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Changes in the Ta50C50 mechanochemical reactivity under different milling conditions

Deidda, Claudio and Delogu, Francesco and Cocco, Giorgio (2004) Changes in the Ta50C50 mechanochemical reactivity under different milling conditions. Journal of Metastable and Nanocrystalline Materials, Vol. 20-21 , p. 337-342. ISSN 1422-6375. Article.

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DOI: 10.4028/www.scientific.net/JMNM.20-21.337

Abstract

The reactivity of Ta-C mixtures with a composition of Ta:C=50:50 was investigated under different mechanical processing conditions. The specific milling intensity was changed by varying the average impact energy and the collision frequency. These quantities were proven to be the key parameters for a quantitative description of the chemical reaction. The gradual formation of the non-stoichiometric carbide phase TaC was observed either at very low or at very high impact energies. At intermediate values, the mechanical processing induced the spontaneous spreading out of the reaction. Ignition times were found to depend on the impact energy and the shortest activation period was registered for the highest impact energy. Results prove that the mechanical work required for the combustion is independent of the milling intensity and is a characteristic quantity of the system.

Item Type:Article
ID Code:2690
Status:Published
Refereed:Yes
Uncontrolled Keywords:Kinetic, mechanically-induced self-propagating reaction MSR, mechanochemical activation, self-sustaining high-temperature synthesis SHS, structural refinement
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:Trans Tech Publications
ISSN:1422-6375
Additional Information:Paper presented at: Metastable, mechanically alloyed and nanocrystalline materials: 10th International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials (ISMANAM), Foz do Iguaçu, Brazil, August 24-28, 2003.
Deposited On:18 Aug 2009 10:08

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