The Effect of Mechanical Activation of Elemental Powders on Combustion Synthesis of NbAl3

Abstract:

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The effect of mechanical activation procedures on the combustion synthesis of NbAl3 was investigated. The activation was carried out by a two-step high energy ball milling procedure. In the first milling, aluminum and niobium were milled separately (pre-activation). The mixture of pre-activated powders was then activated in the second milling. Reaction synthesis, by simultaneous combustion mode, was conducted on compacted pellets made of powder mixtures with and without pre-activation. The thermal behavior of the compacted pellets upon heating was recorded and the main thermal combustion reaction characteristics were evaluated. The two-step procedure produced aggregates with a globular dispersion of niobium due to increased particle hardness and decreasing mean particle size during pre-activation milling. Analysis of pellet thermal behavior showed the two-step milling procedure could enhance reaction performance by increasing maximum reaction heating rate and temperature gain during reaction.

Info:

Periodical:

Materials Science Forum (Volumes 660-661)

Edited by:

Lucio Salgado and Francisco Ambrozio Filho

Pages:

335-340

DOI:

10.4028/www.scientific.net/MSF.660-661.335

Citation:

C. J. da Rocha and R. M. L. Neto, "The Effect of Mechanical Activation of Elemental Powders on Combustion Synthesis of NbAl3", Materials Science Forum, Vols. 660-661, pp. 335-340, 2010

Online since:

October 2010

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Price:

$35.00

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