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Diffusion of Hard Coatings on Ductile Cast Iron

Published online by Cambridge University Press:  20 December 2012

N. López Perrusquia ,
M. Antonio Doñu Ruiz ,
E. Y. Vargas Oliva  and
V. Cortez Suarez
N. López Perrusquia*
Affiliation:
Instituto Politécnico Nacional, SEPI-ESIME, U. P. Adolfo López Mateos, Zacatenco, 07738, México.
M. Antonio Doñu Ruiz
Affiliation:
Instituto Politécnico Nacional, SEPI-ESIME, U. P. Adolfo López Mateos, Zacatenco, 07738, México.
E. Y. Vargas Oliva
Affiliation:
Universidad Politécnica del Valle de México, Grupo Ciencia e Ingeniería de Materiales, 54910, Tultitlán, Estado de México
V. Cortez Suarez
Affiliation:
Universidad Autónoma Metropolitana Unidad Azcapotzalco, México.
*
*E-mail: [email protected]
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Abstract

This work estimate the growth kinetics of Fe2B coatings created on surface nodular cast iron ASTM A-536 class 80-56-06. The Fe2B coatings were formed by power packaging boriding process, considering three temperatures and exposure times different treatment. The hard coatings were evaluated through X-ray diffraction (XRD) and scanning electron microscopy (SEM). The model of diffusion employs the mass balance equation at the (Fe2B/substrate) interface to evaluate the boron diffusion coefficient in the Fe2B coating DFe2B, an expression of the parabolic growth constant, the instantaneous velocity of the Fe2B/substrate interface, and the weight gain in the boriding sample were establish as a function of the parameter ε(T) and η(T), dependents of boriding process in function of the temperature related and the time of boriding t0 (T), respectively in the Fe2B coating. Model validation was extended considering the treatment of 1273 and 1123 K for 10 h respectively, obtaining a good correlation with experimental data.

Keywords

diffusionkineticsx-ray diffraction
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1481: Symposium 2D – Structural and Chemical Characterization of Metals, Alloys and Compounds—2012 , 2012 , pp. 105 - 112
Copyright
Copyright © Materials Research Society 2012

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References

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