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

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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.

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Authors and Affiliations

  1. Department of Physical Chemistry and C.S.T.E./CNR, University of Pavia, V. le Taramelli 16, Pavia, I-27100, Italy

    Filippo Maglia, Chiara Milanese & Umberto Anselmi-Tamburini

  2. Department of Chemistry, Via Vienna 2, Sassari, I-07100, Italy

    Stefania Doppiu & Giorgio Cocco

Authors
  1. Filippo Maglia
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  2. Chiara Milanese
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  3. Umberto Anselmi-Tamburini
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  4. Stefania Doppiu
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  5. Giorgio Cocco
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Correspondence to Umberto Anselmi-Tamburini.

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Maglia, F., Milanese, C., Anselmi-Tamburini, U. et al. Combustion synthesis of mechanically activated powders in the Nb–Si system. Journal of Materials Research 17, 1992–1999 (2002). https://doi.org/10.1557/JMR.2002.0295

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  • DOI: https://doi.org/10.1557/JMR.2002.0295

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