THERMAL-EXPLOSION IN SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS SYSTEMS WITH ALLOWANCE FOR CHEMICAL GAS-TRANSPORT

On the basis of a model of the reaction of components, taking the chan ge in the contact surface into account, we analyze how the transport o f one component to the surface of the other affects the ignition tempe rature. We have found that chemical gas transport converts the reactio n process from ignition at the center of the space to ignition from th e reactor wall. In the reactor are two regions, delimited by a curve o f equilibrium concentrations of the carrier compound transporting the other component. The carrier compound forms and builds up in one regio n and in the other region separates out on the surface of the other. T he fact that the reactor is closed and that diffusion occurs from one region to the other make it possible to produce superequilibrium conce ntrations of the carrier compounds in the region of deposition.