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Combustion synthesis of mechanically activated powders in the Nb–Si system

Published online by Cambridge University Press:  31 January 2011

Filippo Maglia ,
Chiara Milanese ,
Umberto Anselmi-Tamburini ,
Stefania Doppiu  and
Giorgio Cocco
Filippo Maglia
Affiliation:
Department of Physical Chemistry and C.S.T.E./CNR, University of Pavia, V. le Taramelli 16, I-27100 Pavia, Italy
Chiara Milanese
Affiliation:
Department of Physical Chemistry and C.S.T.E./CNR, University of Pavia, V. le Taramelli 16, I-27100 Pavia, Italy
Umberto Anselmi-Tamburini*
Affiliation:
Department of Physical Chemistry and C.S.T.E./CNR, University of Pavia, V. le Taramelli 16, I-27100 Pavia, Italy
Stefania Doppiu
Affiliation:
Department of Chemistry, Via Vienna 2, I-07100 Sassari, Italy
Giorgio Cocco
Affiliation:
Department of Chemistry, Via Vienna 2, I-07100 Sassari, Italy
*
a)Address all correspondence to this author.tau@chiffs.unipv.it
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Abstract

The effect of the mechanical activation of the reactants on the self-propagating high-temperature synthesis (SHS) of niobium silicides was investigated. SHS experiments were performed on reactant powder blends of composition Nb:Si = 1:2 and Nb:Si = 5:3 pretreated for selected milling times. A self-sustaining reaction could be initiated when a sufficiently long milling time was employed. At short milling times, the reactions self-extinguished or propagated in an unsteady mode. Combustion peak temperature, wave velocity, and product composition were markedly influenced by the length of the milling treatment. Single-phase products could be obtained for sufficiently long milling times. Observation of microstructural evolution in quenched reactions together with isothermal experiments allowed clarification of the mechanism of the combustion process and the role played by the mechanical activation of the reactants.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 8 , August 2002 , pp. 1992 - 1999
Copyright
Copyright © Materials Research Society 2002

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