Citation

Maglia F, Milanese C, Anselmi-Tamburini U, Doppiu S, Cocco G, Munir ZA. Journal of Alloys and Compounds 2004; 385(1-2): 269-275.

Copyright

(Copyright © 2004)

DOI

10.1016/j.jallcom.2004.03.142

PMID

unavailable

Abstract

The effect of mechanical activation of reactants on the self-propagating high-temperature synthesis of TaSi2 and Ta5Si3 was investigated. SHS experiments were performed on mixtures of compositions Ta:Si = 1:2 and Ta:Si = 5:3 which had been milled for various times. For both compositions, mechanical activation had a large influence on the characteristics of the combustion process, particularly on the combustion peak temperature and wave velocity. The product composition depended on the initial stoichiometry and milling time. For the 5:3 stoichiometry, the product was single phase Ta 5Si3 (in its hexagonal and tetragonal forms) only when the powders were milled for sufficiently long milling times (>120 min). The 1:2 stoichiometry produced TaSi2 in a pure form, regardless of milling conditions. A mechanism for the combustion process is proposed on the basis of the microstructural evolution in quenched reactions. © 2004 Elsevier B.V. All rights reserved.

Language: en

Keywords

Suicides; Tantalum compounds; High temperature effects; Intermetallics; Synthesis (chemical); Microstructure; Silicides; Stoichiometry; Mechanical alloying; Quenching; Composition; Combustion; Combustion synthesis; High-temperature synthesis; Mechanically activated SHS