RETRACTED: Strengthening effects of ZrO2 nanoparticles on the microstructure and microhardness of Sn–3.5Ag lead-free solder

✍ Scribed by J. Shen; Y.C. Liu; Y.J. Han; Y.M. Tian; H.X. Gao

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 873 KB
• Volume: 441
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.08.006

✦ Synopsis

A ZrO 2 nanoparticles strengthened lead-free Sn-3.5Ag-ZrO 2 solder was prepared by mechanically stirring ZrO 2 nanoparticles into the molten melt of eutectic Sn-3.5Ag alloy. The influence of ZrO 2 nanoparticles on the eutectic solidification process, in particular the formation of Ag 3 Sn intermetallic compounds (IMCs) and thus the formed microstructures and their microhardness of Sn-3.5Ag solder were systematically investigated. The addition of ZrO 2 nanoparticles significantly refined the size of Ag 3 Sn IMCs due to the strong adsorption effect of the ZrO 2 nanoparticles. The refined Ag 3 Sn IMCs increases the Vicker's microhardness of the prepared Sn-3.5Ag-ZrO 2 solder, which corresponds well with the prediction of classic theory of dispersion strengthening.