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Diagnostic and modeling of N2-H2 discharges for iron nitriding*

  • A. Ricard (a1), B. F. Gordiets (a2), M. J. Pinheiro (a2), C. M. Ferreira (a2), G. Baravian (a3), J. Amorim (a4), S. Bockel (a5) and H. Michel (a5)...

Abstract

The production of N and H atoms has been studied in DC and HF N2-H2 flowing discharges and post-discharges in connection with nitriding of iron substrates. Experimentally, the N and H atoms have been detected by emission spectroscopy and Laser Induced Fluorescence (LIF). A strong increase of the Mayn gas atom density (N or H) was found when a small amount of a second gas (H2 or N2) was added. This increase in N or H atom densities is interpreted by a model describing the kinetics in the reactive gas volume and on the surface of the reactor walls (pyrex tube). In particular, it is shown that the destruction probabilities of N and H atoms on the tube wall are reduced by a factor of about 2 as a few % of H2 or N2 is introduced into N2 or H2. Correlations are established between the density of N and H atoms and the thickness and quality of iron nitride layers growing on iron substrates located within a reactor and placed in the post-discharge of a N2−H2 HF flowing discharge. Under the conditions of maximum N and H atom density, thick ϵ−Fe2N1−x layers without iron oxide superficial sublayer have been found on the iron surface.

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This article is published after the COST-PISE (Plasma Ion Surface Engineering) meeting in Nancy, on September 11-12, 1997.

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* This article is published after the COST-PISE (Plasma Ion Surface Engineering) meeting in Nancy, on September 11-12, 1997.

Keywords

Diagnostic and modeling of N2-H2 discharges for iron nitriding*

  • A. Ricard (a1), B. F. Gordiets (a2), M. J. Pinheiro (a2), C. M. Ferreira (a2), G. Baravian (a3), J. Amorim (a4), S. Bockel (a5) and H. Michel (a5)...

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