Growth Kinetics of Fe Boride Layers: Application of a Diffusion Model

摘要

In the present work, a kinetic study based on a diffusion model was performed by use of both kinetics and thermodynamic data as input parameters, it was possible to evaluate the kinetic constant at each phase interface for a biphase configuration FeB and Fe2B grown over the surfaces of Armco Fe and Fe-Cr binary alloys at 0,5 and 4wt. %Cr by powder- pack boriding The simulated values of the kinetics constants by the model were compared to those found in the literature and a good agreement was observed- For the Fe-4wt. %Cr alloy, it was found by simulation that the layer thickness ratio between the FeB and Fe2B phases is very sensitive to the increase of temperature and surface boron content.