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A Novel Approach of Plasma Nitrocarburizing Using a Solid Carbon Active Screen – a Proof of Concept

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Published/Copyright: October 17, 2017
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HTM Journal of Heat Treatment and Materials
From the journal HTM Journal of Heat Treatment and Materials Volume 72 Issue 5

Abstract

The feasibility of a novel approach of plasma nitrocarburizing with active screen (AS) made of carbon-fiber reinforced carbon (CFC) has been demonstrated in a comparative study of two types of AS material, steel and CFC, under similar process conditions. Besides the excellent thermo-mechanical properties of the CFC material against the conventional steel, an uncontrollable sputter deposition of the steel screen material during the nitriding can be avoided by the use of the CFC material. Furthermore, a solid-carbon-source concept based on the generation of highly reactive precursor gases, in particular of the unsaturated hydrocarbons HCN and C2H2 directly in the process, avoiding external supply of gaseous hydrocarbons, has been realized in the plasma-enhanced thermochemical treatment. The high nitriding effect of the process atmosphere obtained with the CFC AS yielded a significant improvement of nitriding results for different treated steels.

Kurzfassung

Die Machbarkeit eines neuartigen Ansatzes zum Plasmanitrocarburieren mit dem Aktivgitter aus kohlenstofffaserverstärktem Kohlenstoff (carbon fiber carbon composite, CFC) wurde im Rahmen einer Vergleichsstudie unter identischen Versuchsbedingungen für ein Aktivgitter aus Stahl bzw. CFC geprüft. Neben den hervorragenden thermo-mechanischen Eigenschaften des CFC im Vergleich zum konventionellen Stahl wird beim CFC-Aktivgitter eine unkontrollierte Zerstäubung und Abscheidung des Gittermaterials auf den behandelten Proben vermieden. Darüber hinaus wurde für das plasmagestützte thermochemische Verfahren das Konzept einer Feststoff-Kohlenstoffquelle umgesetzt, welches auf der Erzeugung hochreaktiver Gase, insbesondere der ungesättigten Verbindungen HCN und C2H2, direkt während des Prozesses beruht und damit die Verwendung externer gasförmiger Kohlenstoff-Präkursoren nicht erforderlich macht. Infolge der hochreaktiven Nitrieratmosphäre, die mittels des CFC-Aktivgitters erzeugt wurde, konnten signifikante Verbesserungen des Nitrierergebnisses bei der Behandlung unterschiedlicher Stähle erreicht werden.

Keywords: active screen plasma nitrocarburizing; afterglow; solid-carbon-source; carbon-fiber reinforced carbon (CFC); chemical sputtering; compound layer (CL); nitriding hardness depth (NHD)
Schlüsselwörter: Aktivgitter-Plasmanitrocarburieren; Nachglimmen (afterglow); Feststoff-Kohlenstoffquelle; kohlenstofffaserverstärkter Kohlenstoff (CFC); chemisches Sputtern; Verbindungsschicht (VS); Nitrierhärtetiefe (NHD)
4 (Corresponding author/Kontakt)

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Published Online: 2017-10-17
Published in Print: 2017-10-12

© 2017, Carl Hanser Verlag, München

Articles in the same Issue

  1. Fachbeiträge/Technical Contributions
  2. AWT-Seminare 2018
  3. HTM-Praxis
  4. HTM-Praxis
  5. Kurzfassungen/Abstracts
  6. Kurzfassungen
  7. Inhalt/Contents
  8. Inhalt
  9. Fachbeiträge/Technical Contributions
  10. CarboBain: Case Hardening by Carbo-Austempering–a short Introduction to Transformation Kinetics, Microstructure and Residual Stresses*
  11. A Novel Approach of Plasma Nitrocarburizing Using a Solid Carbon Active Screen – a Proof of Concept
  12. Fixturhärten ohne Abschrecköl
  13. Virtual Optimization of Process and Material Properties for ADI*
  14. Schleifbarkeit mehrphasiger, einsatzgehärteter Zahnräder mit erhöhtem Restaustenitgehalt
  15. Die Wirkmechanismen mikrobiell basierter Kühlschmierstoffe
  16. Optimization of Current, Voltage and Powder Feed Rate on Mechanical Properties of Plasma Transferred Arc Welded SS 316 Joints
https://doi.org/10.3139/105.110334
Keywords for this article
active screen plasma nitrocarburizing; afterglow; solid-carbon-source; carbon-fiber reinforced carbon (CFC); chemical sputtering; compound layer (CL); nitriding hardness depth (NHD)

Articles in the same Issue

  1. Fachbeiträge/Technical Contributions
  2. AWT-Seminare 2018
  3. HTM-Praxis
  4. HTM-Praxis
  5. Kurzfassungen/Abstracts
  6. Kurzfassungen
  7. Inhalt/Contents
  8. Inhalt
  9. Fachbeiträge/Technical Contributions
  10. CarboBain: Case Hardening by Carbo-Austempering–a short Introduction to Transformation Kinetics, Microstructure and Residual Stresses*
  11. A Novel Approach of Plasma Nitrocarburizing Using a Solid Carbon Active Screen – a Proof of Concept
  12. Fixturhärten ohne Abschrecköl
  13. Virtual Optimization of Process and Material Properties for ADI*
  14. Schleifbarkeit mehrphasiger, einsatzgehärteter Zahnräder mit erhöhtem Restaustenitgehalt
  15. Die Wirkmechanismen mikrobiell basierter Kühlschmierstoffe
  16. Optimization of Current, Voltage and Powder Feed Rate on Mechanical Properties of Plasma Transferred Arc Welded SS 316 Joints
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