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Predictive Kinetics-based Model for Shock-activated Reaction Synthesis of Ti3SiC2

Published online by Cambridge University Press:  01 June 2005

Jennifer L. Jordan ,
John A. Pelesko  and
Naresh N. Thadhani
Jennifer L. Jordan
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245
John A. Pelesko
Affiliation:
Department of Mathematical Sciences, University of Delaware, Newark, Delaware 19716-2553
Naresh N. Thadhani*
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245
*
b) Address all correspondence to this author. e-mail: naresh.thadhani@mse.gatech.edu
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Abstract

A kinetics model based on mass and heat transport has been developed for Ti3SiC2 formation via shock-activated reaction synthesis of powder precursors. The model allows prediction of heat treatment conditions under which an otherwise steady-state reaction is taken over by a “run-away” combustion-type reaction during post-shock reaction synthesis of Ti3SiC2. Shock compression of Ti, SiC, and graphite precursors generates a densely packed highly activated state of reactants, which lowers the activation energy and results in an increased rate of formation of Ti3SiC2 at a lower temperature and in shorter times. The predictive model correlated with experimental results of fraction reacted as a function of time at heat-treatment temperatures of 1400 and 1600 °C illustrates an increased rate of reaction due to lowering activation energy, which also results in the reaction at 1600 °C being taken over by a “run-away” combustion-type reaction, as the rate of heat release due to reaction exceeds the rate of heat dissipation through the compact. Correlation of the model with experimental results illustrates that the predictive model can be used to optimize reaction synthesis conditions in shock-densified compacts of Ti3SiC2-forming powder precursors, to better understand the processes leading to a steady-state reaction being taken over by the combustion mode.

Keywords

Combustion synthesisSelf-propagating high-temperature synthesis (SHS)Shock loading
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 6 , June 2005 , pp. 1476 - 1484
Copyright
Copyright © Materials Research Society 2005

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References

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