Chaim, Rachman and Shlayer, Amit and Estournès, Claude
Densification of nanocrystalline Y2O3 ceramic powder by spark plasma sintering.
(2009)
Journal of the European Ceramic Society, 29 (1). 91-98. ISSN 0955-2219
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(Document in English)
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Official URL: https://doi.org/10.1016/j.jeurceramsoc.2008.05.043
Abstract
Nanocrystalline Y2O3 powders with 18nm crystallite size were sintered using spark plasma sintering (SPS) at different conditions between 1100 and 1600°C. Dense specimens were fabricated at 100MPa and 1400°C for 5min duration. A maximum in density was observed at 1400°C. The grain size continuously increased with the SPS temperature into the micrometer size range. The maximum in density arises from competition between densification and grain growth. Retarded densification above 1400°C is associated with enhanced grain growth that resulted in residual pores within the grains. Analysis of the grain growth kinetics resulted in activation energy of 150kJmol−1 and associated diffusion coefficients higher by 103 than expected for Y3+ grain boundary diffusion. The enhanced diffusion may be explained by combined surface diffusion and particle coarsening during the heating up with grain boundary diffusion at the SPS temperature.
Item Type: | Article |
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HAL Id: | hal-03572304 |
Audience (journal): | International peer-reviewed journal |
Uncontrolled Keywords: | |
Institution: | Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE) Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE) Other partners > Technion – Israel Institute of Technology (ISRAEL) French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE) |
Laboratory name: | |
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Deposited On: | 23 Apr 2009 14:04 |
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