Interfacial Bonding Mechanism Using Silver Metallo-Organic Nanoparticles to Bulk Metals and Observation of Sintering Behavior

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Abstract

We have proposed a novel bonding process using silver nanoparticles, which can be alternative to lead-rich high melting point solders. The bonding mechanism of silver metallo-organic nanoparticles to bulk materials (gold and copper) is discussed based on the observations of the bonded interface using Transmission Electron Microscope (TEM). At the interface of sintered silver and bulk gold, the crystal orientation of silver corresponded to that of gold. It is thought that the epitaxial layer of silver formed through silver nanoparticles being oriented in the direction of the gold crystal. At the interface of sintered silver and bulk copper, no epitaxial layer of silver on the copper crystal formed. Though the appearance of the crystal structure of silver/copper interface is different from that of the silver/gold interface, copper as well as gold are coherent with silver, and have been successfully bonded using the silver nanoparticles.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 49 (7), 1537-1545, 2008

    The Japan Institute of Metals and Materials

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