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Microstructure Evolution During Spark Plasma Sintering of Metastable (ZrO2-3 mol% Y2O3)-20 wt% Al2O3 Composite Powders

Suffner, Jens and Lattemann, Martina and Hahn, Horst and Giebeler, Lars and Hess, Christian and Cano, Irene Garcia and Dosta, Sergi and Guilemany, Josep Maria and Musa, Clara and Locci, Antonio Mario and Licheri, Roberta and Orrú, Roberto and Cao, Giacomo (2010):
Microstructure Evolution During Spark Plasma Sintering of Metastable (ZrO2-3 mol% Y2O3)-20 wt% Al2O3 Composite Powders.
93, In: Journal of the American Ceramic Society, (9), WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, pp. 2864-2870, ISSN 00027820, [Online-Edition: http://dx.doi.org/10.1111/j.1551-2916.2010.03752.x],
[Article]

Abstract

Metastable ZrO2 (3 mol% Y2O3)–20 wt% Al2O3 oxide composite powders are obtained by liquid nitrogen quenched plasma spraying of commercially available powders. During passage of the plasma, Al2O3, ZrO2, and Y2O3 are molten and rapidly solidified upon impact on the liquid nitrogen cooled substrate. Aluminum cations are nearly completely incorporated into zirconia leading to the stabilization of the cubic zirconia phase. Spark plasma sintering of these powders is successfully performed to obtain a dense composite with grain sizes in the range of 300–500 nm. Phase separation of the immiscible phases accompanied by homogeneous precipitation of Al2O3 occurs during sintering. Because of the short holding times applied during densification, complete phase separation may be suppressed and the metastable character is partially retained. The detected Al2O3 content in ZrO2 is still larger than the equilibrium solubility. Phase evolution during all phases of the process is recorded by means of X-ray diffraction, scanning as well as transmission electron microscopy, and Raman spectroscopy.

Item Type: Article
Erschienen: 2010
Creators: Suffner, Jens and Lattemann, Martina and Hahn, Horst and Giebeler, Lars and Hess, Christian and Cano, Irene Garcia and Dosta, Sergi and Guilemany, Josep Maria and Musa, Clara and Locci, Antonio Mario and Licheri, Roberta and Orrú, Roberto and Cao, Giacomo
Title: Microstructure Evolution During Spark Plasma Sintering of Metastable (ZrO2-3 mol% Y2O3)-20 wt% Al2O3 Composite Powders
Language: English
Abstract:

Metastable ZrO2 (3 mol% Y2O3)–20 wt% Al2O3 oxide composite powders are obtained by liquid nitrogen quenched plasma spraying of commercially available powders. During passage of the plasma, Al2O3, ZrO2, and Y2O3 are molten and rapidly solidified upon impact on the liquid nitrogen cooled substrate. Aluminum cations are nearly completely incorporated into zirconia leading to the stabilization of the cubic zirconia phase. Spark plasma sintering of these powders is successfully performed to obtain a dense composite with grain sizes in the range of 300–500 nm. Phase separation of the immiscible phases accompanied by homogeneous precipitation of Al2O3 occurs during sintering. Because of the short holding times applied during densification, complete phase separation may be suppressed and the metastable character is partially retained. The detected Al2O3 content in ZrO2 is still larger than the equilibrium solubility. Phase evolution during all phases of the process is recorded by means of X-ray diffraction, scanning as well as transmission electron microscopy, and Raman spectroscopy.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 93
Number: 9
Publisher: WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 15 Feb 2013 09:34
Official URL: http://dx.doi.org/10.1111/j.1551-2916.2010.03752.x
Identification Number: doi:10.1111/j.1551-2916.2010.03752.x
Funders: Supported by the EU within the sixth framework program STRP NMP3-CT-2004-001470 (NAMAMET: NAnostructured MAterials through MEtastable Transformations), the MAT2007-65179 project and by the Generalitat de Catalunya with the project 2009-SGR 00390.
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