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Effect of tungsten carbide grain size in jet electrochemical machining

Einfluß der Wolfram-Karbid-Korngröße bei der Bearbeitung mit geschlossenem elektrolytischen Freistrahl
: Schubert, Andreas; Martin, Andre; Meichsner, Gunnar

Zybura-Skrabalak, Maria ; Institute of Advanced Manufacturing Technology, Krakow:
8th International Symposium on Electrochemical Machining Technology, INSECT 2012. Proceedings : Organised in Krakow on 18th - 19th October 2012
Kraków, 2012
ISBN: 978-83-931339-5-6
International Symposium on Electrochemical Machining Technology (INSECT) <8, 2012, Krakow>
Fraunhofer IWU ()
Jet Electrochemical Machining; JET-ECM; carbide metals; tungsten carbide

Electrochemical machining (ECM) of carbide metals, e.g. tungsten carbide, is highly challenging compared to ECM of metals, because these materials are composites of covalently bound carbides embedded in a metallic binder matrix. In the ECM process dissolving and passivating effects occur simultaneously and dissimilarly. Nora Schubert et al. Investigated a mixed electrolyte consisting of aqueous solutions of sodium nitrate (1.2 mol/l) and sodium hydroxide (0.6 mol/l), which is suitable for electrochemical shaping of tungsten carbide with cobalt binder [1]. In this study Jet Electrochemical Machining (Jet-ECM) of three different tungsten carbide alloys applying the mentioned mixed electrolyte is presented. The metallic binder of the hard metals is cobalt at a ratio of 6 %. The investigated materials differ with regard to the size of the carbide grains. Machining experiments in Jet-EC milling were accomplished to investigate the influence of the applied voltage as well as and the milling speed on the eroded structures. Therefore, the geometrical dimensions removal width and removal depth were detected and the surface finishes of the milled grooves were measured, each by confocal microscopy.