Analytical methods to characterize heterogeneous raw material for thermal spray process: cored wire Inconel 625

18th Chemnitz Seminar on Materials Engineering – 18. Werkstofftechnisches Kolloquium

Lindner, T.^1 ; Bonebeau, S.^2 ; Drehmann, R.^1 ; Grund, T.^1 ; Pawlowski, L.^2 ; Lampke, T.^1

Materials and Surface Engineering Group, Institute of Materials Science and Engineering, Technische Universität Chemnitz, Chemnitz

09125, Germany^1

Faculty of Science and Technology, University of Limoges, France^2

关键词: Arc spray;    Chemical and phase compositions;    Cored wires;    Energy dispersive X ray spectroscopy;    Inconel 625;    Manufacturer specifications;    Thermally sprayed coatings;    X ray fluorescence analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/118/1/012009/pdf
DOI  :  10.1088/1757-899X/118/1/012009

来源: IOP

【 摘 要 】

In wire arc spraying, the raw material needs to exhibit sufficient formability and ductility in order to be processed. By using an electrically conductive, metallic sheath, it is also possible to handle non-conductive and/or brittle materials such as ceramics. In comparison to massive wire, a cored wire has a heterogeneous material distribution. Due to this fact and the complex thermodynamic processes during wire arc spraying, it is very difficult to predict the resulting chemical composition in the coating with sufficient accuracy. An Inconel 625 cored wire was used to investigate this issue. In a comparative study, the analytical results of the raw material were compared to arc sprayed coatings and droplets, which were remelted in an arc furnace under argon atmosphere. Energy-dispersive X-ray spectroscopy (EDX) and X-ray fluorescence (XRF) analysis were used to determine the chemical composition. The phase determination was performed by X-ray diffraction (XRD). The results were related to the manufacturer specifications and evaluated in respect to differences in the chemical composition. The comparison between the feedstock powder, the remelted droplets and the thermally sprayed coatings allows to evaluate the influence of the processing methods on the resulting chemical and phase composition.