Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/105218
Title: On the Microstructural, Mechanical and Tribological Properties of Mo-Se-C Coatings and Their Potential for Friction Reduction against Rubber
Authors: Caessa, Jorge 
Vuchkov, Todor 
Yaqub, Talha Bin 
Cavaleiro, Albano 
Keywords: transition metal dichalcogenides; rubber tribology; magnetron sputtering; Mo-Se-C coating; solid lubricant; “chameleon” nanocomposite
Issue Date: 10-Mar-2021
Publisher: MDPI AG
Project: POCI-01-0145-FEDER-030446 
POCI-01-0247-FEDER-024521 
UIDB/00285/2020 
Serial title, monograph or event: Materials
Volume: 14
Issue: 6
Abstract: Friction and wear contribute to high energetic losses that reduce the efficiency of mechanical systems. However, carbon alloyed transition metal dichalcogenide (TMD-C) coatings possess low friction coefficients in diverse environments and can self-adapt to various sliding conditions. Hence, in this investigation, a semi-industrial magnetron sputtering device, operated in direct current mode (DC), is utilized to deposit several molybdenum-selenium-carbon (Mo-Se-C) coatings with a carbon content up to 60 atomic % (at. %). Then, the carbon content influence on the final properties of the films is analysed using several structural, mechanical and tribological characterization techniques. With an increasing carbon content in the Mo-Se-C films, lower Se/Mo ratio, porosity and roughness appeared, while the hardness and compactness increased. Pin-on-disk (POD) experiments performed in humid air disclosed that the Mo-Se-C vs. nitrile butadiene rubber (NBR) friction is higher than Mo-Se-C vs. steel friction, and the coefficient of friction (CoF) is higher at 25 °C than at 200 °C, for both steel and NBR countersurfaces. In terms of wear, the Mo-Se-C coatings with 51 at. % C showed the lowest specific wear rates of all carbon content films when sliding against steel. The study shows the potential of TMD-based coatings for friction and wear reduction sliding against rubber.
URI: https://hdl.handle.net/10316/105218
ISSN: 1996-1944
DOI: 10.3390/ma14061336
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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