Influence of Oxygen Admixture on Plasma Nitrocarburizing Process and Monitoring of an Active Screen Plasma Treatment

The effect of a controlled oxygen admixture to a plasma nitrocarburizing process using active screen technology and an active screen made of carbon was investigated to control the carburizing potential within the plasma-assisted process. Laser absorption spectroscopy was used to determine the result...

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Autores principales:	Jan Böcker, Anke Dalke, Alexander Puth, Christian Schimpf, Jürgen Röpcke, Jean-Pierre H. van Helden, Horst Biermann
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	active screen technology plasma nitrocarburizing process monitoring gas diagnostics laser absorption spectroscopy compound layer Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/699bf55818fa43778266e4a0b4fead19
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spelling	oai:doaj.org-article:699bf55818fa43778266e4a0b4fead192021-11-11T15:00:53ZInfluence of Oxygen Admixture on Plasma Nitrocarburizing Process and Monitoring of an Active Screen Plasma Treatment10.3390/app112199182076-3417https://doaj.org/article/699bf55818fa43778266e4a0b4fead192021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/9918https://doaj.org/toc/2076-3417The effect of a controlled oxygen admixture to a plasma nitrocarburizing process using active screen technology and an active screen made of carbon was investigated to control the carburizing potential within the plasma-assisted process. Laser absorption spectroscopy was used to determine the resulting process gas composition at different levels of oxygen admixture using O<sub>2</sub> and CO<sub>2</sub>, respectively, as well as the long-term trends of the concentration of major reaction products over the duration of a material treatment of ARMCO<sup>®</sup> iron. The short-term studies of the resulting process gas composition, as a function of oxygen addition to the process feed gases N<sub>2</sub> and H<sub>2,</sub> showed that a stepwise increase in oxygen addition led to the formation of oxygen-containing species, such as CO, CO<sub>2</sub>, and H<sub>2</sub>O, and to a significant decrease in the concentrations of hydrocarbons and HCN. Despite increased oxygen concentration within the process gas, no oxygen enrichment was observed in the compound layer of ARMCO<sup>®</sup> iron; however, the diffusion depth of nitrogen and carbon increased significantly. Increasing the local nitrogen concentration changed the stoichiometry of the ε-Fe<sub>3</sub>(N,C)<sub>1+x</sub> phase in the compound layer and opens up additional degrees of freedom for improved process control.Jan BöckerAnke DalkeAlexander PuthChristian SchimpfJürgen RöpckeJean-Pierre H. van HeldenHorst BiermannMDPI AGarticleactive screen technologyplasma nitrocarburizingprocess monitoringgas diagnosticslaser absorption spectroscopycompound layerTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 9918, p 9918 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	active screen technology plasma nitrocarburizing process monitoring gas diagnostics laser absorption spectroscopy compound layer Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	active screen technology plasma nitrocarburizing process monitoring gas diagnostics laser absorption spectroscopy compound layer Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Jan Böcker Anke Dalke Alexander Puth Christian Schimpf Jürgen Röpcke Jean-Pierre H. van Helden Horst Biermann Influence of Oxygen Admixture on Plasma Nitrocarburizing Process and Monitoring of an Active Screen Plasma Treatment
description	The effect of a controlled oxygen admixture to a plasma nitrocarburizing process using active screen technology and an active screen made of carbon was investigated to control the carburizing potential within the plasma-assisted process. Laser absorption spectroscopy was used to determine the resulting process gas composition at different levels of oxygen admixture using O<sub>2</sub> and CO<sub>2</sub>, respectively, as well as the long-term trends of the concentration of major reaction products over the duration of a material treatment of ARMCO<sup>®</sup> iron. The short-term studies of the resulting process gas composition, as a function of oxygen addition to the process feed gases N<sub>2</sub> and H<sub>2,</sub> showed that a stepwise increase in oxygen addition led to the formation of oxygen-containing species, such as CO, CO<sub>2</sub>, and H<sub>2</sub>O, and to a significant decrease in the concentrations of hydrocarbons and HCN. Despite increased oxygen concentration within the process gas, no oxygen enrichment was observed in the compound layer of ARMCO<sup>®</sup> iron; however, the diffusion depth of nitrogen and carbon increased significantly. Increasing the local nitrogen concentration changed the stoichiometry of the ε-Fe<sub>3</sub>(N,C)<sub>1+x</sub> phase in the compound layer and opens up additional degrees of freedom for improved process control.
format	article
author	Jan Böcker Anke Dalke Alexander Puth Christian Schimpf Jürgen Röpcke Jean-Pierre H. van Helden Horst Biermann
author_facet	Jan Böcker Anke Dalke Alexander Puth Christian Schimpf Jürgen Röpcke Jean-Pierre H. van Helden Horst Biermann
author_sort	Jan Böcker
title	Influence of Oxygen Admixture on Plasma Nitrocarburizing Process and Monitoring of an Active Screen Plasma Treatment
title_short	Influence of Oxygen Admixture on Plasma Nitrocarburizing Process and Monitoring of an Active Screen Plasma Treatment
title_full	Influence of Oxygen Admixture on Plasma Nitrocarburizing Process and Monitoring of an Active Screen Plasma Treatment
title_fullStr	Influence of Oxygen Admixture on Plasma Nitrocarburizing Process and Monitoring of an Active Screen Plasma Treatment
title_full_unstemmed	Influence of Oxygen Admixture on Plasma Nitrocarburizing Process and Monitoring of an Active Screen Plasma Treatment
title_sort	influence of oxygen admixture on plasma nitrocarburizing process and monitoring of an active screen plasma treatment
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/699bf55818fa43778266e4a0b4fead19
work_keys_str_mv	AT janbocker influenceofoxygenadmixtureonplasmanitrocarburizingprocessandmonitoringofanactivescreenplasmatreatment AT ankedalke influenceofoxygenadmixtureonplasmanitrocarburizingprocessandmonitoringofanactivescreenplasmatreatment AT alexanderputh influenceofoxygenadmixtureonplasmanitrocarburizingprocessandmonitoringofanactivescreenplasmatreatment AT christianschimpf influenceofoxygenadmixtureonplasmanitrocarburizingprocessandmonitoringofanactivescreenplasmatreatment AT jurgenropcke influenceofoxygenadmixtureonplasmanitrocarburizingprocessandmonitoringofanactivescreenplasmatreatment AT jeanpierrehvanhelden influenceofoxygenadmixtureonplasmanitrocarburizingprocessandmonitoringofanactivescreenplasmatreatment AT horstbiermann influenceofoxygenadmixtureonplasmanitrocarburizingprocessandmonitoringofanactivescreenplasmatreatment
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Influence of Oxygen Admixture on Plasma Nitrocarburizing Process and Monitoring of an Active Screen Plasma Treatment

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