Research on Tribological Properties and Synergistic Lubrication Mechanism of TC4-SnAgCu Composites with Face-Centered Cubic Lattice Structure

In order to meet the requirements of high-end equipment for lightweight, low-friction and high durability, and to solve the problems of adhesion wear and high friction coefficient of TC4 material, this study prepared TC4-based FCC-SnAgCu composite specimens (FCC-SAC) through selective laser melting (SLM) and vacuum pressure fusion infiltration. The friction characteristics of the samples and the synergistic lubrication mechanism were investigated under different loads. The results showed that under dry friction conditions, the friction coefficient of the composite specimens was reduced by approximately 50% compared to TC4, and the wear volume was reduced by 50-75%. Under lubricating grease lubrication conditions, the friction coefficient of the FCC-SAC composite specimens was stable at 0.11-0.13, and the wear rate was significantly reduced. The friction mechanism analysis revealed that the FCC structure could store lubricating grease in pores and gradually release SnAgCu solid lubricants to form a stable lubricating film, while the multi-node topological structure could uniformly disperse stress and inhibit adhesion wear and abrasive wear. This study provides a basis for the design of lightweight self-lubricating titanium alloy materials.