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This study investigates the effects of different sintering temperaturesSintering temperature and nano-silver (Ag) particle sizes on the microstructureMicrostructure and shear strength of Ag/nano-Ag pasteNano-Ag paste/Ag joints. Three types of nano-Ag pastes with varying particle sizes were prepared. Results revealed that higher sintering temperaturesSintering temperature improved both densification and shear strength. Specifically, joints made with 70 nm Ag particles exhibited better densification and shear strength compared to those with 20 nm Ag particles, due to the higher packing densityDensity and more effective diffusionDiffusion of the larger particles. However, shear strength of 20 nm, 70 nm, and 20/70 nm Ag joints decreased after testing at 250 °C and after 500 hours of aging at the same temperatureTemperature, although it remained above 30 MPa. This reduction was attributed to atomic diffusionDiffusion at grain boundaries and coarseningCoarsening of the sintered nano-Ag structure. These findings highlight the potential of nano-Ag paste for use in die attachment in electronic power devices.

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Microstructural Evolution and Shear Strength of Nano-Ag Paste Joints with Variable Sintering Temperatures and Particle Sizes

  • 会议论文

  • 发表日期：

    2025年

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  • Changcheng Zheng,
  • Roman Bolzowski,
  • Ming Liu,
  • Dekui Mu,
  • David Yan

摘要

This study investigates the effects of different sintering temperaturesSintering temperature and nano-silver (Ag) particle sizes on the microstructureMicrostructure and shear strength of Ag/nano-Ag pasteNano-Ag paste/Ag joints. Three types of nano-Ag pastes with varying particle sizes were prepared. Results revealed that higher sintering temperaturesSintering temperature improved both densification and shear strength. Specifically, joints made with 70 nm Ag particles exhibited better densification and shear strength compared to those with 20 nm Ag particles, due to the higher packing densityDensity and more effective diffusionDiffusion of the larger particles. However, shear strength of 20 nm, 70 nm, and 20/70 nm Ag joints decreased after testing at 250 °C and after 500 hours of aging at the same temperatureTemperature, although it remained above 30 MPa. This reduction was attributed to atomic diffusionDiffusion at grain boundaries and coarseningCoarsening of the sintered nano-Ag structure. These findings highlight the potential of nano-Ag paste for use in die attachment in electronic power devices.