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Journal of Materials Science

, Volume 44, Issue 3, pp 770–777 | Cite as

Growth of massive cementite layers; thermodynamic parameters and kinetics

  • Marc Nikolussi
  • Andreas LeineweberEmail author
  • Eric Jan Mittemeijer
Article

Abstract

Massive, pure cementite layers were grown on ferrite substrates by nitrocarburising in a dedicated NH3/H2/CO/N2 containing gas atmosphere at temperatures in the range of 783–843 K. From the parabolic layer-growth constants, an “apparent” activation energy for cementite-layer growth of 109 ± 12 kJ/mol was obtained. This “apparent” activation energy can be subdivided into a positive contribution due to the activation energy for (tracer) diffusion of carbon in cementite and a negative contribution due to the temperature dependence of the difference of the carbon activity in cementite at the surface and at the interface cementite/ferrite.

Keywords

Carbon Activity Cementite Compound Layer Iron Nitride Heterogeneous Water 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2008

Open AccessThis is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://doi.org/creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  • Marc Nikolussi
    • 1
  • Andreas Leineweber
    • 1
    Email author
  • Eric Jan Mittemeijer
    • 1
  1. 1.Max Planck Institute for Metals ResearchStuttgartGermany

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