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- W2785494021 abstract "Purpose The purpose of this paper is to investigate of the effects of Mn nanoparticle addition on the wettability, microstructure and microhardness of SAC0307- x Mn(np) (SAC: Sn–Ag–Cu; x = 0, 0.02, 0.05, 0.1 and 0.3 Wt.%) composite solders. Design/methodology/approach The SAC0307- x Mn(np) composite solders were prepared by mechanically mixing different weight percentages of Mn nanopowders into the SAC0307 solder paste with rosin flux. In this study, the wettability of the solders was studied using contact angle and spread ratio methods. Afterward, the microstructure of the solders was investigated using scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffractometry. Moreover, the microhardness of the solders was studied. Findings The wetting process of SAC0307- x Mn(np) composite solders was found to experience four stages. Adding a small amount of Mn nanoparticles ( x = 0.05 Wt.%) could improve the wettability compared to Mn-free solder. Beyond this level, the wettability deteriorated. The addition of Mn nanoparticles significantly refined the size and spacing of Ag 3 Sn grains in the solder matrix. When 0.1 Wt.% Mn nanoparticles was added, both the average size of the Ag 3 Sn grains and the spacing between the Ag 3 Sn grains decreased significantly and approached minimum values. Beyond this amount, the size and spacing between Ag 3 Sn grains increased slightly but remained smaller than those in the Mn-free solder matrix. The refined Ag 3 Sn grains increased the microhardness of the Mn-containing composite solders by 6-25 per cent, in good agreement with the prediction of the classic theory of dispersion strengthening. Originality/value The paper demonstrates that Mn nanoparticle addition could improve the SAC0307- x Mn(np) solder wettability and reduce the grain size and spacing between Ag 3 Sn grains. The enhancement of the solder microhardness shows good correlation with the microstructure." @default.
- W2785494021 created "2018-02-23" @default.
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- W2785494021 date "2018-06-04" @default.
- W2785494021 modified "2023-10-18" @default.
- W2785494021 title "Effects of Mn nanoparticle addition on wettability, microstructure and microhardness of low-Ag Sn-0.3Ag-0.7Cu-<i>x</i>Mn(np) composite solders" @default.
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- W2785494021 doi "https://doi.org/10.1108/ssmt-10-2017-0027" @default.
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