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Densification of nanocrystalline Y2O3 ceramic powder by spark plasma sintering

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, vol. 29 (n° 1). pp. 91-98. ISSN 0955-2219

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Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2008.05.043

Abstract

Nanocrystalline Y2O3 powders with 18 nm 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 5 min 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 150 kJ mol−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
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Thermochimica Acta website : Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of the European Ceramic Society website : http://www.sciencedirect.com/science/journal/00406031
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Technion – Israel Institute of Technology (ISRAEL)
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Celine Cabaup
Deposited On:23 Apr 2009 14:04

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