Journal
INTERMETALLICS
Volume 150, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2022.107683
Keywords
Lead-free composite solder; EutecticSn-Ag-Cu alloy; Ni-decorated reduced graphene oxide; Microstructure; Mechanical property
Categories
Funding
- State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology [22M21]
- National Natural Science Foundation of China (NSFC) [52101212, 52175288]
- Scientific and Technological Research Program of Chongqing Municipal Education Commission [KJQN202001527]
- Chongqing Postdoctoral Science Foundation [cstc2020jcyj-bshX0087]
- Program for Creative Research Groupsin University of Chongqing
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Introducing Ni-RGO nanosheets as foreign reinforcements in solder joints can improve the soldering reliability. The addition of Ni-RGO can refine the grain size and decrease the thickness of interfacial intermetallic compounds. The solder joint's tensile strength reached its highest value when the Ni-RGO content was 0.03 wt%. However, cracks occurred when the Ni-RGO content exceeded 0.05 wt%.
Introducing foreign reinforcements into solder joints has been demonstrated to be beneficial to promoting the soldering reliability. In this work, Ni-decorated reduced graphene oxide (Ni-RGO) nanosheets as foreign re-inforcements were prepared through the in-situ thermal decomposition of Ni-glycolate@RGO complexes. xNi-RGO/SAC305 composite solders (x = 0, 0.01, 0.03, 0.05, 0.07, 0.1 wt%) were fabricated by the powder met-allurgy method. The results showed that Ni nanoparticles were finely and evenly anchored on both sides of RGO nanosheets. The grain size in xNi-RGO/SAC305 composite solders was significantly refined, while the thickness of the interfacial intermetallic compounds (IMCs) decreased with increasing of Ni-RGO content. The average tensile strength of Cu/(Ni-RGO/SAC305)/Cu solder joints reached 43.0 MPa (18.1% higher than that of the plain SAC305 solder joints) when the amount of Ni-RGO addition reached 0.03 wt%, in which the crack initiation formed occurred in the soldering seam zone. The crack initiated in the micropores between the copper parent metal and composite solder when the content of Ni-RGO nanosheets was above 0.05 wt%, which may due to the agglomerating of submicron-sized Ni-RGO at the interface. These results suggest that traces of Ni-RGO nano -sheets (0.03 wt%) can efficiently improve the interfacial bonding strength and solderability of the Cu/(Ni-RGO/ SAC305)/Cu solder joint.
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