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Investigation of propagation modes and temperature/velocity variation on unstable combustion synthesis

Published online by Cambridge University Press:  31 January 2011

H. P. Li
H. P. Li
Affiliation:
Jin-Wen Institute of Technology, Hsintien, Taipei County, Taiwan, Republic of China
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Abstract

Combustion synthesis/micropyretic synthesis is a technique in which material synthesis is accomplished by the propagation of a combustion front across the sample. In some cases, the combustion front may propagate in an unstable mode where the propagation velocity and combustion temperature of the combustion front are altered periodically. In this study, the processing conditions leading to unstable combustion reaction were first studied theoretically. The boundary temperatures separating stable and unstable reactions were then determined. The numerical analysis showed that the combustion temperature and the propagation velocity changed periodically during unstable combustion. As the combustion reaction became unstable, the average propagation velocity and the oscillatory frequency of front propagation decreased. The products of unstable combustion synthesis possessed the banded structures, implying the occurrence of the unstable oscillatory propagation, as demonstrated experimentally. In this study, high activation energy combustion (Ti + 2B reaction) and low activation energy combustion (Ni + Al reaction) were both chosen to illustrate the effect of unstable combustion. It is the first time the experimental and numerical results were combined to investigate the temperature and propagation velocity variations during unstable combustion.

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Articles
Information
Journal of Materials Research , Volume 17 , Issue 12 , December 2002 , pp. 3213 - 3221
Copyright
Copyright © Materials Research Society 2002

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