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Influences of ZrO2 nano-particles on the microstructures and microhardness of Sn8Zn1Bi–xZrO2/Cu solder joints

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Abstract

ZrO2 nano-particles reinforced Sn8Zn1Bi–xZrO2 (x = 0.25, 0.5 and 1) composite solder balls were prepared by a mechanical mixing method and then they were reflowed on Cu substrates. The influences of ZrO2 nano-particles on the microstructures and microhardness of the composite solder joints was investigated. Zn-rich phase was refined in the SnZnBi–xZrO2 composite solder matrices due to the adsorption of the ZrO2 nano-particles on them. The refined Zn-rich phase increased the microhardness of the composite solder matrices. Furthermore, the adsorption effect of ZrO2 nano-particles to the SnZnBi–xZrO2/Cu interface suppressed the growth of intermetallic compound (IMC) layers by decreasing the growth driving force of them. However, Zn atoms were impeded from gathering on the SnZnBi–xZrO2/Cu interfaces to form Cu5Zn8 phase due to the refinement of Zn-rich phase. Therefore, this gave excessive growth of the Cu6Sn5 IMC layer.

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Acknowledgments

This research was financial supported by a Fundamental Research Funds for the Central Universities of P R China (Project No. CDJZR10130010) and a Fundamental Research Funds for the Central Universities (Project No. CDJXS10131155).

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Authors and Affiliations

  1. Chongqing, China

    Changfei Peng, Jun Shen & Henggang Yin

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  1. Changfei Peng
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  2. Jun Shen
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Correspondence to Jun Shen.

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Peng, C., Shen, J. & Yin, H. Influences of ZrO2 nano-particles on the microstructures and microhardness of Sn8Zn1Bi–xZrO2/Cu solder joints. J Mater Sci: Mater Electron 24, 203–210 (2013). https://doi.org/10.1007/s10854-012-0711-z

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