Influence of external magnetic fields on the coatings of a cascaded plasma generator

21st Chemnitz Seminar on Materials Engineering – 21. Werkstofftechnisches Kolloquium

Bobzin, K.^1 ; Öte, M.^1 ; Knoch, M.A.^1 ; Heinemann, H.^1 ; Zimmermann, S.^2 ; Schein, J.^2

RWTH Aachen University, Surface Engineering Institute, Germany^1

University of Federal Forces Germany, Lab for Plasma Technology and Mathematics, Munich, Germany^2

关键词: Attachment points;    Coating properties;    External magnetic field;    Height profiles;    Measurements of;    Operating parameters;    Plasma generator;    Process parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/480/1/012004/pdf
DOI  :  10.1088/1757-899X/480/1/012004

来源: IOP

【 摘 要 】

Cascaded single cathode single anode plasma generators represent a novel design in plasma spraying. They promise to combine the advantages of cascaded plasma generators, e.g. a higher plasma enthalpy and stability, with the simple design of the well-established non-cascaded single cathode single anode generators. In this paper, the electric arc of such a cascaded plasma torch (SinplexPro™-90, Oerlikon Metco) is manipulated by magnets mounted on the torch casing with the aim of moving the anodic attachment point. To analyze the effect on the coating properties, alumina (Amdry™ 6062) coatings are deposited using two operating parameters and two magnets of different remanences. The resulting coatings and their porosity, microhardness as well as phase composition are presented. Furthermore, measurements of the height profile of the spray spot, exhibiting an asymmetric shape, are shown. Consequently, the influence of the different process parameters and applied external magnetic fields on the coating properties is discussed.