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Title: The Influence of H Content on the Properties of a-C(W):H Coatings
Authors: Evaristo, Manuel 
Fernandes, Filipe 
Jeynes, Chris
Cavaleiro, Albano 
Keywords: DLC coatings; metal doped; hydrogen content; Raman spectroscopy; mechanical properties; ERD; film density
Issue Date: 2023
Publisher: MDPI
Project: UIDB/ 00285/2020 
European Community under the program «Support of Public and Industrial Research Using Ion Beam Technology (SPIRIT)» (EC contract no. 227012) 
Serial title, monograph or event: Coatings
Volume: 13
Issue: 1
Abstract: Diamond-like-carbon “DLC” coatings can be deposited in many different ways, giving a large range of material properties suitable for many different types of applications. Hydrogen content significantly influences the mechanical properties and the tribological behavior of DLC coatings, but its determination requires techniques that are not available in many research centers. Thus, it is important to find alternative indirect techniques, such as Raman spectroscopy or nanoindentation (hardness measurements), which can give comparative and indicative values of the H contents in the coatings, particularly when depositions with a reactive gas flow are being studied. In this work, “DLC” composite coatings with varying H content were deposited via Physical Vapor Deposition (PVD) magnetron sputtering in a reactive atmosphere (Ar + CH4). An Ion Beam Analysis was used to determine the elemental depth profile across the coating thickness (giving both average C:W:H ratios and film density when combined with profilometer measurements of film thickness). The hardness was evaluated with nanoindentation, and a decrease from 16 to 6 GPa (and a decrease in the film density by a factor of two) with an increasing CH4 flow was observed. Then, the hardness and Raman results were correlated with the H content in the coatings, showing that these indirect methods can be used to find if there are variations in the H content with the increase in the CH4 flow. Finally, the adhesion and tribological performance of the coatings were evaluated. No significant differences were found in the adhesion as a function of the H content. The tribological properties presented a slight improving trend with the increase in the H content with a decrease in the wear rate and friction.
ISSN: 2079-6412
DOI: 10.3390/coatings13010092
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais
FCTUC Eng.Mecânica - Artigos em Revistas Internacionais

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