Evolution of tribologically induced chemical and structural degradation in hydrogenated a-C coatings

The coatings with gradually varying chemical composition and structure were obtained by PECVD method from methane precursor and various admixtures of Ar. The composition of emitted gases and triboemission behaviour were studied for these coatings and correlated with the coating properties and deposi...

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Bibliographic Details
Published in:Tribology international 2019-01, Vol.129, p.177-190
Main Authors: Nevshupa, Roman, Caro, Jaume, Arratibel, Alba, Bonet, Raül, Rusanov, Anton, Ares, Jose Ramon, Roman, Elisa
Format: Article
Language:English
Subjects:
Admixtures
Alkanes
Ceramic glazes
Chemical composition
Chemical vapor deposition
Coatings
Correlation analysis
Degradation
Engineering Sciences
Fatty acids
Hydrogenated amorphous carbon
Hydrogenation
Lipids
Mass-spectrometry
Oils & fats
Organic chemistry
Tribochemistry
Triboemission
Tribology
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Summary:The coatings with gradually varying chemical composition and structure were obtained by PECVD method from methane precursor and various admixtures of Ar. The composition of emitted gases and triboemission behaviour were studied for these coatings and correlated with the coating properties and deposition conditions. A new analytical approach was developed that allowed identification of the emitted gas species with much higher accuracy than conventional techniques. For the first time, triboemission of alkanes higher than propane was observed. By the application of kinetic model to the analysis of triboemission time series, chemical and structural degradation in carbon coatings could be traced in course of tribological tests. •The triboemission rate of hydrocarbons increased with the increase of H and terminal methyl group concentrations.•The CO and CO2 emission rates increased with the increase of Ar/methane ratio in the precursor gases.•Hydrocarbons triboemission correlates with chemical transformations in carbon coatings.•Ar and hydrogen triboemission can be used to track mechanical damage of the coating and the substrate.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2018.08.023