Energetic characterization during plasma electrolytic polishing of cemented tungsten carbide

被引:3
|
作者
An, Sehoon [1 ]
Hansen, Luka [2 ]
Wolff, Thorben [1 ]
Foest, Ruediger [1 ]
Froehlich, Maik [3 ]
Quade, Antje [1 ]
Stankov, Marjan [1 ]
Kersten, Holger [2 ]
机构
[1] Leibniz Inst Plasma Sci & Technol INP, Felix Hausdorff Str 2, D-17489 Greifswald, Germany
[2] Univ Kiel, Inst Expt & Appl Phys, Leibnizstr 19, D-24118 Kiel, Germany
[3] Univ Appl Sci Zwickau, Leupold Inst Appl Sci, Kornmarkt 1, D-08056 Zwickau, Germany
关键词
METALS;
D O I
10.1063/5.0155581
中图分类号
O59 [应用物理学];
学科分类号
摘要
Electrical and thermal measurements were conducted during the plasma electrolytic polishing (PEP) of cemented tungsten carbide (WC-Co) materials to characterize energetic aspects of the process in relation to the temporal development of the gaseous layer near the workpiece. The power transferred to the workpiece is determined using a calorimetric probe and employing the time derivative of the temperature curve. It shows distinct heating phases due to the generation of the gaseous layer. At the beginning of the process, a typical power of 367 +/- 17W is transferred to the workpiece of a surface area of 14 cm(2). At longer process times, a stabilized gaseous layer limits the power transferred to the workpiece to 183 +/- 3W. In an attempt to describe the heat transferred to the electrolyte, the electrolyte temperature was measured using a thermocouple situated 15mm away from the workpiece. The local electrolyte temperature increases from 70 to 81 degrees C for an immersion depth of 20 mm. Moreover, the spatiotemporal development of the electrolyte temperature was obtained by 2D-hydrodynamic modeling using COMSOL Multiphysics((R)). The modeling results for the local temporal temperature development are in excellent agreement with the experimental values when the turbulent model is applied up to t = 65 s. Afterward, the laminar model leads to a better agreement. Furthermore, line scan x-ray photoelectron spectroscopy revealed that aliphatic carbon was preferentially removed. Only a slight compositional gradient in the vertical direction after the PEP process was observed.
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页数:14
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