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Ignition mechanism of mechanically activated Me–Si(Me = Ti, Nb, Mo) mixtures

Published online by Cambridge University Press:  03 March 2011

U. Anselmi-Tamburini ,
F. Maglia ,
S. Doppiu ,
M. Monagheddu ,
G. Cocco  and
Z.A. Munir
U. Anselmi-Tamburini*
Affiliation:
Department of Physical Chemistry, University of Pavia, V.le Taramelli 16 -27100 Pavia, Italy, and Department of Chemical Engineering and Materials Science, University of California, Davis, California, 95616
F. Maglia
Affiliation:
Department of Physical Chemistry, University of Pavia, V.le Taramelli 16 -27100 Pavia, Italy
S. Doppiu
Affiliation:
Department of Chemistry, Via Vienna 2 -07100 Sassari, Italy
M. Monagheddu
Affiliation:
Department of Chemistry, Via Vienna 2 -07100 Sassari, Italy
G. Cocco
Affiliation:
Department of Chemistry, Via Vienna 2 -07100 Sassari, Italy
Z.A. Munir
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California, 95616
*
a) Address all correspondence to this author. e-mail: tau@chifis.unipv.it
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Abstract

The influence of mechanical activation on the characteristics and mechanism of ignition of self-propagating high-temperature synthesis processes of different silicides in the systems Me–Si (Me =Ti, Nb, Mo) was investigated. The results show that mechanical activation does not alter the mechanism involved but influences significantly the ignition characteristics. The influence, however, strongly depends on the stoichiometry of the mixtures. The composition Ti:Si = 1:2 shows the largest influence, with the ignition temperatures decreasing from 1400 °C for unmilled powders to about 600 °C for powders milled for several hours. The compositionsTi:Si = 5:3, Nb:Si = 1:2 show less pronounced decreases, while the compositionMo:Si = 1:2 shows no decrease. These differences are discussed in terms of the role of microstructure in the reaction mechanism and the different response of the systems to contamination, particularly from oxygen. The results suggest that for these systems self-ignition processes during milling cannot be explained only on the basis of the decrease in the ignition temperature.

Keywords

Self-propagating high-temperature synthesis (SHS)Mechanical alloyingCombustion synthesis
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 5 , May 2004 , pp. 1558 - 1566
Copyright
Copyright © Materials Research Society 2004

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