XPS and AES surface characterization of WC-Co after electro-discharge machining

The surface of tungsten carbide with Co‐binder (WC–Co) after wire electro‐discharge machining (W‐EDM) with and without induced discolouration was investigated by XPS, AES and SEM. The measurements show that the eroded surface is at least partly covered by a layer containing Zn and Cu oxides, and als...

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Bibliographic Details
Published in:Surface and interface analysis 2004-08, Vol.36 (8), p.777-779
Main Authors: Stössel-Sittig, C., Schnyder, B., Kötz, R.
Format: Article
Language:English
Subjects:
AES
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
corrosion
Cross-disciplinary physics: materials science
rheology
electro-discharge machining
Exact sciences and technology
Physics
tungsten carbide with Co-binder
XPS
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Summary:The surface of tungsten carbide with Co‐binder (WC–Co) after wire electro‐discharge machining (W‐EDM) with and without induced discolouration was investigated by XPS, AES and SEM. The measurements show that the eroded surface is at least partly covered by a layer containing Zn and Cu oxides, and also small amounts of W and Co. The Zn and Cu originate from the wire (brass wire covered with Zn) used during the W‐EDM and/or from the water, which contains Zn, Cu, W and Co from W‐EDM processes performed earlier on the same machine. The W and Co stem from the water or from the base material of the work piece. On the samples with induced discolouration a dark pattern is visible at the surface. Measurements on these samples show an increased amount of Co within the dark pattern. Copyright © 2004 John Wiley & Sons, Ltd.
ISSN:0142-2421
1096-9918
DOI:10.1002/sia.1762