Mariana Fraga - Evaluation of the Adhesion of Ultrananocrystalline Diamond Coatings on WC-Co Substrates

Document created by Mariana Fraga on Oct 26, 2017
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    In order to improve the cutting performance and lifetime of WC-Co   hard metal tools, the issues related to synthesis and adherence   of micro- and nanocrystalline CVD diamond coatings on these tools   has been frequently discussed in the literature. However, there   are few studies focused on ultrananocrystalline diamond (UNCD)   coatings. In this study, we report the results of the   characterization of UNCD coatings with different thicknesses with   the purpose of evaluating their adhesion to WC-9%Co substrates.   The structure and morphology of the UNCD coatings as a function   of their thicknesses were investigated by Raman spectroscopy,   atomic force microscopy (AFM) and field   emission gun   scanning electron microscope (FEG-SEM) analysis. The UNCD   coating-substrate adhesion was evaluated by means of indentation   tests with a load of 1000N.

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