Abstract
Tungsten disulfide (WS2) has excellent solid lubrication properties due to its 2D layered structure. This study focuses on depositing Al-2 wt.% WS2 composite coating by cold spray technique. The effect of WS2 addition on the microstructure, mechanical and tribological properties of the composite coatings is examined in the as-deposited and heat-treated conditions. After heat treatment, the coating density increased to 99% with improved intersplat bonding. The microhardness of the heat-treated Al-2 wt.% WS2 coating increased by 56% as compared to the as-sprayed coating. The wear resistance of heat-treated Al-2 wt.% WS2 coating improved by 75% with a synergistic reduction in the coefficient of friction (COF) by 51%. Transmission electron microscopy investigation reveals the presence of layered WS2 within aluminum splats with a strong interface. This study shows that cold spraying can be effectively used to integrate 2D layered WS2 as a solid lubricant in the metallic coatings.
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Authors thank the Advanced Materials Engineering Research Institute (AMERI) at Florida International University for the characterization facilities.
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Loganathan, A., Rengifo, S., Hernandez, A.F. et al. Effect of 2D WS2 Addition on Cold-Sprayed Aluminum Coating. J Therm Spray Tech 26, 1585–1597 (2017). https://doi.org/10.1007/s11666-017-0608-8
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DOI: https://doi.org/10.1007/s11666-017-0608-8