Adhesion; Coating; Diamond; EBSD; Magnetic saturation; Microscopy; Coating adhesion; Diamond coating; Diffraction techniques; Layer adhesion; Microscopy technique; Pre-treatments; Systematic study; WC grain size; Ceramics and Composites; Mechanics of Materials; Mechanical Engineering; Metals and Alloys; Materials Chemistry
Abstract :
[en] Achieving a consistent and well-adhering diamond coating remains a challenge for WC-Co tools. We analyze the microstructure of tungsten carbide and cobalt using electron microscopy and diffraction techniques. We examine batches with good and poor layer adhesion at three stages: uncoated, after pretreatment, and after coating. The samples are differentiated based on their magnetic saturation value. This study focuses on WC-6 %Co with a mean WC grain size of 1.2 μm and vanadium doping. The results reveal a direct correlation between magnetic saturation and diamond coating adhesion to the substrate surface. Magnetic values represent the tungsten content and, consequently, the corrosion resistance of the binder phase (cobalt). An ignoble binder (low corrosion resistance) is prone to excessive etching and improper diamond nucleation. Batches with a noble binder show consistent coating formation, consistent diameter reduction, and consistent depletion zone depth. In contrast, batches with an ignoble binder exhibit significant changes in these areas.
Disciplines :
Materials science & engineering
Author, co-author :
ALATRASH, Anas ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE) ; Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology and Center for Electron Microscopy, Graz, Austria
Steinmüller-Nethl, D.; CarbonCompetence GmbH, Wattens, Austria
Fitzek, H.; Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology and Center for Electron Microscopy, Graz, Austria
Mitsche, S.; Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology and Center for Electron Microscopy, Graz, Austria
Knez, D.; Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology and Center for Electron Microscopy, Graz, Austria
Oberaigner, M.; Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology and Center for Electron Microscopy, Graz, Austria
Arnold, J.; CarbonCompetence GmbH, Wattens, Austria
Österreichische Forschungsförderungsgesellschaft Austrian Research Foundation
Funding text :
This project has received funding from the Austrian Research Promotion Agency (FFG) (project \u201CQualiTool\u201D, number 39177565 ). The funding agency took no role in the research.We thank Martina Dienstleder, Anita Rossmann-Perner, Arnela Bla\u017Eevi\u0107 and Emma Kramer for their assistance in sample preparation. This project has received funding from the Austrian Research Promotion Agency (FFG) (project \u201CQualiTool\u201D, number 39177565).
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