Mechanical Activation Effect on Self-Sustaining Combustion Reaction in Mo-Si System
Ch. GRAS1,2, D. VREL3, E. GAFFET1 and F. BERNARD2
1"Nanomaterials : far from equilibrium phase transition" group UMR 5060 CNRS - UTBM F-90010,
Belfort (France) E-mail: Gaffet@utbm.fr
2"Fine Grained Materials" group LRRS UMR 5613 CNRS-University of Burgundy BP 400 F-21011 Dijon (France)
E-mail: fbernard@u-bourgogne.fr
3LIMHP CNRS Av. J. B. Clement F-93430 Villetaneuse (France)
E-mail: vrel@limph.univ-paris13.fr
Pages: 173-184
Abstract
Nanostructured molybdenum disilicide (MoSi2) compound was synthesized using an alternative route called MASHS (Mechanically Activated Self-propagating High-temperature Synthesis). This original process combines a short-duration ball milling with a self-sustaining combustion. These two steps were investigated in this paper. The microstructure evolution of powder mixture during mechanical activation was monitored using XRD profiles analysis and TEM investigations. Short-duration ball milling of (Mo() powders results in Mo and Si nanocrystallites in micrometric particles. It was demonstrated that a pure α-MoSi2 with nanometric structure (DMoSi2 = 88nm) could be produced via a very fast combustion front in contrast with the classical SHS process.
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