.1007/s11664-008-0379-6

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  • DOI: https://doi.org/10.1007/s11664-008-0379-6

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