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Title: Effect of Gold on the Microstructural Evolution and Integrity of a Sintered Silver Joint

There is a need for next-generation, high-performance power electronic packages and systems employing wide band gap devices to operate at high temperatures in automotive and electric grid applications. Sintered silver joints are currently being evaluated as an alternative to Pb-free solder joints. Of particular interest is the development of joints based on silver paste consisting of nanoscale or micron scale particles that can be processed without the application of an external pressure. Microstructural evolution at the interface of a pressureless sintered silver joint formed between a SiC die with a Ti/Ni/Au metallization and an Active Metal Brazed substrate with Ag metallization at 250 °C was evaluated using Scanning Electron Microscopy, X-ray microanalysis, and X-ray Photo Electron Spectroscopy. Results from Focused Ion Beam cross-sections show that during sintering, the pores in the sintered region close to the Au layer tend to be smaller and are oriented predominantly with their longer dimension oriented parallel to the interface. With further densification, this results in the alignment of small pores parallel to the interface, creating a path for easy crack propagation. Lastly, X-ray microchemical analyses results confirm interdiffusion between Au and Ag and that a region with poor mechanical strength is formed at themore » edge of this region of interdiffusion.« less
Authors:
 [1] ;  [1] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Electronic Materials
Additional Journal Information:
Journal Volume: 46; Journal Issue: 7; Journal ID: ISSN 0361-5235
Publisher:
Springer
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Electricity Delivery and Energy Reliability (OE)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; pore connectivity; pore shape; Au–Ag interdiffusion; Sintered Ag
OSTI Identifier:
1366367

Muralidharan, Govindarajan, Leonard, Donovan N., and Meyer, Harry M.. Effect of Gold on the Microstructural Evolution and Integrity of a Sintered Silver Joint. United States: N. p., Web. doi:10.1007/s11664-016-5216-8.
Muralidharan, Govindarajan, Leonard, Donovan N., & Meyer, Harry M.. Effect of Gold on the Microstructural Evolution and Integrity of a Sintered Silver Joint. United States. doi:10.1007/s11664-016-5216-8.
Muralidharan, Govindarajan, Leonard, Donovan N., and Meyer, Harry M.. 2017. "Effect of Gold on the Microstructural Evolution and Integrity of a Sintered Silver Joint". United States. doi:10.1007/s11664-016-5216-8. https://www.osti.gov/servlets/purl/1366367.
@article{osti_1366367,
title = {Effect of Gold on the Microstructural Evolution and Integrity of a Sintered Silver Joint},
author = {Muralidharan, Govindarajan and Leonard, Donovan N. and Meyer, Harry M.},
abstractNote = {There is a need for next-generation, high-performance power electronic packages and systems employing wide band gap devices to operate at high temperatures in automotive and electric grid applications. Sintered silver joints are currently being evaluated as an alternative to Pb-free solder joints. Of particular interest is the development of joints based on silver paste consisting of nanoscale or micron scale particles that can be processed without the application of an external pressure. Microstructural evolution at the interface of a pressureless sintered silver joint formed between a SiC die with a Ti/Ni/Au metallization and an Active Metal Brazed substrate with Ag metallization at 250 °C was evaluated using Scanning Electron Microscopy, X-ray microanalysis, and X-ray Photo Electron Spectroscopy. Results from Focused Ion Beam cross-sections show that during sintering, the pores in the sintered region close to the Au layer tend to be smaller and are oriented predominantly with their longer dimension oriented parallel to the interface. With further densification, this results in the alignment of small pores parallel to the interface, creating a path for easy crack propagation. Lastly, X-ray microchemical analyses results confirm interdiffusion between Au and Ag and that a region with poor mechanical strength is formed at the edge of this region of interdiffusion.},
doi = {10.1007/s11664-016-5216-8},
journal = {Journal of Electronic Materials},
number = 7,
volume = 46,
place = {United States},
year = {2017},
month = {1}
}