Abstract
The study in-situ forms MoS2-TiO2 lubricant-hard alternate coatings with varying TiO2 sintering temperatures (400 °C/500 °C/600 °C/700 °C) on TC4 titanium alloy surfaces using the electrohydrodynamic atomization (EHDA) technique, and assesses the impact of sintering temperatures on reciprocating sliding wear of coating. The surface and interface microstructures, the interfacial bonding performance, and surface tribological properties of alternate coatings were compared with single material coatings. Results showed that MoS2-TiO2 alternate coating with TiO2 hard phase sintered at 600 °Ϲ exhibited the most effective lubrication, with a friction coefficient of ∼0.07, which reduced 42 % compared to the pure MoS2 coating. Its reciprocation wear life was 21 % shorter and the coating wear rate decreased 43.3 %. Additionally, the study analyzed the mechanism of the influence of sintering temperature on the lubrication of the alternate coatings and confirmed that the alternate TiO2 and MoS2 can effectively enhance the tribological properties compared to single material coating.
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