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Reaction mechanism in combustion synthesis of α-Si3N4 powder using NaN3

Published online by Cambridge University Press:  31 January 2011

Shyan-Lung Chung ,
Chih-Wei Chang  and
F.J. Cadete Santos Aires
Shyan-Lung Chung*
Affiliation:
Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan, Republic of China
Chih-Wei Chang
Affiliation:
Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan, Republic of China
F.J. Cadete Santos Aires
Affiliation:
Institut de Recherches sur la Catalyse, National Center for Scientific Research, Villeurbanne Cedex 69626, France
*
a)Address all correspondence to this author. e-mail: slchung@mail.ncku.edu.tw
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Abstract

A combustion synthesis method for the synthesis of α-Si3N4 from a reactant compact composed of Si, NaN3, and NH4X and wrapped up with an igniting agent was investigated. Wrapping the reactant compact with the igniting agent (i.e., a mixture of Ti and C powders) was found necessary for the synthesis of Si3N4. In addition to NH4Cl, which was considered previously to function as a catalytic agent, other ammonium halides (i.e., NH4F, NH4Br, and NH4I) were found to be capable of catalyzing the synthesis reaction with NH4Cl being the most effective. Si3N4 could not be produced when NaN3 was replaced by C3H6N6. NaN3 was thus considered to exert an essential effect on the combustion synthesis reaction other than functioning as a solid-state nitrogen source as considered previously. It was proposed that Na vapor produced by decomposition of NaN3 reduces SiXx (formed by reaction of Si and NH4X), promoting the nitridation reaction to form Si3N4. NaN3 thus plays a role as a reducing agent in the synthesis reaction.

Keywords

Combustion synthesis (SHS)Nitride
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 10 , October 2008 , pp. 2720 - 2726
Copyright
Copyright © Materials Research Society 2008

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References

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