1. Basic principle of a heterogeneous gas-solid reaction
1.1 Physico-chemical mechanisms of carbon transfer by a heterogeneous gas-solid reaction
A heterogeneous gas-solid reaction is one involving the transfer of matter between these two phases. Generally speaking, the overall mechanism can be broken down into three main stages:
transport of gas-phase reactive species to the steel surface;
the physico-chemical reaction on the steel surface ;
transport in the solid state by diffusion of atoms produced by the chemical reaction.
To illustrate our point, the reactive species will be a gaseous molecule containing carbon atoms, carried in a gaseous mixture, i.e. a molecule of the type C...
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Basic principle of a heterogeneous gas-solid reaction
Carbon monoxide- and hydrocarbon-based atmospheres
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