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Ignition and reaction mechanisms of thermal explosion reaction in the Ni-Ti-C system under air and Ar

Published online by Cambridge University Press:  31 January 2011

Y.F. Yang ,
H.Y. Wang ,
J.G. Wang ,
R.Y. Zhao  and
Q.C. Jiang
Q.C. Jiang*
Affiliation:
Key Laboratory of Automobile Materials of Ministry of Education and Department of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun 130025, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: jqc@jlu.edu.cn
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Abstract

The ignition and reaction mechanisms of the thermal explosion reaction in the Ni-Ti-C system under air and Ar conditions were investigated. The reaction for the formation of TiC can be initiated at a low temperature under air. The ignition temperature under air is much lower than that under Ar. Under Ar, both the ignition and reaction mechanisms consist of dissolution, reaction, and precipitation. Under air, the ignition mechanism is confirmed to be the chemical oven mechanism, and the reaction mechanism is dissolution, reaction, and precipitation. The mechanism of gas transport plays a much more minor role in the ignition and reaction processes under air.

Keywords

CeramicCombustion synthesis (SHS)Differential thermal analysis (DTA)

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Type
Articles
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Journal of Materials Research , Volume 24 , Issue 10 , October 2009 , pp. 3197 - 3205
Copyright
Copyright © Materials Research Society 2009

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