Abstract
This study investigates the effect of minor additions of Ni, Ni3Sn or Ni3Sn2 nanoparticles on the microstructure and mechanical properties of Cu/solder/Cu joints. The nanocomposite Sn-3.0Ag-0.5Cu (SAC305) solders with 0.5, 1.0 and 2.0 wt.% metallic nanoparticles were prepared through a paste mixing method. The employed Ni and Ni-Sn nanoparticles were produced via a chemical reduction method. The microstructure of as-solidified Cu/solder/Cu joints was studied by x-ray diffraction and scanning electron microscopy. The results showed that additions of Ni and Ni-Sn nanoparticles to the SAC305 solder paste lead initially to a decrease in the average thickness of the intermetallic compound layer in the interface between solder and substrate, while further additions up to 2.0 wt.% did not induce any significant changes. In addition, shear strength and microhardness tests were performed to investigate the relationship between microstructure and mechanical properties of the investigated solder joints. The results indicated an increase in both of these properties which was most significant for the solder joints using SAC305 with 0.5 wt.% Ni or Ni-Sn nanoparticles.
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Open access funding provided by Austrian Science Fund (FWF). Financial support for this study came from the Austrian Science Fund (FWF) under Project Nos. P 26304 and P 27049, and the Slovak Scientific Grant Agency under Project Nos. VEGA 2/0172/16 and VEGA 2/0189/14.
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Yakymovych, A., Švec, P., Orovcik, L. et al. Nanocomposite SAC Solders: The Effect of Adding Ni and Ni-Sn Nanoparticles on Morphology and Mechanical Properties of Sn-3.0Ag-0.5Cu Solders. J. Electron. Mater. 47, 117–123 (2018). https://doi.org/10.1007/s11664-017-5834-9
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DOI: https://doi.org/10.1007/s11664-017-5834-9