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Densification mechanisms of spark plasma sintering: multi-step pressure dilatometry

  • Sintering 2011
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Abstract

The effects of electrical current and mechanical pressure on the densification of spherical copper powder during spark plasma sintering (SPS) are examined. A novel multi-step pressure dilatometry method is introduced to compare the constitutive behavior of the copper powder under nearly equivalent current-insulated and current-assisted SPS process conditions. The strain rate sensitivity agrees with that predicted for a dislocation climb-controlled creep densification mechanism for both processing setups. Accelerated densification rate leading to a higher final relative density is observed for the current-assisted SPS.

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Notes

  1. Presently, Fuji Electrical Industrial Co., Ltd. Japan.

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Acknowledgements

The support of the US Army ARDEC, Picatinny Arsenal (Contract Award #W15QKN-09C-0128) is gratefully appreciated. The support of the National Science Foundation, Division of Civil, Mechanical, and Manufacturing Innovations (Grant CMMI- 0758232) is gratefully appreciated. The authors are grateful to Dr. Steve Barlow who assisted in SEM work, at the San Diego State University Electron Microscopy Facility acquired by NSF instrumentation grant DBI-0959908. The support of the Department of Science and Education of Russian Federation (Grant Contract 11.G34.31.0051) is also gratefully appreciated.

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Authors and Affiliations

  1. Department of Mechanical Engineering, College of Engineering, San Diego State University, 5500 Campanile Drive, San Diego, CA, 92182, USA

    Wei Li & Eugene A. Olevsky

  2. College of Engineering, San Diego State University, 5500 Campanile Drive, San Diego, CA, 92182, USA

    Randall M. German

  3. Department of Mechanical and Aerospace Engineering, University of California, 9500 Gilman Drive, La Jolla, San Diego, CA, 92093-0411, USA

    Wei Li & Joanna McKittrick

  4. Key Laboratory for Electromagnetic Field Assisted Processing of Novel Materials, Moscow Engineering Physics Institute, 31 Kashirskoe sh., Moscow, Russia, 115409

    Eugene A. Olevsky & Andrey L. Maximenko

Authors
  1. Wei Li
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  2. Eugene A. Olevsky
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  3. Joanna McKittrick
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  4. Andrey L. Maximenko
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  5. Randall M. German
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Correspondence to Wei Li.

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Li, W., Olevsky, E.A., McKittrick, J. et al. Densification mechanisms of spark plasma sintering: multi-step pressure dilatometry. J Mater Sci 47, 7036–7046 (2012). https://doi.org/10.1007/s10853-012-6515-y

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  • DOI: https://doi.org/10.1007/s10853-012-6515-y

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