Abstract <p>Intermetallic compound (IMC) joints formed via transient liquid-phase (TLP) bonding offer excellent high-temperature durability. However, IMC formation at the joint requires long bonding times and high pressures. In this study, to reduce the bonding time and pressure required for IMC formation, a Sn/Ni/Sn laminated metal preform was fabricated by inserting Ni foil between Sn foils, and this material was used to bond a chip to a substrate. The microstructure of the joint cross-section was analyzed using field-emission scanning electron microscopy and energy-dispersive x-ray spectroscopy. The Sn foil was completely converted to 7&#xa0;μm Ni<sub>3</sub>Sn<sub>4</sub> within 15&#xa0;min, forming a stable TLP-bonded joint. After bonding, a shear test was conducted to evaluate the mechanical properties of the joints, which revealed high shear strength, exceeding 46&#xa0;MPa.</p> Graphical Abstract <p></p>

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Transient Liquid-Phase Bonding Using Sn/Ni/Sn Laminated Metal Preform for Power Device Packaging

  • Dong-Bok Lee,
  • Young-Jin Seo,
  • Jeong-Won Yoon

摘要

Abstract

Intermetallic compound (IMC) joints formed via transient liquid-phase (TLP) bonding offer excellent high-temperature durability. However, IMC formation at the joint requires long bonding times and high pressures. In this study, to reduce the bonding time and pressure required for IMC formation, a Sn/Ni/Sn laminated metal preform was fabricated by inserting Ni foil between Sn foils, and this material was used to bond a chip to a substrate. The microstructure of the joint cross-section was analyzed using field-emission scanning electron microscopy and energy-dispersive x-ray spectroscopy. The Sn foil was completely converted to 7 μm Ni3Sn4 within 15 min, forming a stable TLP-bonded joint. After bonding, a shear test was conducted to evaluate the mechanical properties of the joints, which revealed high shear strength, exceeding 46 MPa.

Graphical Abstract