2026

Nedeljković, Milan 
Mladenović, Srba 
Ćosović, Vladan 
Marković, Ivana 
Petrović, Jasmina 
Stamenković, Uroš 

University of Belgrade - Technical Faculty in Bor

Proceedings [Elektronski izvor] - 32nd International conference Ecological Truth & Environmental Research - EcoTER'26, Sokobanja, Serbia, 24-26 June 2026

485

489

English

M33 - Conference paper at an international conference, printed in full

The increasing demand for environmentally friendly electronic materials has encouraged the development of lead-free solder alloys and sustainable production technologies. Despite numerous alternatives, the eutectic Sn-0.7Cu alloy has been recognized as a promising candidate for lead-free solder applications due to its low cost, acceptable mechanical properties, and compliance with RoHS and WEEE regulations. This study investigates the effect of graphene nanoparticles, in the form of graphene nanosheets (GNS), on the microstructural and mechanical properties of Sn-0.7Cu matrix composites produced via powder metallurgy. GNS was incorporated into the matrix in small weight fractions (0, 0.02, 0.04, 0.06, 0.08, and 0.10 wt.%) to promote microstructural refinement and enhance the mechanical properties of the composites. Optical microscopy was used to characterize the microstructure of the sintered samples, while microhardness was measured using the Vickers method. The results indicate that increasing the graphene content significantly refines the grains, reducing the average grain size by approximately 54 % and increasing the microhardness by about 16 % compared to the base alloy.

lead-free solder, graphene nanoparticles, powder metallurgy, composites

DOI

10.5937/EcoTER26485N

ISBN

978-86-6305-171-3

URI

https://repozitorijum.tfbor.bg.ac.rs/handle/...