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Effect of Methane Addition on Formation of Plasma Nitrocarburized Layers

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Abstract

Plasma nitrocarburizing is a thermochemical process that can be used to improve the mechanical properties of metal surfaces by enriching them with carbon and nitrogen atoms. The quantity of carbon in the plasma primarily affects the formation of the microstructure of the compound layer. This article presents an investigation of the evolution of the nitrocarburized layers on an iron substrate upon addition of several different concentrations of methane in a gaseous mixture of nitrogen and hydrogen. Scanning electron microscopy and x-ray diffraction analysis were used to investigate the microstructure and phases formed in the treated samples, and optical spectroscopy was used to investigate the species formed in the plasma to understand their involvement in the formation of the layers. The results indicate that the CH+ species is involved in formation and stabilization of the ε-Fe2–3(N,C) phase.

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Acknowledgments

The authors thank the Coordination of Improvement of Higher Education Personnel (CAPES) and the National Council for Scientific and Technological Development (CNPq) for their financial support. The authors also wish to thank the LabMat/UFSC for supporting this work.

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Authors and Affiliations

  1. Joint Academic Unit of Production, Construction and Agribusiness, University of Southern Santa Catarina, Palhoça, SC, 88137-270, Brazil

    Heloisa Regina Turatti Silva & Paola Egert

  2. Engineering for Renewable Energy and Environment, Federal University of Pampa, Bagé, RS, 96400-100, Brazil

    Allan Seeber

  3. Department of Mechanical Engineering–LABMAT, Federal University of Santa Catarina, Florianópolis, SC, 88040-900, Brazil

    Carlos Speller

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  1. Heloisa Regina Turatti Silva
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  2. Paola Egert
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Correspondence to Heloisa Regina Turatti Silva or Paola Egert.

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Silva, H.R.T., Egert, P., Seeber, A. et al. Effect of Methane Addition on Formation of Plasma Nitrocarburized Layers. Metallogr. Microstruct. Anal. 5, 486–492 (2016). https://doi.org/10.1007/s13632-016-0324-7

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  • DOI: https://doi.org/10.1007/s13632-016-0324-7

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