Abstract
In this research paper, mechanical and tribological characteristics of novel MoS2-CaF2-Ag composite coating are presented. A single layer MoS2-CaF2-Ag composite coating of ∼530 nm thickness was developed on highly polished AMS 5898 bearing steel substrate using direct current (DC) and radio frequency (RF) magnetron sputtering of MoS2, CaF2 and Ag targets in an Argon plasma. The coating was studied for its coefficient of friction (COF) in normal relative humidity (RH) 60 ± 5 % and temperature ranging from room temperature (RT) to 250°C using rotary ball-on-disc tribometer. Field emission scanning electron microscopy (FESEM) with energy dispersive spectroscopy (EDS) was used to study the surface morphology and elemental mapping of the as-deposited coating and also for in-situ examination of the wear tracks. The developed coating demonstrated good hardness, dense microstructure and low COF (0.03–0.06). Minimum wear rate of 1.97 × 10−5 (mm3/Nm) was observed at 150 °C. Blister wear, brittle cracking, spallation and delamination was observed at RT and 50 °C and combination of abrasive, adhesive and oxidative wear at 100 °C to 250 °C. The MoS2-CaF2-Ag composite coating proved efficient in reducing COF and wear under ambient atmospheric conditions, making it highly suitable for solid lubrication of tribo systems in space applications.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
