Tribological Behavior of AISI52100 Steel After PC/MoS2 Lubricant Surface Modification

Bearings, as a key part of a vehicle transmission system, were extensively studied to improve their abrasion resistance and fatigue life. Mixtures of hard ceramic particles, namely, molybdenum disulphide (MoS2) and graphite particles (PC), were sprayed with a high-pressure inert gas onto the surface of AISI52100 bearing steel, forming the lubricant film. The morphology and phase composition of the protective layer were examined using confocal laser scanning microscopy, surface roughness tester, X-ray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The changes in surface microhardness were evaluated with a microhardness tester. The friction factor and anti-wear properties of the lubricant layer were assessed with an SRV-IV microvibration tester. The solid lubricant is shown to effectively reduce the friction factor. The surface modification gave a twofold increase in extreme pressure 14% reduction in the friction factor, and 20% enhancement in microhardness. This study offers a practical method to enhance the bearing surface strength for a vehicle transmission system.