Interfacial microstructure evolution and shear strength of MWCNTs-reinforced Sn-1.0Ag-0.5Cu (SAC105) composite solder interconnects on plain Cu and ENIAg surface finish

Dele-Afolabi, T. T. and M. A., Azmah Hanim and K., Vidyatharran and K. A., Matori and O., Saliza Azlina and R., Calin (2022) Interfacial microstructure evolution and shear strength of MWCNTs-reinforced Sn-1.0Ag-0.5Cu (SAC105) composite solder interconnects on plain Cu and ENIAg surface finish. Journal of Materials Science: Materials in Electronics volume, 33. ISSN 8233–8246

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Official URL: https://doi.org/10.1007/s10854-022-07974-8

Abstract

The combined effect of MWCNTs (multi-walled carbon nanotubes) and ENIAg (Electroless Nickel Immersion Silver) surface finish on the formation of interfacial microstructure and shear strength of the Sn-1.0Ag-0.5Cu (SAC105) solder was investigated in this study. Plain and composite solders (SAC-xCNT; x = 0, 0.01, 0.05 and 0.1wt%) were successfully synthesized through the powdermetallurgy route and afterwards soldered on the ENIAg surface finish and plain Cu substrates. Detailed analysis of the microstructure revealed the formation of the Cu6Sn5 IMC at the SAC solder/Cu substrate interface of the SAC-xCNT/Cu solder interconnects. Whereas, the Ni3Sn4 IMC and (Cu,Ni)6Sn5 IMC appeared at the SAC solder/ENIAg substrate interface of the SAC-xCNT/ENIAg. The MWCNTs-reinforced SAC composite solder interconnects exhibited thinner interfacial IMC layer thicknesses relative to the plain counterparts for both substrates used. Given the prospects of the ENIAg as a reliable surface finishmaterial, the SAC-xCNT/ENIAg exhibited IMC thickness valueswithin the range of 2.98–2.65 lm as compared to the 5.23–3.61 lm demonstrated by the SAC�xCNT/Cu. Overall, the strengthening capacity of the MWCNTs was well-defined in both sample grades, with the SAC-0.05CNT/Cu and SAC-0.05CNT/ENIAg exhibit�ing the highest shear strength values of 10.23 MPa and 11.14 MPa, respectively.

Item Type:	Article
Subjects:	T Technology > T Technology (General)
Depositing User:	Mr. Abdul Rahim Mat Radzuan
Date Deposited:	31 May 2022 07:20
Last Modified:	31 May 2022 07:20
URI:	http://eprints.uthm.edu.my/id/eprint/7099

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