Growth Kinetics of Fe Boride Layers: Application of a Diffusion Model
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.
Andreas Öchsner and Graeme E. Murch
M. Keddam "Growth Kinetics of Fe Boride Layers: Application of a Diffusion Model", Defect and Diffusion Forum, Vols. 273-276, pp. 318-322, 2008