Abstract

To enhance the service life and operational precision of Ti-based aerospace gears, sinusoidal closed-cycle structures containing S (SnCuAg), G (Graphene), A (Al2O3), SG, SA and SGA are fabricated using laser additive manufacturing and high-temperature infiltration. The results reveal that SGA lubricants ensure superior synergistic lubrication. During the wear process, a substantial amount of SGA lubricants continuously exude from the sinusoidal closed structures and migrate to the contact wear interfaces, subsequently accumulating into a well-distributed lubrication film. The lubricants, S, G, A, undergo good plastic deformation, interlayer delamination and rolling friction, respectively. Hence, synergistic lubrication emerges among SG, SA, and SGA. This synergistic effect protects the wear surface and suppresses sliding-induced damage, markedly reducing the sliding resistance of mating pairs, thereby improving the anti-friction and anti-wear abilities of the film. Ultimately, Ti-SGA shows outstanding tribological behavior, achieving a friction coefficient of approximately 0.26 and a wear rate of approximately 2.73 × 10−4 mm3N−1m−1.

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