A multilayer innovative solution to improve the adhesion of nanocrystalline diamond coatings

•Improvement of the NCD adhesion on WC-12%Co substrates for tooling applications using a multi-interlayer additional system.•Reduction of the graphite layer thickness and continuity at the interface with the diamond.•Transmission electron microscopy study for a better understanding of the diffusion...

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Bibliographic Details
Published in:Applied surface science 2015-03, Vol.331, p.27-34
Main Authors: Poulon-Quintin, A., Faure, C., Teulé-Gay, L., Manaud, J.P.
Format: Article
Language:English
Subjects:
Adhesion
Chemical Sciences
Chemical vapor deposition
Coating
Cobalt
Diamond machining
Diffusion
Diffusion layers
Graphite
Interfaces
Material chemistry
Multilayers
MW-CVD
Nano crystalline diamond
Nitrides
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Summary:•Improvement of the NCD adhesion on WC-12%Co substrates for tooling applications using a multi-interlayer additional system.•Reduction of the graphite layer thickness and continuity at the interface with the diamond.•Transmission electron microscopy study for a better understanding of the diffusion phenomena occurring at the interfaces. Nano-crystalline diamond (NCD) films grown under negative biased substrates by chemical vapor deposition (CVD) are widely used as surface overlay coating onto cermet WC-Co cutting tools to get better performances. To improve the diamond adhesion to the cermet substrate, suitable multi-layer systems have been added. They are composed of a cobalt diffusion barrier close to the substrate (single and sequenced nitrides layers) coated with a nucleation extra layer to improve the nucleus density of diamond during CVD processing. For all systems, before and after diamond deposition, transmission electron microscopy (TEM) has been performed for a better understanding of the diffusion phenomena occurring at the interfaces and to evaluate the presence of graphitic species at the interface with the diamond. Innovative multilayer system dedicated to the regulation of cobalt diffusion coated with a bilayer system optimized for the carbon diffusion control, is shown as an efficient solution to significantly reduce the graphite layer formation at the interface with the diamond down to 10nm thick and to increase the adhesion of NCD diamond layer as scratch-tests confirm.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2015.01.050