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A new synthesis of β'-SiAION using the vapor phase technique reduction of kaolin

Published online by Cambridge University Press:  03 March 2011

A. Seron
Affiliation:
CRMD, UMR CNRS-Université, 1b Rue de la Férollerie, 45071 Orléans Cedex 02, France
F. Béguin
Affiliation:
CRMD, UMR CNRS-Université, 1b Rue de la Férollerie, 45071 Orléans Cedex 02, France
J. Thébault
Affiliation:
SEP, les cinq chemins, le Haillan, BP 37, 33165 St Médard en Jalles, France
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Abstract

Silicon-aluminum oxynitrides and/or aluminum nitride were prepared by the reduction-nitridation of kaolin in graphite crucibles under hydrogen/nitrogen flow at temperatures in the range 1100 °C–1450 °C. Almost pure β'-SiAION was obtained in less than 24 h at 1200 °C. At high temperatures (e.g., 1450 °C) and for long reaction times (e.g., 10 h), β'-SiAION is fully reduced to AlN. In most preparations, β'-SiAION is formed together with small amounts of AlN. However, the formation of AlN can be limited by using short reaction times and/or by adjusting the reducing power of the atmosphere, i.e., the N2/H2 ratio. Compared to the carboreduction of aluminosilicates which always yields mixtures, the present method leads to almost pure products under appropriate conditions. The temperature for the formation of β'-SiAION is at least 200 to 400 °C lower than the temperatures used for the carboreduction of aluminosilicates or sintering of powders, respectively. A gaseous species formed by the reaction of hydrogen with graphite is suspected to be responsible for the nitriding reduction of kaolinite.

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Articles
Copyright
Copyright © Materials Research Society 1994

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