A study on the influence of graphene nano-sheets on the microstructure and mechanical properties of lead-free Sn-0.7Cu solder alloy

Abstract

Numerous research studies on composite solder materials have aimed to develop sustainable lead-free solders. The production of various types of lead-free solders has been seriously investigated worldwide as an alternative to harmful Pb solders. The study examined the influence of graphene nanoparticles on the microstructure, density, and microhardness of lead-free Sn-0.7Cu solder. Graphene was used in the form of graphene nano-sheets (GNSs) with variable weight content and the nano-composite solder was obtained by powder metallurgy method. The purpose of the study was to utilize reinforcement to improve the physical and mechanical properties of solder materials. It was observed that the GNS particles were evenly distributed along the grain boundaries, resulting in a finer dendritic b-Sn structure and higher microhardness values. The addition of GNS particles to the Sn-0.7Cu solder matrix increased the microhardness values by 15%, while the density of the composite solder was slightly reduced.

Keywords

• lead-free solder alloys
• graphene nanosheets
• powder metallurgy