期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 685, 期 -, 页码 680-689出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.05.245
关键词
TiC nanoparticles; Lead-free solder; Wettability; Interfacial IMC; Mechanical properties; Isothermal ageing
资金
- National Nature Science Foundation of China (NSFC)
- Research Grants Council (RGC) Joint Research project (NSFC) [61261160498]
- Research Grants Council (RGC) Joint Research project (RGC) [CityU101/12]
- China-European Union technology cooperation project [1110]
- Marie Curie International Research Staff Exchange Scheme Project within the 7th European Community Framework Programme [PIRSES-GA-2010-269113]
This paper is focused on the effect of TiC nano-reinforcement that was successfully introduced into a SAC305 lead-free solder alloy with different weight fractions (0, 0.05, 0.1 and 0.2 wt%) through a powder-metallurgy route. Actual retained ratios of TiC reinforcement in composite solder billets and solder joints were quantitatively analysed. The obtained SAC/TiC solders were also studied extensively with regard to their coefficient of thermal expansion (CTE), wettability and thermal properties. In addition, evolution of interfacial intermetallic compounds (IMCs) and corresponding changes in mechanical properties under thermal ageing were investigated. Only about 10%-30% of initial TiC nanoparticles added were found retained in the final composite solder joints. With an appropriate addition amount of TiC nanoparticles, the composite solders exhibited an improvement in their wettability. A negligible change in their melting point and a widened melting range were found in composite solders containing TiC reinforcement. Also, the CTE of composite solder alloys was effectively decreased when compared with the plain SAC solder alloy. In addition, a growth of interfacial IMCs in composite solder joints was notably suppressed under isothermal ageing condition, while their corresponding mechanical properties of composite solder joints significantly outperformed those of non-reinforced solder joints throughout the ageing period. (C) 2016 Elsevier B.V. All rights reserved.
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