Influence of Silicon Nitride (Si3N4) Addition on Microstructure, Mechanical and Thermal Properties of Sn-0.7Cu Lead-Free Solder

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This research has investigated the solder performances of Sn-0.7Cu lead-free solder reinforced with silicon nitride (Si3N4). The Sn-0.7Cu + Si3N4 composite solder were fabricated via powder metallurgy (PM) technique with five different weight percentages (0, 0.25, 0.5, 0.75 and 1.0). Results showed that distribution of Si3N4 along the grain boundaries has increased the hardness of the Sn-0.7Cu + Si3N4 composite solders compared to monolithic Sn-0.7Cu solder alloy. Addition of Si3N4 reinforcement had no significant effect to the melting temperature of the solder. Overall, the entire range of Sn-0.7Cu + Si3N4 composition greatly improves the microhardness of the eutectic solder.

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530-534

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April 2015

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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