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A micromechanistic model of the combustion synthesis process: Influence of intrinsic kinetics

Published online by Cambridge University Press:  31 January 2011

Cheng He ,
Chantal Blanchetiere  and
Gregory C. Stangle
Cheng He
Affiliation:
Institute for Aerospace Research, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
Chantal Blanchetiere
Affiliation:
Institute for National Measurement Standards, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada
Gregory C. Stangle
Affiliation:
School of Ceramic Engineering and Sciences, New York State College of Ceramics at Alfred University, Alfred, New York 14802
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Abstract

A micromechanistic model of the combustion synthesis of NbC has been developed by combining the results of an experimental study of the intrinsic, pore-level kinetic mechanism [C. He. and G. C. Stangle, J. Mater. Res. 10, 2829–2841 (1995)] and a theoretical model developed previously [Y. Zhang and G. C. Stangle, J. Mater. Res. 9, 2592–2604 (1994); 9, 2605–2619 (1994)], in order to account for the various physical and chemical processes that take place during the combustion synthesis process. Results of the present investigation are interpreted from both a macroscopic and a microscopic point of view. Moreover, the relationship between the microscopic processes and macroscopic features of the combustion synthesis process is discussed. The results show that the formation of a combustion wave in the Nb-C system corresponded to establishment of a proper balance between the rates of enthalpy redistribution within the sample. Furthermore, the pore size had a significant influence on the combustion synthesis process: smaller pores gave rise to a higher area of contact between the reactants, which in turn gave rise to a higher rate of enthalpy increase due to the enhanced rate of product formation. The influence of the pore size distribution on the process is also discussed.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 8 , August 1998 , pp. 2269 - 2280
Copyright
Copyright © Materials Research Society 1998

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References

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