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Mechanistic and processing studies in combustion synthesis of niobium aluminides

Published online by Cambridge University Press:  03 March 2011

C.R. Kachelmyer
Affiliation:
Department of Chemical Engineering, University of Notre Dame, Notre Dame, Indiana 46556-5637
A.S. Rogachev*
Affiliation:
Department of Chemical Engineering, University of Notre Dame, Notre Dame, Indiana 46556-5637
A. Varma*
Affiliation:
Department of Chemical Engineering, University of Notre Dame, Notre Dame, Indiana 46556-5637
*
a)Permanent address: Institute of Structural Macrokinetics, Russian Academy of Sciences, Chemogolovka, 142 432, Russia.
b)Author to whom correspondence should be addressed.
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Abstract

Combustion synthesis of NbAl3 and Nb2Al was studied using the volume combustion mode. The effects of heating rate and green density were examined for NbAl3 synthesis. The effect of green density was also investigated for Nb2Al. Greater reaction completion was achieved at higher heating rates and green densities. In both NbAl3 and Nb2Al samples, the reaction was initiated above the melting point of Al. Quenching (Nb+3Al) samples pressed at relatively high and low densities below the ignition temperature, and results of a particle-foil experiment, identified the spreading characteristic of molten Al over Nb, providing mechanistic details about niobium aluminide product formation.

Type
Articles
Copyright
Copyright © Materials Research Society 1995

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