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Indexed by:Journal Papers
Date of Publication:2015-12-25
Journal:SURFACE & COATINGS TECHNOLOGY
Included Journals:SCIE、EI、Scopus
Volume:284
Page Number:133-138
ISSN No.:0257-8972
Key Words:Diamond coating; Chemical vapor deposition; Cu-W composite; Adhesion
Abstract:In this study, two Cu-W (Cu30-W, Cu40-W) and one Cu50-WC composites (all in wt.%) were synthesized by powder metallurgy and used as substrates for diamond coating in a microwave plasma enhanced chemical vapor deposition reactor. Optical microscopy, scanning electron microscopy, Raman spectroscopy, X-ray diffraction, indentation test and synchrotron-based high resolution X-ray near edge absorption spectroscopy were used to investigate the morphology, composition, microstructures and adhesion of diamond films. The results show that the adhesion of diamond coatings formed on these Cu-W alloy substrates is much higher than on pure Cu substrate. The adhesion improvement is primarily attributed to the reduced mismatch in the thermal expansion coefficients, and the formation of WC phase on the sub-surface of the substrate that strengthens the coating-substrate interfacial bonding. (C) 2015 Elsevier B.V. All rights reserved.
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