Nanocomposites and nanomaterials

Nanocomposite SAC solder joints: the effect of heat treatment on the morphology and mechanical properties of Sn-3.0Ag-0.5Cu solder joints reinforced with Ni and Ni-Sn nanoparticles
Yakymovych A.1, Plevachuk Yu.2, Orovcik L.3, Švec P. Sr.4
1 Independent Researcher, Dr. Oswin-Moro-Straße 19, 9500 Villach, Austria.
E-mail: yakymovychandriy@gmail.com
2 Department of Metal Physics, Ivan Franko National University of Lviv, Lviv, Kyrylo i Mephodiy Str. 8, 79005 Lviv, Ukraine.
E-mail: plevachuk@mail.lviv.ua
3 Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Dubravska Cesta 9, 84511 Bratislava, Slovakia.

4 Department of Metal Physics, Institute of Physics, Slovak Academy of Sciences, Dubravska Cesta 9, 84511 Bratislava, Slovakia.

This study has investigated the microstructure and shear strength of the nanocomposite Sn-3.0Ag-0.5Cu (SAC305) solder joints with minor additions of Ni and Ni-Sn nanoparticles (NPs). The growth of the interfacial intermetallic compound layer between the nanocomposite solder and Cu substrate was accelerated by isothermal aging. 
The as-synthesized Ni, Ni3Sn and Ni3Sn2 NPs were added to the commercial SAC305 solder paste at a nominal percentage between 0.5 and 2.0 wt.%. The solder joints were produced by laying down the nanocomposite SAC305 solder between two Cu disks. 
The formation and growth of the Cu6Sn5/Cu3Sn IMCs at the interface of the solder joints were evaluated after thermal aging at 300°C and 350°C for up to 480 hours. The shear strength measurements of the aged solder joints were performed by the push-off method. The obtained results were compared with our previous published study of the as-prepared nanocomposite SAC305 solder joints with additions Ni-Sn NPs [1].

1.	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.-2018.-47, P. 117–123. https://doi.org/10.1007/s11664-017-5834-9