Abstract
A thermodynamic approach based on the minimization of the Gibbs free energy enabled a study to be made of the complete multicomponent gas-solid system, including solid solutions, involved in the pack cementation process. Compositions of the gas phase in equilibrium with various packs are calculated as functions of the metal activities in the binary alloys AlCr, AlNi and AlFe. The possibility of co-transport of other metals with aluminium is deduced. Compositions of the gas phase in equilibrium at the surface of the sample, which change through deposition of the coating element, are calculated. From the composition differences in the gas phase in equilibrium with the source alloy and the substrate, the aluminizing mechanism is deduced. The coating composition calculated at equilibrium enables the coating capabilities of various packs to be deduced.
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