FIELD EFFECTS IN SELF-PROPAGATING SOLID-STATE SYNTHESIS REACTIONS

The use of externally imposed electric fields is shown to activate sel f-propagating solid-state reactions. Experimental observations and mod eling studies show different field effects, depending on the relative electrical conductivity of the product of the synthesis reaction. In s ystems with relatively nonconducting products the reaction wave propag ates in a steady-state mode. Examples of the influence of the field on the mechanism of solid state reactions are provided for the synthesis of tungsten silicides and AlN-SiC composites.