For improving the tribological performance, the textured composite solid lubricant coating was prepared on the surface of Ti–6Al–4V (TC4). The effects of composite coating with different texture densities on the tribological properties of TC4 were studied. The results show that the coating improves the microhardness of TC4 surface, and appropriate texture density effectively suppresses the stress of contact interface so that the average friction coefficient of TC4-based composite solid lubricant coating with 25% wavy texture density sample (TCWs-SW25) is 50.24% lower than that of TC4, and the average wear loss is reduced by 97.66%. The enhancement of contact interface performance comes from the transfer effect of lubricants to reduce the number of interfacial asperities, thereby improves the friction and wear properties and inhibits vibration and noise of TC4.

Wind power gears will be excessively worn due to lubrication failure during operation. Herein, the tribological properties of rubbing pairs are improved by filling solid lubricants into surface texture. In texture design, three types of topological textures (Circle (C), Hexagon (H), and Circle/Hexagon (CH)) were obtained by cell topology optimization, and then three cases with 20%, 30%, and 40% density were designed for each texture. Next, SnAgCu and TiC were deposited in texture of AISI 4140 steel (AS) to obtain 9 kinds of self-lubricating surfaces. Among them, AS with 30% CH density (AS-CH30) exhibits excellent mechanical and tribological properties. Compared with AS-C and AS-H, the maximum equivalent stress of AS-CH was decreased by 10.86% and 5.37%, respectively. Friction coefficient and wear rate of AS-CH30 were 79.68% and 78% lower than those of AS. The excellent tribological performances of AS-CH30 can be attributed to the synergistic effect of topological surface and solid lubricants. Topological surface can not only reduce fluctuation of equivalent stress, but also promote the stored lubricants to be easily transferred at the contact interface to form a 200 nm lubricating film containing solid lubricants (mainly), oxides and wear debris.