Hannover 2020 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 12: Atmospheric-pressure plasma and applications 3

P 12.2: Vortrag

Mittwoch, 11. März 2020, 11:30–11:45, b305

Experimental Investigation of a Plasma Electrolytic Polishing Process for the Pretreatment of Cemented Carbide — •Sehoon An¹, Rüdiger Foest¹, Katja Fricke¹, Luka Hansen², Thorben Kewitz¹, Hendrik Riemer³, Maik Fröhlich⁴, Holger Kersten², and Klaus-Dieter Weltmann¹ — ¹Leibniz Institute for Plasma Science and Technology, Greifswald, Germany — ²Institute of Experimental and Applied Physics, CAU, Kiel, Germany — ³Technical University, Berlin, Germany — ⁴University of Applied Sciences, Zwickau, Germany

Plasma electrolytic polishing (PEP) has gained much attention owing to the significant improvement of surface properties within short time, but also because of its ecological benefits. We report on PEP processes for the pretreatment (cleaning) of cemented carbide, a typical material for tools. Depending on electrolyte temperature, concentration and process voltage, optimum operating conditions could be identified. Beneficial conditions for cleaning are between 100 V and 150 V for current densities in the range of 0.2 to 0.8 A/cm2. Investigations on the energy flux towards the workpiece were conducted by employing a thermocouple and monitoring the temperature. Distinct heating phases are observed and discussed in relation to different contributing factors to the total energy flux. In addition, the surface status of the cemented carbide after PEP was examined using SEM and AFM. For tribological assessment, the samples were coated with an AlTiSiN layer. Tool lifetimes comparable to conventional pre-treatment could be achieved but with less consumption of harmful chemicals.