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Title: Plasma nitriding monitoring reactor: A model reactor for studying plasma nitriding processes using an active screen

A laboratory scale plasma nitriding monitoring reactor (PLANIMOR) has been designed to study the basics of active screen plasma nitriding (ASPN) processes. PLANIMOR consists of a tube reactor vessel, made of borosilicate glass, enabling optical emission spectroscopy (OES) and infrared absorption spectroscopy. The linear setup of the electrode system of the reactor has the advantages to apply the diagnostic approaches on each part of the plasma process, separately. Furthermore, possible changes of the electrical field and of the heat generation, as they could appear in down-scaled cylindrical ASPN reactors, are avoided. PLANIMOR has been used for the nitriding of steel samples, achieving similar results as in an industrial scale ASPN reactor. A compact spectrometer using an external cavity quantum cascade laser combined with an optical multi-pass cell has been applied for the detection of molecular reaction products. This allowed the determination of the concentrations of four stable molecular species (CH{sub 4}, C{sub 2}H{sub 2}, HCN, and NH{sub 3}). With the help of OES, the rotational temperature of the screen plasma could be determined.
Authors:
;  [1] ; ; ;  [2] ; ;  [3]
  1. INP-Greifswald, Felix-Hausdorff-Str. 2, 17489 Greifswald (Germany)
  2. TU Bergakademie Freiberg, Institute of Materials Engineering, Gustav-Zeuner-Str. 5, 09599 Freiberg (Germany)
  3. ELTRO GmbH, Arnold-Sommerfeld-Ring 3, 52499 Baesweiler (Germany)
Publication Date:
OSTI Identifier:
22482641
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ABSORPTION SPECTROSCOPY; AMMONIA; BOROSILICATE GLASS; CYLINDRICAL CONFIGURATION; ELECTRIC FIELDS; EMISSION SPECTROSCOPY; METHANE; MONITORING; PLASMA; REACTOR VESSELS; SPECTROMETERS; STEELS