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      Phase reaction of ceria in LPS–SiC with Al 2O 3–Y 2O 3 and AlN–Y 2O 3 additives : Paper presented at the 2 nd Sino-German Symposium on Computational Thermodynamics and Kinetics and their Applications to Solidification

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          Abstract

          Dense SiC with addition of CeO 2 was obtained by liquid phase sintering using different additives (Y 2O 3, Al 2O 3) and (Y 2O 3, AlN). The total amounts of additives (Al 2O 3 + Y 2O 3) and (AlN + Y 2O 3) were fixed at 10 mass.% and 10 vol.%, respectively. Two different molar ratios of Al 2O 3:Y 2O 3 additives, 1:1 and 5:3, were selected for investigation. Ratios of AlN:Y 2O 3 were selected as 3:2 and 4:1. Influences of both different ratios of Al 2O 3:Y 2O 3 and AlN:Y 2O 3 and amounts of CeO 2 on sintering behaviour were investigated. The phase reaction products were identified by X-ray diffraction and microstructures were investigated using scanning electron microscopy with energy dispersive X-ray spectroscopy techniques. In the samples using Al 2O 3 + Y 2O 3 as sintering additives, the CeO 2 was dissolved in Y 4Al 2O 9 phase during sintering. The oxidation state of Ce 4+ changed to Ce 3+ and Ce 3+ occupies Y 3+ positions, causing increases in lattice parameters for Y 4Al 2O 9 with CeO 2 content. In samples with AlN + Y 2O 3 as sintering additives, Y 10Al 2Si 3O 18 and Y 2Si 3N 4O 3 were formed in the CeO 2-free and CeO 2 containing compositions. During sintering, the CeO 2 dissolves in oxynitrides via a similar mechanism as in the Y 4Al 2O 9 phase.

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          Phase reaction of ceria in LPS–SiC with Al 2 O 3 –Y 2 O 3 and AlN–Y 2 O 3 additives

           Z. Pan,  O. Fabrichnaya (corresponding) ,  G. Schreiber (2010)
          Dense SiC with addition of CeO 2 was obtained by liquid phase sintering using different additives (Y 2 O 3 , Al 2 O 3 ) and (Y 2 O 3 , AlN). The total amounts of additives (Al 2 O 3 + Y 2 O 3 ) and (AlN + Y 2 O 3 ) were fixed at 10 mass.% and 10 vol.%, respectively. Two different molar ratios of Al 2 O 3 :Y 2 O 3 additives, 1:1 and 5:3, were selected for investigation. Ratios of AlN:Y 2 O 3 were selected as 3:2 and 4:1. Influences of both different ratios of Al 2 O 3 :Y 2 O 3 and AlN:Y 2 O 3 and amounts of CeO 2 on sintering behaviour were investigated. The phase reaction products were identified by X-ray diffraction and microstructures were investigated using scanning electron microscopy with energy dispersive X-ray spectroscopy techniques. In the samples using Al 2 O 3 + Y 2 O 3 as sintering additives, the CeO 2 was dissolved in Y 4 Al 2 O 9 phase during sintering. The oxidation state of Ce 4+ changed to Ce 3+ and Ce 3+ occupies Y 3+ positions, causing increases in lattice parameters for Y 4 Al 2 O 9 with CeO 2 content. In samples with AlN + Y 2 O 3 as sintering additives, Y 10 Al 2 Si 3 O 18 and Y 2 Si 3 N 4 O 3 were formed in the CeO 2 -free and CeO 2 containing compositions. During sintering, the CeO 2 dissolves in oxynitrides via a similar mechanism as in the Y 4 Al 2 O 9 phase.
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            Author and article information

            Journal
            ijmr
            International Journal of Materials Research
            Carl Hanser Verlag
            1862-5282
            2195-8556
            2010
            : 101
            : 11
            : 1405-1413
            Affiliations
            a Technical University of Freiberg, Institute of Materials Science, Freiberg, Germany
            b Department of Materials Science and Engineering, University of Florida, Gainesville, USA
            c Department of Nuclear and Radiological Engineering, University of Florida, Gainesville, USA
            Author notes
            [* ] Correspondence address, Dr. Olga Fabrichnaya, T. U. Bergakademie Freiberg, Institut für Werkstoffwissenschaft, Gustav-Zeuner-Straβe 5, D-09599 Freiberg, Germany, Tel.: +49 3731 393156, Fax: +493731 393657, E-mail: fabrich@ 123456ww.tu-freiberg.de
            Article
            MK110424
            10.3139/146.110424
            © 2010, Carl Hanser Verlag, München
            Page count
            References: 33, Pages: 9
            Product
            Categories
            Basic

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