Abstract: In order to study the modification of MoS2/C composite powder and its effect on the lubricating performance of emulsified oil, the powder was prepared and modified in situ by plasma assisted ball milling with expanded graphite and MoS2 as raw materials, oleic acid and high alkali calcium sulfonate as modifiers. The powder was characterized by scanning electron microscope, transmission electron microscope, Raman spectrum and infrared spectrometer. The results show that after 20 h of plasma assisted ball milling, under the synergistic effect of plasma thermal explosion, the expanded graphite is continuously sheared and peeled off to form a near graphene lamellar structure, part of MoS2 is refined into a flake shape of about 20 nm, and part of MoS2 splashes onto the graphite layer due to thermal explosion and forms a graphene coated spherical structure due to cold condensation. These MoS2 particles are uniformly attached to the carbon based ink lamellar layer. At the same time, during the ball milling process, the carboxyl group in oleic acid reacts with the hydroxyl group of expanded graphite and calcium sulfonate to complete the surface modification of the powder. The powder has a large degree of lipophilicity and can inhibit the oxidation of MoS2/C. The prepared modified MoS2/C was added to the emulsified oil for tribological performance test. It was found that the modified MoS2/C was deposited and adsorbed on the surface wear marks, and a layer of sulfuric acid/sulfonate chemical film was formed on the surface of the friction pair, which effectively suppressed the influence of water on the friction reduction and self-healing performance of MoS2/C and kept the emulsified oil with good lubricating performance.
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2024, Vol. 38 
