Abstract
The activation of self-propagating combustion reactions in the Nb-Si system was investigated using an electric field. Self-sustaining combustion in elemental reactants with compositions corresponding to Nb 5Si 3 can be initiated only when the imposed field is above a threshold value of 7.4 V cm −1. The mode of wave propogation and the nature of the product depended on the magnitude of the field. Under steady-state wave propagation, the product contained the high temperature (β) and low temperature (α) modifications of Nb 5Si 3. The relative concentration of these phases showed a dependence on the applied field and on the relative density of the reactant compacts. The effect of Nb particle size on the synthesis of Nb 5Si 3 was investigated and the feasibility of the synthesis of Nb/silicide composites was demonstrated.
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