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Densification and polymorphic transition of multiphase Y2O3 nanoparticles during spark plasma sintering

Marder, Rachel and Chaim, Rachman and Chevallier, Geoffroy and Estournès, Claude Densification and polymorphic transition of multiphase Y2O3 nanoparticles during spark plasma sintering. (2011) Materials Science and Engineering A, vol.528 (n° 24). pp. 7200-7206. ISSN 0921-5093

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Official URL: http://dx.doi.org/10.1016/j.msea.2011.06.044

Abstract

Multiphase (MP) monoclinic and cubic Y2O3 nanoparticles, 40 nm in diameter, were densified by spark plasma sintering for 5–15 min and100 MPa at 1000 °C, 1100 °C, and 1500 °C. Densification started with pressure increase at room temperature. Densification stagnated during heating compared to the high shrinkage rate in cubic single-phase reference nanopowder. The limited densification of the MP nanopowder originated from the vermicular structure (skeleton) formed during the heating. Interface controlled monoclinic to cubic polymorphic transformation above 980 °C led to the formation of large spherical cubic grains within the vermicular matrix. This resulted in the loss of the nanocrystalline character and low final density.

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 Materials Science and Engineering A website: http://www.sciencedirect.com/science/article/pii/S0921509311007118
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Technion – Israel Institute of Technology (ISRAEL)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
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Deposited By: Denis Faragou

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