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Role of mechanical activation in SHS synthesis of TiC

Maglia, Filippo and Anselmi-Tamburini, Umberto and Deidda, Claudio and Delogu, Francesco and Cocco, Giorgio (2004) Role of mechanical activation in SHS synthesis of TiC. Journal of Materials Science, Vol. 39 (16-17), p. 5227-5230. eISSN 1573-4803. Article.

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DOI: 10.1023/B:JMSC.0000039215.28545.2f

Abstract

The effect of the mechanical activation of the reactants on the self-propagating high-temperature synthesis (SHS) of titanium carbide was investigated. The SHS experiments were performed on two compositions, Tis50C50 and Ti70C30, which define the homogeneity range of the TiC equilibrium carbide. Milling times were progressively increased up to the time at which a combustion-like process ignites spontaneously under milling. The combustion peak temperature, wave velocity, and ignition temperature were markedly influenced by the degree of mechanical activation of the reactants. In particular the ignition temperature was observed to decrease from a temperature corresponding to the melting point of Ti to 500°C. The apparent activation energy for propagation of the combustion wave was also determined (~100 kJ•mol–1) and was found to be independent of both the degree of mechanical activation and the composition of the starting mixture.

Item Type:Article
ID Code:2701
Status:Published
Refereed:Yes
Uncontrolled Keywords:SHS experimetnts, TiC equilibrium carbide, mechanical activation of reactants
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:Springer Netherlands
eISSN:1573-4803
Additional Information:Paper presented at the International Conference on Mechanochemistry and Mechanical Alloying (INCOME 2003), Braunschweig, Germany, 7-11 September 2003.
Deposited On:18 Aug 2009 10:08

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