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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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.
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