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A Study of the Influence of the Surrounding Gas on the Plasma Jet and Coating Quality during Plasma Spraying

Liu, Taikai and Ansar, Asif and Arnold, Johannes (2017) A Study of the Influence of the Surrounding Gas on the Plasma Jet and Coating Quality during Plasma Spraying. Plasma Chemistry and Plasma Processing, 37 (4), pp. 1009-1032. Springer. DOI: 10.1007/s11090-017-9795-9 ISBN 0272-4324 ISSN 0272-4324

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Official URL: https://link.springer.com/article/10.1007/s11090-017-9795-9?wt_mc=Internal.Event.1.SEM.ArticleAuthorOnlineFirst#citeas

Abstract

Coating quality is affected by arc and plume instabilities during plasma spraying. In closed chamber plasma spraying, gradual drift is one of the intermediate instabilities, which is mainly due to the electrode erosion. This work focuses on the source of the gradual drift of the plasma jet and the influence on coating quality. The ambient state inside the chamber was controlled by a ventilation system and a vacuum system. The variation in the plasma jet was observed by a particle flux image (PFI) device based on a CCD camera. The optical spectrum of the plasma plume was measured and analyzed through an optical spectrometer. The results indicated that the addition of hydrogen to plasma gas induced the change in the plasma jet length and width with changing rates depending on the chamber state and the ventilation power. With poor ventilation, the intensity of Hα emission was found to become gradually stronger while Hβ and Hγ were found to become weaker. On closing the chamber and remaining enough ventilation power, it was observed that the ambient gas slowly turned red. Simultaneously, the coating weight and thickness were slightly decreased meanwhile the porosity ratio was obviously increased. The red ambient gas has been proved to be able to acidify the city water with pH value decreased from 7 to 1~3. Without hydrogen, the plasma jet was found to be stable without reddening and variation, but the plasma enthalpy was unfortunately low.

Item URL in elib:https://elib.dlr.de/118243/
Document Type:Article
Title:A Study of the Influence of the Surrounding Gas on the Plasma Jet and Coating Quality during Plasma Spraying
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Liu, Taikaitaikai.liu (at) dlr.dehttps://orcid.org/0000-0001-9919-0841
Ansar, Asifasif.ansar (at) dlr.deUNSPECIFIED
Arnold, Johannesjohannes.arnold (at) dlr.deUNSPECIFIED
Date:July 2017
Journal or Publication Title:Plasma Chemistry and Plasma Processing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:37
DOI :10.1007/s11090-017-9795-9
Page Range:pp. 1009-1032
Publisher:Springer
ISSN:0272-4324
ISBN:0272-4324
Status:Published
Keywords:plasma spray; reddening phenomenon; plasma stability; emission intensity; coating quality
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrolysis and Hydrogen
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Elektrochemical Processes (Electrolysis)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Liu, Taikai
Deposited On:17 Jan 2018 13:03
Last Modified:06 Sep 2019 15:16

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