|Low-pressure micro-silver sintering with the addition of indium for high-temperature power chips attachment
C. ROBERT KAO
|Ag–In intermetallic compounds;Die attachment;Interconnection;Mechanical properties;Micro-Ag sintering;Transient liquid phase bonding;Health hazards;High temperature applications;Indium;Intermetallics;Nickel;Oxidation;Silver;Ag–in intermetallic compound;Die attachment;Interconnection;Intermetallics compounds;Low pressures;Micro-ag sintering;Nano-silver pastes;Silver pastes;Sintered joint;Transient liquid-phase bondings;Sintering
|Journal of Materials Research and Technology
Sintered silver paste is a popular material for die attachment technology in power electronics. However, using traditional nano-silver paste when fabricating sintered joints has intrinsic material problems that cannot be overcome, such as the high cost of nano-silver particles and their potential health hazards. In this study, a novel micro-silver paste was utilized for sintering and bonding to overcome the limitations of nano-silver paste. Although the micro-silver paste is an excellent candidate to replace nano-silver paste for sintering processes to reduce the potential harm to humans, the oxidation at copper substrates on both sides of the pure silver joint at 300 °C causes mechanical reliability issues in long-term high temperature applications. Therefore, a micro-silver paste was sintered with the addition of indium to address the Cu oxidation problem in this study. It was found that Ag–In intermetallic compounds (IMCs) formed through a transient liquid phase reaction. The results demonstrated that sintered joints comprising Ag–In IMCs and Ag–In solid solution phases could effectively resolve the oxidation issues and significantly enhance the high-temperature reliability. Furthermore, the Ag–In IMCs exhibited excellent mechanical properties, withstanding the thermal stress induced during the thermal cycling test. ? 2021 The Author(s)
|Appears in Collections:
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.