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Reaction kinetics in the combustion synthesis of Al–Ir–Ni intermetallic compounds

Published online by Cambridge University Press:  31 January 2011

Kai Cai ,
Machiko Ode  and
Hideyuki Murakami
Kai Cai*
Affiliation:
National Institute for Materials Science (NIMS), Tsukuba Science City, Ibaraki 305-0047, Japan
Machiko Ode
Affiliation:
National Institute for Materials Science (NIMS), Tsukuba Science City, Ibaraki 305-0047, Japan
Hideyuki Murakami
Affiliation:
National Institute for Materials Science (NIMS), Tsukuba Science City, Ibaraki 305-0047, Japan
*
a)Address all correspondence to this author. e-mail: cai.kai@nims.go.jp
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Abstract

The combustion synthesis of Al50Ir48Ni2 (at.%) was conducted at different heating rates in both a differential scanning calorimetry (DSC) chamber and a vacuum furnace. It was found that a higher heating rate, a sufficient amount of reactant powder, and effective control of the heat loss facilitated the complete reaction and resulted in combusted single IrAl phase products. Otherwise, multiphase products containing IrAl, unreacted Ir, and Al3Ir were synthesized. The reactions involved in different processes were discussed in terms of the thermal competition between heat generation and loss during the reaction. All ignition temperatures were below 773 K, indicating that the combustion reaction occurs at the solid–solid state. With increasing heating rate, the ignition temperature increased while the product density decreased.

Keywords

Combustion synthesisCompoundKinetics
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 7 , July 2008 , pp. 1953 - 1960
Copyright
Copyright © Materials Research Society 2008

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References

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